It's a Nye Viking Antenna Match Box...sorry for the confusion.
----- Original Message -----
From: "Rick - NJ0IP / DJ0IP" <Rick@DJ0IP.de>
To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
Sent: Monday, February 14, 2011 8:39 AM
Subject: Re: [TenTec] Antenna follow up- asked for help in January-need more
help.....
Gerry, he said it was a MFJ-974, which I also own, and am very familiar
with.
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of Dr. Gerald N. Johnson
Sent: Monday, February 14, 2011 11:07 AM
To: Rick - NJ0IP / DJ0IP
Cc: 'Discussion of Ten-Tec Equipment'
Subject: Re: [TenTec] Antenna follow up- asked for help in January- need
more help.....
How do you KNOW "that matchbox" has no coil to tap? If its a Viking
Matchbox its a link coupled with an input coil. He didn't say what kind
of match box.
73, Jerry, K0CQ
On 2/14/2011 5:44 AM, Rick - NJ0IP / DJ0IP wrote:
There is no input coil on that matchbox.
It uses a symmetrical "T-Filter" and has an input capacitor.
Besides, it is not as good to try to compensate for the high impedance
inside the matchbox, as it is to change the impedance of the antenna
system
by a simple adjustment of the feedline length (1/8 wavelength
{electrical}
longer).
73
Rick
-----Original Message-----
From: tentec-bounces@contesting.com
[mailto:tentec-bounces@contesting.com]
On Behalf Of Denton
Sent: Sunday, February 13, 2011 10:35 PM
To: geraldj@weather.net; Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Antenna follow up- asked for help in January- need
more help.....
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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