Until a bath/bedroom addition, I ran a 40 ft vertical dipole fed with 450
ohm twin lead and a revamped johnson matchbox....it would even tune on 80
meters...was a great antenna on 20 meters! Radiation pattern according to
eznec was excellent from 40 (assuming a little loss) thru 10 meters.
----- Original Message -----
From: "Bob Cunnings" <bob.cunnings@gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Friday, December 07, 2007 11:25 AM
Subject: Re: [TenTec] Ten Tec 229 Tuner on 160M
> Yes, and if a horizontal doublet isn't practical, try going vertical!
> I've been using a 32 ft. vertical doublet (#14 insulated wire), center
> fed with 450 ohm ladder line, for years, hidden within a tree. A
> balanced-L tuner does the matching. The feedline runs 16 ft. above the
> ground, running horizontally from the feedpoint to the eave of the
> house, then down to the shack on the 1st floor. All the convenience of
> a multi-band doublet, with the characteristics of a vertical dipole
> (both the good and the bad).
>
> Bob NW8L
>
>
>
> On Dec 7, 2007 10:40 AM, Bob McGraw - K4TAX <RMcGraw@blomand.net> wrote:
>> This is one of those topics that gets visited from time to time. And as
>> always, there about as many opinions, ideas, experiences and preferences
>> as
>> there are stars in the universe.
>>
>> Wire, whatever length you have space to string up, fed in the center with
>> some balanced feedline direct to the tuner has always proven to be a good
>> working general purpose antenna. Balanced feeds are not near as fussy as
>> many will technically profess. I use both the 300 ohm and 450 ohm
>> material,
>> {window line} which I obtain from Press at Wireman. Whatever balance
>> method
>> that exists in your tuner will likely be satisfactory. Should your tuner
>> not provide a balanced output, then add a external balun of your choice.
>> I've used a W2FMI 4:1 balun rated at 10KW for my legal limit operation.
>> I've
>> also used a Radio Works 1:1 current balun rated at 5 KW for my AM
>> station.
>> Both seem to work equally well. My favorite is "the ugly balun" as
>> described on Rich Measures website. http://www.somis.org/bbat.html
>>
>> I only use coax fed antennas for those that are resonant frequency
>> applications. Case and point, my 75M dipole, length cut to formula, and
>> coax fed shows a 1:1 SWR value at about 3950. It covers some +/-50 KHz
>> {3900 - 4000} either side of that frequency with a 1.5:1 SWR or less.
>> The
>> radio and amp are very happy with this configuration and I typically
>> don't
>> use the tuner on this antenna for operation in the upper end of the band.
>> Now should I decide to do some PSK-31 work down at the low end of the 75M
>> band, I switch in the tuner, twiddle a couple of knobs and everything is
>> happy and works.
>>
>> For feeding the balanced lines/antennas the Tentec 238 does a very nice
>> job.
>>
>> Try it, you'll like it.
>>
>> 73
>> Bob, K4TAX
>>
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