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JR Dual Conversion question

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Old 01-31-2008, 01:38 PM
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MetallicaJunkie
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Default JR Dual Conversion question

My brother has a dual conversion receiver JR R945S, and i just purchased a Jr pcm 10x, are they compatible? i cant get them to communicate... should i just stick to a single conversion Rx ?
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Old 01-31-2008, 01:49 PM
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Crewcut
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Default RE: JR Dual Conversion question

Try switching 10x to transmitt on PPM
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Old 01-31-2008, 02:11 PM
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Default RE: JR Dual Conversion question


ORIGINAL: Crewcut

Try switching 10x to transmitt on PPM
The 945 is clearly a PCM receiver, so that won't work. Do you have the appropriate crystal for the 945, in the red plastic holder? If you just put the grey crystal from a single conversion rx into the 945, is will **NOT** work - the crystals are different. FWIW, I have a 945 on my 10X, and it was no issue at all - they work flawlessly.

- Tim
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Old 01-31-2008, 03:30 PM
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Default RE: JR Dual Conversion question


ORIGINAL: tadawson


ORIGINAL: Crewcut

Try switching 10x to transmitt on PPM
The 945 is clearly a PCM receiver, so that won't work. Do you have the appropriate crystal for the 945, in the red plastic holder? If you just put the grey crystal from a single conversion rx into the 945, is will **NOT** work - the crystals are different. FWIW, I have a 945 on my 10X, and it was no issue at all - they work flawlessly.

- Tim

thanks tim... my receiver has a red "28" in it and my tx module has a grey "28 crystal. so thats the problem?
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Old 01-31-2008, 03:33 PM
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Default RE: JR Dual Conversion question

JR TX crystals are black caps. If yours is a grey crystal, then you have a receiver crystal in your TX.

In the states, it's not legal to change TX crystals without having the tuning of the transmitter checked. Modules yes, crystals no.

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Old 01-31-2008, 05:36 PM
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Default RE: JR Dual Conversion question


ORIGINAL: tadawson


ORIGINAL: Crewcut

Try switching 10x to transmitt on PPM
The 945 is clearly a PCM receiver, so that won't work. Do you have the appropriate crystal for the 945, in the red plastic holder? If you just put the grey crystal from a single conversion rx into the 945, is will **NOT** work - the crystals are different. FWIW, I have a 945 on my 10X, and it was no issue at all - they work flawlessly.

- Tim

sorry if i confused anyone.... my tx module has a black cover, and the rx receiver crystal has the red cover, they are both on the same frequency but do not work...


would i need to buy a dual conversion tx module, so i could use the 945 receiver?
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Old 01-31-2008, 05:45 PM
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Default RE: JR Dual Conversion question

Dual conversion relates only to the Rx signal processing-----NOT the Tx.

If both Tx and Rx show to be on the same frequency and both are JR and they are not operating properly then you've got problems and probably need a trip to Horizon's service center-------save a lot of time and frustration, send it in.
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Old 01-31-2008, 05:54 PM
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Default RE: JR Dual Conversion question

ok thankx
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Old 01-31-2008, 07:58 PM
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Default RE: JR Dual Conversion question

The only other thing that comes to mind is that some of the older 10X radios would support PPM, ZPCM, and SPCM . . . if you have the choice, the one you need for a 945 is SPCM. If not, then never mind . . . if you are on SPCM, and nothing works, then as others have said, something is broken, and it needs a checkup . . .

- Tim
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Old 01-31-2008, 11:29 PM
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Default RE: JR Dual Conversion question

a checkup it is then ... thanks for all the help guys
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Old 02-13-2008, 08:00 PM
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Default RE: JR Dual Conversion question

hi i am new computer radios with that beeing said, i got a JR 8103, i fly only airplanes , and i have a 10ch s-class PCM rx R955S 72mhz. My transmitter has a modual with low band ch 31 72.410. the qustion is what type of crystal do i need to use for my receiver, same freq i know, what is the deff between dual conversion and singal band, what do use for PCM is it the same as use an fm crystal ?
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Old 02-13-2008, 10:46 PM
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Default RE: JR Dual Conversion question


ORIGINAL: edge540h

hi i am new computer radios with that being said, i got a JR 8103, i fly only airplanes , and i have a 10ch s-class PCM rx R955S 72mhz. My transmitter has a modual with low band ch 31 72.410. the qustion is what type of crystal do i need to use for my receiver, same freq i know, what is the deff between dual conversion and singal band, what do use for PCM is it the same as use an fm crystal ?
PCM crystal is the same as an FM/PPM crystal. A dual conversion radio MUST have a dual conversion crystal. That said JR doesn't "CALL" this either a sinmgle or dual conversion unit.
http://www.horizonhobby.com/Products...odID=JRPR955**
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Old 02-14-2008, 12:01 PM
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Default RE: JR Dual Conversion question

As it is a 955S and doesnt have the letter D, its a Single Conversion receiver, therefore a Grey capped crystal is needed.
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Old 02-14-2008, 01:15 PM
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edge540h
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Default RE: JR Dual Conversion question

THANKS GUYS ILL BE HEADING TO THE HOBBIE SHOP TODAY
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Old 02-14-2008, 03:09 PM
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Default RE: JR Dual Conversion question

And there is no low band or high band designation where JR is concerned, thats only Futaba and only Futaba recievers marked as such.
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