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
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Mike Bryce
Sent: Wednesday, October 30, 2013 8:12 PM
To: Discussion of Ten-Tec Equipment
Subject: [TenTec] 160 meters, ten ted 238 tuner, part two
Well gang,
It's great being able to move again and once more I'm in the shack.
I did some interesting testing with my doublet.
here's a recap
132 feet on each side fed with 180 ish feet of 600 ohm open line. That goes
to an external 1:1 balun feed with three feet of LMR400 to the coupler.
A palstar coupler and the Ten Tec 238 coupler were unable to find a match.
So I added 15 feet to both ends.
No joy.
I added about 10 feet of wire inside the shack and strung it across the
ceiling. Looks like hell, but it's up there
The palstar will find a solution at 1.890 now, but the swr is around 2.7:1
The 238, not so much. I did get it to tune, but the SWR slowly increased (I
plan on modifying the coupler with the high voltage doorknob caps)
Now, here's the odd part.
I have a Ten Tec 253 AUTOMATIC tuner. That tuner found a solution for the
160 meter band from one end to the other.
Happy days!
But, using the same tuner, it can't find a solution on 30 meters.
But the 238 and the palstar will tune it flat.
I don't mind changing antennas, but swapping out couplers to operate from
one band to the other kinda sucks.
Mike WB8VGE
Knowledge is knowing a tomato is a fruit; Wisdom is not putting it in a
fruit salad.
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