SPCM or PPM
#1
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SPCM or PPM
I just got my Jr 9303. I have been going though the programing for my planes and it gives me a choice to use SPCM or PPM. I have slimline JR700 RX in all my planes. What is the difference in SPCM and PPM.
Thanks.
Thanks.
#2
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RE: SPCM or PPM
I believe "S" is newer technology than "Z" but don't quote me on it. I know that I have to match the TX (SPCM or ZPCM) to whatever type of modulation the RX will accept. As for the differences between S and Z, I don't really know. I'll keep an eye on this thread hopefully to find out.
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RE: SPCM or PPM
Sorry, I misread your subject line and thought you were asking about the differences between SPCM and PCM rather than PPM.
The modulation required is always defined by the RX (other than the synthisizing systems).
The modulation required is always defined by the RX (other than the synthisizing systems).
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RE: SPCM or PPM
PPM is an FM transmission and SPCM is a PCM transmission. which one you use depend on the receiver. The receiver it came with is more than likely a SPCM receiver. but don't rely on that, a 700 is a ppm reciever
kinda easy to tell.
IF your receiver is PCM and it set to PPM it won't work.
If your reciever is FM/PPM and your Tx is set to PCM then then the servo will jitter and shake and have little to no control over them
kinda easy to tell.
IF your receiver is PCM and it set to PPM it won't work.
If your reciever is FM/PPM and your Tx is set to PCM then then the servo will jitter and shake and have little to no control over them
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RE: SPCM or PPM
As for the diff, I believe the ZPCM can resolve 512 step and the SPCM can resolve 1024 steps, but then again I fly Futaba, so I'm not 100% certain on that one.
#11
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RE: SPCM or PPM
Sorry to burst someone's bubble, RedFox, but here's how it works:
PCM, XPCM, ZPCM, PPM, they're all transmitted using Frequency Modulation, FM.
It just depends on the method in which the information is used to modulate the frequency.
PPM, Pulse Positiion Modulation, is plain old FM as we all like to call it. The data is used to shift the frequency of the RF signal coming from the transmitter.
PCM, ZPCM, XPCM, are all Pulse Code Modulation techniques, different from one another, but still just digital information being used to modulate the RF from the transmitter.
PCM, XPCM, ZPCM, PPM, they're all transmitted using Frequency Modulation, FM.
It just depends on the method in which the information is used to modulate the frequency.
PPM, Pulse Positiion Modulation, is plain old FM as we all like to call it. The data is used to shift the frequency of the RF signal coming from the transmitter.
PCM, ZPCM, XPCM, are all Pulse Code Modulation techniques, different from one another, but still just digital information being used to modulate the RF from the transmitter.
#12
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RE: SPCM or PPM
I also have a 9303. For the 700 receiver, and I have one, you need to set PPM. For the 770 receiver, set SPCM. They are both nice little receivers.
As was mentioned earlier, ZPCM is the older 512 step receivers and SPCM is the newer 1024. I don't think JR sells any of the ZPCM receivers any more.
As was mentioned earlier, ZPCM is the older 512 step receivers and SPCM is the newer 1024. I don't think JR sells any of the ZPCM receivers any more.