[cathoderay57]

Hi Lawrence, OK I set my signal generator to 6MHz and tuned in the Marconi 855 to the tone modulated signal. I turned off the sig genny and switched on my Panasonic DR49 (which has a digital freq read-out) and tuned around for the heterodyne whistle from the other radio. Picked it up at 6.465MHz which means the Marconi 855 osc is running 465kHz above sig freq. I think that's correct. Cheers, Jerry