[CQ-Contest] [TowerTalk] Coax Stubs for SO2R

[Dave Hachadorian]

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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