Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Using a Handheld radio to "Sniff" for RF leaks behind the pa

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List
View previous topic :: View next topic  
Author Message
bbradburry(at)bellsouth.n
Guest





PostPosted: Thu Nov 29, 2012 10:25 am    Post subject: Using a Handheld radio to "Sniff" for RF leaks behind the pa Reply with quote

Please tell me again how you set the handheld radio up to accomplish this
task and how the testing is done.

BillB


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
henador_titzoff(at)yahoo.
Guest





PostPosted: Fri Nov 30, 2012 4:05 am    Post subject: Using a Handheld radio to "Sniff" for RF leaks behind the pa Reply with 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


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

--


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
dick(at)minetfiber.com
Guest





PostPosted: Fri Nov 30, 2012 8:05 am    Post subject: Using a Handheld radio to "Sniff" for RF leaks behind the pa Reply with quote

Hello;

I had a very similar problem on an RV-6. After a lot of trouble shooting I was under the panel when a wire I was touching moved. It was the main feed to the buss that supplied the radios. It was snug tight but not really tight and could be moved. My transponder and Comm would shut down in flight. I tightened the connection and never had the radios power off again in flight again.

Dick Wildman
[quote] ---


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
tim2542(at)sbcglobal.net
Guest





PostPosted: Fri Nov 30, 2012 8:35 am    Post subject: Using a Handheld radio to "Sniff" for RF leaks behind the pa Reply with quote

I think Hernador hit the nail on the head, but dont forget the ground side of the circuit. You are probably looking for a bad crimp somewhere. Get in there and start tugging on wires near crimped connectors while monitoring the avionics.
Tim
Sent from my iPad

On Nov 30, 2012, at 8:03 AM, "Dick Wildman" <dick(at)minetfiber.com> wrote:

[quote] Hello;

I had a very similar problem on an RV-6. After a lot of trouble shooting I was under the panel when a wire I was touching moved. It was the main feed to the buss that supplied the radios. It was snug tight but not really tight and could be moved. My transponder and Comm would shut down in flight. I tightened the connection and never had the radios power off again in flight again.

Dick Wildman
---


- The Matronics AeroElectric-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> AeroElectric-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group