ORIGINAL: NightLife
ok ok lets try one more time....lol
oh and for anyone who says this stuff isn't confusing... is a liar
(at least for a beg.)
now no matter if i buy an FM (PPM) or PCM tx it will use a normal cystal reciever unless i buy a synthesized module?
so that means i can go ahead and buy the PPM 9C w/ 4 servos and latter i an buy the synthesized recivever so i dont have to deal w/ crystals in case i need to change frequencies?...PLEASE say this is right....
Thanks
Chad
Like you said, let's try this one more time...
1) PPM and PCM are two different modes of FM transmission. The 9C can transmit in both modes.
2) If a TX or RX is "synthesized", this means it does not rely on a crystal to determine the channel it is tuned to, and it can
electronically tune any channel within the band.
3) If a TX or RX uses a crystal (or a module with a crystal), this means it relies on that crystal to determine it's channel, and you cannot change the channel without changing that crystal (or the module with the crystal).
So PPM and PCM are two different types of FM transmission, and synthesis and crystals are two different ways to select a particular radio channel. The mode (PCM or PPM) of the RX and TX
must match up for them to work together. The way the RX and TX tune their channel (synth or xtal)
does not have to match up, they just must be tuned to the
same channel.
To completely rid yourself of having to buy xtals, you need a synth TX and a synth RX.