receiver antenna placement

[John Ferrell]

The Prophecys & Hydeouts that were produced by Dixie Competition Products had only small inclusions of carbon fiber that were seldom where I wanted them. 

I have no personal experience with carbon but what I have heard supports your experience. I have seen my share of "flukes" in the radio systems that defy explanation. Like the Y connector that causes servo jitter for no reason. 

I have always been leery of metal to carbon contact in the fuselages but I have no experience there.

The wire antenna on our receivers does not appear to be resonant and the pull pull cables are about the same length. I don't think there is any interaction there.

If I string a wire from the canopy area to the rudder or stab I am certain I will trip over it less than 30 days. 

You have to do what it takes to have confidence in the plane because nobody can fly one if they are expecting it to come apart!

John Ferrell    
http://DixieNC.US

  ----- Original Message ----- 
  From: Wayne Galligan 
  To: discussion at nsrca.org 
  Sent: Wednesday, February 25, 2004 10:31 AM
  Subject: Re: receiver antenna placement


  John 

  Those where fiberglass weren't they?   We are dealing with the c.f. composite planes causing RF interference.
  This has been hashed over many times but It is still an issue as Gray and I have both experienced carbon fiber fuse RF issues on several different setups.  The plane I flew all of last year is c.f. but I had the antenna on the outside and it used kevlar pull line on the rudder and c.f. pushrod with MK bellcrank with no RF issues.  The previous plane (same design and c.f. lay-up) was setup with metal pull lines on elevator and rudder and I had a very bad glitching issue when I ran the antenna back to the tail and on the outside too. I had to run the antenna out to the wing tip to cure the issue.     It is my belief that the combination of wire pulls and running the antenna parallel to the wires and the c.f. fuse where suspect as I tried three different receivers to no avail.  I guess the only way to have determined if it was the wire pulls at fault is to have changed pull lines over to kevlar. It is debatable since I crashed the plane (it crashed because of a failed pull line go figure) before I could change the lines over.

   Wayne Galligan.
    ----- Original Message ----- 
    From: John Ferrell 
    To: discussion at nsrca.org 
    Sent: Wednesday, February 25, 2004 8:57 AM
    Subject: Re: receiver antenna placement


    Most of the Prophecys and Hydeouts that were built by me had a DuBro antenna tube in the lower corner of the fuselage between formers and the glass. The tubes were $0.75 each. They were put in place with silicon adhesive. If not installed carefully, they could rattle. Most had Dave Brown push rods and Pull-Pull rudders. I never heard of a radio problem that was not a sick radio.

    John Ferrell    
    http://DixieNC.US

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