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QMX and fldigi, VARA? #qmx #fldigi #VARA

 

Hello,
is there a known setup for RTTY using fldigi and VARA setup?
I have had success with JS8Call, although TX signal required unusually high level setting (around -1? to -2 dB, while with TS-590S or G90 it was somewhere in the range -17 dB or lower) - but I suppose the higher the input level the lower the risk of including unwanted noise in the transmitted signal).
However, with VARA and FLdigi I had no TX output. FLdigi uses flrig to control the transceiver (which is perfectly OK), when I switch to TX it seems QMX is switched, too (sound in headphones disappear) but there is no output even when I set transmit level to 0 dB.
Is there anything else I need to pay attention to?
73 Jindra OK4RM
 

On 02/01/2024 10:25, ok4rm wrote:
However, with VARA and FLdigi I had no TX output.
Jindra,

/g/QRPLabs/message/113858?p=%2C%2C%2C20%2C0%2C0%2C0%3A%3ACreated%2C%2C%23vara%2C20%2C2%2C0%2C102685272

Note the QMX is presently using a completely different system to the TS-590 and other rigs. Audio has to set to maximum, 0dB.

73 Alan G4ZFQ
 

VARA cannot work with the QMX as it is not one tone at a time. RTTY should be OK.
Gary
W9TD
 

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Jindra,

At the moment the QMX will not work with fldigi. There is an issue that was created when firmware 007 was released that prevents it from working. Hans is aware of this and hopes to resolve it.

73,
Cliff, AE5ZA



On Jan 2, 2024, at 04:25, ok4rm <radio.miskovice@...> wrote:

Hello,
is there a known setup for RTTY using fldigi and VARA setup?
I have had success with JS8Call, although TX signal required unusually high level setting (around -1? to -2 dB, while with TS-590S or G90 it was somewhere in the range -17 dB or lower) - but I suppose the higher the input level the lower the risk of including unwanted noise in the transmitted signal).
However, with VARA and FLdigi I had no TX output. FLdigi uses flrig to control the transceiver (which is perfectly OK), when I switch to TX it seems QMX is switched, too (sound in headphones disappear) but there is no output even when I set transmit level to 0 dB.
Is there anything else I need to pay attention to?
73 Jindra OK4RM

 

Let me put the question another way. If I switch QMX to digi mode (should be SSB mode, but it is not yet implemented), connect sound generator and PTT switch to microphone input, would I be able to send RTTY? Not that RTTY were a must-have, I would like to be able to respond to RTTY CQ occasionally, nothing more. If it can't work, it is fine. I just can't see principal difference between JS8Call and fldigi if both send some audio to USB audio device and both (I assume) send TX command via CAT, and that makes me curious :)
 

?
Let me put the question another way. If I switch QMX to digi mode (should be SSB mode, but it is not yet implemented), connect sound generator and PTT switch to microphone input, would I be able to send RTTY? Not that RTTY were a must-have, I would like to be able to respond to RTTY CQ occasionally, nothing more. If it can't work, it is fine. I just can't see principal difference between JS8Call and fldigi if both send some audio to USB audio device and both (I assume) send TX command via CAT, and that makes me curious :)

In QDX and QMX digi mode operation is implemented in a specific way. The PC emits a tone which it sends to QMX via the USB Soundcard interface. QMX measures the duration of one audio cycle of the tone by looking at the zero crossings and measuring the time elapsed between them. It does some averaging to improve the situation. Then it updates the 5351-synthesized frequency to this Audio Frequency plus the current VFO frequency of the QMX. You might therefore think that any audio sent to the QMX will be transmitted. However there are limitations:

1) QMX can only produce a single carrier frequency. Therefore the program giving it audio needs to be generating a single tone FSK mode. Not just any combination of audio tones which VARA would do. Nor can it do phase shift modes because in the frequency domain these also equate to multiple tones.?

2) QMX applies some averaging to the audio frequency measurement; by default it is set up to measure and update the 5351 synth 100 times per second. If you wish to do faster modes such as RTTY then this needs to be adjusted, in the configuration parameters.?

So yes, you can do RTTY! But you will need to adjust some parameters. See also? for notes on QDX RTTY by?Peter G3SPL.

73 Hans G0UPL
 

This is not correct
The QDX (and im assuming the QMX supports the same FSK system) WILL DO VARA

THE QDX WILL DO VARA!!

The caveat is it can only transmit speeds 1-3 (500hz) and 1-4 (2300/2750hz)

I just sent a winlink mail with my QDX:? 3,142 Bytes 4:02 Bytes/Minute 779
Magnus
 

I've got the qmx to work with fldigi using flrig; QCX+ radio setting in flrig, /dev/ttyACM0, 38400 baud. PTT generic, PTT control on separate serial Port-setting. Port: QMX tranciever, with DTR: both and DTR +12v checked. Remember TX level attenuator (dB) in Fldigi must be 0 (lower right corner).

73
 

Sounds quite interesting! Could you put up your winlink/Vara settings here??
Thank you!
Peter HB9EBE
 

Reviving the thread, I was able to get the QDX to work with Vara and Winlink just yesterday. From Missouri, I hit KB2PCN-5 on 20M using Vara and sent/received messages.

QDX config, set the following parameters: - Rise Threshold: 65 - Fall Threshold: 45 - Minimum samples: 120

Winlink > VARA HF session > Settings > Radio Setup: - Radio Selection > Radio model: Flex Radios - select USB - check "Use internal soundcard" - Radio control port: - Serial port to use: COM port where the QDX lives - Baud: 9600 - Uncheck Enable RTS/DTR - PTT port > Serial port to use: Flex

Vara HF > Settings > Soundcard - Input: Digital Audio Interface (QDX Transceiver) - Output: Digital Audio Interface (QDX Transceiver) - Drive Level: 0 dB

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