[TenTec] Station power supply??

[Don Allen]

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 at audiosystemsgroup.com>
> Cc: "Discussion of Ten-Tec Equipment" <tentec at 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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