I've not been successful in getting the 238 tuner to work on 6 meters.
Maybe just my antenna combinations but can't get a 1:1 match with a 50 ohm
load on the output either. So I figure the stray inductance and capacitance
inside is just too much. Not surprised however.
73
Bob, K4TAX
----- Original Message -----
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
To: <tentec@contesting.com>
Sent: Friday, April 11, 2008 6:38 PM
Subject: Re: [TenTec] Ten Tec 238A settings?
> On Fri, 2008-04-11 at 16:11 -0700, Denton wrote:
>> Dug out my trusty link coupled transmatch that is made exclusively for
>> twin
>> lead and pressed it into service. Have found another tap that give me
>> less
>> sharp tuning range for 75 and 80 meters....now to find something for 6
>> meters.
>> Will probably take the ten tec 238a and a couple of LDG auto tuners to
>> the
>> Yakima hamfest in the morning and see if can do some horse trading.
>
> I've built a couple 6m tuners. Usually about 4 or 6 turns of #12 1"
> diameter with a little gap in the middle for an adjustable link. Tuned
> by a split capacitor probably 35 pf each section, either dual or
> butterfly capacitor. Two turn link of insulated 12 gauge wire. Move it
> in and out or fix the link and put in a 50 pf variable series capacitor
> on the link ground side. Tap the antenna balanced feed line a couple
> turn out from the center link gap. I used one of those to tune an 80
> double extended Zepp for years. Worked great in the directions it worked
> good, lousy between the many lobes.
>
> 73, Jerry, K0CQ
>
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