Mike,
The manual Ten Tec tuners have a 4:1 voltage balun in them (misnomer; it's
not really a balun because it doesn't reject common mode current). I don't
know if the 253 has this or not, but if it does, you could try using it at
low power, just to see if the 4:1 impedance helps you find a match on .
If it does help, then I would build an external 4:1 current balun - but use
two toroids, not just one.
73
Rick, DJ0IP
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Mike Bryce
Sent: Thursday, October 31, 2013 8:52 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] 160 meters, ten ted 238 tuner, part two
Rick,
I'd give that a try but I don't have a 4:1 balun in the shack.
Mike Bryce
prosolar@sssnet.com
On Oct 30, 2013, at 5:20 PM, Rick - DJ0IP / NJ0IP <Rick@DJ0IP.de> wrote:
> Mike, just for a quick test, insert a 4:1 balun, between the openwire
> and the 1:1 current balun.
> Just insert an SO-239 between the 50 Ohm side of the new balun and the
> antenna side of the 1:1 balun.
> Only use that balun on 30m. In general you will be better off with a
> 1:1 balun but you might need a step-up transformer in front of it.
>
> Although a current balun is usually the preferred solution, because
> you still have the 1:1 balun in-line, the 4:1 can even be a voltage balun.
>
> 73
> Rick, DJ0IP
>
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