[ARC5] zero

[J. Forster]

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
>
>