[hpsdr] Tone in 20m/15m after switching to CWL/CWR

[Ramakrishnan Muthukrishnan]

Hello:

I have a good old Atlas based system with Penelope, Mercury and Ozy connected to the boards. At this point, I am just listening with Mercury as I do not yet have my pennylane setup and don't have alex boards. So, the antenna is connected to the RF in of mercury. I can listen to stations just fine (with PowerSDR mRX PS, latest available release from the Github) on SSB on every band.

Now, if I switch the band to 20m and push the CWL or CWR button, I get a constant tone - like a series of dits (as if I keep the dit paddle on). If I tune around the frequency, the tone follows there too. I do not have anything connected to the DB25 port of the Ozy. I see the LEDs on Penny (at least the leds 2, 3 and 4) dancing while this is happening, so it looks like it is transmitting when I just switched the receiver to 20m CW. Pushing CWL/CWR on 40m or 80m seem fine and I don't hear the tones.

Has anyone seen this? Or it is that I have setup my systems wrong? I am returning to HPSDR after a very long time, so I may have missed something.. I have latest firmware versions of Mercury and Penelope. I also have PTT explicitly disabled in the "Options" tab under the HPSDR setup. What are the other ways to disable Penny (other than physically pulling it out of the Atlas board)? I am somewhat puzzled why Penny is trying to transmit when I am not transmitting at all. (I don't have a dummy load connected to the output too, so I was a bit alarmed).

Would appreciate advice.

73
-- 
  Ramakrishnan VU3RDD