[Boatanchors] Microphone

[rbethman]

First test of ANY microphone is place O'scope across the mic element.

The normal background noise - a fan, TV, wife, etc., will first let me 
know if the element is alive or not to bother.

Have a "Old Matthew Broderick" Highway Patrol mic, stand, and element.  
Passes all tests with never doing other than above.

If it needs DCV, I don't want it.  Only place I use one like that are my 
Dave Clark headphone/microphone for flying.  I use an intercom box with 
left and right seat on VOX, others can only listen.  I use a manual key 
with Velcro to attach to the stick or yoke.  Depends what I fly.

Bob - N0DGN

On 2/8/2013 5:35 PM, David C. Hallam wrote:
> Well, a little more information.  I connected it to an SBE-33.  What 
> happened was when I pushed the PTT switch, I got full output on the 
> SBE-33 with no audio input to the microphone.  The purpose of the 
> walwart to to simulate on the bench the voltage applied through the 
> switch contacts when it was connected to the SBE-33 while I observed 
> what was happening on the scope.
>
> I have downloaded the same file.  Looking at the switch diagram in the 
> file.  I have the microphone connected to contacts 1 & 2. Contact 1 is 
> also connected to the braid shield.  PTT wires are connected to 
> contacts 4 &5.  Contact 4 is also connected to the shield.
>
> David
> KW4DH
>