If you have not already, remove the XM240 coax from the switch and replace
(on any port) with the TH7. If the SWR is normal, your problem is likely
with the XM240 grounding the TH7 in some way.
Keith NM5G
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Pat Chiles
Sent: Tuesday, December 07, 2004 9:09 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Problem That Needs Ideas
Good Morning,
I spent my morning troubleshooting the problem I am about to describe out in
the rain. It has been dogging me for two days
I have a new tower installation. On the tower I have a 2 el 40M yagi at
68.5 feet and a TH7 at 56 feet. They play very well together by the way
with the XM240's reflector grounded and 12.5 ft of separation. I am trying
to feed these two antennas through a Ameritron antenna switch that was
given to me. I initially had problems with the switch, but a good cleaning
of all conducting surfaces and contacts has it working great with the 40M
yagi, but it gives me an off-the-scale swr with the TH7 on all ports.
I have tested a port as good with the 40M yagi and then put the TH7 on the
same port and get infinite swr. I them remove the TH7 and connect it direct
to the input cable using a barrel connector and it works as designed.
I have tested the TH7 while simulating the bend it has when connected to the
switch and can't get it to short out. Take it off the barrel connector and
put it back on a known good port (tested with the 40M yagi) and it fails
again. Does anyone have any ideas what to test next?
The switch is at the end of 60 feet of RG213 and the TH7 is fed with 60 feet
of RG213 from the switch. Just before the balun on the yagi I have 10 loops
of coax in a 10 inch diameter. All coax and connectors are new.
Thanks, Pat, K8PC
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
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