[RFI] Across-the-bay line noise from 17 miles away

[donovanf at starpower.net]

Rick is precisely correct.

When HF communications was in its heyday, the U.S. Navy NSS transmitter facility (Annapolis MD) was on the 230 acre Greenbury Point peninsula, nearly completely surrounded by the Cheaspeake Bay.

http://wikimapia.org/1646679/Naval-Radio-Transmitting-Facility-Annapolis-NSS  

On the other hand, the NSS HF receiver station was high in the mountains of Sugar Grove, WV in what is now the National Radio Quiet Zone. The receiving antenna was a massive pair of AN/FRD-10 Wullenwebber circularly disposed antenna arrays (CDAAs) that replaced the much noiser former receiver site in Cheltenham, MD in 1969.

http://wikimapia.org/#lat=38.5146949&lon=-79.2784166&z=13&l=0&m=b&search=38.5146949n%2C%2079.2784166w

73
Frank
W3LPL


---- Original message ----
>Date: Tue, 01 Feb 2011 09:28:15 -0800
>From: "Richard (Rick) Karlquist" <richard at karlquist.com>  
>Subject: Re: [RFI] Across-the-bay line noise from 17 miles away  
>To: doc at kd4e.com
>Cc: RFI at contesting.com
>
>The problem here is the salt water path.
>I have found from driving around that power line
>noise travels a long way when over high conductivity
>ground, so that even getting miles away from the
>nearest power line is no guarantee of a noise
>free area.  OTOH, up in the mountains, where
>conductivity is poor, about 1/2 mile away
>from the nearest power line is quiet as a
>church mouse.  The ideal station has a transmitting
>antenna over salt water and a remote receiving
>antenna on a mountain top.
>
>Rick N6RK
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