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Futaba 3PKS w/JR Receiver?

Futaba 3PKS w/JR Receiver?

Old 11-15-2007, 05:33 PM
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Default Futaba 3PKS w/JR Receiver?

I just got a Futaba 3PKS with 75mhz module. I didn't get it with the receiver because I assumed that my other 3 JR Receivers I had before would work. I just got my 3PKS semi setup and I set the channels on both the car and radio and turn them on and nothing.

Can I use JR 75 synthesized receivers with my 3PKS with 75 synthesized module?
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Old 11-15-2007, 07:00 PM
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Unless your JR recievers are shift selectable then no. Futaba transmitters are negative-shift, JR recievers are positive-shift; they are not compatible.

-Frank
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Old 11-15-2007, 08:06 PM
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Thanks for the reply.

What do you mean by "shift" though?
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Old 11-15-2007, 11:34 PM
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It refers to the way the information is coded and sent from the transmitter to the reciever. I've never gotten a complete and strait answer myself. However, the rule is: Positive shift radio gear (Airtronics and JR) will not work with negative shift radio gear (Futaba and Hitec). Some radios allow you to choose what shift you're trasmitting on and some companies make recievers for both shifts. But your JR recievers won't work with your new 3PKS.

I went Spektrum a couple years ago and haven't looked back since

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Old 11-16-2007, 12:07 AM
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wow, i dont know about this "shift" thing.
But nice info there Frank
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Old 11-16-2007, 12:29 AM
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You sure can use Jr synthesized rx's with futaba 3pk synthesized. I did that with my 27mhz 3pk synthesized i went out and bought 2 Jr synthesized rx's and they worked. All you need to do is change it from HRS mode to either PPC or PCM.

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Old 11-16-2007, 09:54 PM
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I did this.

They will NOT work. You are on the same channel, but its transmitted a different way so it doesn't receive it. My friend gave me his Futaba synthesized rx and it worked perfectly.
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Old 11-16-2007, 11:27 PM
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I thought all 27MHz radios/receivers were compatible? 75MHz is different though.
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Old 11-16-2007, 11:43 PM
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Originally Posted by ittjv
I thought all 27MHz radios/receivers were compatible? 75MHz is different though.
No. I think you're thinking of FM (PPM) vs. AM. In AM Futaba and JR are compatible. The 3PKS comes standard as FM or PCM, and in that case Futaba and JR are not compatible. You can, however, purchase an AM module for the 3PKS.

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