[ARC5] zero

[WA5CAB at cs.com]

AN/TRC-20 had the same purpose.  Built mostly from SCR-609 or 610 
components.

In a message dated 08/19/2012 16:53:59 PM Central Daylight Time, 
jfor at quikus.com writes: 
> 
> There was a special WS 19 Mod for the artilary spotting function. It used
> audio subcarriers and a secial recorder for comparing times of arrival.
> 
> -J
> 
> ====================
> >
> >----- Original Message -----
> >From: "J. Forster" <jfor at quikus.com>
> >To: <provero at ct.metrocast.net>
> >Cc: "Richard Knoppow" <1oldlens1 at ix.netcom.com>; "Bruce
> >Long" <coolbrucelong at yahoo.com>; <kgordon2006 at frontier.com>;
> ><arc5 at mailman.qth.net>
> >Sent: Friday, August 17, 2012 4:40 PM
> >Subject: Re: [ARC5] zero
> >
> >
> >>I've seen pics of a Japaneese sound detection machine like
> >>an array of
> >>tubas on a truck body.
> >>
> >>Best,
> >>
> >>-John
> >>
> >     A correction.  I said the hot-wire microphone was the
> >same as a thermophone. My error, its not.  The thermophone
> >is a _source_ of sound using a wire or ribbon which is
> >heated.  Thermophones are used for producing a known sound
> >pressure for calibrating measurement microphones.  There is
> >a brief summary of an article describing it at:
> >http://prola.aps.org/abstract/PR/v19/i4/p333_1
> >     There may also be a paper in the _Bell System Technical
> >Journal_ which is available free on line, do a google search
> >for it.
> >
> >
> >--
> >Richard Knoppow
> >Los Angeles
> >WB6KBL
> >dickburk at ix.netcom.com
> >
> >
> 

Robert & Susan Downs - Houston
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