- Apr 30, 2012Over the past few years I've built three or four Si-570-based SDRs. To accurately calibrate them I've used a GPS-stabilized 10mHz reference input to a counter and the Expert/Clock Offset input in PSDR-IQ to correct frequency errors. Up until now I've never had to input any correction greater than -3900. But today in setting up for a possible new radio using PSDR-IQ v18.104.22.168 it required an offset of -60,530 to calibrate!
I wonder if anybody else has seen this much required correction??
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