The stock 32S-3 uses the USB crystal for CW and will not "Transceive" with a 75S receiver. A wire lead 455kc. crystal must be added to the Function switch and the I.F. circuit modified for complete cut-off in receive or the oscillator will "bleed through". It is a nice MOD and will prevent you from calling a CW station with the 32S 50kc. away from his frequency!!! Jim