Because it is 4:1.
You are better off with a 1:1 balun.
For a better understanding of this, see Steve's page on Tuner Balun: 4:1or
1:1?
Here: http://www.karinya.net/g3txq/tuner_balun/
73
Rick, DJ0IP
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Mike Bryce
Sent: Thursday, July 11, 2013 10:21 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] OCF antennas evolution
Why not use the internal balun in the 238?
Sent from my iPhone
On Jul 11, 2013, at 3:00 PM, "Rick - DJ0IP / NJ0IP" <Rick@DJ0IP.de> wrote:
> Mike, the tuner was not designed for 400 Ohms and you won't see any
> noticeable difference.
>
> Once you get to the shack with your openwire, you need to run it
> through some sort of a balun to the tuner, OR you can use the built-in
> balun, WHICH I DO NOT RECOMMEND.
>
>
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