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IMD and PSK31

Submitted by kd5ten on November 17, 2007 - 01:09

IMD stands for inter-modulation distortion and is a measurement of the first set of unwanted sidebands on a PSK31 transmission to the desired ones. It is then measured in decibels. Generally, a -30dB is considered a excellent IMD, while -20dB is a poor transmission.

Computer-less PSK31?

Submitted by kd5ten on October 17, 2007 - 01:08

Milt W8NUE and George N2APB have created a device that implements PSK31 communications without a PC. It is not available for order yet, but will allow true "portable" PSK.

Check their website for info and pictures: http://www.amqrp.org/kits/nue-psk31/index.html