[amsat-bb] Re: Linear vs. switching and HV DC

Vince Fiscus, KB7ADL vlfiscus at mcn.net
Fri Feb 18 13:26:22 PST 2011

At 12:01 PM 2/18/2011 -0900, "Edward R. Cole" <kl7uw at acsalaska.net> wrote:
>I am rebuilding my 4.2kV PS for the 2m-8877.

That'll get you into AO-51.  ;-)

>I was 14 years old when working on my DX-35 with 850vdc on the 6146 plate.
>I agree that many hams these days aren't not trained to handle
>high-voltage with all the 12vdc solid-state electronics
>available.  But QRO sspa are running at 50vdc and higher.  There are
>rules for safe work on HV...time to review them.

I know that's true.  Even the large caps in high current 13v supplies. I 
thought I had things discharged and just to be sure before I started poking 
around with a screwdriver checking other things, I thought I would be sure 
the filter caps discharged, so I put the screwdriver across the 
terminals  .....

You should have seen the spark.


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