REFLECTOR: Nav/Comm Coax in FB Wings

Christopher Martin christophercmartin at earthlink.net
Tue Aug 29 01:05:55 CDT 2006


One hold CB radio trick was to hold a florescent tube next to a antenna
while you key the mike. The radiating antenna will cause the tube to
fluores. Transmitting over the a nav antenna will not hurt it.

Christopher Martin
christophercmartin at earthlink.net



> [Original Message]
> From: Dave Black <dvblack at comcast.net>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Date: 8/28/2006 12:43:46 PM
> Subject: Re: REFLECTOR: Nav/Comm Coax in FB Wings
>
> bdtopp at comcast.net wrote:
>
> >    I am having difficulty determining which of the coax cables exiting 
> > the wing roots is the Comm cable and which is the Nav cable.
>
> I remember a few years back when I asked Alan Shaw this question, he 
> suggested I pull on the cables. Since the Comm cable is longer, it would 
> stretch more.
>
> That test proved inconclusive for me, but I was able to determine which 
> was which through the use of an antenna analyzer. Connect it to one 
> cable or the other, then run your hand along the wing or winglet. When 
> your hand passes the associated antenna antenna, you'll see an increase 
> in SWR on the analyzer. The NAV antenna is in the wing, while the Comm 
> is in the winglet.
>
> If you don't have access to an antenna analyzer or SWR meter, just 
> connect the antennas one way or the other. No harm will be done if you 
> get it wrong. But you'll get better reception one way than the other.
>
>
> dave black
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