[Boatanchors] Microphone Output

[Richard Knoppow]

----- Original Message ----- 
From: "David C. Hallam" <dhallam at knology.net>
To: "D C _Mac_ Macdonald" <k2gkk at hotmail.com>
Cc: <mwtallent at comcast.net>; <boatanchors at mailman.qth.net>
Sent: Friday, January 11, 2013 9:04 AM
Subject: Re: [Boatanchors] Microphone Output


> The microphone in question is a high impedance Turner 95D 
> AKA Collins SM-1.  I just looked through an old Turner 
> catalog and found a reference to only one microphone where 
> output was stated a reference to 1 volt/dyne/cm^2.  All 
> others were just given so many - db.  So I suppose that is 
> it for Turner microphones.
>
> David
> KW4DH
>
    This is a standard reference for all high impedance 
microphones. There were two systems in common use from about 
1960, one was the power reference and the other was the EIA 
sensitivity rating which was based on a lower acoustic 
driving force and is considerably lower.  I no longer 
remember the acoustic reference but think it may have been 1 
dyne/CM^2. Low impedance microphones are rated in dbu for 
any impedance and high impedance microphones in db with 
reference to 1 volt.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com