Most likely it helps avoid ground loop hum assuming the green wire is connected to the case.
I have a computer switching power supply converted for 13.8V which does have the neg. connected to the case and the green wire and in some situations it does have 60 cycle hum. John Lock kf0m at arrl.net > -----Original Message----- > From: [email protected] > [mailto:[email protected]]on Behalf Of Leroy A. M. > Baptiste > Sent: Sunday, June 20, 2010 5:28 PM > To: [email protected] > Subject: RE: [Repeater-Builder] Astron RS50 Power Supply > > > I must have missed it, but what is the deal of not > connecting the negative side of an Astron Supply > to case? > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On > Behalf Of Mike Morris > Sent: Sunday, June 20, 2010 6:24 PM > To: [email protected] > Subject: Re: [Repeater-Builder] Astron RS50 Power > Supply > >
