Re: [Repeater-Builder] Repeater 'noise' problem

5 Dec 2004 15:55:03 -0000

     I personally have experienced more problems due to the antenna rods being loose especially the Diamond colinear antennas.  I have not had problems due to 9913 cable usage before, its not out of the realm of possibilities but I would suspect the connectors and how they are installed more than the 9913 itself.  I have used lots of LMR-400 in the past without any complaints.
 
Wade - KR7K
 
 
----- Original Message -----
Sent: Saturday, December 04, 2004 8:52 PM
Subject: Re: [Repeater-Builder] Repeater 'noise' problem

Gee now this sounds like a DITTO.  Had the exact same problems today with the repeater here in Indiana.  Most of mine was due to a piece off 9913 that was in line, and yes I know it was not suppose to be there, temporary situation.  Anyways, replaced that with hardline and took care of most of it.  I have to agree with the other post, as my situtation is a temporary one until next spring.  The winds were high in the area and was causing alot of disturbance on the tower.  My guys are all new infact was just recently put up two months ago.  I am using a fiberglass antenna which inside most of them there is loose rods, so I blame a part on that as well.  If more than anything, if it happens when the wind is blowing, then it's movement on the system somewhere.  WInd died down this evening and all is gone.
 
Mathew
 
 
All,
 
I am trying to resolve a problem on a local repeater where they are having intermittent 'noise' problems. 
 
Background:
This a commercial GE repeater that has been modified for 2m use.  When the noise is not present the repeater performance is outstanding with a wide coverage area.
The following have been replaced with new and had no effect:
  - tranmitter/receiver
  - antenna (super station master)
  - hardline from duplexer to antenna
  - repeater controller
 
The noise may be related to weather (wet or cold causing an increase in the problem) though it is not a everytime event. 
 
It was originaly believed that it was a grounding problem but grounding improvements have had no lasting effect.
 
At one point it was said that the guy wires were causing the problem so the club recently put insulators in all 9 guy wires about 6 to 8 feet from the anchor point - no help.
 
The problem, which sounds like static or popping, occurs only during transmitting incoming audio.  In other words, all controller generated audio is fine, no noise what so ever.
 
I am wondering if we are looking at a problem in the duplexor.  One because it is the only peice of the system that has not been changed (although it was checked out by a professional RF engineer using state of the art equipment about a year or so ago - but he was just looking to tune it to the right frequencies).  Two, because the only time there is a problem is during transmitting received audio.  We are going to go and check all of the interconnections in the duplexor, but I thought I would ask the group if they had ever experienced anything similar, and ask for suggestions.
 
Thanks and 73,
Rick
W2RDS


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