A single conversion crystal that is FM and on that channel will work just fine, Ken.
The only variable is the receiver and crystal as far as single or dual conversion goes. If the detector circuit of the receiver (the input, or 'front-end') is single or dual conversion, then you need a single or dual conversion crystal -- even though both types will state the specific frequency/channel (let's say, ch-77) on the crystal. The transmitter, as long as it's FM, does not give a whit how the receiver processes the signal, just as long as the intelligence sent from the transmitter (the pulse train, which is encoded as variations of frequency) matches the decoder logic of the receiver.
Dual conversion receiver must use a dual conversion crystal, single conversion receiver must use a single conversion crystal. Transmitter don't care!
One fly in the ointment -- the transmitter encoder logic must match that of the receiver decoder logic. Today it's either PCM or PPM. Make sure your receiver and transmitter share the same encryption type.
Snatch up a new receiver from Bob -- all he sells now are FM types, and they come with crystal installed. Tell him what channel your transmitters on, maybe he can find a receiver already on ch-77 for you.
If Bob can't get it to you right away I can rip a receiver out of an inactive boat and loan that to you. Finding one on ch-77 will be a problem though. Is your transmitter Futaba crystal compatible?
Hope I did not throw too much **** at you at once, Ken. Keep posting, pal. We'll work this out.
We'll get you back into the water. No excuses!
David
The only variable is the receiver and crystal as far as single or dual conversion goes. If the detector circuit of the receiver (the input, or 'front-end') is single or dual conversion, then you need a single or dual conversion crystal -- even though both types will state the specific frequency/channel (let's say, ch-77) on the crystal. The transmitter, as long as it's FM, does not give a whit how the receiver processes the signal, just as long as the intelligence sent from the transmitter (the pulse train, which is encoded as variations of frequency) matches the decoder logic of the receiver.
Dual conversion receiver must use a dual conversion crystal, single conversion receiver must use a single conversion crystal. Transmitter don't care!
One fly in the ointment -- the transmitter encoder logic must match that of the receiver decoder logic. Today it's either PCM or PPM. Make sure your receiver and transmitter share the same encryption type.
Snatch up a new receiver from Bob -- all he sells now are FM types, and they come with crystal installed. Tell him what channel your transmitters on, maybe he can find a receiver already on ch-77 for you.
If Bob can't get it to you right away I can rip a receiver out of an inactive boat and loan that to you. Finding one on ch-77 will be a problem though. Is your transmitter Futaba crystal compatible?
Hope I did not throw too much **** at you at once, Ken. Keep posting, pal. We'll work this out.
We'll get you back into the water. No excuses!
David
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