I use a horizontal loop..about 235 ft in length.
My current matchbox has an adjustable tap on the input coil. With a little
tinkering with the input tap, feedline length, feedline width, I have gotten
my matchbox to work 80 thru 10 meters, WARC bands and 60 meters (if 2.25 to
1 swr is acceptable on 60 meters)included.
Quite a bit of work....but to me it was all worth it.
----- Original Message -----
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
To: <tentec@contesting.com>
Sent: Sunday, February 13, 2011 6:00 PM
Subject: Re: [TenTec] Antenna follow up- asked for help in January- need
more help.....
> That is an effective but sometimes inconvenient way to handle an antenna
> and feedline that gets the feed Z out of the range of the tuner, a
> significant problem with the limited range of the Johnson Matchbox.
>
> 73, Jerry, K0CQ
>
> On 2/13/2011 7:49 PM, Ken Brown wrote:
>> I have a center fed dipole, fed with 450 ohm ladder line. I built it to
>> the dimensions that were convenient, without much regard to how the
>> dimensions relate to a wavelength on any particular band. On the bands
>> that my Johnson KW Matchbox can tune it, with the shortest length of
>> ladder line from the feed through the wall to the Matchbox, I operate it
>> that way. On the bands that it cannot tune it that way, I add lengths of
>> ladder line, until I find a length that allows the Matchbox to tune it.
>>
>> Not quite as convenient as if only changes in the tuner knobs were
>> needed to change bands. It works though.
>>
>> DE N6KB
>>
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