tlange

Just purchased an Airtronics MX3-S. Is it possible to use the transmitter with the crystal receivers that I have left over. If the transmitter is set to the same frequency of the crystall in the receiver, will this work.

Rodney

NO NO NO Transmitter crystal and receiver crystal are different animals. Both are usually overtone crystals but the reciever crystal , after being brought up to operating frequency, is 455 KHZ off the transmitted frequency if single conversion, 11.7 MHZ if dual conversion.

Antique

My Feedback: (4)

I think the question is "will my new tx work with my old recievers if I set the new tx to the same freq. as the old recievers"

tlange

Thanks Antique for the clarification. If the frequency of the crystal in the receiver can be set in the transmitter, will both be able to communicate with each other? I have several mini receivers for 1/18ths that I would like to use. Thanks for your help.

hilleyja

My Feedback: (3)

Yes, as long as your talking about the same modulation method and the same shift direction. FM (PPM) modulation is compatible across all TX brands. PCM (Pulse Code Modulation) is not -- each brand has their own proprietary modulation coding. JR and Airtronics use positive shift signals. Hitec and Futaba use negative shift signals. Some of the TXs have the ability of shifting the signal with programming and some RXs have the ability to shift receive signaling (usually with a jumper).

Rodney

Quote [Thanks Antique for the clarification. If the frequency of the crystal in the receiver can be set in the transmitter, will both be able to communicate with each other? I have several mini receivers for 1/18ths that I would like to use. Thanks for your help.]
If you mean "If the frequency of the transmitter can be set to match the frequency of the receiver (No way can the receiver frequency be set in the transmitter)" then, yes you can as long as the shift is correct and both transmitter and receiver are of the same type modulation, i.e. both FM or both AM.

Skinny Bob

My Feedback: (12)

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JohnBuckner

My Feedback: (1)

Nice unit tlange. This Tx comes with a synth module on either 27 or the 75 mhz bands. This enables you to easily, legally and rapidly change the Tx frequency to match your existing Rx'sfrequency. Modulation shift and transmitting frequency are two different issues. This Tx does not however have modulation shift select which means that it will only function with Rx's that use positive shift or are selectable for positve shift.

That means it will function with all JR and Airtronnics Rx's But many other aftermarket suppliers such as Hitec and Novak will provide Rx's on either shift to match your Tx. Also some provide selectable Rx's the can be changed to match. I beleve Novak has one that automatically selects the shift your Tx is using. but not sure of that fact.

So the answer to your original question must be 'that Tx may or may not function with your old Rx's which would depend on their shift.

What model and brand are your old Rxs?

John