[hpsdr] Thetis, CW and sidetone

[Oleg Skydan]

Dear Scott,

Thank you for the detailed answer. It looks like I will have to add CODEC to my board.

BTW, I have packed 4 receivers and one transmitter into EP4CE22E22. Still have approx. 10% of the FPGA unused, it should be enough to add CODEC support and some other features.

Best!
Oleg
73 de UR3IQO


From: Scott Traurig 
Sent: Sunday, April 21, 2019 2:57 PM
To: Oleg Skydan 
Cc: hpsdr 
Subject: Re: [hpsdr] Thetis, CW and sidetone


Short answer: no.


Longer answer: fully virtualized CW is possible. You can attach a key or paddle to a PC serial port and Thetis (and PowerSDR) will use it. And you obviously can receive CW signals using speakers plugged into the PC instead of the radio hardware. But the dev's never tackled the problem of locally generated (Thetis or PoweSDR) sidetone. Initial efforts had far too much latency from key to speakers and they abandoned it.


Now that we are much smarter about latency in the radio, audio and otherwise, local sidetone should be possible, but it is not on the dev's priority list.


Two possible solutions (neither of which I've tried, I'm not a CW operator):


1. Use the new QSK mode. Your sidetone is essentially your own signal from off-the-air. Make sure to be using the Low Latency filters in Setup > DSP > Options.
2. Go old school and attach a sidetone generator across your key or paddle, or use a desktop keyer with built-in sidetone.


73,


Scott/w-u-2-o


On Sun, Apr 21, 2019 at 1:21 AM Oleg Skydan <olegskydan at gmail.com> wrote:


  Hi, List!

  Can Thetis generate CW sidetone locally on the computer (and send it to the 
  computer speakers via VAC)?

  Thanks!
  Oleg
  73 de UR3IQO 

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