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Thanks Alvey, this is very useful info. I was also thinking abt the "preselector" for the front-end ;) glad to learn from Hans that he is willing to modify the software :)

I get the point Hans and makes sense. But... tinkerers always pushing the envelope :) I was considering 17 and 20 taking into account the monoband ethos of the QCX because these bands are close. What

73 Ondrej OM4DW

Problem with encoder - try to check voltage at pin AVCC of ATmega. It should be close to 5V. After "Unreliable microcontroller start-up" modification, I had only 4,6V on AVCC that caused bad decoding

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