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Re: [TenTec] TT 238A transmatch mods for 6 meters

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] TT 238A transmatch mods for 6 meters
From: Ken Brown <ken.d.brown@hawaiiantel.net>
Reply-to: ken.d.brown@hawaiiantel.net,Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 08 Dec 2007 09:27:37 -1000
List-post: <mailto:tentec@contesting.com>
> Anyone try any mods for a TT 238A transmatch to get it to work on 6 meters?
Probably possible, but not desirable. Consider the number of unused yet 
inductively coupled and shorted turns on the inductor. Better to have an 
antenna with low SWR on the feedline. If you are using open wire 
balanced feedline (the only kind you would want to use on six meters 
with a high SWR) then you would want to use a balun between the 50 ohm 
coaxial system and the balanced feeders that is optimized for six 
meters. Not one that is designed for MF/HF. If you must use a tuner on 
six meters, build one dedicated to six meters. Otherwise efficiency is 
bound to be poor.

ARRL has had a few articles about six meter tuners in older handbooks. I 
cannot recall ever seeing a bandswitched tuner that covered six meters 
and any other band. There is probably good reason for that. Look at the 
components in the handbook tuners for six meters, and ask yourself 
whether it seems reasonable to use the sized inductor and capacitor in a 
HF tuner for six meters.


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