[TowerTalk] Matching 40M

[DALE LONG]

Tony
For years I used a simple tuned stub inserted in the 40m feedline, (in lieu of a tuner). I would use it only for the contests. Somehow through station changes I lost it or used the coax for something else, so I put a tuner in the 40m feedline.  It really doesnt require much tuning, and the effectiveness of your antenna is unchanged.  The tuned stub was a simple, one-time fix for SSB contests.

Dale - N3BNA


      From: "N2TK, Tony" <tony.kaz at verizon.net>
 To: john at kk9a.com; towertalk at contesting.com 
 Sent: Monday, November 7, 2016 9:32 AM
 Subject: Re: [TowerTalk] Matching 40M
   
Hi John,
It would be nice to add a cap. But I won't climb a crank-up without cranking
it down. And this would be a pain. Trying to find an easier solution.
73,
N2TK, Tony 

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
john at kk9a.com
Sent: Monday, November 07, 2016 8:31 AM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Matching 40M

Could you install a switchable capacitor antenna feedpoint?

John KK9A


To:    <towertalk at contesting.com>
Subject:    [TowerTalk] Matching 40M
From:    "N2TK, Tony" <tony.kaz at verizon.net>
Date:    Sun, 06 Nov 2016 12:04:59 -0500

Years ago some of us used an L-C network made from a variable cap and a coil
to make the amp happy at the top end of 40M with our shorty-forty's.

I now have the same problem with a 3-EL 40m that is tuned for CW. The amp
does not like to put out much power at the high end of the band. Is it
possible to update that old circuit with a ferrite core and some doorknobs?

Has anyone tried this? Would I have issues with circulating current or very
high voltages trying to put this into a box to put on the output of the
1500W amp for phone contests?

I realize this does not treat the high SWR on the coax. I could put the box
at the base of the tower so that there would only be about 50' of coax to
the antenna if that makes things "better".



Tnx for any feedback

N2TK, Tony


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