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Hi Lucien Sounds to me like the "time of day" on the U3S is not being set / or/ not set accurat >>plus/minus two seconds<< ?WWV / ZULU 72 73 John N3AAZ

Found the problem! I was ready to send the thing to Jeff, W1NC to get his genius to work its magic to FIX this nightmare. He said he always does a close inspection with magnification before he sets

Hi Scott, as others have said, you can test the boards without the processor controlling them. I would find out which diode is missing and then replace it. I have three QMX, and two of them have

Are you trying to send wspr or qrss? Looks like qrss. Andy -- The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.

Nobody, including me can decode my WSPR signals on LF/MF and HF when I tx using 1) A U3S beacon and 2) A home made circuit based on an Arduino. Both transmitters used to get decoded OK. I have tested

Dummy load is the simplest answer I've found. -- 72 de N4REE, Bob Easton - QRP CW forever

I can hear the approx 1khz tone on all bands of my QMX+ v1. Loudest on 12M and 6M, but to varying degree on all others. Barely perceptible on 160M, but there. It is not a 100% constant tone, there are

make that an 1804 ?

Hello Chuck Did you try changing the other parameters other than AGC threshold? I will look into it again when I have a chance; it has been a while since the AGC functionality was added and I get

Hi Dan,thanks for the suggestion, I will indeed try that next. Hans diagnostic tools are great help with this sort of problem. While waiting for firmware to fix 160m problem is the bandpass filter

There is a lot of useful information on this in the Wiki - see Left Menu. I was able to test mine after my first QMX expired. Rod

I confirm that nothing should be writing to the '5351 during receive. Even during transmit, nothing should be causing interruptions at 100Hz. Makes no sense... I would suspect the '5351 chip... 73

Adam, I think Jerry is on to something here. If I recall, Hans runs the I2C programming at 1 MHZ so your 200 is gap sounds like 200 bits are being written at an unwanted time and the 5351 stops clock

Don, I re-read your previous post and realized that you were working a problem where you did not have Vdd.? In that case I understand why the USB interface might not work.? Apologies for the

Hello I have recently built a Rev 2 QMX+, for 9V. I am attempting initial power up with a 9V battery to see if LCD turns on or if I can update the firmware. I see neither the LCD screen go on, or

I was able to go from 0.6 watts on 6 meters to 2.6 watts by removing turns from L520, the toroid closer to the antenna.? I ended up removing 4 turns, but you will want to do this one turn at a time,

Charles Could it be your antenna is better on 40m? Could also be stronger signals then on 40m. Try this. Find a spot on each band with no signals. See how the noise level varies across the

Don, Not sure why VDD would not be there with 9V applied to the input plug.? It works fine with only the control board plugged in and push on the left encoder to turn it on.? Then the USB port

I have a huge increase in volume on 40 meters.? On transmit, I seem to have pretty consistent output across the band.? Is there any particular reason 40m would be maybe 10 dB louder than any other

I wish to add my high praise and deep respect for Jeff Moore,? the skilled EE and repair wizard who's come to the rescue of so many of us kit builders with seeming impossible-to-fix radios. A recent