VHF Transceiver Crystals

Probably the local oscillator, for the receiver. If it is double conversion and most are there will be two. One may have 10.7 Mhz a common Hi IF frequency the other may have 10.245 to give a common Lo If of 455 KHz

Thankyou for your reply. One has 169.4875 and other 169.4750 printed on it.Is that consistent with there being local oscillator xtals?

Where did you find that beast? Those two frequencies are a transmit/receive pair for what is listed as "Social Radios", apparently meant for communication between elderly patients and their monitoring service, or as "Aids for the hearing impaired", so that radio is probably from Europe. In the US they're in the commercial VHF band. I hope you have a license for it.

I bet that if you remove the socketed crystals the transceiver will revert to the soldered in frequencies. Amazing how all that circuitry now resides on a single chip SDR (Software Defined Radio).

I know this is an old thread but I thought I would clear this matter up just in case it helps someone out there.

This transceiver has been modified. Originally it was single channel using the crystals with the dark markings. Subsequently it's operating frequency was changed and new crystals added. Whoever did this couldn't be bothered to remove the original crystals, so they just disconnected them from the channel switch. Normally this transceiver has six channels and the channel switch connects to all twelve crystal positions.

Incidentally, the receiver 2nd oscillator crystal is the one above the metal screen to the left of the picture .