[CQ-Contest] [TowerTalk] Coax Stubs for SO2R
Dave Hachadorian
k6ll.dave at gmail.com
Wed Sep 9 23:00:57 EDT 2015
Ok.
Now that you have put a 23' shorted stub on 40, put a 23' open
stub on 20. This will reject any 40 meter energy that shows up
on your 20 meter feedline, and it will pass 20 just fine.
Dave Hachadorian, K6LL
Yuma, AZ
-----Original Message-----
From: Mike Smith VE9AA
Sent: Wednesday, September 9, 2015 5:09 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] [CQ-Contest] Coax Stubs for SO2R
Hi Dave,
It's an HF9V, so not really a "trap" vertical per se. It's
perhaps 2 yrs
old and still in nice shiny condx. I put it together with
copper paste as
well and there's still lots on it.
I've also tried to transmit on other antennas I have here as well
(low
CC-A3, 160m inv L) on some other band combos with other stubs
etc. and no
real change with stubs on the transmitter.
I am just trying to concentrate on the single 40m>20m QRM issue.
(so as not
to muddy the waters)
Once I get that hammered out, I can probably find my way from
there.
Tnx much..and yes, I practically have your page memorized by now,
hi !
(One of )The reason(s) I am going round n' round is:
A) Stubs do nada
B) Two prominent stations.one in EU, one in NA say I am doing
it
backwards.
Thanks all
Mike
It's a multi-band vertical... ugh... how long has it been since
you took it
apart and cleaned all the connections?? I had a tribander here
that caused
all sorts of harmonics, even when it wasn't connected to
anything, bad
connections to traps and between tubing causes all sorts of bad
things.
Also, this is just the single stub, not the pair that does the
3rd harmonic
of 40m-15m?? so it should only work on the harmonic from 40m to
20m or 10m.
David Robbins K1TTT
Mike, Coreen & Corey
Keswick Ridge, NB
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