Philips FM92E Manual page 51

Above is a spectrum analysis of the signal from the FM92E Synthesiser VCO Buffer Output [pin 18] to the
transmitter board input via coax with the Transmitter OFF and the Receiver on. The IF in this case is 10.5 MHz.
The approximately 65Mhz is the injection frequency which goes to the receiver mixer.
Above is a spectrum analysis of the signal from the FM92E Synthesiser VCO Buffer Output [pin 18] to the
transmitter board input via coax, with the Press To Talk key ON, ie the transmitter was keyed. Note the
harmonics of the originating approximately 52Mhz frequency.
Philips FM92E Conversion to 6 Meters: Version 3.9 Page 51