Quantumtangles !!
what on earth are you talking about ??
Did you not read atha post before yours ? he gave the model #
what's this comparator you keep referring to ?? the unit is a CB radio transceiver
what the ... ??? thats a VERY common way of having plug in crystals so that the channel freq's can be changed at leisure. They are JUST crystals, the rest of the oscillator is on the circuit board. one set of crystals for receive, the other set for transmit
Dave
I did not spot the model reference in the earlier post so tried to track it down. This was due to carelessness on my part unless the post was amended ex post facto my response.
The comparator = the closest board I could find made by the same manufacturer in the same period.
The difference between the two circuit boards seemed mainly to be in the layout of the crystals...in a line on the board in question but all over the place on the similar board I found online. I was inviting attention to the fact that the boards were not identical. Apologies for any confusion. It is my fate to be inarticulate, to misunderstand or to be misunderstood. Not sure which.
The missing component is essentially an adjustable inductor (in fact, two tiny inductors in a little metal box). Turning the screw adjusts the inductors and changes the frequency that can be picked up by the receiver.
Inductors are simply wire coils. Accordingly, to fix your transceiver, you should be able to attach a coiled piece of thin wire to the terminals where the missing component once sat. If you do this, and everything else is working properly, the transceiver should work. Play around with different lengths of wire and numbers of coils. You could also wrap, for example, about 15 coils of really thin copper wire around a ferrite (not iron) core as this will increase the inductance considerably when compared to a wire coil without a ferrite core. An iron core will probably cause too much interference.
As these devices come in pairs, have a look around for the counterpart transceiver as well