I have had the same problem on 10m for a few years with my TH7. I have
replaced the traps, cleaned every joint of the antenna, replaced the balun,
but no luck in getting a good SWR on 10m. I still have the 2 dips on 10m -
27.6 and 28.9 with the latest settings on element lengths. Maybe the A3WS
that is 10' above it is causing the problem??? My highest SWR on 10m is
around 28.2 - 2:1.
Next month the TH7 will be coming down to be used as a fixed antenna to the
south. Will see what happens to the SWR when it is by itself.
Tony
-----Original Message-----
From: owner-towertalk@contesting.com
[mailto:owner-towertalk@contesting.com]On Behalf Of Mike & Coreen Smith
Sent: Saturday, September 15, 2001 13:26
To: towertalk@contesting.com
Subject: [TowerTalk] TH6 SWR on 10m
Has anyone ever had the "resonant" dip on their TH6 appear way down on 27.6
Mhz or lower?
I have a TH6 @ 42' and the SWR's low points (1:1) are
20.870MHz , 14.100MHz & 27.6MHz
On 15m/20m it's not too much of a problem as the bandwidth is wide enough to
pretty much cover me on the CW and LO-Phone portions of the band, but on
10m it's too low and the dip is quite sharp
Seems it's set a wee lower than it should be in freq for 10m. There's also a
dip on 28.9MHz (2.1:1)
My real question is whether I can change anything by removing only the
driven element. Taking the entire beam down is pretty much out of the
question. I "think" I might be able to remove only the driven. (anyone
tried this?)
I am feeding it with about 75' of 3/4" 75Ohm CATV line.
Michael, Coreen & Corey Smith
(VE9AA, VE9AAA & Baby-VE9)
271 Smith Rd
Waterville, NB
E2V 3V6
Canada
http://members.tripod.com/~ve9aa/index.html
http://www.geocities.com/RainForest/Vines/2174/
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