I run quisk under Linux (Ubuntu 10.04) successfully in RX & TX mode and like it very much. My hf hardware is a Funkamateur transceiver (kit) that covers 1.6 to 30 MHz but otherwise has the same functionality as a Softrock 6.3_rxtx with an USB controlled SI570 LO.
I tried to run quisk under XP professional with success as receiver. However when transmitting the sound output becomes garbled (periodically interrupted), the PTT button does not become red and the CPU load drops drastically to only 2 %.
The garbled sound on transmit is a known problem. Windows is not as fast delivering sound as Linux, and I have not had time to fix this. Maybe soon. Meanwhile you could try adjusting the sound timing parameters in your config file.
The PTT button will not function unless there is a method OnButtonPTT in your hardware file that controls whatever the hardware uses. See the hiqsdr hardware file for an example.
The drop in CPU usage on transmit is due to lack of screen updates and lack of filtering and demodulation of received sound. Try switching to the config screen while receiving to see the drop due to screen update. Try the FDX (full duplex) button to continue the audio.
I had another go with the windows version of quisk and realized that contrary to my previous statement the PTT button did work and the CPU activity did not drop. Fiddeling with the sound parameters (latency_millisecs ? and data_poll_usec ?)
did not help with the problem. The FDX option did not help either.
I am happy with the Linux version of quisk. It even works on my Lenovo S12 with an atom 270 cpu. A fixed windows version would be handy to operate some of the faster USB sound cards (emu and others)
There are two major users of CPU time in Quisk, the waterfall display and the digital filters. The difference between Linux and Windows may be a result of different display drivers. To check, watch the CPU time while switching between the waterfall screen and the config screen. The config screen uses little resources.
The difference between SSB and CW is the filter length. CW uses more taps to get narrower filters, and so should use more CPU time.
If you want to compare CPU times, be sure to stay on the same display screen, mode and filter bandwidth.
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