Interesting Problem

[WB2TBB]

How well do you have your shack/gear/outlets grounded?
Thats what it sounds like to me.
...Dave
-----Original Message-----
From: MooWare <mooware at SPRYNET.COM>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Wednesday, July 07, 1999 6:11 AM
Subject: Interesting Problem


>Greenies,
>
>I have an interesting problem here, perhaps someone can lead me to what
they
>think might be wrong.
>
>I have an HW101, HS 1661 speaker and  the HP23a power supply.
>
>With everything turned off.  If you place your ear next to the speaker you
>can hear a very low hum. If I unplug the speaker from the HW101 the hum
goes
>away, BUT.  If I touch any part of the metal chassis or any other piece of
>station equipment with the center pin of the rca jack, the hum is very
>audible.
>
>When I turn the 101 on.  I get a very audible hum for less than 1 second.
>then drops to the very very low level. so low in fact you would not notice
>it if you didn't have your ear next to the speaker.
>
>I turn the radio off, I unplugged the power cable from the 101 to the Power
>Supply, and unplugged the power suply from the wall.  and guess what?  The
>low hum is still there!
>
>any ideas?
>
>Sean
>
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>
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