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Nice, good sluething so far.? I agree with your assessment.? Hopefully the fault is easy to find now. For 20m, the band select should be set for filter "3", which is B4 or pin 1 on IC408.? So that

Hi George, all Should be noted that CESSB does not introduce distortion or splatter. Compression does introduce distortion (though still not splatter), including in-band audio harmonic content.

Stan, signal present at BNC, pin 5 IC408 and not present at pin9 IC402. The signal is also present on pins 1&2 IC408 but not on pins 3,4, 12 thru 15. The signal pins 1&2 IC408 are same phase. The

I see it on a QMX+ I haven't yet updated with the SSB beta, maybe with a bit lower amplitude; are you sure it wasn't there before?

I didn't notice it in digi mode before the SSB beta. -- 73, Dan - W2DLC

There is plenty of room in the QMX+ on the development board for the best solution in QRP SSB mode, which is neither compression or CESSB but rather linear amplification, a tried and true solution. It

I hear mine most on LSB. The sound changes on USB, and it's an on and off tone that repeats. I can hear them from 17 meters to 6 meters, and strongest on 12 meters. They seem to have gotten

I'm just wondering if they might be the reason it seems "deaf" on MSK144 mode, since there is a birdie right at 1500 which is the center of DF frequency in MSK144..

This is also happening on my QMX+ in Digi mode into WSJT-x. So it should have nothing to do with AGC or with the SSB update - ?the SSB firmware should not have changed the Digi signal path, excepting

Something that may be relevant was that I found that my QMX+ needed to have the Rise Threshold reduced to 60 to start transmitting. I then found that it would only transmit for a few seconds. I found

So that eliminates the power supply as the source of interference. -- 73, Dan - W2DLC

Stan, thank you for sticking with me on this. I'd reflowed 7 of the 11 pins and the last 4 were apparently where the problem was. I was reading the schematic incorrectly perhaps, because I thought I

Hi This might be interesting for you too https://qrp-labs.com/vfo.html 73 DE muhsin TA1MHS

I'm trying to use an IC-705 microphone which from the specification should be suitable as it uses a 3.3V supply.? The problem is the male connector on it uses 4 poles.? From the tip these

Hi, I’ve just finished my QMX rev 4 build. Unfortunately I get in the diagnostics with PTT signal: —ON— and rf output: off a Bias Smps current of only 4.5mA. Running it with output ON I get a

Azgael, Your fix is not quite what you think. You did indeed connect the Source of Q102 o the input of IC101. But the schematic connects the Drain of Q102 to IC101 input. What you did is bypass the

Mark here, from SOTA+ Thanks for sharing the live link! Surprisingly, the 10 GHz QSO with the QMX as the IF radio actually worked! If you tune in at ~15 minutes, Devin W6DVN shows off the system and

I have a Pyramid PS9KX 13.8V 5A supply that I am currently feeding through a 12V buck converter to keep it at 12.0V. I have also tried with my station supply (JetStream JTPS31MA) adjusted to 12V

Erik, My QMX+ began having similar, though not exact symptoms after a lot of experimenting with configuring in the new beta SSB firmware. I don't know the cause yet, but, out of curiosity, how are you

Bill, N4QA/QRP <wb4hio@...> updated the photo album QMX-PLUS-FT8-OKI ( /g/QRPLabs/album?id=301573 ) : QMX-PLUS-FT8-OKI