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[TowerTalk] FW: R7000 VSWR Problems

To: <>
Subject: [TowerTalk] FW: R7000 VSWR Problems
From: (Tim Billings)
Date: Sun, 7 Jun 1998 13:38:49 -0300

-----Original Message-----
From:   Tim Billings []
Sent:   June 7, 1998 1:38 PM
To:     ''
Subject:        FW: R7000 VSWR Problems

-----Original Message-----
From:   Tim Billings []
Sent:   June 3, 1998 8:24 PM
To:     ''
Subject:        R7000 VSWR Problems

HI.....I am an owner of a R7000 Vertical and I have been having problems in 
trying to 
lower the SWR on this antenna. The 10M, 15M and 17M band VSWR is fine...But I 
have been unable to 
lower the VSWR on 20M and 40M.

I have tried the following...
* Tested antenna at both feedpoint and at transmitter with no noticeable change 
* Changed out coax feedline in an attempt to find problem in coax.
* Tested VSWR with 3 meters (Autek, radio, tuner)
* Relocated antenna
* Varied height above ground.
* Adjusted the lengths of the antenna sections in question.
* Checked the VSWR readings with another  MN7000.... No change
* Cleaned all contacts and joints
All the above resulted in no changes in the high (6 to 9) VSWR.

HOWEVER.... I did disassemble the top two traps and cleaned the contact points. 
When I reassembled
the traps and reinstalled the antenna with the dimensions as per the manual... 
the VSWR was low...1.2 to 2
on the two bands in power (80 to 100 watts) was applied the 
VSWR climbed again to
6 to 9 on the 20M and 40M bands.

I am looking for solutions to correct the problem....Can you help ???

73 de Tim VE9XA 

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