This is a discussion that has been going on for a long time with Astron
supplies, although a few other manufacturers have also been known to tie
the negative output to chassis ground. As previously noted,
repeater-builder.com sites an example with a repeater installation where
the Astron supply with the negative line strapped to ground caused 60Hz
hum on the repeater's output due to a ground loop. However, I have also
read on other sites where the negative line should be strapped to case
ground, whereas Jim, Tom, and others state firmly otherwise. Perhaps
Astron used this "fix," as an easy out for a relatively poorly designed
regulator circuit?? I'm sure the discussion will continue, as it has
lasted ever since Astron made the running production change to their
supplies.
73
Don W9CW
On 9/5/2012 6:30 AM, Mike Hyder -N4NT- wrote:
Jim, you might want to take that up directly with Astron. I speak only
from my own experience. You can argue theory but you can't argue my
experience.
73, Mike N4NT
----- Original Message ----- From: "Jim Brown"
<k9yc@audiosystemsgroup.com>
Cc: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Wednesday, September 05, 2012 01:16
Subject: Re: [TenTec] Station power supply??
On 9/4/2012 7:42 PM, Mike Hyder -N4NT- wrote:
The way I grounded the negative lead
But the NEGATIVE lead should NOT be bonded to the chassis in the
power supply. The GREEN WIRE MUST be bonded.
73, Jim K9YC
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