nuckolls.bob(at)aeroelect
Guest
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 Posted: Mon Aug 31, 2015 7:41 am Post subject: Request for some direction and advise |
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At 10:15 PM 8/30/2015, you wrote:
| Quote: | I saw where someone else on the list a while back was discussing adding that connector to their TruTrak at the company’s suggestion. It is supposed to keep RFI out as I recall.
The antenna is glassed in and not removable, I tried to attach it with tape, but I could not get it to stay in place so I just glassed it in. I do have a second antenna that I could try if I don’t find anything with the coax. I only have a Volt-Ohm meter so I don’t think I could bench test the antenna.
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I feel your 'pain' . . . more than once
I have been presented with a conundrum
with tools and test equipment out of reach.
Do the touchy-feely things with the
feed line first. Then consider building
a test antenna. A simple dipole, fed at
center with a length of coax fited with
BNC cable-female to reach across the
aircraft to the opposite side where
you can tape it in place.
See if the problem resolves.
I don't know any specifics about the antenna
you have installed. I have been made aware
of several products like it wherein the
manufacturer thought it a good idea to
include a balun/matching transformer in
that little potted box at the center.
On such product could not handle the
power from the transmitter and failed
the balun after some hours in service.
We're grasping at straws here but one
of those straws IS the short one. Without
useful diagnostic tools . . . it's
the best we can do.
But if it's any consolation, I've encountered
ONLY ONE EMC problem on an airplane wherein
root cause could NOT be resolved . . . only
swapped out.
[img]cid:.0[/img]
Seems that some really nifty technology advances
in communications hardware were installed
on an aircraft being manufactured to still
adequate methods designed 40 years ago.
A technology that placed NEW and exceedingly
difficult requirements on the airframe.
From that time to this day, the aircraft has
suffered a host of EMC problems that occur
at intervals, sometimes in small batches,
and will never be resolved except that the
old wire-type antennas be re-installed.
I'm not suggesting that your situation is
intractable . . . only that not all combinations
of hardware are plug-n-play in all airframes
and yours is fixable.
Only spent a few hundred $K tracking the
other one down . . . yours will be MUCH
less expensive.
Bob . . .
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