[hpsdr] CW Operation

[Luke Steele]

John,
I have the paddle connected directly to the DB-9 connector on Magister, and
use the PSDR keyer.
The latency issue I have been experiencing is with the CW sidetone in the
headphones, connected directly to the headphone jack on Mercury.
What are your settings in the Audio tab for buffer size and sample rate,
and in the DSP tab for the CW RX and TX buffer size?
I may have solved my problem by reducing the audio buffer size.
Previously I had an older PC and I was running the larger buffer to reduce
CPU loading. Now I have a fast machine, and that should no longer be an
issue. The CPU loading meter indicated up to around 15% in tests last night.
I will give it a run tonight to see how it goes. I seem to get a pileup
nearly each time I touch the paddles on 15 and 20m lately!
73,
Luke VK3HJ

At 08:28 PM 7/01/2011 -0800, John Petrich wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>Luke,
>
>My HPSDR system has been on the air for almost exactly 12 months now.  Made 
>a thousand or more CW QSO's and am not bothered by any latency what so ever. 
>I'm not making light of your complaint, but am wondering why you are 
>experiencing something that I am not experiencing.
>
>The "latency" between actuating the paddle / key and the actual CW output as 
>detected by a remote receiver is confirmed by my observations. As a 
>practical matter, my HPSDR system uses the native Power SDR keyer to key the 
>transmitter and uses the native Power SDR monitor system to monitor the 
>output.  In that configuration,  there is no apparent latency and the keying 
>sounds to me, and to the people whom I QSO, remarkably clean and pleasing to 
>listen to.  The undeniable latency in the system is all relative and not 
>detectable by me using this setup.
>
>Could your "latency" be linked to your possibly using an external keyer and 
>your trying to monitor using the native Power SDR monitor system?  I just 
>don't know.
>
>Regards,
>John Petrich, W7FU 

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