[NSRCA-discussion] Servo Signals

[Richard Lewis]

Sorry....there is no PWM implementation in our current radio systems signals to the servos.......

The TX/RX signal is a series of PPM pulse groups in a specific order, one for each channel.  Each pulse group in the signal represents a channel to the RX the RX decodes them and send the the appropriate Pulse Position Moduated signal to the individual servos....

PCM encodes more data into the signals and each "frame" of data contains position commands and failsafe info.  This is more like simplex serial communications.......


Richard



________________________________
From: Duane Beck <duane.e.beck at comcast.net>
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, June 20, 2009 8:07:33 PM
Subject: Re: [NSRCA-discussion] Servo Signals

Over-the-air transmitted signal is PPM.  The RX separates each channel and sends PWM to the servo.

http://www.rcgroups.com/forums/attachment.php?attachmentid=2474091
http://www.pabr.org/pxarc/doc/pxarc.en.html#opwm_ppm

Duane

Richard Lewis wrote:
> More accurately it is a pulse position signal.  The RX sends a beginning pulse that the RX recognizes and then a position pulse at a later time.  The time between the start pulse and the position pulse is the absolute position that the servo is commanded to move to.
>  Link to a tutorial:
>  http://www.hooked-on-rc-airplanes.com/servo-tutorial.html
>  Richard

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