Thanks Vince....was thinking of homebrewing something similar, but did just
now drop Pat a line...think he lives in Yakima Wa, which is only a two hour
drive or so from Pendleton, Or...my qth.
----- Original Message -----
From: "Vince Bond" <k7na@adelphia.net>
To: <tentec@contesting.com>
Sent: Saturday, July 09, 2005 12:39 PM
Subject: [TenTec] Subject: Re: "Radiates like Crazy"???? No
>
>
> I will mirror the experiences of those who have tried feeding
> ladderline-fed antennas in the shack with unbalanced matching networks
> employing a balun either at the input or output. It may provide reasonable
> balance on the lower bands, but as you move up past 10mHz, the currents on
> both feeder wires become progressively unbalanced, leading to RFI problems
> such as K3EY experienced.
> In my experience an inherently balanced, link-coupled network like the
> venerable Johnson Matchbox has proved to be the answer, assuming that the
> antenna flat top was in the clear away from large objects and the tuned
> feeders were brought away from it at something approximating a right angle
> for a considerable distance.
> I recently sold my KW Matchbox and learned of a ham in the Pacific
> Northwest who, for fun, hand builds balanced matching networks using
> essentially the Annecke design, with variable link etc. He builds both an
> 800 watt version and high power models and can include rf ammeters or SWR
> bridge integrated into the box if so desired by the customer. His prices
> are very reasonble and the quality of workmanship is superb. His call is
> W7RQT, Pat, a retired engineer, and you might look him up and email him to
> ascertain if is still building his wonderful balanced matching networks.
>
> Vince K7NA
>
>
>
> Date: Sat, 9 Jul 2005 09:58:23 -0700
> From: "denton" <denton@oregontrail.net>
> Subject: Re: [TenTec] "Radiates like Crazy"???? No
> To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
> Message-ID: <004d01c584a7$6b48b8a0$0200a8c0@VIVSDENTON>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> I have also switched back and forth from running Johnson Matchboxes to ant
> tuners with baluns to feed ladderline, and can votch for the below.
> Currently running a pair of those old Matchboxes to feed vertical and
> horizontal dipoles with good results.
> Is any European manufactures now building true link coupled balanced line
> transmatches?
> Would dearly love to secure an Annecke on this side of the pond...
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>
>
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