I also use 192KHZ and 2048 buffer size. There are a couple of interesting relationships that I have observed.
1. If I use less than 192KHZ sampling rate, I get sharper filters; but, experience latency with using my keyer. The rig appears to key correctly; but, there is a delay between using the paddle and hearing the side tone. To my ears, this drives me crazy and makes the rig tough to use for CW. 2. If I use 192KHZ, my filters are not as sharp and I experience no latency with the keying. It's a real pleasure to use. Even though the filters are "not as sharp" they are still sharper than my old IC756 PRO III. Thus, I use 192KHZ and 2048 buffer. George, K2CM Apalachin, NY -----Original Message----- From: NZ8J [mailto:n...@woh.rr.com] Sent: Tuesday, May 12, 2009 6:42 AM To: flexradio@flex-radio.biz Subject: [Flexradio] Sampling rate and buffers for CW operators? I'm trying to get a feel for what other primarily CW operators are using for sampling rate and buffers taking the computer limitations out of the equation. Assuming the computer is robust enough to handle it, what setting do you find the best overall balance between latency and filter sharpness? I'm using a Intel quad core with 4 GB ram and I have the firewire driver and primary audio set at 192Khz sampling rate and buffer size of 2048. (Firewire at "normal" operation) The DSP buffers are set at RX=4096 and TX=2048. There appears to be little difference between the 100hz and 25 hz filters at these settings. The CPU usage is normally less than 20% running PowerSDR 1.18.0 and Logic 8 under these settings I am just learning how to operate this radio and would like to see what other cw operators are using. I am amazed by how quiet the radio is and how much easier it is to copy weak cw signals down in the noise. Thanks Tim NZ8J _______________________________________________ FlexRadio Systems Mailing List FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archives: http://www.mail-archive.com/flexradio%40flex-radio.biz/ Knowledge Base: http://kc.flex-radio.com/ Homepage: http://www.flex-radio.com/
