[TenTec] Orion and MIKEs

[Grant Youngman]

> 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