[BC] RF interference problem

[Mike McCarthy]

Conversely, a well known engineer in this market has a continuity tester on 
the station audio common and tests every piece of equipment for a bond 
ground to Pin 1 in each piece of equipment.  If it's in place, he either 
eliminate the connection so there no ground loop or he somehow isolates the 
audio common from chassis.  He too has a white paper on that subject.

MM

At 08:50 PM 1/22/2006 -0500, RLO2L at aol.com wrote
>
>In a message dated 1/22/2006 7:39:37 P.M. Central Standard Time,
>Towers at mre.com writes:
>
>I don't  recall Jim ever having suggested bonding pin 1 to chassis of each
>piece of  equipment in all conditions.
>
>
>I guess I did not mean to infer that this is to be done in ALL conditions,
>but it is a good place to begin. We have been using the "hummer test," 
>which I
>do by placing my TOA ZM104
>Impedance meter between pin 1 and the chassis.
>
>The impedance meter generates a 1 kHz. signal at low levels, If the tone
>comes through
>the piece of gear, then there is a Pin 1 issue!
>
>Jim has a white paper, "Solving and Avoiding Problems Without Opening the
>Hood!"
>
>It may be on his web site _http://audiosystemsgroup.com_
>(http://audiosystemsgroup.com)
>
>There was a wonderful workshop sponsored by Syn-Aud-Con in Chicago last
>July, 05
>(Hums, Buzzes, and RF Workshop), with Jim and Bill Whitlock making some  very
>good presentations.
>
>Bill Whitlock is of Jensen Transformers and they have some excellent
>documents and tools for tracing and troubleshooting hum and noise problems 
>in  audio
>gear! Well worth having a look see if you are having problems.
>
>Russel L.  O'Toole, P.C.
>R&M Consulting
>
>
>31 Ponderosa  Drive
>Romeoville, Illinois 60446
>815-372-1990 voice
>630-699-2965  cell
>815-886-9232 fax
>KD5OAE  General
>
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