Getting good CW with cwdaemon on linux

[jmeloranta]

If one starts cwdaemon directly on Linux, it produces rather choppy and poor CW. So, I experimented a bit and it seems that the following will produce nice and consistent CW:

echo 1 > /sys/bus/usb-serial/devices/ttyUSB1/latency_timer
chrt -f 99 /usr/bin/cwdaemon -d /dev/ttyUSB1 -o key=DTR -o ptt=none -x n

This reduces the rs232 port latency (1st line; 1 ms latency), runs cwdaemon with real time priority (chrt command) and disables audio output on the computer (-x n). In my case above /dev/ttyUSB1 is the RS232 port for the radio, which uses DTR signal for keying.

Jussi (aa6kj)