ORIGINAL: pirogue
can somone provide a link to load's of info about rx's, tx's and compatibility.
i plan on buying a sport arf and need rx and servos to go along with my jr quatro tx for the alpha 40 and i'm not looking to spend a bunch of money to upgrade tx.
what is your advice.
here are some of the info i'd like to know:
1, if i buy rx and servo's for a second plane to go along with the jr quattro for now, what componets will be compatible with an upgraded computer tx.
2, difference between fm and pcm, are they compatible?
3, can i run futuba rx with a jr tx?
4, digital servo's are they compatible with fm rx?
No links handy but can try to provide a few quick answers.
1. The JR Quatro is a FM transmitter so you need a RX that is compatible with their "positive shift" modulation system. These days virtually
ANY servo will work with
ANY RX. You MAY need to trim off a polarity key on the outside of the plug like on Futaba servos or you may need to change the wiring in the plug very slightly, easy to do. RCKen has a nice diagram of this I'm betting he will kick in here with soon.
2. Most PCM transmitters can be made to transmit FM also. PCM is actually a form of FM. Each mfg has their own PCM code and they are
NOT interchangeable. This does not effect the servos in any way. The TX
MUST be able to XMIT in the same modulation format as the RX.
3.
NO, unless JR has come up with a TX that can switch to "negative shift" transmissions. It would likely be in one of their expensive sets.
4. The servos don't care what they are plugged into as long as the wiring code matches. They work fine with AM, FM, PCM and Ouija boards
. Well, OK maybe not the last. Digital or analog, all work fine. Digital usually use more power depending on torque available.
Edited to correct shift types. oops.