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15 May 2014 09:12 #23255 by Pattaya01
PPM was created by Pattaya01
I'm not so sure if this has been asked before, so sorry if it is a double question.

I want to use PPM output on my Devo12S with Deviation. But I noticed when I choose the number of channels, it stops at 10. Can't I use 12 channels?
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16 May 2014 13:05 #23279 by Pattaya01
Replied by Pattaya01 on topic PPM
Anybody any idea?
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16 May 2014 13:20 #23281 by vlad_vy
Replied by vlad_vy on topic PPM
Not, with standard PPM frame length it's impossible. Ten channels is the maximum.
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18 May 2014 12:46 #23315 by Pattaya01
Replied by Pattaya01 on topic PPM
I've seen Tx's going up to 16 channels. How they do that?
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18 May 2014 13:43 #23316 by vlad_vy
Replied by vlad_vy on topic PPM
Probably they use non-standard pulse width or frame length.

(2.0ms * 16) + 4.0ms = 36ms or non-standard PPM
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31 May 2014 11:15 - 31 May 2014 11:18 #23780 by Pattaya01
Replied by Pattaya01 on topic PPM
The reason I asked is because I have an EzUHF for long range, and it is very flexible in accepting anything, even non-standard. I just received a Taranis, and within 5 minutes, using open TX, I had 12 channels working.

an example: fpvlab.com/forums/showthread.php?27271-PPM-frame-rate

I do agree it may be a non standard protocol, but as far as I am concerned, I don't care, as long as it works.

I guess it should be very easy to implement something "non-standard" in deviation as long as the user is aware it is "non-standard". So when you choose 12 or more channels, a simple warning that the protocol is no longer "standard" would do.

Is it possible to implement something like that?

I like my Devo12S, I like Deviation and I would like to see more and more features. I need more than 10 channels (that's why I bought the Devo12S in the first place) and maybe others are in the same position.
Last edit: 31 May 2014 11:18 by Pattaya01.
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31 May 2014 11:36 #23781 by sbstnp
Replied by sbstnp on topic PPM

Pattaya01 wrote: I had 12 channels working.


You sure it was 12?
Devo 10 + 4in1
Spektrum Dx9
FrSky Taranis + TBS Crossfire
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31 May 2014 12:58 #23783 by PhracturedBlue
Replied by PhracturedBlue on topic PPM
Yes Taranis allows more than 10 channels on PPM. Deviation does too now :)
The max # of channels calculation is:
(PW-notch) / (center + delta + notch)

so default is 11.
increasing the PW will allow you to have more channels.
Note that you are limited to the maximum # of channels supported by the radio (currently 12 for all radios)
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31 May 2014 13:20 #23786 by Pattaya01
Replied by Pattaya01 on topic PPM
Thanks. I knew it was possible... :)
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01 Jun 2014 13:18 #23819 by Pattaya01
Replied by Pattaya01 on topic PPM
Just installed the latest Nightly. Cannot increase to 12, 11 is maximum?????
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01 Jun 2014 13:32 #23820 by PhracturedBlue
Replied by PhracturedBlue on topic PPM

The max # of channels calculation is:
(PW-notch) / (center + delta + notch)

Should have said:

The max # of channels calculation is:
(Framesize-notch) / (center + delta + notch)


click on PPM and change the 'Frame Size' to 25000. That should allow you to fit 12 channels
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26 Oct 2014 07:09 #26170 by Kdean
Replied by Kdean on topic PPM
My PPM frame size only goes up to 22500.

Do I need to update to the current nightly?
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26 Oct 2014 20:34 #26177 by mikemacwillie
Replied by mikemacwillie on topic PPM
Yep, the nightly will have it.
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