Date: Wed, 27 Oct 2010 07:26:01 -0500
From: Rob Atkinson <ranchorobbo@gmail.com>
Subject: Re: [Amps] construct ferrite "line isolator"
To: amps@contesting.com
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<AANLkTi==1ous93XBoQBOfkf5LzQAv=WnDR571psvoeyB@mail.gmail.com>
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>The next AES Convention will be held in San Francisco
>next weekend. If you have time, we can walk the show floor together and
>I can show you some Pin 1 Problems. :)
Jim, what method do you employ to find the Pin 1 problem on a piece
of equipment out on a trade show floor? I assume it must be a fairly
simple check I can employ in my ham shack. tnx
73
Rob
K5UJ
## that's easy. Bring along ur ohm meter. It should read zero ohms between
pin 1
and chassis. If it doesn't... you have the dreaded pin 1 problem...or just
look at the
schematic.
## IOW, they used 'electronic grnd'....'return grnd' and they come under a
variety
of names. The standard these days in the pro audio world, is to use the
actual chassis as the real grnd.
## along comes yaesu, icom et all... and what u think is grnded to the
chasssis..isn't ! When u see
the mating female on the rear panel do a 90 deg right angle inside..and
terminate on a pc board....
the shell is usually not grnded to the chassis.
## In the telco world, they use abt 5-8 x different kinds of ...'grnds' !
Jim VE7RF
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