[TenTec] O.T. High-PWR Balanced Matchboxes

[Rick - DJ0IP / NJ0IP]

Hi Mike

 

Yes, Rick's Balanced Balanced Antenna tuner has been around for almost 25
years.

Trouble is, it's a pretty hefty home-brew project.

I think most people are over-challenged building something that has to
mechanically synchronize two roller inductors and switch capacitors back and
forth across them.

 

I do not want to get into home-brew solutions at all.

That is a can of worms I don't wish to open.

I think people with enough knowledge to home brew something like Rick's
matchbox, don't need my advice.

They probably know more than I do. (hi)

 

Exception:

I did put up the home-brew S-match because it is a totally EASY project.

It has one coil, one capacitor, one transformer on a big toroid (easy to
wind), and there is no switching.

Almost anyone can build one of these.

 

I'm going to find a good used Annecke Asymmetrical tuner (they are much
easier to find than the Symmetrical Koppler).  The asymmetrical tuners are
T-Networks.  I will remove one capacitor, and build the toroid transformer.
With that, the S-match is 95% complete.  I just have to modify the wiring.
By doing it that way, all of the mechanical construction is already done,
and I have a nice roller inductor with turns counter.  Then I will run a
bunch of tests comparing this to other matchboxes on an openwire-fed dipole,
while measuring the RF-Current into each leg of the feedline.  This will
give me an indication of how effective the S-match is.  I have great
expectations, but usually in those cases, I am disappointed in the end.
Keep your fingers crossed.

 

I have gotten a few good suggestions since yesterday.

Already added a couple to my web site.

One more to add.

 

Gotta do some real work today.  

I spent too much time on my web site and have fallen behind in the work I
get paid to do.

 

73

Rick, DJ0IP

 

 

 

 

-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of Mike
Stricker
Sent: Wednesday, March 06, 2013 3:29 AM
To: tentec at contesting.com
Subject: Re: [TenTec] O.T. High-PWR Balanced Matchboxes

 

Let's not forget about this interesting link:

 <http://www.somis.org/bbat.html> http://www.somis.org/bbat.html

Mike, WA1SEO

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