Dear QRP Labs Members and owners of a U3S, I was on Scott’s QRSS Plus site (http://www.swharden.com/qrss/plus/ ) the other evening and there were 55 QRSS Grabbers on various frequencies listed, all re

Have my 40m QCX ordered and am waiting (somewhat) patiently for the status to switch from "complete" to "shipped", but in the mean time I want to ask a tool question from other builders. What is your

Hello, drowned by too much information you sometimes miss the goodies: But Soldersmoke pointed into the right direction: http://hanssummers.com/k6lha-design-book.html 73 de Hajo dl1sdz --- Cela est bi

Hi ¡ I know that there are already lots of post about but I have been reading quite a lot these days and Im still not able to find out what happen with my U3S. I have been playing during few days with

I just completed my qcx kit it looks great. I connected the power to it but cannot get any light to come on the display. I have checked and I have power on the board but don't know what to check next.

For the record, I am retired going on 75yrs old and not affiliated with any businesses and giving my two cents about the QCX transceiver. I have built lots of kits but not one as nice as my 40M QCX. I

Hi All I hope its ok to ask via the group but does anyone in the UK have a GPS module that they don’t want or use, if so let me know your price please, looking for one to setup with my 20m QCX, fed up

I am trying to determine whether the VFO/SigGen would be a worthwhile upgrade to several crystal oscillators and one inferior TCXO in my station. I have a few questions. Has anyone measured accuracy o

Hi all For alignment of the Band Pass Filter (two trimmer capacitors need adjusting, per band) - the forthcoming QSX includes its own kind-of built-in spectrum analyzer with tracking generator facilit

On 2018-12-13 18:58-0000, m5fra2 via Groups.Io wrote: > See http://www.m5fra.org.uk/home-construction/qcx-transceiver-build/ So, I'm having issues with mine (and I'm a bit of a newbie) and one of the

Hello, I was wondering how feasible it would be to implement a crude antenna analyzer in the QCX transceiver. It already has a SI5351 onboard and an exposed RF input, so it should be mostly a matter o

Dear U3S whisperer, I bought a U3S with the intention to increase 2m WSPR-activity, which is incomprehensibly low worldwide :-) I assembled the U3S-box and tested it initially on shortwave. The WSPR-s

For overly sensitive contrast adjustment the assembly manual suggests either 220k ohms or a jumper at R4. Strikes me as a pretty wide difference. Happens I don't have any 220k resistors, are other val

[Apologies if this appears twice--I've waited many hours for this second post to show...] Hello everyone, Previously I posted to the list how I had had no audio output due to my potentiometer being ti

Does the GPS correct the reference frequency in a U3s? I noticed my frequency drifting a bit in WSPR reports with the standard 27 Mhz crystal board. Yes I do park at 150 Mhz. The main reason I bought

Even if Si5351A is replaced, it becomes "si5351 ERROR".Why?

Completed the kit and powered up No smoke Display lit up All controls functioned Heard noise in earphones Only thing weird – Bottom row of display had a bunch of “T” across the row. Sometimes an “*” I

My new unit, on 630M, seems to drop about 30% power during the WSPR transmit period into a dummy load. The final is a single 170. Peak power during calibration is 800mw but I reduced to 700. I suspect

hi group, i have a U3 which i use for wspr since a couple of years. Works flawness no problems at all. For a fellow ham i build a U3S but untill now i’m not satisfied at all. I measured the output fre

A couple of shots showing the FOX TCXO looking at the 27MHz output. One shows the first 2 minutes of warmup from initial switch-on. The other shows it warm but dithering, up/down a Hz or so, seemingly