[TenTec] Orion Jupiter mic connections

[Robert & Linda McGraw K4TAX]

If one is gonna do this then I want an AES/EBU input.  That way I can forget
all the other crap and be pure digital.

Unbalanced, if done correctly, WORKS.  If it doesn't work, it's not correct!
No isolation is required.  I've dealt with unbalanced INs and OUTs and
balanced INs and OUTs in a professional environment for more years than most
have been hams.

Isolation transformers are a true invitation for hum being induced.  What
was experienced in this situation is a simple case of "ground loops".

73
Bob, K4TAX


----- Original Message ----- 
From: "Rob Atkinson K5UJ" <k5uj at hotmail.com>
To: <tentec at contesting.com>
Cc: <k5uj at hotmail.com>
Sent: Monday, April 19, 2004 11:40 AM
Subject: [TenTec] Orion Jupiter mic connections


> >The microphone connections on both rigs are unbalanced ( mic + and -
> Grnd).
> >Now there is nothing wrong with this setup mfrs. have been doing this
> forever.
> That's exactly the problem.
> It would be great if manufacturers built rigs with balanced XLR audio
inputs
> and isolation transformers, and a separate PTT jack.  A lot of "RF in the
> audio" problems would vanish.  Balanced audio lines are much less
> susceptable to hum and RF pickup.  All decent baseband audio gear is
> designed to operate with balanced lines; professional audio and broadcast
> equipment are designed for them, for the aforementioned reasons.  But ham
> radio manufacturers seem to have stalled on the idea that everyone
operates
> voice with a PTT hand mic, and coiled cord right into the rig, as if
nothing
> has changed in the past 15 years or so.
>
> Rob Atkinson
> K5UJ
>
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