[TenTec] Antenna follow up- asked for help in January-need more help.....

[Denton]

It's a Nye Viking Antenna Match Box...sorry for the confusion.
----- Original Message ----- 
From: "Rick - NJ0IP / DJ0IP" <Rick at DJ0IP.de>
To: "'Discussion of Ten-Tec Equipment'" <tentec at 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 at contesting.com [mailto:tentec-bounces at 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 at contesting.com 
>> [mailto:tentec-bounces at contesting.com]
>> On Behalf Of Denton
>> Sent: Sunday, February 13, 2011 10:35 PM
>> To: geraldj at 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 at weather.net>
>> To:<tentec at 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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>>> TenTec at contesting.com
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>>>
>>
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>>
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