Re: [Flexradio] Round two of the SoftRock40
Hi Tony, The idea of having a separate dedicated audio codec for the SDR is really nice. It is something I have been advocating for some time. I have built an USB codec using the pcm2903 early this year and it works very nicely with a simple monoband QSD I have also built. The USB codec is only 16 bits @ 48 kHz, but the ADC/DAC quality is better than most built-in sound cards. One note about the Burr Brown chips: There is a bug in all PCM29xx codec series. The USB audio stream has one sample delay for both the ADC and the DAC. This is easy to fix in software though. Without shifting the sample, it is not possible to achieve rejection of the opposite sideband. I have contacted the TI/BurrBrown engineering division and they have confirmed the bug. Another project I have started but have not yet finished due to serious lack of time in the last few weeks is to use a fiber-optic link for the USB signals. There are relatively cheap fiber optics devices available that can be used to isolate the computer from the radio. The adapter would aliviate problems with common-mode computer noise, ground loops, etc. 73, -- Edson, pu1jte, n1vtn, 7n4ncl Tony Parks wrote: Hello All, I recently completed a new layout of the little SoftRock40, 40 meter SDR demonstration receiver. The new PCB is 1 inch wide by 2.3 inches long with a USB type A connector on one of the narrow ends for getting 5VDC power from the PC to the board. An antenna connection to the board and a stereo cable from the board to line-in completes the electrical connections. Bill's (KD5TFD) hacked beta version 1.3.7 makes the radio play in quite a nice way. With the new layout the four SMT ICs and associated 0.1uF SMT bypass caps are on the backside of the board for easier building and debugging. Components on the top side of the board are through-hole. Additionally, a companion 1 inch by 2.3 inches board is laid out for installation of a TI PCM2900 stereo audio codec with usb interface. This experimental board will let people try a self-contained SDR receiver with only a usb interface to the PC. With my recent board order, I will have 20 SoftRock40 boards and 12 codec boards to provide in kits. (The PCM2900 chip can be gotten from TI as a sample and will not be supplied in the kit.) A number of people have already indicated an interest in a SoftRock40 kit from the next batch of kits. The following options are offered in round two of the SoftRock40: 1) SoftRock40 kit only at $29 2) SoftRock40 kit with physically attached experimental codec board at $29 3) Codec board only at $2 to cover postage 4) SoftRock40 kit and separate experimental codec board at $29. These kits are offered only to stimulate interest in the SDR-1000 and the PowerSDR software. Kit prices are set to recover my expenses. Let me know if your are interested in any of the kit options. 73, Tony KB9YIG ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
[Flexradio] Linux jDttSP
Good Evening! This is a question to Bob or Frank regarding jDttSP on Linux. I am trying to get a Qt-based GUI implemented to control jDttSP and have noticed that the spectrum data was not being correctly written to the spectrum FIFO. After some tracing, I've found that the problem was due to the fact that the window[] function array for the spectrum FFT was not being initialized. For testing I've initialized the window[] in init_spectrum() for the moment. Later I may include it in update.c. Now I have spectrum data coming out of the FIFO, but I've noticed that when setting the spectrum to PRE_FILT, the spectrum slides on the frequency axis following the setOsc setting. Trying SEMI_RAW does not work unless I set the mode to SPEC (setMode SPEC). But this changes the audio filtering and does not change the spectrum sliding behavior. One more thing I have noticed is that there is no change in the demodulator when I set the mode to USB or LSB (setMode USB|LSB). The only way I can switch SSB sidebands is by modifying the filter passband to negative values. My questions are: 1. Is the initialization of the window[] function left out in the Linux code? 2. Would there be a way to get a snapshot of the full 48 kHz raw complex spectrum without any interference from the tuning? 3. Is the USB/LSB behavior correct? Many thanks, -- Edson, pu1jte, n1vtn, 7n4ncl
Re: [Flexradio] Linux jDttSP
Hi Frank, Thanks for the quick response. Frank Brickle wrote: Edson -- Yipes! I can't thank you enough for pointing this out. We've had a couple of other reports about problems with the spectum output and have been going nuts trying to figure out what was going on, because I have been unable to duplicate the problem. There was a lengthy process of negotiation back and forth between Bob and myself concerning exactly what would go where in the spectrum computation, so that we'd have something that worked on both the Linux and Windows sides. It was my job ultimately to reconcile them in the codebase. Just at the time this was happening there were big problems at SourceForge with updates to CVS that got dropped on the floor. The problem actually pushed me to look into the code to find out how things work. In short, the wrong version (half-corrected) was the one that got into CVS. It was pure sloppiness that I did not go back and test the CVS version that finally showed up. My sincerest apologies. No need for apologies. On the contrary, I would like to thank you and Bob for the superb work you have done. It is quite fun to play with sdr under Linux. I am in the process of implementing a stand-alone little machine based on the VIA EPIA mini-atx mother board and the control application I am implementing is the first piece of a remote controlled SDR-1000 + little DSP-dedicated computer. I'm not going to correct the CVS at this time since, first, you've made the correct fix, and second, because there is a major new release coming out shortly. We're switching to FFTW3 and the code and data structures associated with all those computations are somewhat different. That is very exciting! I am tempted, but am not going to ask for when the release will be! :-) I know how hard it is to get software releases out. Can you tell us a little about the new goodies in the new version? Now, to your questions. [1] *My* Linux version is correct, and yours isn't, because I screwed up. No surprise there. No problem at all. I just wanted to confirm that I was not doing something stupid. [2] The place to get the raw spectrum is not inside jDttSP but rather from the jack ports. If you need it inside jDttSP it can easily be provided, depending on what you're going to do with it. The way it is now does work quite nicely. I was planing a large 4096-pixels panadapter, but instead of scrolling the spectogram image, I can leverage jDttSP to do it for me. I have some old code for a spectogram I wrote some time ago and will adapt it for working with jack. [3] The USB/LSB behavior is exactly as you describe. Switching sidebands is actually accomplished above jDttSP merely by altering the filter settings as you have done. Ok. For TX, would the behavior be the same or would the LSB/USB mode change anything? Thanks again, 73, -- Edson
Re: [Flexradio] Linux jDttSP
Hi Frank, Frank Brickle wrote: One of the things we're eager to find out is whether running the system entirely from ram disk will iron out some of the glitches associated still with using jsdr on a totally vanilla OS configuration, that is, with no low-latency patches, not running jack as root, and so on. This is very much what I am after. On the EPIA mini-atx, I am using an IDE-CF adapter with a 1GB CF card replacing the HD. Last weekend I have installed the base Debian Linux on it. I want to load a RAM disk kernel image from a diferent partition on the CF. For preserving data, I will try using a tiny raw partition on the CF and do direct I/O on the raw device. This would prevent any filesystem-related overhead. I will post the results on the reflector. 73, -- Edson
Re: [Flexradio] Some probably dumb questions.
John, W2AGN wrote: I use Linux 99% of the time, going to Win2000 only for Quicken, and now, PowerSDR. Is there a port of PowerSDR to Linux yet, or is there a comparable program? I tried Linrad with my SR-40, and couldn't get it to go. I use Linux at home 100% of the time. While I must use Windows at work, I just can't stand it. For SDR, I do use Linux with the core dttsp written by Frank and Bob. It works very well, but you need to control it through the command-line interface. I am currently implementing a simple Qt-based graphical shell for controling the core, but it is still in its early infancy and only addresses the receiver side at the moment. I will make it public when I get it into a presentable state. If you like to experiment with Linux, I strongly encourage you to play with dttsp. The dttsp core is a very fine software and works very well with Linux and jack. 73, -- Edson, pu1jte, n1vtn, 7n4ncl
Re: [Flexradio] CAT CONTROL CHECK BOX P3 & P4
As well as a HP42S (my dearest). http://home.planet.nl/~demun000/thomas_projects/free42/ During college time in a final exam day, I forgot my 42S at home. I ran to the bookstore and to my surprise, they had the 42S in stock. It saved the day. I still have both of them and one is here right next to my keyboard. It is one of the most useful tools I ever had. 73, -- Edson richard allen wrote: And for free you can have the classic hp41 running on your windoze desktop and/or your pocketpc. The folks actually use the roms from the real hp41 and wrote a processor to emulate the machine. It therefore works EXACTLY like the original. Great stuff. See them both at http://www.hp41.org Having used HP machines since that day in 1972 when my slide rule went into the desk drawer replaced by the hp-35, I have always carried an HP machine in my shirt pocket where the pocket protecter had been before that. I have found a machine that I like a little better than the hp41 because of it's ability to do math in lots of different number systems including time. It is only $11.85 and has a version for both windoze and pocketpc. See it at http://www.calculator.org . Highly recommended. Enjoy! Richard W5SXD W0UN -- John Brosnahan <[EMAIL PROTECTED]> wrote: (11/05/2005 05:19) At 12:30 AM 11/5/2005, Simon Brown (HB9DRV) wrote: In fact I last bought a calculator in 1987! Time for a new one - http://www.hp.com/calculators/scientific/33s/ ! Simon Brown --- www.hb9drv.ch www.laax.ch Simon-- Looks like a fine piece of hardware, but my collection of older and very expensive HP calculators are all still working quite well. I have found this on-screen calculator to be very handy. It is on my desktop computer as well as my notebook. It is shareware and very inexpensive. You should check out http://www.dreamcalc.com/ It does lots of scientific calculations, plus financial, plus it does a lot of GRAPHING, as well as having a lot of useful scientific constants available. Lots of statistical functions, Base-N and logic functions, and over 630 constants and 80 conversion functions. For a list of features try http://www.dreamcalc.com/calculator_features.htm It works great on complex numbers and does polar plots. I am working on the author to add Smith Chart calculations. Here are some graphing screen shots. http://www.dreamcalc.com/graphing_screenshots.htm I am just a very satisfied customer who got to know the author after making some suggestions. He put in 8,000 hours on the project. It not only can use RPN, but also modern algebraic or classic algebraic entry. The standard edition is only $19.99. And the professional edition is $29.99. All features work in the shareware download and there is no time limit. If you don't pay for the key it will occasionally remind you. It is probably the best value for shareware that I have ever found. 73 John W0UN ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
Re: [Flexradio] Frequency calibration etc
Hi Mark, I have been day dreaming about a sound interface designed specifically for our needs. It could be a USB, Ethernet, or PCI device -- Ehternet being preferrable for its low cost, easy programming, and eletrical isolation. We could have a community developed interface with provisions for external clock or including a disciplined clock. We don't need any of the additional gadgets present in most sound interfaces. Just a simple high quality codec. One of the major advantages of such a device would be to acquire control over the repeatability and reproducibility of results. The Delta-44 browght us a large improvement. We could push the limits even further. 73, -- Edson Mark Amos wrote: You guys have probably already hashed this kind of thing out earlier, but does anyone at Flex have a relationship with the M-Audio people? Maybe we could use that channel to provide clock, sampling and phase noise improvement input directly to them... Of course if the D44 is only a short-term tactical decision this would be a moot point but if they were picked for more than just their currently acceptable card, maybe they'd listen. Mark -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jim Lux Sent: Tuesday, November 22, 2005 5:57 PM To: ecellison; 'John Ackermann N8UR' Cc: FlexRadio@flex-radio.biz Subject: Re: [Flexradio] Frequency calibration etc At 02:16 PM 11/22/2005, ecellison wrote: John Thanks for the input. I have not heard of anyone else using the external reference, and you never noted any severe adverse effects. Is the 5065a keeping the SDR dead on, which is the primary objective in this whole discussion. Do you notice variation due to the Sound card clock? Perhaps all the theory we have been gumming about is not that important in practice. On some "on mobo" sound cards I've tested, typical fractional variations in sample rate are around 2E-3 (that is, for a 48kHz sample rate, the actual sampling was at 48.090 kHz), and varied about 1E-3 over a time span of 2 seconds (that is, it went from 48.077 to 48.115 over that span). This is with a fairly high SNR, so one can really get 1Hz measurement uncertainty with a sample epoch of 100 milliseconds. Over that same 2 second time span, the deviation from a straight line trend was only around 20 ppm (1 sigma). On the other hand, some sound cards are much better: http://www.leapsecond.com/pages/sound-1pps/ Tom Van Baak reports a few tens of ppm accuracy. Several other pages report similar measurements (i.e. <100 ppm) I suspect that there is a wide variability in these things (mine were "on mobo interfaces" operating sitting out in the breeze, and probably a worst case) Jim, W6RMK ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
Re: [Flexradio] Impulse Wave file
Richard, Try ftp.flex-radio.friends.net 73, -- Edson, n1vtn richard allen wrote: C:\sys>ftp ftp.flex-radio-friend.net Unknown host ftp.flex-radio-friend.net. ftp> bye C:\sys>ftp flex-radio-friend.net Unknown host flex-radio-friend.net. ftp> bye What am I doing wrong? I would like to see these. Richard W5SXD Robert McGwier <[EMAIL PROTECTED]> wrote: (11/22/2005 21:22) We have an impulse generator on the RFE. And we have (currently hidden) code to generate a train of pulses. I generated several ten long pulse trains with the RFE impulse generator and made a wave file. The large pop at the end of the file is me disengaging the impulse relay. ftp.flex-radio-friend.net u: Friends p: Flex4U cd upload/N4HY get IQ_impulses.wav Bob -- Laziness is the number one inspiration for ingenuity. Guilty as charged! ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
[Flexradio] Impulse Response
Hello: I will ask this here before diving deep into the DSP books. :-) Given the SDR-1000 impulse response using the internal pulse generator, how could one use the results (a complex FFT) for correcting the IQ phase and magnitude errors in the frequency domain? 73, -- Edson
[Flexradio] Filter in new FFTW3 code
I am testing the new FFTW3 DttSP core windows port made by John and a development version I have received from Frank and Bob and am noticing that the filtering is not as sharp as before in the FFTW2 code. I wander if the difference is related to the size of the FFT used (512 now x 2048 before). Before, the audio of a signal would drop rappidly outside the filter passband. Now it drops very slowly and can still be heard 100 Hz above or below the nominal filter settings. Has anyone observed this phenomenon? 73, -- Edson, n1vtn
Re: [Flexradio] Howcum?
Eric, With all due respect: what a bunch of crap you just wrote. Eric Ellison wrote: Guys Well since I started this, intentionally, and have read all the messages: 1. I did not want it to become a 'mini-flame-war' or battle of the "operating Systems" 2. There is NO question that the FlexRadio Windows console, will now, and until the end of the product life hold the product together. PERIOD! 3. Everyone 'skirted' around the question without really getting to the PRIME reason. "Linux people, because of the nature of Linux, are for the mostpart brilliant loners, insofar as an OS's is concerned." Could you please define "Linux people"? Is it analogous to "white people" or "black people"? Please do not label or put people in the same basket. People, from all over the world may use Linux, or any other OS for that matter, for very different reasons and needs. I use Solaris most of the time, Windows for office work (and hate it), OS X for its excellence and beauty, and Linux for its freedom, ease of programming, and stability. As "Linux people" being loners, a quick search for the word Linux on Google returns 950 million hits. So much for a group of loners. I do agree with the brilliant loners comment, however. I am very thankful to loners like Leif Asbrink, Bob McGwier, and Frank Brickle as they have shared their lonely ideas with the world. Therefore we will probably have "Edson's console" or "Frank's Console", but guys it takes "A town" and it takes compromise. That compromise is forced on you in the form of Bill Gates, and it is what makes the entire product successful. Compromises are a fact of engineering and often the spoiling factor to good ideas and products when the compromises are dictated by marketing and propaganda. IMHO Therefore, that is the answer to my somewhat rhetorical question: There WON'T be a Linux console of any substance for anyone!. For everyone, you are probably right. For anyone, you are probably wrong. John's Java console, DttSP-Shell, or any other Linux console will be of some use for some persons. The OS used successfully is reserved for Corporations who dictate a 'team' effort on a single distribution, and a single platform, and make it invisible to the user. Invisible to the user! This is utopia. Have you ever seen any Personal Computer OS that is invisible to the user? In other words an application, NOT an operating system. If the linux folks would FORGET LINUX and focus on an Application, that would make something we could all work with. Please do not force your ideas onto others. Let people decide what they want to use and do with their computers, radios, and their free time. If what other people are doing does not please you, fine. No one is forcing you to use anything, 4. What IS needed is 'conformity'(doncha just hate it!). A structured 'town'. * One distribution vote and die with it (Shades of Bill!) * Cooperating team members in all phases of software. * Teamspeak coordination. * SVN or CVS (CVS is already there anyone check out the code recently?) * Possibly a separate forum. Let ideas flow, Eric. Diversity and freedom are beautiful things. When the time comes, people will naturally form groups and communities. New ideas may be born. Old ideas may just die. Let people experiment and have fun with what they are doing. Personally as a really positive 'can do' type person I think the answer to this question is YES there CAN be a very viable Linux based console. The Talent is there, the Teamwork sucks. Sucks for whom? You? John's Java console, DttSP-Shell, and DttSP are all open source applications. Interested parties can join the development at any time. Construtive criticisms are very welcome. Bullshit does not contribute to anything. (Dan - I'm dying here! HELP!) R.I.P. I apologize for the rant. I will go back quiet again now. Just for the record, Gerald series of articles and Bob and Frank's DttSP have restored my interest in amateur radio tremendously. For the last two years, I have learned an immense amount of new concepts and ideas. I still know near nothing. There is so much to be learned. So little time. The ride, however, is what matters for me. My wish is that at the end of the day I should have learned something new. 73, -- Edson, pu1jte, n1vtn, 7n4ncl
Re: [Flexradio] [softrock40] FlexSDR Software documentation
Cecil, The same here. We could all contribute using a wiki. Wikipedia anyone? 73, -- Edson John Melton wrote: Cecil, as one of the non-core software developers that has looked at this code and worked out how to interface to the current Linux code I may be able to help with some of this documentation. Let me know where I can be of any help. Regards, John g0orx/n6lyt
Re: [Flexradio] documentation roadmap
Re: [Flexradio] documentation roadmap
Jim, Jim Lux wrote: I've been peering into dttsp. What would be quite useful is if there were a "dictionary" that said what each of the 48 modules generically did. Some are obvious (am_demod), some not so (ovsv). A one or two line description for each one would give you a good idea where to go hunting when you're looking for a particular routine or function. The ovsv() function performs the overlap-and-save method of fast convolution using the FFT. 73, -- Edson
Re: [Flexradio] OK I'll start another 'flamewar"
Eric, We are all here hiding and busy writing code, playing with the code, breaking the code, taking the code apart, rebuilding the code, and thinking about the code. For us, the code "is" the game! How about helping us write some code? Going back hiding again... -- Edson Eric Ellison wrote: Folks Where is the Linux version! (smile) Just kidding! Dan we need a post on your Linux group on Teamspeak! Where ARE you Llinux guys? Post your Teamspeak stuff! Marketing is part of the 'game'! Contributors are the other 10 percent! (smile). It's all fun! Even the grey hairs, many of us notice! Eric ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] Hardware for Linux
Scott, I run DttSP and DttSP-Shell on a 500 MHz PIII Linux desktop running Debian (or Ubuntu). My Window Manager is Openbox. Regards, -- Edson, n1vtn Scott Gordon wrote: > All they talk here recently about hardware needed for dedicated SDR >machine running windoze. What kind of hardware are some of you running >for Linux/Ubuntu? I have not check Flex site to see if they recommend >anything different. I am thinking about putting together another >machine and begin to learn Linux thinking down the road it may be a good >fit for the SDR? What I am looking for doesn't have to be the minimum >but a mid-range pc. > >Will keep reading some of the earlier post here and see where some of >you are at with the SDR on Ubuntu. > >Thanks >Scott >KQ8RP >http://www.kq8rp.us > > >-- next part -- >An HTML attachment was scrubbed... >URL: >/pipermail/flexradio_flex-radio.biz/attachments/20060720/6a1d951b/attachment.html > >___ >FlexRadio mailing list >FlexRadio@flex-radio.biz >http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >FlexRadio Homepage: http://www.flex-radio.com > > > ___ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
Re: [Flexradio] On-Line RX for signal evaluation? (Was: Hey Bob - IQ DC offset hooks)
Jerry, What you have described is similar to the 40m spectrometer I've built almost 2 years ago. http://201.91.65.226/qrpbr/ 73, -- Edson, pu1jte, n1vtn Jerry Flanders wrote: >At 20:32 11/4/2006, somebody wrote: >... > > >>>I see this as a major tool. >>> >>> >>It would be. Sort of like an inverse DX Beacon system. >> >>There are some issues one would need to resolve to make it really useful: >>Control interface (doesn't need to be too fancy.. frequency and >>attenuation is about it) >> >> > >No - no interface. The thing simply makes available the last minute's >I/Q file. You have to know where it listens, of course, but it never >moves, and can be used at any time by any person knowing how, and the >know-how is easy to distribute. > > > > >> The interface needs to have some sort of scheme to allow a person >>to get control for some reasonable time, but also to avoid >>hogging. A lot of the "web controllable" cameras have some sort of >>mechanism for this. >> >> > >No - nothing like that at all. Anybody and everybody can download the >file within that hour - no hogging - no control. > > > > >>Calibration (either the oscillator has to be stable or externally >>derived, OR, you need good markers that are inband to compare >>to). Both the LO frequency and the sample rate need to be calibrated. >> >> > >I believe an ordinary RX of crystal-controlled softrock quality will >do the job. calibrate it if you wish. I had no calibration data with >N9VV's "RTTY contest" file, but found it extemely useful. > >Lastly, I think this could be a booster for PowerSDR / SDR in general >when the "public" learns how to use it and sees how neat SDR is. > >Jerry W4UK > > > > > >>> >>>At 19:38 11/4/2006, Jim Lux wrote: >>> >>> At 10:53 AM 11/4/2006, Jerry Flanders wrote: >Looks like audio only - Unless I am missing something on this site, >this is not at all what I am talking about. > >Anybody else see the utility of having a distantly recorded I/Q file >of your own sigs to evaluate your TX quality? > > There are a few PCR1000's around the world that are web accessible. You can set it for wide band, tune it off your signal, and record the audio stream on *your* computer and then post process with any of a bunch of programs. I like DL4YHF's program, but any >>>should work. >>> >>> I suspect the online SoftRock40 would also work. We looked into doing something like this at JPLARC, in connection with doing the FMT, but we couldn't figure out a "good" way to do the spectrograms on the server and then serve them. Since we have a hydrogen maser distributed around the lab, we figured we could also put a really, really accurate marker into the receiver as well, so you could do "transmitted frequency accuracy" testing. >At 16:19 11/4/2006, Ken - N9VV wrote: > > >>Here you go: SoftRock40 online >> http://pa3ang.nl/index.php?php=sdr >>de ken n9vv >> >> >>Jerry Flanders wrote: >> >> >>>At 14:23 11/4/2006, you wrote: >>> >>> At 03:15 PM 11/3/2006, Gerald Youngblood wrote: >>>It could be a simple Softrock40 if a 48 KHz freq slice could be >>>found that allows all modes. >>>Jerry W4UK >>> >>> >___ >FlexRadio mailing list >FlexRadio@flex-radio.biz >http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >FlexRadio Homepage: http://www.flex-radio.com > > James Lux, P.E. Spacecraft Radio Frequency Subsystems Group Flight Communications Systems Section Jet Propulsion Laboratory, Mail Stop 161-213 4800 Oak Grove Drive Pasadena CA 91109 tel: (818)354-2075 fax: (818)393-6875 >>>___ >>>FlexRadio mailing list >>>FlexRadio@flex-radio.biz >>>http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >>>Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >>>FlexRadio Homepage: http://www.flex-radio.com >>> >>> >>James Lux, P.E. >>Spacecraft Radio Frequency Subsystems Group >>Flight Communications Systems Section >>Jet Propulsion Laboratory, Mail Stop 161-213 >>4800 Oak Grove Drive >>Pasadena CA 91109 >>tel: (818)354-2075 >>fax: (818)393-6875 >> >> > > >___ >FlexRadio mailing list >FlexRadio@flex-radio.biz >http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >FlexRadio Homepage: http://www.flex-radio.com > > > ___
