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HelicopterMain Discussion › PCM Receiver
04-26-2004 07:29 PM  13 years agoPost 1
flysacessna

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Florida

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Hi All, I acquired a old but new Futaba PCM 1024 9 chanel receiver. It's 72 mhz and I want to use it; however I don't have a PCM futaba transmitter. Will my standard conquest work with this receiver or do I need something better?

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04-26-2004 07:40 PM  13 years agoPost 2
reddragon

rrElite Veteran

Brooklyn, N.Y.

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I am sorry Man. You will have to get a PCM transmitter.

Wayne - Fly it like you stole it! You're in good hands with Runryder!

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04-26-2004 08:27 PM  13 years agoPost 3
armageddon

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N. Y.

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no..

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04-26-2004 10:04 PM  13 years agoPost 4
comet

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Neuilly sur Seine, Fr

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If your transmitter is also in 72 Mhz, and if you get a PPM cristal matching the transmitter's frequency for that receiver (check also if this receiver is single or dual conversion, crystal will vary)

you may want to make sure there is nothing to do about it.

you couldn't set a pcm cristal on a ppm receiver though

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04-26-2004 10:55 PM  13 years agoPost 5
Hughes500Pilot

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Anaheim, CA

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Be careful of the advice you receive... I'm sure comet has good intentions, but his info is wrong...
get a PPM cristal matching the transmitter's frequency for that receiver
It sounds like he is telling you to buy a PPM (FM) cyrstal and put it in your PCM reciever to solve your problems... However, the crystal has nothing to do with it. A PCM receiver uses an FM (PPM) signal, but it sends it out in a code. That is how they get the name Pulse Code Modulation.

Of course you will need a proper crystal (dual conversion, on your specific frequency). But, that has nothing to do with FM vs PCM. Because a dual conversion FM receiver and a PCM receiver use the same crystal...

The good news is that most of todays computer transmitters are both FM and PCM capable. You can hit couple of buttons and in a matter of seconds change from FM to PCM. This will allow you to use your new PCM receiver along with all you "older" FM receivers as well...

-Steve

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04-27-2004 05:51 AM  13 years agoPost 6
Fullagas

rrKey Veteran

Michigan

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.
The consensus is right, PCM receiver needs PCM TX to work. It will ignore a PPM signal, that's its job.

Good upgrade opportunity, if ever there was one!


.

Flying helis since gyros had springs.

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04-27-2004 05:59 AM  13 years agoPost 7
tailrotordave

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Burbank, Ca

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"It will ignore a PPM signal, that's its job."
Is that true? If you're on , let's say, channel 50 with a PCM radio and a guy at the other end of the flight line turns on his FM (PPM) radio on channel 50 then nothing will happen? I thought it would still lockout. If that were the case then 2 guys could fly on each channel as long as one was PCM and the other wasn't......

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04-27-2004 06:23 AM  13 years agoPost 8
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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YES !

They WILL cause radio interferrence. The difference is HOW the signal is decoded and acted on. RF on FM, regardless of modulation, will put them in the dirt.

You must send a PCM encoded signal to the PCM RX to get it to respond to commands. Hence, FM modulation will not suffice.

James

(Ham license KD5ZLT)

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04-27-2004 06:38 AM  13 years agoPost 9
Fullagas

rrKey Veteran

Michigan

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.
TRDave,

Sorry, I was being simplistic in my answer. If an FM PPM Tx fired up while I was flying my Futaba PCM Rx on the same channel, my radio would either: 1. Go into failsafe (if programmed), or 2. would 'lock out' during the interference, during which I would have intermittent control at best. This is what I refer to as 'ignore' mode. I didn't mean to infer the 2 radios could fly at the same time. Hope that's a little clearer.



.

Flying helis since gyros had springs.

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04-27-2004 09:07 AM  13 years agoPost 10
comet

rrVeteran

Neuilly sur Seine, Fr

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you may want to make sure there is nothing to do about it.
so I was apparently mistaking
sorry for that.

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HelicopterMain Discussion › PCM Receiver
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