RE: rf ground....

To: tesla-at-poodle.pupman-dot-com
Subject: RE: rf ground....
From: Benson_Barry%PAX5-at-mr.nawcad.navy.mil
Date: Sat, 05 Oct 1996 09:19:00 -0400 (EDT)

Tesla did experiments down to 24khz in some of his researches.  What kind of
a spark length can they get off of this thing at full tilt (air streamer of 
course).
Barry

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|From: "tesla-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|To: Benson Barry; "Tesla-list-subscribers-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|Subject: rf ground....
|Date: Friday, September 27, 1996 3:28AM
|
|<<File Attachment: 00000000.TXT>>
|From pierson-at-msd26.enet.dec-dot-comTue Sep 24 22:27:37 1996
|Date: Tue, 24 Sep 96 12:30:17 EDT
|From: pierson-at-msd26.enet.dec-dot-com
|To: mail11:  ;
|Cc: pierson-at-msd26.enet.dec-dot-com
|Subject: rf ground....
|
|
|(No.  I STILL haven't found that test process....)
|
|>The ideal counterpoise would be boring and threading a 1" diameter hole
|>in the deck of the battleship Missouri while at anchor in a nice salt
|>water port.  I don't think there would be a detectable difference even in
|>dry dock.
|
|    Not Particularly Close.  8)>>
|
|    Typical AM Transmitter grounding practice is a 1/4 wave radial
|    (thats the length) every 5 degrees or so in a complete circle.
|    Figger the 1/4 wave length for the operating frequency of the coil in
|    question.....
|
|    There is (was?) a transmitter in Florida (Not radio Marti, years 
before)
|    with the tower on the end of a pier and the counterpoise/ground was
|    the Atlantic Ocean.  Not Real Practical for the average coiler.
|
|    (Hmmmm.  I wonder if there is a surplus, disused, island lighthouse
|    available.)
|
|On a more serious note, i don't think the FCC specifies ground goodness, 
per
|se.
|They DO specify (or accept) specified coverage patterns, be they circular 
or
|'directional'.  Predictability of THOSE requires a good (see above) RF
|Ground...
|
|I once took an IEEE sponsored tour of the USN VLF transmitters, in Cutler,
|Maine.  (can post longer description, but its not_tesla).  They can put out 
up
|to about 2 MW _continuous_ at 24 KHz.  The ground system is described as
|'chicken wire over the whole area (square mile or so) with the ends dipped
|into
|the sea...
|
|    regards
|    dwp
|