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[aprssig] Pulse Position Modulation

Steve Noskowicz noskosteve at yahoo.com
Tue Jan 13 03:12:44 UTC 2009


   Position & PPM ... Hmmmm.  
  Not knowing just what you have in mind...  
  The system of control used in model aircraft (and model railroad and other places) uses PPM.  Hardware is easy to make or there are 6 and 8 channel ICs.  At least there were when I was into it.  It  sends analog information in the spacing between adjacent pulses.  If I recall, the frame rate is 10 per sec.  All 8 channels in 100ms. 
Oooooo  After all these years, I just realized... that's a byte!

  I also seem to recall some software that produces the signals.

--
73, Steve, K9DCI
You know that sea of entropy we were going to drown in?  Well, upon closer examination, it turned out to be ignorance.  S. Noskowicz 1987


--- On Mon, 1/12/09, Scott Miller <scott at opentrac.org> wrote:

> From: Scott Miller <scott at opentrac.org>
> Subject: Re: [aprssig] Pulse Position Modulation
> To: "TAPR APRS Mailing List" <aprssig at tapr.org>
> Date: Monday, January 12, 2009, 3:37 PM
> I was looking at that for sending positions from balloons
> with a xenon 
> strobe.  It works well for pulsed modes with a high peak
> power to 
> average power ratio.  It's not too complicated, and
> it's easy to 
> implement on MCUs with hardware counter/timers.
> 
> I can't see it being too useful at VHF or UHF, though.
> 
> Scott
> N1VG
> 
> Andrew Rich wrote:
> > Has anyone played with Pulse Position Modulation for
> transmission of 
> > position reporting technolgies ?
> >  
> > Andrew VK4TEC
> > 
> > 
> >
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