Yes, a pennant antenna with a pre-amp could be a tremendous help. I live in a
densely populated suburb where everyone (including us) has all the latest
digital noisemakers. Without that set-up, the lower bands would be completely
useless to me. Also, add common mode chokes to both ends of the lead from
your receiving antenna. Otherwise, it can pick up a lot of noise on the way
into the shack, some of which finds its way into the received signal.
Fair-Rite makes a large snap-on choke that’s ideal for the purpose (Fair-Rite
0431177081). Wrap 7 turns of your coax through it, and spread the turns out
over the full circumference of the choke so they’re as far from one another as
possible. (See “A Ham's Guide to RFI, Ferrites, Baluns, and Audio Interfacing”
by Jim Brown, K9YC, which is available on the internet.)
Hope this helps.
Art Delibert, KB3FJO
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
From: John Randall via Topband<mailto:topband@contesting.com>
Sent: Saturday, October 28, 2017 9:14 AM
To: topband@contesting.com<mailto:topband@contesting.com>
Subject: Topband: Common mode current and QRN on 160m
I have built up a simple switch box to use on 160m which reduces the QRN a bit
on the band so that I can see the weaker stations out there. My noise level is
usually s9 and am going to try a 1:1 current balun at the antenna feed point
which is a 45mm dia 6m high pole bottom fed. I have about 15 - 20 radials in to
fit my garden 30ft x 30ft, but neeed to improve my reception and the QRN. Any
suggestions on how to cut the local "smog" other than what I am trying. The
pole is mounted abot 3ft away from the garden corner ( not ideal ), but it has
to be there. I was thinking about another antenna for receive such as a pendant
or such like mounted above the roof and use a small rotator with preamp, that
should reduce the QRN even further
73John - M0ELS
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