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Comm Radio Problem

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bhcishere(at)ca.rr.com
Guest

Posted: Sun Nov 25, 2007 7:14 pm Post subject: Comm Radio Problem

Need help from the RF guru's,

  

 I have been trying to resolve a problem with a  friend's comm radio for some time now with no success.

  

 Transmit is never a problem and reception is good  most of the time.  The problem is local to some areas, frequencies and  direction of flight.

  

 Specific example:  Depart CNO talking to SoCal  on 125.5, all is well when flying westbound.  On return leg  (eastbound) to CNO, unable to receive SoCal but the controller receives me  perfect (this is evident by other aircraft relaying messages from the controller  and the fact that once I can hear the controller he is not very happy).  It  does not appear to be an issue with SoCal as I can hear them when flying  eastbound with an Icom handheld.

  

 This same problem occurs in other areas also but is  very prominent in the example given.

  

 The same problem remains after multiple  changes:  KX-170B, Garmin SL-30, Stainless antenna, two different  fiberglass whip antenna's and have tried both top and bottom mounting.  The  only thing that has not (yet) changed is the coax which is currently  RG-58.

  

 I am at whit's end, any help or suggestions would  be appreciated.

  

 Bryan

   [quote][b]

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rnewman(at)tcwtech.com
Guest

Posted: Mon Nov 26, 2007 4:53 am Post subject: Comm Radio Problem

Bryan,    I did battle with my  Garmin 530 communications radio for months in my Glastar after an instrument  panel re-do.   It had been great for 7 years,  after the panel  overhaul.  I had similar communications problems.  At various times it  worked great, other times not at all.   Ultimately I found a bad coax  connection.   The shield of the coax was not making connection with  connector at the radio end.   It was one of those coax connectors that  uses a set-screw to connect the shield to the connector body.   It was  not a crimp on style.    I changed the connector to a crimp on  type and the problem has been solved.         We tried everything under the sun, including getting a loaner 530 from  Garmin,  but the smoking gun was in the connector.

  

  

 Bob Newman

 www.tcwtech.com

  

   [quote][b]

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nuckolls.bob(at)cox.net
Guest

Posted: Mon Nov 26, 2007 7:01 am Post subject: Comm Radio Problem

At 07:13 PM 11/25/2007 -0800, you wrote:



 	  Quote: 	
		  Need help from the RF guru's,



I have been trying to resolve a problem with a friend's comm radio for 

some time now with no success.



Transmit is never a problem and reception is good most of the time.  The 

problem is local to some areas, frequencies and direction of flight.



Specific example:  Depart CNO talking to SoCal on 125.5, all is well when 

flying westbound.  On return leg (eastbound) to CNO, unable to receive 

SoCal but the controller receives me perfect (this is evident by other 

aircraft relaying messages from the controller and the fact that once I 

can hear the controller he is not very happy).  It does not appear to be 

an issue with SoCal as I can hear them when flying eastbound with an Icom 

handheld.



This same problem occurs in other areas also but is very prominent in the 

example given.



The same problem remains after multiple changes:  KX-170B, Garmin SL-30, 

Stainless antenna, two different fiberglass whip antenna's and have tried 

both top and bottom mounting.  The only thing that has not (yet) changed 

is the coax which is currently RG-58.



I am at whit's end, any help or suggestions would be appreciated.


	


   Bob Newman has made an excellent suggestion that

   I can only echo. If your radio bench-checks okay,

   then something is amiss in the installation and the

   MOST likely culprit will be the antenna system. Since

   you can't do much to hose up a piece of steel

   once crafted into an antenna, this leaves the coax

   and connectors.



   See if you can get an SWR bridge to check your

   antenna's electrical performance and go over

   the connectors with a fine toothed comb.



   Bob . . .

        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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