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Hi Pierre. Since you indicated a reference frequency of 25 MHz, Bruce correctly assumes you have the TCXO option installed in which case you shouldn’t need to worry about calibration. If you don’t have the TCXO installed then the reference frequency is 27 MHz and your procedure should work ok to get close however getting exact zero beat may be difficult since the audio rolls off at the low end.?

Good luck ….73 …. Ron