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Hi everyone, me too have the "problem". My QMX dont transmit using the cat. Someone knows if this issue are fixed? (the famous two spots) thx 73

I just tried FT8CN <-> QMX via USB connection and CAT PTT and everything works fine except for the fact that the audio output level seems to be too low.

So the QMX actually will enter transmit mode, but only shows the two dots in the display which clearly indicates that the received audio signal level is not high enough for proper detection of the AFSK signal, so no carrier will be transmitted.

I did increase FT8CN signal level to 100% already and also tried 16bits / 32bits and all 3 sampling rates (12, 24, 48kHz), but no success.

73, Andreas, DM7AK

PS: got it resolved by not only putting FT8CN internal signal level to max but also Android global audio volume via volume buttons!

Were you able to transmit more than once? When I have all volume at max, it will transmit one time, then back to two dots indicating low volume output.

I have no issues transmitting more than once.

Good for you. In my case, im try in two phones, and dont work. I hope hans fix this bug soon. ??

I think it could as well be a bug of FT8CN or Android operating system...

Some phones limit audio levels to protect ears.

And some phones have software DSP filtering to "enhance" audio output signals.

Both mechanisms could be accidentally applied to USB audio output as well.....

Discussions on other places online indicate that this isn't an issue on the QDX, so it is possible that there is a software fix that would solve the issue. Otherwise, does anyone know how to get Android to output the correct audio level? I have search the settings and developer settings without luck. I also have a rooted phone I could try, but I don't know where to begin because I don't know what is causing the issue.

I'm having the issue as well.

• Wsjt-x on Windows with qmx works fine
• Wsjt-x on rpi with qmx works
• Ft8cn with kx3 works

I've got both the android system volume and the ft8cn volume up to 100%.

I have not tried a second android device yet.?

Here's the important clue. On wsjt-x with rpi one can select L, R, mono or both. L works but R doesn't.?

I suspect ft8cn is using the right channel and qmx uses the left. Probably either could resolve it by using both channels. I've made minor PRs to the ft8cn code before (not yet accepted) so perhaps I'll look into this. But it seems possible Hans might be able to address it as well.?

In other post i can read... "Versions after 1.06 firmware dont work with FT8CN".... If this its true, i think the problem is in the new firmware. But im try now if change the left or right speaker works. ?

Finally W O R K S... AYUUUUUU
For me works with this settings in my phone:
Audio..... Mono
Audio balance..... Totally left

And...... Voilà

A 14,074,00 di - - -? ? ? 11
-? ? ? ? ? ? ? ? ? ?gi.? ? ? ? ? ? ?.....?
??????

Thank you Angel, that did make a big difference for me, but I am still running into transmits where I am getting the two dots under the 'A' and no output. I suspect that the ultimate fix is in software.

For additional information, I get about 4 transmits before the two dots and then it may transmit again a few cycles later, but I don't see any sort of pattern to it.

In my case, not only the dash under de "A", three dash at right of "di", like when i use jtdx. A full. Tomorrow try with other phone and a tablet. ??

I gave up with FT8CN.
?Philip G7JUR

It works for me.? I had to set the audio levels lower in the QMX, 60% and 50% IIRC

I had the same problem. Put ferrite clip on chokes on USB leads at both ends of USB leads fixed my problem. Works for Win and Rpi now.?