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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

Forgive me if this has been already asked, but I cannot seem to find the answer. My QMX+ is showing some signal every 500Hz in USB mode (and in DIGI mode) on RX. I hear it in the headphones as a light

If the audio seems poor, check using the microphone test screen, whether or not you have enough sensiricity from your particular microphone. If you have to then up the gain too much then you will be

Bonjour Pierre, after building several QRP Labs kits I started building the QMX+. I'm 84 with good eyesight and steady hands. It is more of a challenge than their other products that I have built. I