Good one.
----- Original Message -----
From: "Grant Youngman" <nq5t@comcast.net>
To: <tentec@contesting.com>
Sent: Saturday, November 15, 2003 00:07
Subject: Re: [TenTec] Orion and MIKEs
> > Have got to disagree with on this subject.Another poster noted that
> > the DC resistance from the shell of the mike jack was abt 6 OHMS and
> > asked to anyone else to try it-the DC reisistance on my Jupiter to the
> > back chassis ground point reads abt 8 ohms.No way this should occur
>
> I don't agree.
>
> Perhaps anyone who thinks it is a serious problem (serious enough to
> begin strapping ground wires in his radio) should have the discussion
> with T-T engineering. Unintended ground loops and (potentially) radiating
> or pickup wires floating around are not necessarily a good thing. They
> may do no harm, but as a reasonably experienced engineer, I have spent
> more than just a little time chasing problems that turned out to be ground
> path related issues of one kind or another, or digital switching hash
> getting into places it isn't wanted, etc.
>
> It is not uncommon to have signal grounds appear at a slightly different
> potential than case ground (which is what we're talking about) depending
> on where the two are measured. The issue is more the where and how
> the two are bonded (if they're bonded at all).
>
> If you follow T-T microphone cabling instructions bonding the shield (and
> mic housing) to the shell at the connector, the mic signal ground and the
> case ground will be at the same potential at the bond point, and the
> intended bond point is right at the connector -- not at the rear of the
radio.
> The design of the Studio One and other T-T mics meet this spec. It's a
> simple and appropriate thing to do. Maybe it doesn't matter. But if it
> does, then why not just do it that way and call it a day.
>
> Grant/NQ5T
>
>
>
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