Bob McGwier N4HY

PowerSDR 2.0 Release Candidate

2011-02-25T12:16:00.002-05:00

I have been working on some issues for PSDR 2.0. I installed PSDR 2.0 RC1 at Joel Harrison's QTH (W5ZN) and we then proceeded to play on the air on 160 meters and 80 meters. Joel and I designed a receive antenna system derived from the W8JI 8 circle.

160 meter page at W5ZN.org

I worked new countries on both bands. The noise reduction was extremely helpful even in narrow bandwidths. It is good that Eric, Neal, Steve and others at Flex debugged the control problems with the algorithm. The algorithm was, and is fine. But when you tell it to do dumb things, it gets pretty dumb. All's well that ends well. It works fine now.

Wide Band Image rejection (adaptive over signals in the IF) works as well and is on the road to major improvement as well. Again, we were shooting ourselves in the foot with external code that was doing damage to the operation of the correctly functioning algorithm.

W5ZN is ecstatic with both PSDR 2.0 and the Flex 5000 which he used to set (blow away) the W5 single band record on 80 meters in the ARRL CW DX competition.

More later....

What A Year

2011-02-24T07:10:00.003-05:00

Well, to say it has been a year since I posted does not begin to do justice to the events, the impact they have had on work, life, family, friends, and more.

In the past year we have seen the resignation of Eric Blossom as the leader of GnuRadio. This could have been a disaster for all of us. Eric is so capable. But it is clear he needed to move on for his own personal reasons to other challenges. He did.

As a result a bittersweet thing happened to me, my employer, and SDR and Cognitive Radio. In 2008, Center for Communications Research hired Thomas Rondeau, Ph.D. as a newly minted Ph.D. from Virginia Tech. Tom had been involved in GnuRadio and the SDR work being done at IDA/CCR and the Laboratory for Telecommunications Sciences for a while as a graduate student at VPI. His adviser, Charles Bostian, was a well known person in ECE communities and had been an employee of CCR's sponsor many years ago.

Tom began to have an immediate impact on my work. I was chairman of a summer long workshop at CCR for Software Defined Radio and Cognitive Radio being applied to the problems at my work. After his arrival, it was announced that Tom had won the best Ph.D. thesis for 2008 by the council of graduate schools in D.C. Tom's being hired was a real coup for IDA/CCR and all involved (I looked like a genius but mostly what I did was hoist a few beers with Tom!).

Tom Rondeau wins big award

But also in attendance at my workshop was Joe Mitola who coined the very terms we were working on for the summer in seminal papers, books, and a new Ph.D. thesis for himself. Joe is now an adjunct of CCR in Princeton and a senior executive at Stevens Institute of Technology.

Joe Mitola, Stevens superstar and friend

But by any opinion worth listening to, the most important relationship formed was with fred harris of San Diego State University. I walked up to fred at an SDR Forum meeting in Colorado and invited him to come to Princeton that summer. My life will never be the same.

fred harris, DSP super star and friend

Beginning that same summer, while my professional life at CCR was reaching its zenith, my personal life began a downward spiral. In this past year my marriage of 32 years ended. We are both okay and more kindly to each other now than we have probably ever been.

Where one door closes to an active person, others often open. My first girl friend was also divorced and still living in my home town. Her Aunt and I were in every single home room together since first grade! She told me Sharon was divorced shortly before Valentine's Day. I asked her to be my facebook friend and after a two week wait, she accepted. My legal separation became complete and she agreed to see me again. She is now my fiancé. Sharon Moore Davis, my first girl friend, will become Sharon Moore McGwier in 2011.

We had a our first date after nearly four decades in May. In September, she asked me to come and take her to Montgomery, AL to the red cross. She locked herself in a guest bed room and told me she needed privacy to work for an evening and that we would need to leave the next morning at 10 A.M.

By 3 P.M. that afternoon, she was N1SMM and I was already sure I was in love, but that did it for me. Two geeks in a pod.

On the professional front, one of several scenarios will happen in 2011. I will stay with Center for Communications Research. I will join Flex Radio Systems. I will join the faculty at Virginia Tech. I will do all three. The latter is my ideal choice.

On Software Radio, fred harris and I have several conference papers on the polyphase filter bank work we have been doing and which has been applied at the Laboratory for Telecommunications Sciences at U. Md. to projects it has run at (you guessed it) Flex Radio, and also Gnu Radio, and more. The work has resulted in tremendously capable software radios for doing Cognitive Radio work.

Laboratory for Telecommunications Sciences

I have been helping to build a deployable Cogntive Radio since last summer at Oak Ridge National Labs which is on contract to LTS for work which is supported by IDA CCR, my employer.

ORNL

I was born in Lebanon, TN. Still have family in Tennessee and I love living between Knoxville and Oak Ridge, which I will continue to do until at least June 1.

Stay tuned here for more "exciting news" in the weeks to come.

PowerSDR, PB-PAL and real diversity

2010-01-04T15:23:00.002-05:00

Today we have a fully functional synchronous receiver, truly phase synchronous phased array working in the development branch of FlexRadio's PowerSDR(tm) (Pretty Better PAL or pb-pal). This will move into the main development branch for the code soon and be released in the version 2.0 releases.

For now it is restricted to manual operation, but this will change with time.

Please visit http://www.flex-radio.com

Privacy, You, Social Networking, and Little Brother

2009-10-06T15:59:00.017-04:00

I am not often driven to words here. This is my first real post in months. This is the medium of such luminaries (and my favorites on the web and in print) Cory Doctorow , Neil Gaiman, and John Scalzi to name my three favorites. I am no competitor to them to say the least and feel that it would take more hours than I have to become good enough to not be embarrassed by my efforts held up in comparison to theirs . But on this occasion I am impelled to add my voice.

They are all influential people on the internet, in print, and in social media. @doctorow, @neilhimself, and @scalzi are all on twitter. It is how I learned more about all of them. If it was their goal to use twitter and other "social networking" tools as marketing tools (even if only partially as motivation), I view it as a success. It is completely clear to me that they "get it" and enjoy the banter on twitter.

From Scalzi: "Deleting e-mails from strangers asking for Google Wave invites."

From Doctorow: "Cydwoqs may be the coolest men's shoes on the planet, e.g., http://tinyurl.com/y9mc4vy http://tinyurl.com/yewpc6m"

and lastly from Gaiman in response to a tweet sent to him by "jolieminkbikini":

From Gaiman: "@jolieminkbikini I know. @amandapalmer always tells me to travel with snacks. And I should."

It is clear, after looking for a single day, they enjoy it. They enjoy the give and take with their fans/followers in this nearly safe environment. You get trolls but with a single click you can block them, report them as abuser, and twitter.com has NO MERCY. It works.

Witness the recent launch of Imogen Heap's new album Ellipse (which she twittered about for months as @imogenheap and allowed her followers to actively participate in the making of Ellipse). It was brilliant, cost her a few dollars, and a few hours a week. It was much better than touring through small clubs and exhausting herself. She managed to build a house, have a life, AND do the album. She agonized over every detail, but with the support of her 1,000,000+ followers. And she follows us as well, not all do. Stephen Fry does as well. Heap's Ellipse enjoyed a #5 opening on the billboard charts. Her record label did VERY little advertisement and after the fact, helped her get a spot on the Letterman Show (too bad it was before his big announcement, his ratings are through the roof).

This leads one immediately to speculation and hopes. It would be a great day indeed if these great artists can market themselves effectively with their small efficient staffs (all of these artists are showing us the way) and at the same time, deliver their offerings to us directly without the need for what is surely seen by all of them as inefficient intermediary dinosaurs. I think all of them are beginning to push the technology. Heap has allowed us to see all of her tunes without a single mention of paying to get a listen. Yet she debuts at #5 on billboard and is selling well still.

Doctorow gives away his book under an "open license". He still sells books, does tours, has a day job informing us about our web world. He is one of the most influential writers on the web. He does other neat things for activist supporters who believe his writing is important. He allows us to donate copies of his works, fiction and nonfiction, to the causes we support.

Gaiman does speaking tours everywhere and in spite of the fact that he gives away readings from his tours and promotions, his books sell like hotcakes. He wins big awards, and is beloved by his fans. He has shared his budding relationship with Amanda Palmer on twitter.

I could go on and I have started this line of argument before. The need has grown to the point that a serious effort is required to provide the new user an entry level introduction to all of this social networking and how to use it to meet your needs (and how you can allowed to invent new ways to use it).

For now, it is very important to understand that while the available tools are very exciting we must be aware of the potential loss of privacy these tools and others in our online lives subject us to. Remember the old time worn adage: "Just because you are paranoid does not mean no one is out to get you". Never has that been more true. Not all of the reasons are nefarious. Many are an attempt to provide you the end user with services tailored to your particular desires and to guess your needs. That can be good for you. It is certainly good for those who are gathering the data. So while not necessarily evil, they certainly have the potential for becoming so.

Recently I read Doctorow's novel Little Brother. I love books. I read hundreds of them a year, some not completely before I have from them what I need (technical books for my job), some non-fiction, but most by far are novels. I love the well turned phrase and the mental imagery the talented have. Doctorow has an abundance of ability and it has grown over time. His writing on the internet are well known and many rate him in their top ten list of most important writers on the internet. I could care less about ratings. What I care about is that his impact on my thinking has been profound. Nothing he has done has had more impact that this novel.

The plot line is simple. San Francisco, the town where our protagonist Marcus lives is attacked by terrorists. Ostensibly it is the omnipresent Al Qaeda. Yet it quickly evolves into a damning look at the typical overreaction by security organization and politicians. We had the terrorists a victory when we decide that the freedoms upon which we have joined the US American democratic experiment (with a little d).

I URGE all people to read this book.

Then you should go and look at the damage being done by Music, Movie, and e-book industries to your freedoms and right to due process in the US and around the world. The last trade agreement gave us the Digital Millennium Copyright Act and just stay tuned for much worse. You are about to get much much worse. In the trade agreements being supported by the Obama adminstration right now, you can forget due process. Three ACCUSATIONS of copyright infringement is all that is needed to have you banned from connecting to the "web" for an indefinite period. Just like confiscation of property without a trial, you can now sacrifice your right to access the modern world with a trial, without hearing the evidence, with seeing your accuser. Recently, the British government tried to pass laws "in the middle of the night" until the same Cory Doctorow who wrote Little Brother, raised hell in Boing Boing. The Obama administrations trade negotiator is in the same meetings that led to this law being proposed in Britain.

We CANNOT allow sacrifice of basic rights to guarantee security, to protect artists and studio and publisher rights.

Stay tuned. I have more rants to follow.

Please join EFF. This is not an organization of trouble making rabble rousing goofs. They are a group that is determined to stand in the way of this assault on YOUR freedom. They are refuse to listen to the argument (specious at best) that goes something like "I have nothing to hide and those who do, should beware". Just try this on for size when you areFALSELY ACCUSED and have no due process to protect you from the assault by the mighty.

A Contest for Geeks!

2009-06-21T11:18:00.002-04:00

Doug Grant, K1DG and Tim Duffy, K3LR, both very active contesters and members of the CQ contest committee have led the committee to make a startling change in the contest rules for CW and SSB contests this coming CQ contest season. Doug came to the SDR forum at Dayton Hamvention this year and proposed the Xtreme Class for CQ WW major contests this year.

Doug wrote to me and asked me to allow him to speak and to trust him in that it would be of interest to software defined radio types. It was. I also learned that Tim Duffy, K3LR, has completely embraced SDR as a tool. He has a rack full of Perseus Receivers tied to CW Skimmer to look across the entire CW band during contests, and decode all signals. These signals are then introduced to regular contest logging software as "spots" in the same way that packet sends spots.

The big difference is that the Perseus/CW Skimmer spots are GUARANTEED to be audible by the station since they were collected from a receiver operating on site. Tim and others have become very impressed by what we geeks are offering to the contester. Please allow me to put the entire announcement from K1DG here:

"This year at Dayton, the new CQWW Xtreme categories were announced.

These new categories (single-operator and multi-operator) have been
established to allow amateurs to participate in the CQ WW Contest
while experimenting creatively with Internet-linked stations and other
new technologies that currently are not permitted in any of the
existing contest categories. The full rules for the new Xtreme
Category, as approved by the CQ WW Contest Committee, appear in June
CQ magazine and also at:

http://cqww.com/CQ_WW_Xtreme_Rules.pdf

This PDF file may be copied and re-posted to other Web sites as long
as this text is included: "Reprinted with permission from the June
2009 issue of CQ magazine; copyright CQ Communications, Inc."

Please forward this email to your local club reflectors and newsletters.

The new categories are effective with the 2009 CQ WW Contest later this year.

In essence, (almost) anything goes! The "almost" part means that you
must obey the rules of your country, including power (up to the CQWW
1500W maximum), licensing, and remote operation (if you use it).

It is permitted to use multiple transmitting sites with one callsign
(if legal in your country), but all transmitting sites must be located
in the same country and CQ zone, and only one signal is permitted on a
band at any time. Single-ops with packet, Skimmer, robot stations,
on-line databases, etc. are OK! Multiops with remote operators and
remote receiving sites around the world...OK!

The initial response at both the Contesting Forum and SDR Forum at
Dayton was very positive, with some of the SDR Forum attendees
actually challenging each other in public! This is a chance for
experimenters to see which technology innovations actually work best
in competitive situations.

If you have questions about the rules, please send them to Xtreme@cqww.com

There is an also email reflector (Xtreme-talk@contesting.com) set up
for discussions relating to these new categories. You can subscribe by
sending email to Xtreme-talk-request@contesting.com with the word
SUBSCRIBE in the subject line and message text, or go here:
http://dayton.contesting.com/mailman/listinfo/xtreme-talk
(thanks, K5TR)

K3LR has stepped up and is sponsoring the K3TUP Memorial Trophies for
the winners of the single-op and multi-op Xtreme categories.

73, and let the Xtreme Contesting Games begin!

Doug K1DG"

Thank you Doug and the entire CQ Contest committee. This is an impressive and thoughtful first attempt. I urge all to think about doing this. Flex users, HPSDR users, QS1R, Peseus, etc. can all make a valiant effort and with "innovation" being 50% of the score, a great single operator super star is not required to be a significant placeholder in this. Let's go!

Vuze, uPnP, Media Companies, and Freedom

2009-04-03T11:57:00.004-04:00

I am wondering when media companies will be convinced that people will not pay for lousy service and crappy content. Freedom is the only way forward and people WILL PAY FOR CONVENIENCE AND NOT CONTENT. If the artists tailor their approach to this, they benefit and when the drip turns into the flood THEY WIN. As much as I support the right of artists to be compensated fairly for their work, the entire system built to support them, screws every person who does not sit in the middle, artist and consumer, people who should be peers and are not. Who has not felt raped by Ticketmaster, or Sony (embedding theft protection malware in the audio CD) or the horrors of DRM.

Some artists get this, but I fear most are too lazy or too stupid to understand that with action (concerted to be sure) on their part, we have reached the golden age.

Adaptive Signal Processing, Polyphase Filter Banks, for the old and new

2009-03-19T14:12:00.003-04:00

Recently I have spent enough time on adaptive signal processing algorithms to have driven my friends crazy (yes, I do have friends). Everyone wants the polyphase filter bank code. I completely sympathize. While I am not a Dionysius (a Greek king), I invite you to be Damocles and feel the sword as you sit in my chair for a few sentences and then I won't bore you any more with this.

The polyphase filter bank code is "done". It has been for months. The implementation of the filter banks in question? A completely trivial matter for someone with as much digital signal processing experience as I have suffered, err uhh, enjoyed. There is a problem. The problem is significant and I am absolutely determined to solve it. Polyphase filter banks should be everywhere, ubiquitous if you will. They should be easily used, and easy to get right. This is a major problem but it really is the only one I am interested in pursuing to the end. I find that all of the major players, from my new friends and colleagues, to those I have never had the pleasure of meeting, have failed to address an overall structure.

The structure in question is how to do all of this in a completely automated way. You give me a few design parameters, ones that are obvious, I give you back a pointer to a filter bank object and from that moment on, you give me signal, and I give you output. What is difficult about this? The filter bank's signal performance is completely determined by the filters and the filter performance is determined by the size of the computer word. If you ask me to implement a filterbank with brick wall edges and 100 dB adjacent channel suppression, the filter design and the flow of signal through the filter bank needs new work done by fred harris and I (soon to be published). If you need perfect reconstruction with these parameters (the channelization is reversible to high accuracy through a synthesis operation), I return with a "you are a fool" and tell you the best you can hope for is ...... The nature of the filters inside depends on whether or not you want linear phase or not and .......

The construction of all of this filter determination code has been the object of study for brains better than mine for decades (Julius O. Smith comes to mind) but it is not all collected into one object. I am determined to crack this nut once and for all. Irrespective of how much respect I have for my filter bank colleagues, they have written enough papers on one-off designs. They have charged enough money for one-off consulting. Through the power of doing this right and then giving it away GPL and probably publishing a treatise, I am determined to make this a sea change, once and for all.

The work done by fred harris and I needs publication approval from my masters. These are the ones that feed my children, send them to school, and allow me to drive a fancy sports car and go to Broadway twice a month. The approval is coming. The filter bank FILTER DESIGN work is being done and we will all have it soon.

Thank you for your patience. Understand that I do the other things knowing they are not as important as the filter bank code. They are nevertheless necessary. They show off the differences between these sdr signal processing chains and what is possible in traditional "narrow band high performance radios" to the SIGNIFICANT advantage of the SDR's. I may be mad, but there is method to my aggravating pace.

Image Rejection along A Road Less Traveled.

2009-03-08T15:48:00.022-04:00

"I shall be telling this with a sigh
Somewhere ages and ages hence:
Two roads diverged in a wood, and I--
I took the one less traveled by,
And that has made all the difference" (Frost)

Some time ago we began the process of studying, learning, suffering, failing, and then succeeding that always accompanies the creative process. Many wrong paths were taken. Life always intervenes as ruts in any roads taken. I write this for all those who have suffered with us, demonstrating the utmost patience and most especially to tell our long suffering European friends (with HF broadcaster images) that relief has arrived.

We have known for some time the mathematics of fixing the image suppression due to amplitude and phase imbalance in the QSD. Alex Shavkoplyas has done a fantastic job of following down one road in Rocky. It is a beautiful thing and my favorite cattle prod, Phil Harman, asked me very pointedly "What is the matter with you on this?" I explained and it immediately began to gnaw at me how can we do this. My apologies in advance for it haven taken so long to reach a place of an acceptable algorithm. I wrote a paper that I put in DCC (replete with errors). I followed that up with an article for QEX. I am grateful it was never published. Now the good one will be.

Unlike Rocky, we cannot take more than seconds, much less minutes and hours to converge to a useful image suppression result. Once rocky learns on a particular piece of hardware with its ROCK-bound frequency, it only needs to tweak for changes in temperature, age of crystal components, etc. You the user would be quite unhappy if it were commanded by Big Brother (Flex, DttSP) that you could not tune your radio but once a day! I suspect that amateur radio operator Winston Smith would be in rebellion and Gerald "OBrien" Youngblood could not even torture you to accept it. I know my Julia (Shann N2HPE) has suffered the torture of this with me. I am eternally grateful for her partnership. The ministry of truth has convinced you to be patient. For this I thank you.

Knowing the theory and mathematical equations necessary to accomplish a task does not make it easy to accomplish this in an algorithm. Image present is the result of nonlinearities in the QSD, RFIC, or any SSB mixer (IQ mixer). So nonlinearity must be present in the correct fix up. Nonlinearity introduced on purpose in a system hailed by all for the linearity and signal handling capability of its front end seems at best contradictory, at worst, immolation! Nevertheless, it is required. The application of these nonlinear processes must be done with some care.

Our first attempts at deriving an algorithm that would work in DttSP and PowerSDR succeeded. But they were calibration dependent. Calibration at the factory means man hours and increasing costs to Flex the manufacturer. We accepted the less than acceptable status quo until a month ago because we just didn't have a useful plan to do otherwise. Doubts, internal as well as external, began to consume. The realist among us went "who cares". The idealist averred as to how this was unacceptable. Shouldn't there be a middle way?

Traveling to Austin to work on an implementation of the image suppression algorithm became the top of the list of myriad demands on my time. The top of the heap being the work that is being done by Flex for my employer and sponsor. Knowing the mathematics as described above allows one to write down an iterative procedure where sequential estimation is used to estimate the solution (based on approximations to Newton's algorithm in an application of the fixed point theorem to real life).

The TEN LINES OF CODE were written in an hour. They were working immediately. It was clear that we needed to use something like this but it was unclear how to use it in the system as a whole. It will cause some dislocation to manufacturing, require dislocation to calibration, and require dislocation to the user access to those pieces that the user, heretofore, had come to expect. Klaus Lohman, in expert testing, pointed out an issue which seems troubling but in the end, isn't. But this had to be addressed. We learned that some of the parameters of our search algorithm were wrong. These resulted in occasional numerical instability. We did not have a plan on how to roll this out at all, but we knew we must.

Last week I returned to Austin and the magic of working in a partnership filled with respect but constant questioning allowed by mutual trust, Eric and I worked out a way to use this in any system that would attempt to use it. It is not enough to have the right algorithm in DttSP. The correct application is dependent ON THE USER not the algorithm designer so it requires knowledge of how one correctly uses it in a system for it to be effective.

So eight weeks ago, I added the math to DttSP v3.0. Four weeks ago I put a version in PowerSDR. Last week Eric Wachsmann and I made it practical. The practical comes in asking simply how can this mathematical magic be made useful to the user. It turned out to be remarkably simple. When you tune the radio and you tune it far enough that you change the synthesizer frequency, the algorithm starts a retraining cycle. This must be made stable. So, it starts VERY fast so that the image is almost suppressed completely in about 50ms but then it begins a step by step decrease in gain in the algorithm and at the end of the about 500ms, it has converged. So we can just turn it off then right? Wrong. The algorithm even works on noise BUT its answer is off because loud signal is a better input than noise. So we could not turn the algorithm off completely. We learned we need to leave it turned on at a low convergence rate. Then we ran into the problem that again, you Winston Smith, are not going to allow OBrien dictate to you what to do and think. You are going to tune rapidly and foul this learning algorithm up and the stack would run dry! That too turned out to be relatively easy to fix. If you change the DDS, the convergence algorithm is stopped and restarted and that is done in a thread safe manner.

Now that this lengthy TMI (too much information) account is done, we encourage you to use it. This information is provided for one reason only. So you who have suffered the long wait with us understand something of the creative process and why that MUST be married with the practical.

branches/n4hy/iqtest/bin/Release contains the new code.

I have been experimenting with fixes to the ANF and NR algorithm and I have fixed the complex but separable versions in this branch as well. The ANF and NR is most decidedly not stable code as it will continue to receive work all week long until we have convergence to the acceptable algorithm there as well.

The necessary steps to see this in the trunk must be done in stages. We need resampling in the IQ processing chain. We need to turn the receive training algorithm off when you are transmitting so that transmit training algorithm will run with the benefit of the perfectly adjusted receiver. All of this must be seamless. We learn from experience that you are mostly uninterested in how, you just want the damn thing to work.

Following this, the entire IQ imbalance conversation concerning Flex, QSD, etc. should be long gone. This will be useful for RFIC's, QSD, etc. It will work on RX and TX if you have full duplex hardware (Flex 3000,5000, RFX boards for GnuRadio). It will work on RX on the oldest and meanest of our hardware applications (for example, it will work on SDR-1000) and an appliqué for Flex 5000 and Flex 3000 will allow it to train the transmitter image to the noise floor in YOUR OWN RECEIVER not to mention your ionospheric neighbors.

I will tell you that success is sweet. But I am entirely aware of how long it took. I reject any gratitude because at the end of the process I am really quite critical of my having taken so long to arrive at what, in the end, amounts to no more than 20 lines of code and I had to have excellent help getting there.

Beagle Board in a case

2009-03-05T18:42:00.003-05:00

Dear reader:

As you know from my ramblings, there is great interest in achieving high performance with low power in an easily programmable chip in order to do software radio. That is, I can order it to be an HD radio, FM stereo receiver, police band scanner, HDTV receiver, etc. just by changing the software.

While this may seem extreme, rapid progress IS being made.

Texas Instruments released the OMAP family and many of us have become interested in pursuing the bleeding edge of technologies, including the OMAP family. In particular many of us have built up systems using the Beagle Board. The Beagle Board is nice, but you still have to download a bill of materials, screw driver the thing together, and pray it will do the right thing.

Stop the presses, this is no longer required. Though one can put together a system that is less expensive than the Always Innovating offerings, one would still have to buy parts, assemble, and then cross your fingers. With the Always Innovating computers, this is no longer necessary. Go check them out.

Imogen and Web 2.0

2009-02-28T02:52:00.004-05:00

A long awaited album entitled Polyfilla is almost finished for Imogen Heap. Thank goodness she is active and sharing eye candy and other tunes such as

Blanket (with Urban Species)

One gets the feeling in the undercurrents in her Web 2.0 submissions on blog, twitter, myspace, facebook, twitpix, 12seconds and so much more that she thrives on the slightly more than tenuous connection and interaction with her fans. For us it is a LOT better than a quick autograph from a sweaty hand, tired from the act, only wanting to escape our clutches unscathed. She has volunteered all of this surely for her own motives. But so what? It serves some of our needs. That is the give and take. It is interactive to the extent they wish it to be.

The clear message in the sharing with her followers is that she derives not only pleasure or amusement, but some kind of connection of her psyche to those who interact and follow. Without the pain of supporting the demands and needs of a lover or demands for time from a friend or acquaintance, this large collection of other psyche's constitutes a sort of muse or maybe just a release valve; helpful in either case it seems.

She is not the only artist, writer, actor, politician or just good old public figure to find this an inspirational or emotionally helpful interaction. Stephen Fry, Neal Gaiman, and even Jane Fonda all seem to derive exactly the same thing from twitter. All of them using the laptops or smartphones can twitter, blog, and share pictures with all who follow them minute by minute, blow by blow.

This connection, as tenuous as it is, is like the torrent going over Niagara Falls in comparison to the silent unheard voices of what surely used to be their isolation inside their circle of handlers or neurotic needy friends and associates. They seemingly do it because they appear to derive something they need from it and further, they personally control the level and degree without a NO NO NO publicity agent, lawyer, company, their phobias or neuroses, etc. meddling with their heads and needs.

We have watched Stephen Fry twitter his way to great acclaim in several venues, lose weight, and become 10 years younger before our eyes. Neil Gaiman shares freely in his achievements, one after another, and his family life with his daughter, loyal assistant and even all the way down to the sufferings and redemption of his own favorite white German shepherd. Gaiman feeds our voyeuristic cravings for the tidbits of our idols and in return, gets one of the greatest of marketing tools ever. He uses it as such with a true sense of decorum by twittering, blogging and more, aided by the word of mouth of fan boys like me Have you seen what is going on with Gaiman?" Their exhibitionism and our voyeurism, sanitized with these tools, like a condom if you will giving excellent safe fan-dom, allows us to share in their blow by blow to fulfill our needs. In turn, we derive entertainment, information, inspiration, or something else entirely as needed. We shower them with praise, sympathy, adoration, disgust, whatever ... to our hearts content, so long as it is 140 characters or less! No long winded, uncontrolled, fan girl squealing in their ears and seeping gushing noxious fumes of suffocating fandom tinged with jealousy.

If it all becomes too much or they lose focus, the Imogen solution is a simple click away: "Sorting out video/ live/ budgets/ schedule/ meetings...shite! I haven't finished it yet! Need to refocus, shut it out and make music today." After feeding the battery, it is charged and can be put to use off the mains without connection to the fuel the masses have been providing until it is time for recharging again.

Watch this and see the creation process in action on Polyfilla.

This sharing and the feedback which follows in other media mentioned mitigate in favor of the premise put forward here quite clearly. Then it dawns on you, this is just one artist (as fabulous as she is). Then you remember that even septuagenarian actresses are doing the Web 2.0 dance. Sharing with us their illnesses, joys, glee at those other famous friends attending her new play . Hmm. This is getting interesting. So..... What about ..... so and so? Hit Google and find them. Search for them on twitter, facebook, myspace, or whatever. It is a revolution and a great one. But wait, I am doing it here (not that many care but it is fun)!

Web 2.0 is the potential of the internet finally beginning to reveal itself in a glorious way. It is oh so much better than television because it is interactive to a much greater degree. It is not (yet?) quite as satisfying as feeling the insides of Raskolnikov or Humbert Humbert rot before you in your mind's eye. And it certainly is not based on decades of writing, no, struggling whilst neglecting Nora and the kids, just so Bloom can live a single day in our imagination for the rest of our lives. You don't need to read well, have a great vocabulary, or even just the time to read the novel .... but it is fascinating, entertaining. It is getting there.

Nishere

2009-02-22T02:14:00.000-05:00

Stephen King's Nishere.com player:

The King (Honda S2000) is Dead. Long Live the King

2009-02-21T01:26:00.004-05:00

Honda has decided to stop producing the S2000.

You may see here this is before I put dustless pads on it (dust from standard brake pads is seen to discolor the beautiful rims).

The S2000 story is a bit of fairy tail apocrypha. The anecdotes go that the engineers wanted to take the V-Tec engine and make a hand built serious sports car for the Honda enthusiasts. They were allowed to and in 1999 they sold a few. There grew a ground swell of demand for the award winning, high performance, fantastic driving, hand assembled car that sold for UNDER $40000.

My favorite single day in it was driving to see my mother in Alabama. I was coming from Orlando and this was a "pit stop", only slightly out of the way, on my way back to NJ.

I hit an infamous many mile stretch of back road that is about as straight as they come. I hit 150 mph and I was still accelerating and not at red line. It felt like I was doing 70 on the interstate.

I love this car as I never believed I could love a car. The story goes that Honda lost money on every one they ever built. So it makes sense that it is a 10 year vanity statement for Honda that needs to go, especially in these times.

110000 were made and sold, last month they sold 1000-ish world wide. Of the total, over half were to the USA (surprise!). Mine will rot into the ground before I give it up since that is how I have used every automobile I've ever purchased. Those would be the ones that I gave my kids when they wanted a new BMW convertible!

Many roads to go down, I chose one, and that made all the difference

2009-02-21T00:57:00.002-05:00

May Frost forgive me.

I have written in these pages about the Intel ATOM 330 and its instantiation in an Intel Motherboard, the D945GCLF and D945GCLF2. Both of these boards have really good performance for a mobo costing $90 or less!

Always, there comes along a better mousetrap. Nvidia has done itself proud it would seem with the ION. The ION addresses what are, in my opinion, the worst shortcomings of the Intel mobo offerings

The ION has DDR3, 2 GB built in. The D945GCLFx has a slot for memory and will only use DDR2.

The ION has GeoForce 9400M. The Intel has Intel 945 graphics chip. The 9400M is by all sorts of measurements "ten times faster".

The ION mobo and small box have much better connector support for IO and have only external SATA drive support. This is better.

Some other recent work shows that the JFS appears to seriously outperform ext3 for Linux file systems in many ways. Since I want to upgrade my mass storage drive on my (current) main Linux development system to 1.5+ TB from 250 MB and an older drive using EXT3, I will do the work there to test. Should that work, I will back up the home directories and other /usr/local and /opt directories and copy the main drive to another large disk using JFS. There appears to be much better dynamic control over inodes in JFS rather than attempting one size fits all (pun intended).

We are back in old man winter after a brief respite. This makes it easy not to do outside work that needs doing and to read another novel. I could not remember much of A Separate Peace by John Knowles so I decided to polish off this novel(la?) yesterday and today.

Soeaking of today, Tom Rondeau and I made a pitch to Dr. Saltman, director of CCR and Dr. Boyack, director of computing CCR about two labs we need to efficiently do our software radio and cogntive radio work. They bought all of the arguments and told us to draw up a list of things we need, procedures for transferring code to and fro, etc. It was a nice meeting.

Frank Brickle gave a nice talk today at work on SDR, CR, VR, ... etc. It was great.

White Space (NOT a rascist remark)

2009-02-08T10:54:00.011-05:00

White Space is the term broadly applied by technologist's and the FCC to the vast spectrum spaces, especially in urban areas, which are wastelands. For now, we will concentrate on the frequencies currently allocated solely to television stations. Since there are only a few channels occupied in even the most populous cities, coupled with the fact that the primary propagation mode for these frequencies is line of sight, much of the spectrum for TV channels is completely unoccupied even in these cities.

We need spectrum to increase the amount available to wireless devices. The FCC realizes this and in November of 2008, issues rules allowing this. CTVR at Trinity College Dublin has been interested in this concept for a while. A prominent DARPA project manager, Preston Marshall, a leading person in DySpan has long been interested, personally and professionally in White Spaces (a Dynamic Spectrum hot spot issue, pun intended). Preston is getting his Ph. D. from CTVR.

Tom Rondeau, hired by my employer, with my being the primary instigator, finished his Ph.D. thesis for Charles Bostian at Virginia Tech while working at CTVR. He then did a short post-doc before joining us. While Tom was at CTVR, with Keith Nolan, also of CTVR did a cross country tour following the SDR Forum meeting in Denver Colorado in Oct. 2007 and did a survey of white space while doing their drive.

This will be of increasing interest in the coming years with a lot of support for this coming from a consortium including Microsoft and Google.

Coraline

2009-02-06T07:02:00.003-05:00

Neil Gaman's Coraline opens in theaters today in 3D if your theater does it. I paid for 50 3D glasses with "lovely" designs all over them for a viewing party for family, friends (strangers, drunks, .....). Thank goodness they only cost $20 (plus shipping and handling of course).

It is a beautifully written book with enough illustrations to allow you to get an idea of Gaman's imagination when he sees his story. I recommend the movie release version of the book because it contains an interview with Gaman, Henry Selick (director) who did Nightmare before Christmas and James and the Giant Peach. This version also contains excerpts from the movie screenplay, illustrating some differences from the book (such as a new character). I love stop action animation done with class. Selick is clearly capable.

Enjoy!

MEP

2009-02-04T23:27:00.006-05:00

The Microwave Engineering Project, referred to in earlier entries, has pushed ahead with a multi-pronged approach building hardware for the testing of the overall design elements of the communications system to flow from the project.

Beagle Boards and Intel ATOM computers, using ARM/NEON/TMS320C64X and Intel Atom 330 respectively, will vie for control of the user interface and digitization and playback of user signals. The BB is lower power and much more compact using podcast and is here directly.

Michelle Thompson, W5NYV (MEP fearless leader) has 3 each beagle board and ATOM 330 mobos to play with.

Suitsat 2

2009-02-04T15:16:00.005-05:00

Suitsat 2 has moved in fits and spurts and not even close to a straight line towards its goal. During the past few days, we have pushed on and received movement in several areas. I believe working hardware for this can and will be produced and that leadership will exert direct influence on this path. I am NOT in a leadership position but a grunt trying to get some of the pieces done.

I worked a plan with project management tonight (Feb. 4) to provide some serious documentation leadership so we can get the tough interconnection pieces done in a timely fashion and then glue the experiments together.

Suitsat was a big success the first time and it was fun being the first to "get" the picture and identify what it was. It was decided that Suitsat 2 should be undertaken but be more ambitious in its scope as can be seen here and here. The project is based on the use of Microchip's dsPIC33 as a low power SDR capable dsp engine. ARISS is an international program who mission is to promote use of amateur radio on the International Space Station.

The transmissions from this package will be receivable by anyone with some simple equipment and my fingers are crossed for its eventual success.

Filter Design Book recommendations

2009-02-04T14:41:00.002-05:00

Followers of the work of Frank Brickle and I know that Frank has for years followed and promoted the work of Julius O. Smith. I subscribe to this support. Fortunately, JOS has done a lot of publishing his work online for years. And he is winnowing down into books such as

Introduction to Digital Filters with Audio Applications (at Amazon)

or

Introduction to Digital Filters with Audio Applications (at Barnes and Noble)

as well as his awesome treatment of Mathematics of Discrete Fourier Transforms belongs on the signal processor's shelf.

I have also looked through quite a few other books and have purchased these and wish to recommend them:

Introduction to Digital Signal Processing Filter Design by B.A. Shenoi

and

Digital Filters Basics and Design by Dietrich Schlichthärle

With these books on my shelf, I am able to make very good progress on my longer term goals of rending "fdatool for free as in beer" for Octave and SciPy.

The Wrestler

2009-02-04T09:47:00.003-05:00

Filmed in a grainy looking format with what feels like a hand held digital camera, the cinematography brilliantly sets up an ambiance of decay, seediness, and failure.

Mickey Rourke enters into a semi-autobiographical role and does not pull a single punch in showing a life of one time success, but a complete failure of meeting responsibilities to those around them, and ultimately, to himself. Rourke could not possibly play this role better. The toughest part of his performance is knowing that he has lived this life already. You can hear in his breathing the respiratory degradation he currently suffers. In his face, not covered with a single bit of makeup, you can see the marks of a life poorly led.

Marisa Tomei plays her role beautifully. As an aging stripper, with a kid to raise, and Rourke's love interest, dealing with facing the facts that she is no longer capable of playing the role she must play as stripper, she takes her multilayer character and shows us all the layers with what seems perfect identification with each.

I do not know if Rourke can win over Penn and the other great roles nominated, but certainly, his role deserves the Academy Award nomination it has received.

Travel and Weather

2009-02-03T10:45:00.004-05:00

I can get just a bit harried and I did not check my tickets carefully this morning. I had specifically asked for train tickets to and from Princeton Jct. on Amtrak. I watched as the train pulled away from Pct. Jct. 15 minutes before I was supposed to board ...... in Trenton.

I will check more carefully from now on.

The skies are opened and white stuff is falling but the temperature is above freezing and nothing adding to the road.

Why is having this lousy weather renewing my interest in a touring motorcycle? Weird.

I am working remotely on the dual cell broad band engine server at LTS. I am also continuing to hack on DSP code for all sorts of things. When I run out of mental fuel for one, I jump to the other. It has always worked and appears to continue to. Go figure!

Some views from today's "near miss" Nor'easter:

Anyone for a swim?

If it weren't so much trouble and mess, you could like this beauty.

My BigIR vertical and part of my NVIS array under the weight of the snow

Reading Steinbeck, Working on DSP/SDR, Playing with toys on a warmer day

2009-02-01T15:03:00.006-05:00

Just finished Steinbeck's "The Moon is Down". One of the most intimate portraits of occupation by and resistance to an occupying army. May I suggest that this be mandatory reading in all war colleges all over the world?

Continuing today on filter design software and more, both stand alone, and for application to polyphase filter banks. This is sheer tedium but it must be done, correctly, and in GPL software so people like me do not have to waste their bloody time ever looking for it again. I am determined to make fdatool for Octave and scipy.

I am playing with different coffees these days. My most recent "trial" was on Jacu bird coffee from Brazil. It is euphemistically listed as "bird selected". It bears no relation other than that to the horrible and expensive Kopi Luwak which is "civet selected". My favorite continues to be Sumatra Lintong. I have found another green bean company besides SweetMarias.

I also like several Ecuadorian, Panamanian in addition to the expensive Jamaican and Hawaiian coffees. For every day, the latter are just a bit over the top in price. My coffee roaster, an Iroast2, has easily paid for itself many times over. The green beans are considerably cheaper per pound, even in small quantity, than "grocery store" ground swill. My brewer is a Technivorm and is carefully controlled to brew at exactly 93C/200F. Ummm, Mmmm, GOOD!

I recently purchased one of the "Chinese electronic wonders" that cost 10% of what the same American or German made instruments cost 10-15 years ago. I purchased a Vector charging system. It cost $120. The cheapest thing I had seen before it that claimed to do what it can do was nearly $1000. It will charge at 2, 10, 20, or 40 amps. It will also pulse rapidly at high amperage/voltage to recondition badly handled batteries. I have 320 amps hours in series 24 AGM deep discharge batteries. I neglected them horribly for a year. They were all in bad shape. The difference nowadays is they cost well over $200 each. I recovered two of the cells to over 1/2 capacity with two treatments, up to five are useful. One of the cells is beginning to show life after two treatments, so I hold out hope. One is dead. So the unit has easily payed for itself in one set of savings. I paid 1/3 what these batteries cost now.

Winter is letting go a bit. It is 10C/50F. Quite comfy in a sweater, and sunny as well.

Interesting projects

2009-01-30T10:43:00.005-05:00

These days with RFIC's coming along, interesting ways to make stable microwave oscillators, there are a couple of interesting projects for the radio amateur. Both are moving a little slowly but with help from you gentle reader they could move a lot faster:

Microwave Engineering Project adroitly led by Michelle Thompson, W5NYV and uWSDR led by several good folks. Both are worth investing some time with to see if you can help/enjoy this kind of development. Both are peopled by very strong engineers, hardware and software.

Cheers, N4HY

No Limits

2009-01-29T16:21:00.001-05:00

I joined No Limits for Hillary.

Bayesian Nets, MDL, MCMC, Visual Studio 2008

2009-01-29T16:14:00.003-05:00

Today my employer and I agreed to engage Frank Brickle as a consultant for the purposes of working on the application of Bayesian Nets, Minimum Description Length, Monte Carlo for Markov Chains to the problems of cognitive radio. A large bibliography is being prepared for our efforts by several people.

I helped Eric Wachsmann of Flex Radio to port their PowerSDR from MS Visual Studio 2003 .NET to Visual Studio 2008 and to use .NET 3.5.

OMAP processor/ Beagle Board

2009-01-28T05:58:00.002-05:00

The Beagle Board is beginning to gain some push from inside TI. That is good news. In addition to the recently release free version of Code Composer Studio for these OMAP parts, we find ARM releasing library support, including NEON code (bottom of page) and TI releasing library support for the TMS320C64x . I am assured that more is soon to follow.

Good news! These processors are more than capable of running DttSP SDR core and that port will begin.

At work and play

2009-01-26T14:09:00.002-05:00

At work and at play, I am building the infrastructure for filtering and polyphase filter banks in pretty great generality. I have offered to uwSDR that I will be working on devices to do SDR narrow band computation which will enable portable and/or low power computing devices for their use.

My Intel Atom 330 is showing itself nicely. It is also pointing out ugly hot spots in the DttSP core that require the use of resampling to greatly reduce the computational complexity. I HATE to keep giving Microsoft any credit but ... Netflix built a player around Silverlight. It is clear Silverlight is a competitor to flash in some sense. It really is smooth and a great replacement for the Windows multimedia CRAP they had before.

My design of the W8JI eight circle receive antenna for 160m at the home station of Joel Harrison's W5ZN is working out amazingly well. Joel is a real believer now and my design work and construction work appear to be right on the money. Joel has been a fantastic partner in this. He has been continuously comparing his new receive array against his long beverages and finds there is no comparison. He can now hear what he could not detect before. WHEW! One does not want to make the president of the ARRL unhappy!

Social Commentary

2009-01-24T11:37:00.001-05:00

The most inspired social and political commentary of our times: Wazzup

Winter, Second Order Sections

2009-01-23T07:06:00.003-05:00

Winter blows! I am not a skier. I am a Southerner. Twenty nine years of living north of Mason-Dixon is not enough to like these winters. On the other hand, I hope it puts a dent into the bug population.

This morning I am putting second order sections into GnuRadio trunk. I cannot believe this and other IIR filtering gadgets are not present.

Back at work

2009-01-22T14:37:00.004-05:00

I am back at work in NJ. I am working primarily on two things. The first is the wrap up of my polyphase filter bank code. This will wind up in GnuRadio, DttSP, HPSDR, and more. Next, with Tom Rondeau, we are trying to get a killer app together for the Cell processor in general, but the PS3 in particular. If we do not succeed, I plan on giving up on the Cell altogether (just as IBM has done in my opinion).

The problem with the Cell is two-fold. First, it is too difficult to program and it is not commodity priced. The former has led to the latter. Graphics cards and GPU's are here to stay. They will be here long after everyone forgets the name Cell BE and they are going to be fast. It is a shame that IBM had so little real interest in pushing this forward and each step of the way I consider major mistakes to have been made that prevented it from catching on. My guess is that the Cell BE 2 will be at best a small make over of the Cell BE and at worst, tossed over the side and handed off to Sony to utterly ruin.

I think the best option overall, for serious high performance software radio computing is the new AMD Phenom, Intel I7, and Nvidia GPU cards sitting in PCIe-16x slots. These will be programmable, with the fast hardware usable by compiling in function calls and/or intrinsics. This will not be optimal, but it will be immediate. It takes over a month just to get linux installed, Cell SDK installed, learn enough to do anything, and then you have to deal with DMA, memory that is too damn small, and very expensive pricing for anything but broken versions (6 SPE versions of Cell in PS3) and their horrible GigE support because we can't have DRM/Video/BlueRay thingy's stolen now can we? BlueRay will also fail to be a big money maker like DVD's. Streaming media is going to nail it to the floor.

Enough prognostication. Back to work!

Imperfections in the sublime

2009-01-20T23:42:00.002-05:00

The Flex 5000 is one of those pieces of engineering for which I hold great admiration. This is quite natural. My grandfather, a true man of vision, believed strongly in taking things on and owning the issue. I worshiped him until he died before my teenage years. He often asked me, when I was half assing something if I "knew the difference between interested and committed? The chicken that gave you the egg for breakfast was interested. The pig that gave the bacon was committed!" To SDR I am committed, and the Flex Radio company is, to a large extent, responsible. My work was also strongly encouraged by my life long friend, Tom Clark, NASA astronomer, avid amateur, and a fantastic polymath.

The Flex 5000 has my fingerprints all over it. I did not pick the parts that established the circuit functionality in it, but I was most definitely involved in its design. It was a serious step towards a radio device that would meet my needs and allow me to establish certain goals for radio equipment of this type. Gerald Youngblood has been and continues to be a great friend.

Now with all of that behind us, one should never be afraid to admit that there is a thorn on the rose. The quadrature sampling detector is a marvel. It is not perfect, but its perfection is achievable in so many ways with hardware modifications and software additions, it will cause the world to sit up and take notice. It already has and it is 20 dB from its ultimate physical limits of performance.

The quadrature sampling exciter is and will be a mistake. Its imperfections, also correctable, are much more difficult to achieve for many reasons. Slight imperfections, amplified by multi kilowatt amplifiers, are glaring. These are also fixable, primarily in software, but there is no need.

Penelope and any other D/A driven digital up converter is the appropriate foundational element for excellent exciters.

I worked for hours today to put into place a fix for a wart in the 5000 QSE based exciter. It works. But again, this work is putting a band aid, albeit a brilliant one, on an existing device in an existing code base, rather than inventing the new or implementing the "known needed algorithms".

I am sure this message is getting through.

Inauguration Day

2009-01-20T12:02:00.003-05:00

Watching the inauguration on television, and feeling good about today, full of hope and good wishes for our new president.

Yesterday, Today, and Tomorrow

2009-01-18T11:30:00.001-05:00

Yesterday I worked fairly hard on the wideband IQ imbalance mitigation problem. It is clear that the correct approach to this problem is to make the performance of the radio better and to ignore the primarily pyschological issue of the sensitive spectrum analyzer display.

The figure below shows the IQ correction for receive strictly limited to the passband of our receiver for the 7 MHz amateur band.

The next figures shows the necessary correction to IQ balance the entire IF passband at one frequency, 7.150 MHz in the Flex 5000. This will be a truly painstaking set of data collection to try and fix the entire wideband problem so the spectral display looks nice when what we should care about is improving the performance of the radio in the passband of the receiver. To do that across the entire 40m band (for example) can be trivially done from the data in the first figure.

The data collection and the new training algorithm will be installed in the PowerSDR code base before I leave. We then take the slower approach to mitigate the perceived wideband problem, which has NO impact on receiver performance but impacts the display. The wideband IQ correction will not easily lower the image to the noise floor across all frequencies. It can and should lower it to near the noise floor and to a greater extent than we currently do.

Yesterday I read most of Neal Stephensen's Snow Crash. He takes a road that combines the troublesome aspects of technology aptly shown in Gibson's Neuromancer and the biting social commentary of Pynchon's Vineland . I am very sorry I have not read him before now. Most place him in cyberpunk. This is not an adequate label.

Tomorrow Eric Wachsmann and begin adding the new IQ algorithms into production, including addressing all of the ugly issues that comes with supporting a large user base.

Intel Atom 330, Travel

2009-01-14T23:29:00.000-05:00

I am done completely with set up of Intel Atom 330. It is pretty amazing. I suspect that every manufacturer of computers is pretty unhappy with Intel. This is an amazing capable quad thread (dual core HT) machine EM64T. I am running both Windows XP64 and Ubuntu amd64 (x86_64) on it. It will be my dedicated SDR and multimedia TV machine. MythTV, streamer for windows required services (SCREW DRM!!) such as Netflix and Rhapsody, hulu.com, and more.

I think Blu-Ray is a diller a dollar a ten o'clock scholar. Streaming HDTV streams vitiates any market for Blu-Ray (and large book shelves to store the media).

Off to Austin, Tx tomorrow for a week of SDR work at Flex. This week is dealing almost exclusive with adaptive filtering for all sorts of impediments.

Intel Atom 330

2009-01-14T01:57:00.000-05:00

Have completed installing OS's, updating the BIOS, and running several applications on my Intel Atom 330 screwdriver job. I got it on an Intel D945GCLF2 motherboard. The entire computer cost $200 and it outperforms my desktop (old P4 HT), plays excellent quality graphics into my 52" Sony Bravia. The GigE appears to have excellent support under Windows XP and Ubuntu Linux. Both are 64 bit OS's. I am just amazed. It should make for an excellent low end software defined radio dedicated computer as well as streaming machine for my television center.

Blackberry Storm

2009-01-13T23:18:00.000-05:00

For Christmas I purchased a BlackBerry Storm for my daughter. She updated her phone to version blah.blah.blah.75 and since then there has been nothing but bloody problems. The phone shuts itself off and a battery removal has to be done to recover. This is a damn $500 phone. How in the hell can Blackberry release firmware with this kind of effing mess up in it?

We know this because there are reports of it on Crackberry. We went to Verizon to replace the phone today and they gave us a new one in the box, having blah.blah.blah.75 in it and it has done it TWICE since we got it home.

I am TOTALLY pissed at BlackBerry and Verizon over this stupidity

July 12, 2008

2008-07-12T11:57:00.000-04:00

Currently busy with implementation of multiple filtering/multirate/filter design code implementations for multiple purposes. The Cell processor based equipment (Playstation 3 for most) is approaching usefulness to GnuRadio and other things. Schedule to go to Vancouver in a week to spend several days working with Frank Brickle on our joint software defined radio kernel.

I have the RX2 (second receiver) in the Flex 5000 SDR now. I am doing experiments with diversity combining and trying to figure out the best way to display the activities.

2006-03-11T00:31:00.000-05:00

My Weather

Too many things happening.

2006-03-05T17:51:00.000-05:00

Please visit this link to see the Flex Radio Archives (this is a blatant attempt to get Google to index it).

Since my last posting I have been so busy I could barely keep my head above water. I began a white paper on AMSAT's new spacecraft. I have interviewed 51 applicants to Brown University (my alma mater), written major new pieces for Flex Radio's PowerSDR , starting bringing together the changes needed to release DttSP version 2.0 (not yet released) with AB2KT, and completed the stereo FM demodulator/demultiplexer for GnuRadio . WHEW. Sorry for the delay in getting this up. I will have a lot more to write about all of this soon.

73's
Bob McGwier (N4HY)

WSJT 6 work

2006-01-10T01:28:00.000-05:00

I have begun helping Joe Taylor, K1JT, author of WJST in an effort to port WSJT to Linux, and to add a GPL version of the soft decision Reed Solomon decoder so we can remove KSVAD (a licensed and proprietary and closed source decoder).

Please check out a short pdf of the work so far: wjst.pdf

This work is being done by a group of people and the work is being shared with svn on a berlios.de server.

Stand by for more.

December in Marburg, Germany

2006-01-10T01:21:00.000-05:00

I spent two working weeks in Marburg Germany with Karl Meinzer at Phillips (Marburg) University in the ZEL ( Zentrale Entwicklungslabor für Elektronik).

Please see:

Gallery of Photos of visit

During this visit, Karl (amateur radio opeator) DJ4ZC, long time engineering star for amateur radio satellite community, did major technology transfer on IPS, IHU, SDX, HELAPS, etc. Please stay tuned for much more in the way of details on the language, computer, transponder, transmitter design (respectively).

Almost Thanksgiving

2005-11-21T18:54:00.000-05:00

It is almost Thanksgiving and time for another entry. November has been enormously busy and fun.

I spent the week of November 6 through 11 with Eric Blossom (K7GNU) and Matt Ettus (N2MJI) of GnuRadio and USRP. Please see

http://www.ettus.com

GnuRadio

We managed to get some exciting work done. We did a complete packet radio system that ran at 768 kbps using GMSK on the computers we had available with no tuning whatsoever. The packets were 1500 byte packets (go ethernet). We managed to get resamplers, pll based fm detectors, lms_dfe equalizers, and myriad other modules working. Matt is about to introduce his FlexRF boards. We used the FlexRF boards for 70 cm and got a functional 70 cm FM transceiver, including squelch and PL tone decoding and generation going. (Remember, this was five days work!). Matt and Eric were extremely patient with me while I learned the Gnu Radio system and I feel together we made some very real contributions.

My best friend and work partner, AB2KT, Frank Brickle, was supposed to go as well representing AMSAT. We all missed him tremendously but his father was having surgery done. We are grateful that has gone well and look forward to our next meeting with Frank in attendance.

I managed to get the code at the heart of the Flex Radio SDR-1000 to run using SSE and the SSE version of FFTW.

Flex Radio

This should provide for increased efficiency and faster code at the heart of the SDR.

This coming weekend, the Saturday after Thanksgiving, AMSAT-NA will hold an RF meeting in the Princeton, NJ area for the Eagle Spacecraft project.

AMSAT Eagle

As AMSAT's new Vice President for Engineering, I have some fun technical duties and some managerial duties but for the most part it is like returning home. It has been a very six weeks since I became the AMSAT VPE, and I expect the next few years to be very interesting indeed.

On Dec. 2-4 I will be operating at the world class 160 meter station in Tuckerton, NJ assembled by the W2GD crew. John Crovelli has gathered a world class crew and for some reason allows me to play with them. It has been a lot of fun! Expect us to be LOUD. I was able to make some changes to the antenna farm and expect to build my receive array ideas there during the next year.

From Dec. 5 - Dec. 16 I will be in Marburg Germany. I am helping to write the software for the flight control computer for AMSAT-DL's Phase 3 Express program. Written in a language designed by the technical lead for the project (IPS by Karl Meinzer, go grab an old Byte magazine and read about it), it will be a challenging task. Since we will be using the same computer for the AMSAT Eagle program, this is not interference but synergy between the two projects.

AMSAT-DL Phase 3 Express

Please visit my photo pages to see pictures related to this blog

N4HY Pictures

More next month!

Wow, what a month: AMSAT, OFDM, etc.

2005-10-16T09:24:00.000-04:00

The month since my last post has seen a whirlwind of activity. I have been working on several things and you can expect to hear more about all of this as time passes.

In August and September, I joined a conversation with John Stephensen, KD6OZH about doing some really nice coding for OFDM based modems for communications systems for amateur radio and even outside of amateur radio. Frank Brickle and I are building our Near Vertical Incidence Skywave antenna systems to use the 7 MHz (40 meter) amateur radio band to some experimentation on this system.

We will be doing our first experiments with the SDR-1000 because of the ease of using it for wideband HF communications. We will be implementing a concatenated code system (two forward error correcting codes back-to-back) in conjunction with a permutation system for the data and then encoding this data for tranmission in a system called Orthogonal Frequency Division Multiplexing (OFDM). The basic reasons for such a system is that in makes use of diversity in time and frequency to spread out the pain of transmitting data over bad paths. It has been demonstrated in many places how effective this type system can be on the horrible paths of HF (shortwave).

In addition to the work briefly described above, I have begun a serious study on the tranmission protocol for such a system. There has been tremendous progress in systems that transmit data and then retransmit data if the receiving misses all or part of the data. We believe we can implement an automatic request for retransmission (ARQ) system that can achieve rates that approach 90% efficiency and waste a minimum amount of time doing the transmission protocol. Lin/Costello's new edition of Error Control Coding has just been released and their is an absolute spectacular discussion in an entire chapter with a huge bibliography on this topic.

At the annual meeting of AMSAT, NA Software Defined Radios were a major topic. Tom Clark and I have been working on a system we jointly proposed with Phil Karn two years ago and we have made steady progress in studying the system (see http://www.gpstime.com for the CC Rider papers). In the two years we have been pursuing this scheme, we have done a fair (C+) job of selling the system. Matt Ettus of GnuRadio and USRP fame

http://www.ettus.com

did a better job in 45 minutes than we have done in two years of selling the entire concept. He proposed a hardware system for doing the communications and really blew the audience out of their socks. With the system proposed by Matt, we would be able to build a fairly complex text messaging system that would need a "paper clip" for an antenna!

I was first alternate to the board of directors for AMSAT this year. It was interesting to do be in on these conversations this year as there is a lot of new blood in the AMSAT board. I was a member of the board of directors a decade ago and more and it brought back pleasant and unpleasant memories of the wrangling that goes on in these meetings. Anyway, the organization asked me to be its Vice President of Engineering. This is one of the corporation official offices (in the by-laws) and will require me to change modes a bit. Thankfully Jan King and Karl Meinzer (google for many pages) will be available for technical consulation. Please visit:

AMSAT

More later . .

Been a very busy month

2005-09-14T22:54:00.000-04:00

I have IPS (see IPS ) running on the AMSAT IHU-3. The IHU is the internal housekeeping unit of the spacecraft. It receives and processes commands, it maintains the state of the spacecraft and attempts to mitigate faults and generally manage the health of the spacecraft. I have pictures of our meetings in Germany and Washington state in these gallery entries:

Germany: Germany IHU-3 pix

and

Washington: Washington at KK7P IHU-3 pix

We can talk to the bus of the spacecraft and programming of the IHU flight code has commenced.

The American Radio Relay League sponsors technical working groups. I am chairperson for the Software Defined Radio working group and a member of the High-Speed Digital Networks and Multimedia Working Group. We are working on a class of modems ideally suited for both HF and VHF and Microwave communications. The modem class is called OFDM and this is orthogonal frequency division multiplexing. This is a fancy name for sending a bunch of data down parallel channels (parallel in frequency) and done in a way that the frequencies used provide an very nice mathematical property which aids considerably in the modulation and demodulation of these signals.

AMSAT will be holding a board of directors meeting and AMSAT Eagle spacecraft design meeting in Pittsburgh Oct. 6-9. I will be demonstrating with my partners a working software defined transponder SDX. You can hear the first QSO by visiting

GPS Time page with SDX pix and audio

Please visit the last bulleting and you can download and listen to the audio.

The ARRL review of the work Frank Brickle (AB2KT) and I have done, in cahoots with the folks at Flex Radio is available here:

ARRL Review of SDR-1000

By the time of my next entry, I will know if I am on the board of directors of AMSAT. I was talked into it, I have done it before and chose not to run back when AEA failed and amateur radio lost its luster. I am glad it has regained it.

August 2, 2005

2005-08-02T16:17:00.000-04:00

I have managed to get the IPS-E0 image (the basic IPS operating system) into the bootloader for the IHU-3 (integrated housekeeping unit for Phase 3E and Eagle). It will be easily loaded via the bootloader by just striking the E key. This enables us to upload, using the bootloader, any type of IO, interrupt handler, etc. that we wish to upload. This should greatly speed the development process for the flight code for Phase 3E.

I have added some CAN controller initialization code to the bootstrap IPS routine as well as an asynchronous communications mechanism. It will use the flag facility already built into IPS to send and receive 512 byte blocks but it will be almost completely limited to printable ascii characters.

On the SDR-1000 front, I modified some of the settings for the "microphone leveler". It appears that we have too much early attack which appears to limit the average power too much. It may be that we never wish to allow for negative gain at this stage.

It is clear that serious investigation of this process is required. I only wish I could force myself to be interested in doing it. Sigh.

The SDR-1000 official numbers are in. 99 dB IMD-DR and +27 dBm IP3 on the low bands at 2 Khz with the preamp in medium setting (giving <-120 dBm MDS). OUTSTANDING.

Bob