Hi Doug,
Clem, W1EVT, was a Ph.D. student of the famous physics professor at Harvard
University for 60 years, Ronold W.P. King.
http://en.wikipedia.org/wiki/Ronold_W._P._King
Clem received his Ph.D in 1952, his thesis title was "The Coupled Receiving
Antenna"
73
Frank
W3LPL
---- Original message ----
>Date: Sat, 6 Jun 2009 00:50:42 +0000
>From: Doug Grant <dougk1dg@gmail.com>
>Subject: Re: [TowerTalk] Power Pole
>To: towertalk@contesting.com
>
>> From: Andy <ai.egrps@gmail.com>
>
>> The one near me is W1EVT.
>>
>> Someone mentioned on an email list that they haven't heard from W1EVT yet
>> this year. I don't know anything about him or his station other than the
>> few mostly anecdotal stories I've read. His antenna may or may not have
>> been a Sterba curtain, the government may or may not have had an
>> interest in it, his feedline is claimed to be thousands of feet of open wire
>> that runs underneath the street, and his callsign might have changed over
>> the years.
>
>I can fill in some of the blanks.
>
>W1EVT's antenna system consists of stacked dipoles for each band on a
>total of 18 towers (there is a 19th, but I don't think it has anything
>on it. I seem to recall he had a small beam on it once for testing.
>About once every two years the local Boston newspaper answers a
>reader's question about his antenna system ("Is that some kind of
>top-secret military installation next to Route 2?").
>
>The 18 towers are all about 120 or 140 feet tall, all Rohn 25. The
>towers for each band are arranged in equilateral triangles, and hold
>stacks of dipoles, fed with binomially-weighted currents. For example,
>on a band with 3 stacked dipoles, the top and bottom dipoles are fed
>with I, and the middle is fed with 2 x I. I think some bands had 4
>(fed 1:2:2:1), and maybe 10M had 5 (fed 1:2:3:2:1).
>
>Having 3 sets of these stacked dipoles, each with about 60 degrees of
>(bidirectional) pattern, affords full azimuth coverage with fast
>switching. I suspect the story about his antenna system being used for
>covert military DFing is an urban legend, since fixed-position dipoles
>are probably not the best antennas for that purpose.
>
>Yes, the main feeders are open-wire run in a conduit under the street,
>since the antennas are in a pine forest across the street from Clem's
>house. Clem has/had an extensive TDR setup for troubleshooting faults,
>since branches fell on the feeders out in the woods frequently. He
>could figure out where the fault was with his TDR, then walk to the
>exact spot and fix it.
>
>As I recall from my visit there, he had a homebrew transmitter but
>some state-of-the-art commercial (non-ham) receiver. He may have moved
>to commercial ham gear now.
>
>Clem held the callsigns KF1Z and NY1N between his two periods of
>holding W1EVT. I saw him last spring at the MIT flea market, but have
>not heard him on the air much. Best time to listen has always been
>around sunset in the winter, working JAs long-path on 80M.
>
>He holds a Ph.D. in Physics from Harvard, and his dissertation was on
>"Coupled Receiving Antennas". When I visited him, he was running a
>small company in his basement manufacturing very high-voltage
>transformers, using epoxy potting of his own formulation and an
>ingenious home-brew vacuum pump to evacuate voids in the potting.
>
>73,
>
>Doug K1DG
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