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
