[TowerTalk] Dummy Load

[Michael Ryan]

Scott, I might have missed this but what BRAND of antenna is this?  If it is
an M2, take a very hard look at the gamma match.  The one on my 7ele is of
72ohm cable. The cable was cut and "F" connectors were attached to the ends.
The center conductor on ONE side of this was not LONG ENOUGH to make contact
with the CENTER conductor attachement point, where of course your FEEDPOINT
from your station's coax is.  I ended up having to alter this slightly to
make sure that enough of the center conductor of that 72ohm cable made
contact inside it's female counter part up there.  Just a thought.  - Mike



-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Fred Mott
Sent: Sunday, April 26, 2009 6:26 PM
To: 'Scott MacKenzie'; towertalk at contesting.com
Subject: Re: [TowerTalk] Dummy Load

It "The Tree" looks like the world's largest dummy load!  Fred

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Scott MacKenzie
Sent: Sunday, April 26, 2009 8:44 AM
To: towertalk at contesting.com
Subject: [TowerTalk] 6M Beam being weird

All:
 
I have a 6M beam that is showing high SWR (10:1).  I checked each connector
to the antenna by disconnecting and placing a dummy load.  Finally up at the
antenna, I disconnected the antenna, and placed the dummy load as the
antenna.  Readings were 1:1 SWR.  I then clean up the connector at the
antenna, and retest.  SWR is still high.
 
I then pull down the antenna (K1FO or similar - not M2) and check it out.  
 
With the coax disconnected, I check the connector - good continuity from the
center pin to the otherside of the connector (where the gamma match is
attached.  
 
I check from center pin to ground on the conductor to see if shorted -
Circuit is open.
 
I check to make sure I have continuity between outside of gamma and rest of
antenna. Circuit is fine - and shows continuity.  
 
The only thing I can think of left is to replace the coax less shield inside
the gamma.
 
What else can it be?
 
I was hoping to get this up higher in the air for the summer Es season.
 
Thanks
 
Scott
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