[TenTec] Orion Mic Woes - Sounds like RFI but Wasn't

[Tom Wagner]

Since this didn't get answered, I'll ask again.
Is it TenTec that is not following the IEC/AES standard?

Bottom line, if I have a mic with simple coax -- one center
conductor plus shield -- to which pin is the shield to be
attached on the Orion?

73,
Tom

-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of Tom Wagner
Sent: Saturday, December 18, 2004 4:55 PM
To: tentec at contesting.com
Subject: RE: [TenTec] Orion Mic Woes - Sounds like RFI but Wasn't


Page 9 of the Orion manual shows ground as pin 2.  Page
10 of the manual shows minus (-) as pin 2. It also
shows white as pin 2.  A web search shows the
mic pinout for the Omni VI as Pin 2 is ground.
http://lists.contesting.com/archives/html/TenTec/2001-10/msg00163.html

So is it TenTec that is not following the IEC/AES
standard?

Tom - N1MM



-----Original Message-----
From: tentec-bounces at contesting.com
[mailto:tentec-bounces at contesting.com]On Behalf Of Jim Brown
Sent: Saturday, December 18, 2004 12:56 PM
To: tentec at contesting.com
Subject: RE: [TenTec] Orion Mic Woes - Sounds like RFI but Wasn't


On Sat, 18 Dec 2004 11:30:12 -0500, Tom Wagner wrote:

>The
>Orion really, really does not like pin 2 to
>be grounded. (In the Heil setup, pin 1 is the
>mic lead center conductor and pin 2 is
>the shield.) This was the cause of the
>oscillation/instability.

Apparently Heil has never heard of the IEC and AES standards for wiring of
XL
connectors used for audio. These are international standards. The lowest
numbered
pin is ALWAYS the shield. Next one or two contacts are audio.  These are not
new
standards -- they have been in existence for more than 50 years.  There were
two
different standards for whether pin 2 or pin 3 was positive polarity with
respect to
the other. That difference was resolved about 10 years ago. But pin 1 has
ALWAYS
been the shield contact, and 2 and/or 3 have always carried audio.  When
there are
control circuits, those circuits should be on the higher number contacts.

BTW -- I'm a member of the AES Standards Committee Working Group that
maintains these standards.


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