[TowerTalk] How close does a vertical have to be to

[jeremy-ca]

If you look at the coastal transmitting sites of those days you will see 
that many were located at the edge of a salt marsh. Their primary listening 
audience was in the direction of the marsh and/or open water. They generally 
did not locate with their biggest audience inland. WOR in NYC for instance 
had the antenna in the marshes of NJ. I could hear them in the Eastern 
Mediterranean in the early 60's. On some nights they cleared a complete path 
through the tortured cat screeches that passes for music in that part of the 
world.

Back then most were single tower installations. Multi tower installs were 
primarily for bi directional gain. The real fights for frequencies and 
steered nulls didnt really take off until after WW2.
As I type this listening to the Red Sox game on 680 WRKO they just hit the 
sundown button on their array. A good 25dB drop and the hetrodynes popped 
in.

With a shallow salt water table directly below the antenna there will be a 
benefit  compared to none. However on HF you can expect a VSWR change with 
the tide; the amount will be dependent upon the ground system used.

Carl
KM1H

----- Original Message ----- 
From: <K7LXC at aol.com>
To: <towertalk at contesting.com>; <n5ot at n5ot.com>
Sent: Friday, July 27, 2007 5:58 PM
Subject: Re: [TowerTalk] How close does a vertical have to be to


>
> Some years ago I saw a study done by Bell Labs or  RCA or similar in the
> 1930's or so in a broadcast engineering handbook that  showed some help 
> even a
> mile or so away depending on the frequency. I wish I  could remember the
> specifics - sorry. If anyone can help with some specifics,  I'd appreciate 
> it.
>
> Cheers,
> Steve    K7LXC
> TOWER TECH
>
>
>
>
>
>
>
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