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West Australia Radio Soarers • View topic - PPM out of a Rx

PPM out of a Rx

First Pilot View

PPM out of a Rx

Postby cholme » Fri Mar 22, 2013 7:16 am

Hi all
I have been asked about extracting PPM from a receiver in order to reroute it through a long range transmitter. The idea is to be able to walk around without carrying a huge FPV tX with you. so we carry the tx which transmits to a normal rx which in turn is attached to the FPV Tx. To operate the FPV Tx in question we need to extract the combined PPM signal from somewhere inside the RX or recombine them from the servo outputs on the Rx.
To recombine them without modifying the Rx we could use this or something similar http://paparazzi.enac.fr/wiki/MeekPE_PPM_Encoder_Board#Source_files or this http://paparazzi.enac.fr/wiki/ATmega328_PPM_Encoder_Board

Those with a EzUHF radio should perhaps read this http://fpvlab.com/forums/showthread.php?8741-EzUHF-8-PPM-out-on-paparazzi
This may help but I doubt it
Almost all the Futaba receivers came with the BU4015BF Shift Register chip, if your are able to locate this chip, you just need to solder a single wire in the pin 1 or 9 (clock), and you are done!


And this may even be true
For the FASST 6 and 7 channel receivers, you can solder a wire inside to get the first 5 channels of PPM, but channels 6 and 7 are not in PPM sequence. If you need more than 5 channels in the PPM stream, you'll need a PPM encoder.

The 8 and 14 channel FASST receivers are right out, and don't have any PPM order hidden inside. If you plan to use one of those, you'll definitely have to use a converter.


Thats about all I can find with a short search
lOOk....It's working perfectly........Lets fix it
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Re: PPM out of a Rx

Postby Alistair » Fri Mar 22, 2013 8:07 am

Wow that was fast Chris. Even managed to turn back time a few hours. It was an 8ch FASST rx so it sounds like the encoder is the only way to go. He has tried 2 of those and had problems.
Thanks
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Re: PPM out of a Rx

Postby cholme » Mon Mar 25, 2013 12:16 am

It's a matter of supplying exactly what the Tx expects, the encoder is a trivial problem: a micro-controller and a tiny amount of code is all that is required. The ones he has had trouble with, if he using them correctly, may be sending a PPM train that is not quite what the tx is expecting as there are several ways this can be done.
lOOk....It's working perfectly........Lets fix it
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