Hello Guys,

I've read this whole part, before posting anything.
Let me tell this : PCM NO THANKS !!!!

PCM is actually the same signal, but with a digital code put on. If the RX 'sees' a bit wrong, it knows it did a bad reception.

At my club, everyone fly's PCM, except me.
Now, at a certain place, there is a small forest, and all the pcm guys seem to loose control if they accidently forget it, but it doesn't always happen.
I passed the same place, right after one crash happened there, nothing happened. Airplane ? Curare .40 with an 25 year old Sanwa, 40Mhz at AM.
Now, what do I notice ? If I do a groundcheck I get at least 2.5 the range of the so high priced Futaba's.
Now, I still use my OLD Multiplex receivers that are ppm single conversion ? What do I notice ? totally no problems, and way bigger range that the PCM guys. With groundcheck and in the air.
I can easily park my plane in the clouds, and go wide away.

Now, what happens usually with PCM ? It 'cleans' the signal, thus working away any distorsion, where you could notice a slighty later response. If this happens if you are flying away, you won't notice going out of reach, while with PPM, you will be noticing this with your airplane doing odd things, while still having the chance to turn it back towards you.

PCM so safe ? This summer in Chechia two people died after an airplane in F3A crashed in the public. The rx was programmed as it should be, yet, it quiet didn't do what it should do. The airplane was getting out of a hoover, while it leveled, and just flew away, right into the public, that was more then 200 meter away.
The pilot, yet a very experienced flyer was arrested, while he previously flew, and nothing happened.
Now, what did happen ? right at his freq. a very powerfull Tx started to send signals ( some radio ). Clearly, the PCM 'recognised' it, putting everything level, and there it went..........

Ofcourse, he got cleared from any blame !


Back to Belgium : You have to know it's really a small country, full with TX's, cellphones, radios that bring quiet a disturbance in the air. Now even the market opened to 35Mhz toys.
Still my PPM's function greatly, being single conversion.

What's happening more ? well, ACT braught out a dual frequency system, bringing the range up to 5 km, this setup and range was tested by TUV, and showed in a big 4 or 6 turbines model airliner.
They even have DSP on ppm, and their receivers are great. But I think I have to say they only have products in 35 and 40Mhz
Check www.acteurope.de . With ACT, you can litterally check how much distorsion and failure your TX saw. Really nice stuff. I just baught my first ACT DSP ( dual conversion ) With some of the models, you even buy a RX that is able to distribute 15A , and some models can directly work on 2C lipo, they stock servo's for these as well, capable of 39Kg/cm Patternflyers this is for you guys !

I hear Berg is going that way too. And towards my feelings, never buy PCM

For what it's worth the Multiplex IPD's are [sm=thumbs_up.gif]
As I recollect well, you can LOCK them at one frequency, thus getting rid from the probs of switching over to the frequency of your neigbour.
The IPD does bring DSP on PPM as well.
Same goes for the module for your transceiver. You dial in the frequency you want them to be on.