[TowerTalk] M2 KT36XA SWR Problem

[Dave Hachadorian]

My standard approach to troubleshooting KT-34 issues:

Connect a dc ohmmeter between the 10 meter and 15
meter trap capacitor outer tubes on each element half.
After correcting for ohmmeter lead resistance, the
total resistance should be less than 0.5 ohm. This
one measurement tests all of the critical connections
on each element half.

Then connect the ohmmeter across the two halves of
the rear driven element. Once again, it should read
less than 0.5 ohm. This one measurement tests all
the connections through the phasing straps, matching
assembly and balun.

Here is a collection of resonance data measured by several hams 
for the KLM and M2 antennas:
http://www.docstoc.com/docs/100250806/Larry-SV

Your measurement of 14.5 for the rear driven indicates that 
something is wrong there.

Dave Hachadorian, K6LL
Big Bear Lake, CA




-----Original Message----- 
From: Bud Trench
Sent: Saturday, June 29, 2013 9:06 AM
To: towertalk at contesting.com
Subject: [TowerTalk] M2 KT36XA SWR Problem

I am experience a problem with one of my KT36XA.

It is an original M2 KT36XA installed in 2009.  It had a decent 
SWR when
first installed on all bands with a low point at 14.1 MHz on 20M. 
Recently,
I've noted a high SWR on 20M.  The SWR low point is now 14.5 MHz.

I disconnected the feed to the rear driven element.  The front 
driven
element shows a SWR low point at 14.2 MHz and the rear driven 
element is at
14.5 MHz.

I have visually inspected the elements and can't see anything. 
Any advice
or thoughts?

73 Bud AA3B

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