PCM lock out servo mvt

[Dave Reaville]

FWIW Prior to the first flight of the day, on my WC2 I do this failsafe check (turn off TX) every time I do the range check .  Works every time :-) Having had a plane (different brand TX/RX) go out of control previously, the fail safe did work and, although I lost the airframe, the plane posed no threat to anyone or anything.

Dave    


----- Original Message ----- 
  From: Bob Richards 
  To: discussion at nsrca.org 
  Sent: Thursday, March 10, 2005 11:24 AM
  Subject: Re: PCM lock out servo mvt


  Troy,

  > The PCM S used on JR radios today doesn't allow it
  > to be turned off.

  I stand corrected!

  > Now there is an older version of PCM
  > that JR still supports called ZPCM the Z was a 512
  > PCM and it allowed you to
  > set the time delay before it kicked in. And it could
  > possible have been a
  > turn off thing....I'm not really sure on it as I
  > never ran ZPCM.
  > 

  That may be what I am remembering.

  > 
  > Next issue JR and Futaba both send their "failsafe"
  > signal about once every
  > 15-30 secs or so. I never counted. But if you turn
  > everything on...and the
  > system has not sent the F/S signal yet...then when
  > interferance happens the
  > PCM will not know what to do. So here is my
  > suggestion. Turn TX and RX
  > on...let it stay on for about a minute....then turn
  > TX off and wait. to see
  > what's up.

  The Futaba sends it once every 60 seconds, if I
  remember correctly. It also sends it when you first
  turn on the transmitter. My normal procedure is to
  turn the receiver on first, then the transmitter.



  > ----- Original Message ----- 
  > From: "Bob Richards" <bob at toprudder.com>
  > To: <discussion at nsrca.org>
  > Sent: Thursday, March 10, 2005 7:30 AM
  > Subject: Re: PCM lock out servo mvt
  > 
  > 
  > > Ed,
  > >
  > > I'm no expert on JR radios, but I'll take a stab
  > at
  > > it. If anything I say is not accurate, someone
  > please
  > > correct me.
  > >
  > > As I understand it, the JR radios allow you to
  > turn
  > > off PCM altogether, which means that it will try
  > to
  > > respond to whatever signal comes along, whether it
  > is
  > > a real signal or interference.
  > >

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