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Re: Topband: Need assistance with 160m Marconi

Subject: Re: Topband: Need assistance with 160m Marconi
From: Pete Smith <>
Date: Sat, 19 Sep 2009 17:04:43 -0400
List-post: <">>
That smells like a shorted connector and a long feedline to me.

73, Pete N4ZR
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On 9/19/2009 11:55 AM, Craig D. Smith wrote:
> Hi Paul ...
> Is the 0 + j122 a typo?  The j122 is quite plausible, but not the 0.  I
> would expect the real part to be somewhere between 10 and 40 ohms, depending
> upon your ground condition and radial system.  I'm not at all familiar with
> the Palstar analyzer, but 0 isn't an acceptable result.  Your first priority
> should be to understand/correct this reading.  You might try some low value
> resistors and see what you measure, or look for some type of misconnection
> in your setup.
> The +j122 simply means that your antenna (top wires) are somewhat too long.
> Not unusual with the first cut at a new antenna.  You would correct this by
> shortening the ends of the top wires by an equal amount until you get
> resonance at the desired frequency.  This is priority #2.
> Priority #3 would be to build a UNUN to optimize the match at the base.  But
> you will need to do #1 and #2 first.
>         73   Craig   AC0DS
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