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HPSDR PureSignal and ANAN-100 Set-up and Demonstration (Pre-distortion)

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Published on Mar 9, 2014

Video demonstrating the setting-up and operation of OpenHPSDR's latest feature (Q1 2014) - PureSignal. This is a pre-distortion algorithm to actively reduce the transmitter IMD in real-time. It works very well!

IMD occurs when you mix two or more signals together - think two tone test - and of course the human voice has dozens of peaks, harmonics etc. and these added together in the audio chain of your radio result in dozens or more IMD spikes. PureSignal effectively reduces these on the fly by such an amount that the result is an IMD performance hitherto never seen before in amateur radio transceivers and makes this aspect of the transmitter the very top of the IMD tree!

One of the long term aims of amateur radio transceiver manufacturers is the implementation of predistortion to improve transmitter IMD performance which, since the introduction of solid state radios and 12v PAs, has not fared well. Apart from the Swiss ADAT SDR, currently this is the only amateur radio implementation of predistortion and results in superb IMD figures when correctly set up.

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