Eric, this is old news when running the Firebox :-) Actually 0-latency operation is not dependent on running at 96 khz. I am running my system at 48 khz sampling using the stock Firebox firmware and new keyer code (external keyer not required). With the PreSonus set to 512 buffers and *2.5ms* latency there is absolutely *NO* delay! I can go as low as 2.0 ms latency while running the same buffer settings on this system without incurring ANY receive artifacts (3.2 Ghz P4-HT). The radio sidetone/monitor is perfectly in sync with the keyer sidetone and paddle actuation. Saying that however, there are advantages to using an ext keyer to more precisely control the break-in action of the radio (for fast break-in operation), and first character attack and delay through the use of the PTT line.
Kirb - VE6IV --- Eric Wachsmann wrote: > ------------------------------------------------------------------------ > Let me give you the skinny right from the horses mouth. Here's what I did: I was using a laptop (P4 ~2GHz) with a >FireBox. I set the FireBox to 6ms on the FireBox control panel. This could probably go lower on a more powerful >machine. I then set the PowerSDR buffers to 512 for the Audio and DSP. I set the FireBox and PowerSDR to use >96kHz sampling rate. At this speed, our prospective customer was able to send 50WPM using the soundcard >monitor (not an external keyer). This is the first time that we have tried this experiment at high speed since we >added 96kHz support. Previous attempts at this speed all led to us directing our customers to use external keyers >for high speed CW. The long and short of this is that with the right setup (small buffers, low latency, fast PC, etc), >high speed semi-break in CW is possible with the SDR-1000 TODAY! > > >Eric Wachsmann FlexRadio Systems -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachments/20060522/a3b0e02c/attachment.html _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
