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Hi, Building the U3s with 5w amp, no rf output so stripped the amp out of system and base U3s works. The 5w amp biased up ok but still no output so I checked the resistor placement with a Dvm, R2 is

Dear QRPLabs Members, In my last message I invited all QRSS and WSPR stations to join the Las Cruces QRSS Mafia to operate with us on New Year's Eve. Well, today is December 9th and we have

Would be quite interested in the info too John

Looking good Bob...lots of sunlight to play with there :) Going to be an interesting flight. Jim,N2NXZ

Thanks Hans and Hajo. I was coming at it from a different angle. Some time ago, I used the WSPRcode.exe utility from the WSPR website to convert fixed TX messages into the required tone sequences.

Very cool Bob. If you have some info on it I would like to work on something similar with my kid to get her interested in the hobby. 73 Don Meyerhoff WA2SWX [email protected]> wrote:

P.S... another tip... Don't believe the websites which quote K1JT saying the tone spacing is 12000 / 2048. And symbol duration is the inverse of that. No... Believe the websites which quote K1JT

And good luck... hoping that you know: 1) C language 2) Fortran language 3) how to disentangle a large pile of spaghetti I'm still working on at least 2 out of 3 of these... :-/ 73 Hans

Hi Brian, grab the source code at the bottom of the page: https://physics.princeton.edu/pulsar/k1jt/wsjtx.html 73 de Hajo DL1SDZ Gruss Hajo --- Cela est bien dit, mais il faut cultiver notre

Hi all, This is a bit off topic as Hans does such a fantastic job with his QRPLabs products but .....does anyone know where to find information on the FT8 protocol in sufficient detail to serve as a

Hi Des Yes I think it is possible. If the I-Q pot has to compensate for usual amplitude imbalances but additionally has the trauma of having to deal with the additional imbalance caused by the

Hi Hans and thanks for swift the reply, Would R19 & R25 being reversed on the PCB possibly cause one of the I/Q trim-pots to run out of adjustment while setting-up the I/Q balance? I just checked my

Bob, I've used a 'Connor Winfield D75F-027.0M' ? TCXO in two U3Ss as it has an analogue feedback loop - avoiding jumps.? Suggested by another poster on the group some months ago. I haven't done

Jan, Attached shows my Epson 26MHz, about the same size. "Dead bug". It is on an earlier board without the TCXO pads but it is probably easier without using them. 73 Alan G4ZFQ

I would like to say thanks to those who suggested I RTFM. I just did... Menu 8.5 Ref frq default is 27,004,000. So once I figured out which way to go I found my actual oscillation is 27,004,750.

Jan is right.? Use the instructions in the manual.? I was able to bring mine right on frequency in just a few minutes.? 73/72, Dean K5DH 20m QCX msn 612

Thanks Jan (sorry for writing "Ian" last time, I didn't have my glasses on), The QRP-Labs board really suits something about 5mm x 3mm, but anything is possible with some fine

Thanks Have you looked at the? Abracon ASTX-H11-27.000MHZ-T It is supposed not to jump in frequency, it is used on the etherkit.com SI5351 breakout board. It is very tiny don't know if it is

Thanks Ian, It is a, ECS-TXO-5032 27 MHz TCXO (from Mouser). It jumps like the FOX does. I have another type which will go on the next flight ... when tested on the bench it seems

Nice work Bob. Are you using the?FOX924B-27.000 TXCO ? If so, any problem with the TXCO doing frequency jumps. Will be interesting to see where your flight ends up. 73 Jan SM7ETW