That is an excellent setup, John. Nice choice.
I'm a friend of that antenna too and have used it most of the time for the
past 50 years.
Can't run openwire at this QTH so I had to develop a different antenna that
works all bands with coax, no matchbox - except of course to tune across the
entire 80m band.
The 238 is a great matchbox. I have one too. Used to use it with openwire
with a home-brew balun built after a circuit recommended to me by Bob
(K4TAX).
Your description of the balun isn't enough to say whether or not it is OK;
it's not just a matter of having a big core inside, it also counts "how it
is wired". Being "Military" is meaningless. The military bought a lot of
bad stuff as well as good stuff. But if you are not having any problems,
then it is probably OK.
On bands it won't load, simply add 1/8 wavelength of additional feedline and
I'm certain you will find that it then loads OK.
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
73 - Rick, DJ0IP
(Nr. Frankfurt am Main)
-----Original Message-----
From: John F. [mailto:k4avx1@windstream.net]
Sent: Tuesday, September 09, 2014 7:16 PM
To: tentec@contesting.com
Cc: Bob McGraw - K4TAX; Rick - DJ0IP / NJ0IP
Subject: re: Eagle Tuner
I've been a little fuzzed up with computer problems - think I missed some of
the discussion. I use a center fed zepp, 130' long, fed with 450 ohm
plastic covered open wire. It's fed through a big military surplus balun,
big cores, inside an sealed aluminum box outside. 4 or 5' of RG-8 out to
that from a TT 238 tuner. It loads well on almost all bands, and seems to
have a decent signal, as shown in the recent W1AW/KY exercises.
I also have a Cushcraft Mini-beam at about 40' which isn't great, but gives
a little boost. Ten-Tec Hercules II matches up well with the Eagle, and a
friend gave me the Amp switch made by WB8VGE, which works like a charm. I
can't tell its operation from the full break-in operation with the Omni Vi+.
(Which is
in Sevierville for a 20 year checkup right now.
Really enjoying the Eagle.
73,
John, K4AVX
> Message: 3
> Date: Tue, 9 Sep 2014 09:33:54 -0500
> From: "Bob McGraw - K4TAX"<RMcGraw@Blomand.net>
> To: "Discussion of Ten-Tec Equipment"<tentec@contesting.com>
> Subject: Re: [TenTec] Eagle Tuner
> Message-ID: <0A929A3D3D8345A5B703110D42D859D7@FAMILY>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Yes, most internal tuners are very limited with a matching range SWR
> of typically 3:1 or less. The design of the Tentec internal tuners
> provides for the SWR matching range to be typically 10:1. Of course
> external tuners will likely have a much wider matching range. For use
> after the amp I use a Tentec 238 for the coax fed antennas or for the
> balanced fed antennas I have a dual roller home brew balanced tuner.
>
> 73
> Bob, K4TAX
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