REFLECTOR: Nav/Comm Coax in FB Wings
Dave Black
dvblack at comcast.net
Mon Aug 28 14:43:43 CDT 2006
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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