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--- In softrock40@..., w keith griffith <kgriffit@w...> wrote: > > I have,,, 'SomeWhere' a really good description of the Weaver ssb > method. There's a decent description of the Weaver method in the DSP section of all the recent ARRL Handbooks. > How, if at all, does that method compare with the > softrock? The SoftRock itself does no demodulation. All it does is sample the incoming signal in such a way as to mix down to 11250Hz. The downconverted signal is then dumped to the computer's soundcard. In the subsequent software DSP on the digitized signal, the SSB "demodulation" consists entirely of a bandpass filtering stage and another mixing stage to spin the signal centered at 11025Hz down to 0Hz. CW is the same, except the mixing stage spins the signal down to the CW offset frequency (700Hz or whatever) rather than 0Hz. 73 Frank AB2KT

First I would like to say how impressed I have been with the little SoftRock40 and the PowerSDR software. It has been a long time since I have worked HF and this has really got me interested again. Thanks to everyone who has put this together. I have been thinking about putting the SoftRock40 on the internet with a simple server reading the I/Q signals and serving them to clients that connect (limited by my uplink speed). What is interesting about this is that each client can then independently tune across the passband of the receiver. Imagine a whole network of these little receivers around the world. Want to check out the conditions on 40 Mtrs in Europe - just connect to one in Europe and tune around! I am a Unix/Linux/Java software engineer by profession and have good development systems for these environments. I do not have any Microsoft development systems - note the email address ;-). I have downloaded the Linux code and am currently working on this to use a socket connection to receive the I/Q data, and also looking at implementing a GUI interface - possibly in Java. Would anyone be interested in helping with this development? In particular I would be looking for someone that would be prepared to look at the PowerSDR Windows code to modify it to get the audio data from a socket rather than the audio device or a Wave file. let me know what you think and if you can be of any help. Regards, John Melton, g0orx/n6lyt

Hello everyone. In keeping with my inability to leave well enough alone, I have modified a SoftRock for use on 80m. The input filter and transformer have been changed to allow operation at 3.5Mhz. Essentially, I just doubled the value of all the original parts, and recalculated the windings for T1 to maintain the proper impedance matching. I breadboarded the revised input filter on a piece of perfboard. I used T37-2 cores to wind the inductors and transformer. Due to the number of windings on L2 and T1, 30 guage wire was used. If molded inductors are used for L1 and L2, the new filter could fit in the original position on the SoftRock board. A local oscillator crystal at 14.318Mhz yeilds a net center frequency of about 3.579. This nicely covers the QRP CW frequency range. A LO crystal of 15.75 Mhz allows tuning around the upper portion of 80m, for SSB receiving. I have posted three pictures in the N1RX photo folder showing the changes. It seems to be working well here. Several SSB stations are being heard at similar levels to my Elecraft K2. I'm waiting for dark here to give the CW portion of the band a serious listen. How much fun can YOU have with a $23.00 radio? -Bruce, N1RX

For those interested, I found the link below to free evaluation software for the Microsoft C# compiler. It's a large download (289 Megs) and some of the software only works until May 2006, other parts work for a period of 1 year. Maybe some of the developers can chime in and mention as to whether it will be useful in re-compiling the software for the SR-40, if not it's a free learning tool. The real thing is very expensive, unless you buy a student version at a university. < http://lab.msdn.microsoft.com/express/vcsharp/default.aspx > Enjoy. Cecil Bayona KD5NWA www.qrpradio.com I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...

Hi, I was googling to find a list of interesting frequencies to listen to on 40m. Could anyone show me a list? Frank

Hello everyone. I have been able to aquire a large quantity of the 40.500Mhz fundamental-mode crystals required to move the SoftRock-40 to 30 meters. After completely selling out of the original 100 I had, I was able to obtain several hundred more. This means that there are now enough for ALL SoftRock owners (including those with pre-AmQRP kits) to have on-hand a crystal or two for 30m. Due to the large quantity purchased, I am able to maintain the same price. (just recouping some of the expenses.) If you are interested, you may order using the instructions below. PayPal, or a check to my address listed at QRZ.com is OK. Just drop me an email if you are sending payment through the mail, so I can reserve crystals for you. 73, Bruce, N1RX -----Original Message----- From: Bruce Beford [mailto:bruce.beford@...] Sent: Saturday, September 24, 2005 6:57 PM Subject: SoftRock40 on 30M- Success! Crystals available now. Hello all. I have successfully converted a SoftRock40 for use on 30M. Two capacitors need to be changed from their original values, and a new oscillator crystal installed. Capacitors C6 and C7 (ver. 4.0 designators) are changed from their original 100pF to 33pF. The crystal is changed from its original 28.224 to 40.500 Mhz. The original crystal still works with the new capacitor values (in two units here). (I had tried this before, and didn't think it worked, but my experiment was flawed. It is working now.) I have available a quantity of the 40.500 Mhz crystals required. These allow nearly full coverage of the Amateur 30M band with the SoftRock receiver. As I announced earlier, I am making these available to all. The price for US delivery is $2.00 for one crystal, $1.50 each for quantities of two or more. For foreign addresses (including Canada) the price is $2.50 for one, $2.00 each for two and up. You may send payment via PayPal to bruce.beford@... I will fill orders on a first-come, first served basis. Any questions? Email me direct, and I'll answer as best I can. 73, Bruce N1RX

Our kitting team lead reports that 270 of the SoftRock-40 Kits for Round 2 are now in the mail. The remaining 130 are waiting on the final semiconductor sub-bag of parts coming from the kitter, expected any day, and we'll likely ship the last of the kits later this week. Thanks for everyone's patience on our scramble to get this second round of kits out - what a great little receiver with great big results! 73, George N2APB http://www.amqrp.org/kits/softrock40

Good Morning everyone. I have posted two more photos to the N1RX folder. These show the "noise spike" at the center frequency of a SoftRock-40. One shows the spectra obtained when the SR-40 is powered in the original fashion, from the USB port of the computer. This uses the original Q1 power filter circuit. The second photo shows the EXACT SAME SR- 40, powered by bringing in external 5v, derived from a battery supply, using a 78L05 regulator. In both cases, the radio is operating on 40M, connected to a dipole antenna. The only change between the two was to unplug the card from the USB port, and connect the external power source using a couple of clip leads. It is clear that better performance can be obtained by using a seperate source of power for the SoftRock. For details on how to modify the SoftRock for non-computer power, see the appropriate photos in the N1RX folder. 73, Bruce N1RX

Good Morning everyone. I have posted two more photos to the N1RX folder. These show the "noise spike" at the center frequency of a SoftRock-40. One shows the spectra obtained when the SR-40 is powered in the original fashion, from the USB port of the computer. This uses the original Q1 power filter circuit. The second photo shows the EXACT SAME SR- 40, powered by bringing in external 5v, derived from a battery supply, using a 78L05 regulator. In both cases, the radio is operating on 40M, connected to a dipole antenna. The only change between the two was to unplug the card from the USB port, and connect the external power source using a couple of clip leads. It is clear that better performance can be obtained by using a seperate source of power for the SoftRock. For details on how to modify the SoftRock for non-computer power, see the appropriate photos in the N1RX folder. 73, Bruce N1RX

Of course, the original and a copy showed up as soon as I reposted. Sorry for the inconvenience. -Bruce.

Very sorry if you missed out on one of the SoftRock40 partial kits but they are all spoken for at this point. Thanks for your interest. 73, Tony KB9YIG

While looking for crystals for the SR-40, I'm considering buying some Epson SG-8002 Programmable Oscillators the 50ppm type so I can dial the frequency I need that are not available in crystals. They are about $5.15 each I'm a little concerned with clock jitter (phase noise), does anyone have any experience with these chips? Cecil Bayona KD5NWA www.qrpradio.com 'Never argue with an idiot. They drag you down to their level then beat you with experience.'

Hi Cecil, I would recommend steering clear of these programmable oscillators for any RF type work. The jitter is much too great for good RF performance. 73, - Steve N7HPR

I have been unable to run Flex Radio's Power SDR on my windows ME system. The program starts to initialize but stops and hangs while initializing the dsp function. A while back some one else on the list reported the same problem on a windows 95 system. I2PHD has another SDR program that seems to work fine with the SR40. This program is available for free download at http://www.sdradio.org/. The download is less than a meg and worked as soon as I plugged the SR40 into the mike input of the soundcard rather than line-in. I2PHD's program works fine with windows ME and may work with 95 too. It's worth a try. 73, Nick Brown AB0WE

Tony, Got the board back in the mail today. Nice job and thanks much. Need to get busy and stuff the rest of the parts. Chuck Carpenter, W5USJ, Point, TX -|- Rains Co. -|- EM22cv -|- 72 es 73 50 years -|- 19 - K2OFN and 31 - W5USJ -|- Most fun = QRP since 1984. www.w5usj.com hosted by Hamnutz.com -|- NeTxQRP www.netxqrp.com

Completed assembly several days ago. Currently Using I2PHD's http://www.sdradio.org/ program which I had already installed on my PC for experimenting with the R2PRO. Was able to get at least 50dB of image rejection by carefully adjusting the amplitude and time delay settings in the program's control panel. Thanks to all involved for this interesting project 73, Bob Johansen WB2SRF

Apparently, my last message on this got lost in the server somehwere. I have uploaded two new photos to the N1RX folder that show the difference between powering the SoftRock from the USB port vs using a battery powered supply. Both photos show the central noise spike from an SR-40 connected to a dipole antenna. The only difference between the two photos are the source of power. In the first, the SR-40 is powered by the USB port, using the standard Q1 power conditioner. In the second, the SAME SR- 40 is now powered by a 78L05 voltage regulator, driven by a battery. Notice the difference in the width of the central noise spike. Better performance from the SR-40 can be obtained by running from a power source OTHER than the USB port on the computer. Battery power is best. For details on how to modify the SoftRock to use non- computer power, see the other photos in the N1RX folder. 73, Bruce N1RX

With all the excitement about the SR40 on 40m and 30m .....maybe 80m and 60m and keeping it simple ....pluggable bandswitching, etc ....I'm thinking laptop, QRP CW operation in the field. How much can you reduce the computer load/requirement and still have acceptable performance. What have you guys tried and had success using ? 73 Kees K5BCQ

Are any other C# platforms being successfully used to compile the Flex software other that MS Visual Studio ? What about ; Mono Grasshopper C#Builder ?? Cecil Bayona KD5NWA www.qrpradio.com I fail to see why doing the same thing over and over and getting the same results every time is insanity: I've almost proved it isn't; only a few more tests now and I'm sure results will differ this time ...

Hello All, I'm trying to install the PowerSDR software and the following Fatal Error dialog box pops up behind the splash screen: Interop.ADOX or one of its dependencies was not found at PowerSDR.DB.Create() at PowerSDR.DB.Init() at PowerSDR.Console..ctor(String[] args) at PowerSDR.Console.Main(String[] args) Any ideas as to how to deal with this problem? The software had been previously installed and working, but an issue arose and I needed to uninstall it and now am trying to reinstall... Thanks, Bob - KI8JM