[TenTec] Heil ProSet adapter with Orion -- hum

[George Skoubis]

Bob,

  Is the audio ground only present when using a balanced mike? With an
XLR connector?

  On a Heil headset I can only envision +, -, and shield.

  I'm not trying to be a smart alec with this question, just wondering
where the audio ground is found on a headset.

Thanks,

George / KF9YR

-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com] On Behalf Of Robert & Linda
McGraw K4TAX
Sent: Wednesday, June 23, 2004 10:55 PM
To: tentec at contesting.com
Subject: Re: [TenTec] Heil ProSet adapter with Orion -- hum

I shouldn't bring this up again for someone will blame it on the "Pin 1
problem".  The fact is there's typically 4 connections for microphone
audio.
There is the Audio Hi or +,  Audio Lo or -, Audio Ground, and Audio
Shield.
That's 4!  The big problem lies in the misunderstanding that Audio Lo,
Audio
Ground, and Audio Shield can be the same or connected together.  They
can't
and shouldn't.  Shield is shield and ground is ground.  They aren't the
same
as ground may be a current carrying conductor and shield should not be a
current carrying conductor.

In all of my mike lines there are 3 conductors which are surrounded by
one
shield.  None of these are used for DC or PTT. They are all for proper
audio
connections.

73
Bob, K4TAX



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