[Cliffdwellers] limited space antenna

[Alan Adelman]

--- On Mon, 3/2/09, Alan Adelman <aadelma at yahoo.com> wrote:
From: Alan Adelman <aadelma at yahoo.com>
Subject: Re: [Cliffdwellers] limited space antenna
To: "Hart" <hartva3kis at gmail.com>
Date: Monday, March 2, 2009, 11:56 AM

Hart --

I operated from an apartment in San Francisco for 10 years and my biggest problem was local qrn.  I tried all kinds of things but by far the most effective solution was to use a separate coaxial receiving loop antenna.  With this I could null S9 noise down to S2.  I used a separate indoor zepp for transmission and you could continue to use your vertical for transmission.

The receiving loop is only effective when the noise is emanating from a single direction.  If there are multiple noise sources, you can't null them all out, but at least you could get the biggest offender.  If you google "coax receiving loop", you will find plans for construction.

Hope this helps -- Alan, WB2ERJ


--- On Sun, 3/1/09, Hart <hartva3kis at gmail.com> wrote:
From: Hart <hartva3kis at gmail.com>
Subject: Re: [Cliffdwellers] limited space antenna
To: cliffdwellers at mailman.qth.net
Date: Sunday, March 1, 2009, 11:51 AM

I live in an apartment in a house on the third floor. Were I currently have
a butternut vertical mounted on the roof. The houses are in my area are
known as "row houses" because they are so close together. And the
back yard
is smaller in length of a mid size car. At the back of the house I have a
fire escape, which I use to enter my apartment. I have a balcony that is
built on the roof of the house which is about 10' by 15' which I enter
my
apartment through.  I'm not happy with my current vertical antenna and  I
wish that there was a way to design a low key but affective wire antenna for
all of the HF bands [80 - 15M].  The reason for my wanting a wire antenna is
that this vertical is
 very noisy especially when there is a subway line
running under the house.  I currently have a ft-2000 with a mfj-989d roller
inductor tuner. So tuning the antenna will not be a problem.  So...  I
thought by sending a note on this reflector that there would be someone out
there in ham land who could help me design a wire antenna for my current
situation.

73's
Hart Va3kis 

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