Power supply problem?

[Richard Post]

Larry,

I assume you've checked your grounds?  If the "ground" return is 
through 12 volts of AC, that would explain the hum/ distortion 
symptoms.

I usually hook an external chassis-to-chassis ground on power supply 
to transceiver, primarily for safety's sake.  Don't like the thought 
of a small ground wire in an old cable being the only thing between 
me and 800+ volts between the two chassis. Don't want to become the 
return "ground" connection.

Use a voltmeter to see if you have any potential between the two 
chassis, especially 12 VAC or something more serious.

Are any of the three supplies equipped with a safety (grounded third 
prong) power cord?  Are you getting a ground loop between that third 
prong and your antenna coax?

Let us know what you find.

73 es gd hunting,

Rich

Boatanchor pix

<http://www.qsl.net/kb8tad>

At 6:29 AM -0600 1/5/05, lgrindel wrote:
>Good morning guys,
>  Having an odd problem. I have 3 HP-23 power supplies. All three
>work great with my HW-101. No problem. However, only one of them
>will work with my SB-102. The other 2 produce only a very
>distorted audio, and a fairly loud hum. I am using the same cable,
>and all the voltages are set at 300. I have checked bias voltage,
>and looked for any grounding problems, but since the SB-102 does
>work with 1 supply, it has really got me baffled. Any ideas would
>be greatly appreciated. Thanks in advance & 73
>Larry
>KD5ECG
>
>________________________________________________________________

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