QUISK is a Python module that controls a receiver and transmitter. QUISK rhymes with "brisk", and is QSK plus a few letters to make it easier to pronounce. QSK is a Q signal meaning full breakin CW, and QUISK has been designed for low latency CW operation. It works fine for SSB and AM too. QUISK is written in Python and C, and all source is included so you can change it yourself.
It currently runs only under Linux using ALSA sound drivers and offers these capabilities:
* As a receiver it can use the SDR-IQ by RfSpace as a sample source. There are several decimation rates available. The screen shots below were taken using the SDR-IQ. The QUISK receiver will read the sample data, tune it, filter it, demodulate it, and send the audio to the sound card for output to external headphones or speakers.
* As a receiver it can use your soundcard as a sample source. You supply a complex (I/Q) mixer to convert radio spectrum to a low IF, and send that IF to the left and right inputs of the sound card in your computer. The demodulated audio goes to the same soundcard for output.
* As a transmitter it can control my SSB/CW exciter using Ethernet. For CW, QUISK can mute the audio and substitute a side tone.
* As a transmitter it can accept microphone input and send that to your transmitter for SSB operation. If you are not using my hardware and not using Ethernet, then you will have to modify the C code in microphone.c to connect to your hardware.
If you have the SDR-IQ or the Softrock-40 hardware, then QUISK is ready for you to use as a receiver. If you have other receive hardware, then you will need to change the file quisk_hardware.py to connect your receiver to QUISK. For example, if you change your VFO frequency with a serial port, then you need to change quisk_hardware.py to send characters to the serial port. The file quisk_hardware.py is written in the Python programming language, a very easy language to learn and use.
I have tried to make QUISK easy to modify so it can be used for hardware other than my own.