nuckolls.bob(at)aeroelect
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 Posted: Fri Nov 30, 2012 5:44 am Post subject: Using a Handheld radio to "Sniff" for RF leaks behind the |
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At 06:04 AM 11/30/2012, you wrote:
[quote]Mr. Bill,
If you key the Garmin 430 and it results in three items "shutting off," I will suggest that it has nothing to do with RF and has everything to do with your power system. If the transponder sometimes shuts off for no apparent reason, it adds credence to the power system being the culprit. You either have an intermittent connection or a significant impedance somewhere in your power system such that it deprives the three units of sufficient voltage to stay on.
If this problem can be duplicated on the ground, then may I suggest that you grab a competent airport bum to help you make voltage measurements throughout the affected areas in order to find the high impedance. If it cannot be duplicated on the ground, then a thorough analysis of what you have is in order, along with looking at each node to verify it is airworthy.
Good luck to you and your airplane.
Henador Titzoff
--- On Thu, 11/29/12, Bill Bradburry <bbradburry(at)bellsouth.net> wrote:
From: Bill Bradburry <bbradburry(at)bellsouth.net>
Subject: RE: Using a Handheld radio to "Sniff" for RF leaks behind the panel
To: aeroelectric-list(at)matronics.com
Date: Thursday, November 29, 2012, 2:49 PM
--> AeroElectric-List message posted by: "Bill Bradburry" < bbradburry(at)bellsouth.net>
I have a situation where the transponder, sometimes KMD150 moving map, and
sometimes TruTrak DigiflightII autopilot shut off when the Garmin DNS 430W
mike is keyed. I am assuming that I have a massive RF leak from the Garmin
coax that is causing this shutdown. I could be wrong because I have had
occasion where the transponder shut off for no apparent reason. I just
wanted to check for a leak.
I also plan to fab a coax that goes from the radio straight to the antenna
bypassing everything that it may be in proximity to in order to see if that
helps.
The more I think about this problem the more my head hurts!
Bill B
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