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Permalink Reply by Corey McGuire on March 1, 2012 at 5:06pm

I, too, would like some help here.  I haven't seen instructions on how to activate PPM (apart from this post, thanks!)

I have Spektrum Satellite receivers.  I even bought the level shifter along with my APM2 (if that is even needed).  I have the APM2 working with a normal receiver but I would really like to reduce the wire mess.

Where do I start?  My googlefu has failed me.

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Permalink Reply by Marc LE BRET on March 2, 2012 at 1:11am

There is some info in the Wiki and a msg at the end of the PPM sum wiki page. Somebody had some success with his PPM Sum. PPM Sum Wiki

No luck with the Futaba receiver.

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Permalink Reply by Fressinet Jean Louis on April 15, 2012 at 10:24am

Were you successful connecting your Spektrum satellite receiver on APM2 from my side,I tried everything described in the wiki on "PPM Sum " the satellite bind with the transmitter DX8 ,(I feed the satellite receiver with 3.3volts) orange LED ON  but looking in MP "Radio calibration" nothing move .

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Permalink Reply by Marc LE BRET on April 17, 2012 at 12:47am

Hello,

It is like APM2 is looking for an 8 channels signal. If the PPM sum is with 7 (Futaba) or less, there is no luck.

I ordered a FrSky Futaba 8 channel PPM sum compatible receiver. Keep you in touch if I have some good results with it.

Marc

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DeveloperPermalink Reply by John Arne Birkeland on April 17, 2012 at 2:32am

If I remember correctly the problem with PPM modified FASST receivers is that the hacked PPM signal is not standard (inverted).

Number of PPM channels should not matter as long as it is 8 channels or less. The APM2 decoder just increments a channel counter each PPM pulse, and resets to zero when it receives the PPM termination pulse. So having for example 5 streams just mean that the value of the last 3 channels will never change.

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Permalink Reply by leachim on April 20, 2012 at 11:06am

My PPM sum of my FrSky TFRSP (Futaba compatible) also didnt work with ArduCopter. But it worked perfectly with ArduPlane.

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