[Antennas] Suggestions Please

2002年1月05日 18:53:08 -0600

Kevin- W5DXP has long advocated an adjustable ladder line segment for the
problem you have. He describes his system on:
http://www.qsl.net/w5dxp/notuner.htm
and it might help you.
GL-Bill-W4BSG
At 03:09 PM 1/5/02 -0800, you wrote:
>Hello All,
>>Well, after changing amps twice I finally have been able to narrow down the
>problem I'm having with my antenna on 160 and I would like to describe what
>is happening and seek advice from the gurus on this list.
>>Here's the setup. I am running an extended double Zepp for 40 meters which
>tunes from 160 through 10. Physically it is an inverted vee, 45 feet high
>at the apex with 90 feet of wire either side of center and fed with about 70
>feet of windowed ladder line. I am using a 4 to 1 current balun mounted
>outside the shack with about ten feet of RG-8 between it and my tuner. The
>first 60 feet on each side of center comes down from center in classic
>inverted vee style and then the last 30 feet of either leg are attached at
>the ends and dog legged off at about six feet off the ground on one end and
>perhaps a lowest point of 7 feet off the ground on the other.
>>Here's my problem. I am able to achieve resonance with my tuner on all
>bands but on 160, and on 80 at times, when I attempt to run my amplifier,
>the antenna capacitor in the tuner arcs. I am looking for changes I can
>make to the system which might eliminate this arcing. Of course, I can buy
>a big brute of a tuner but this is an expensive solution. What else would
>you suggest I might do to change things enough to cause this arcing to quit?
>I have some large coils a friend wound for me years ago to make a shortened
>160 meter dipole. What if I were to put one of these in series where the 30
>feet of wire is tacked on to each end? If I were to lengthen the feedline,
>how long would I need to make it to make a difference at 160?
>>I would sincerely appreciate answers to these questions or any other
>discussion we can generate from this topic which might help me reach a
>solution.
>>Thank you very much and 73.
>Kevin, K7RX
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>>-
Bill Aycock --- Persimmon Hill 
 Woodville, Alabama, US 35776
 (in the N.E. corner of the State)
 W4BSG -- Grid EM64vr
 [email protected]
 [email protected]