[Milsurplus] SIMPLE Carbon Microphone Substitute.

[Dave Jackson]

Dave:

Have you considered using a microphone from a Motorola 2-way radio?
Originally they were carbon mics (the old round, cast microphone)in the 30s
- 60s.  Motorola converted in the 60's to a dynamic mic element with a
preamp inside.  It was interchangeable with the carbon mics.

Not an ideal configuration but maybe a way to start.

Dave J. WA4OBJ

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of
David Stinson
Sent: Saturday, May 28, 2016 10:48 AM
To: COURYHOUSE at aol.com; kgordon2006 at frontier.com
Cc: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] SIMPLE Carbon Microphone Substitute.


----- Original Message ----- 
From: <COURYHOUSE at aol.com>
Subject: Re: [Milsurplus] SIMPLE Carbon Microphone Substitute.


> ah... what about a carbon microphone element  from an  old 
> telephone
> handset?

Too lo-Z for the BC-669.  I've looked at lots of Carbon mike
elements and they come in various impedances.
The series resistance of the best T-17 I have is over
20K Ohms.  Telephone mics are usually around 500 ohms.
Some are as low as 200.   That works OK with some rigs,
like the "ARC-5" sets,. but not well with the 669 or TCS.

73 Dave S.

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