Radio Shack BTX-121 &123
I've had these laying around here for a few years and thought I would take a peek inside. These are old crystal controlled business radios. I see a spot at the bottom of the radio for the second set of crystals. What do you have to do to set a second channel in these old radios ? There is a spot for tx and one for rx . What is the pairing for crystals ? The factory setting is 154.600 for one channel. Would I be correct in thinking that I need 4 total crystals for both radios ,all the same for another freq or two sets of two paired up for tx and rx? Thanks and please excuse my ignorance on these.
REALISTIC PRO-53 , BEARCAT 145XL , BEARCAT 147XLT , PRO-46 , PRO-74 , PRO-2042 , PRO-2050 , PRO-2018 , PRO-89 , PRO-96(X2)