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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Transmitter and receiver problems
07-19-2006 01:34 AM  14 years ago
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Taddy

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Victoria, Canada

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Transmitter and receiver problems
I was using my old FM Futaba transmitter with a GWS FM receiver,everything was fine. My transmitter broke so I purchased a JR XP662 transmitter. I placed my old crystal into the XP662 and they wont talk to each other. Am i to believe I now need a PPM compatible receiver???
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07-19-2006 01:45 AM  14 years ago
dkshema

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Cedar Rapids, IA

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If your GWS receiver worked with the Futaba TX, then it won't work with a JR transmitter. Your receiver was Futaba shift compatible, not JR.

Futaba compatible receivers are "negative shift", while JR compatible receivers are "positive shift". The two are not compatible.

You should have replaced your Futaba transmitter with another Futaba transmitter.

And to make matters worse, a crystal from your Futaba transmitter most likely won't work properly in a JR transmitter.

Dave
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07-19-2006 01:35 PM  14 years ago
Yugdab

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Bedfordshire, England

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When I smell BS, I just have to chime in!!!

Just go and get yourself a JR crystal for your JR transmitter (of the correct type and frequency, obviously).

What I think dkshema is referring to is the servos. If you replace a JR servo with a futaba servo you have to reverse the output in the tx for the reason he gave.
If things don't change... they'll stay as they are!
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07-19-2006 01:37 PM  14 years ago
Nightstalker

rrElite Veteran

UK (BEDFORDSHIRE)

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Hey i live in the same town and i can smell it as well
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07-19-2006 01:54 PM  14 years ago
fritzthecat

rrKey Veteran

Virginia Beach, VA

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Taddy is in Canada. That means he is using 72Mhz. On the 72Mhz band, JR and Futaba Tx/Rx gear is NOT compatible. See the aforementioned Neg/Pos shift writeup.
So Taddy either needs a JR receiver or a Futaba Tx. The TX must have a crystal from the same manufacturer in it or it will not work at all.

Fritz

'Send Money, Women and Guns!'
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07-19-2006 01:57 PM  14 years ago
SteveH

rrProfessor

Texas

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Yep, Dave and Fritz are right...the JR TX won't work with the Futaba shift RX, and the Futaba crystal won't work in the JR TX.The government cannot give you anything without first taking it from someone else.
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07-19-2006 02:05 PM  14 years ago
Yugdab

rrApprentice

Bedfordshire, England

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Well, I stood corrected on that one then. Sorry for any offense caused.If things don't change... they'll stay as they are!
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07-19-2006 03:38 PM  14 years ago
Pistol Pete

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Seffner, FL

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a little research usually takes care of such things.~~Enjoying the hobby one flight at a time~~
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07-19-2006 03:38 PM  14 years ago
AirWolfRC

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42½ N, 83½ W

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Yep, what SteveH said.
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07-20-2006 01:35 AM  14 years ago
dkshema

rrMaster

Cedar Rapids, IA

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Positive and Negative shift have nothing to do with the servos.

It's a transmitter thing for FM systems.

Dave
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