Mike
I have had good luck by using a small tripod holding a 10 ft TV mast on
which I temporarily mount the beam and then make swr adjustments to the
antenna. So far several+ beams of HF single band or tribander as well as VHF
beams keep their SWR after being mounted on 50ft, 70ft and 135ft towers.
Joe k3wry
In a message dated 4/29/2011 9:16:13 P.M. Eastern Daylight Time,
john@kk9a.com writes:
I don't think you can check and antenna SWR this way. If you could pull
it
up 40' or tip it so that the beam is pointing toward the sky, you may get
more usable data.
John KK9A
To: towertalk reflector <towertalk@contesting.com>
Subject: [TowerTalk] SteppIR SWR question
From: Mike <nf4l@nf4l.com>
Reply-to: nf4l@nf4l.com
Date: Fri, 29 Apr 2011 17:01:02 -0400
My 4L SteppIR with the 30/40 M trombone is on sawhorses in the front yard.
It
was
down to replace the driven element motor. The climber and crane are
scheduled
to put
itback on the tower tomorrow morning.
After I replaced the motor, I ran an SWR check from 7.005 to 29.5. The SWR
ot
the
lower end was 7.2, lowering as the frequency went up, til at 29.5 it was
1.0.
Considering the proximity to ground, I can accept that range.
Today ( 10 days later) I checked again, and the SWR range had gone up to
8.2
to
2.2.
Nothing has changed, except we had rain last night, so the ground is a tad
damper.
How concerned should I be, and what would you check? I really don't want
to
get
it in
the air and have a problem.
73, Mike NF4L
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