[Amps] Redundant ground connections with coaxial HV line

[Carl Clawson]

Someone posted a link from GM3SEK the other day which I'll repeat here:
http://www.ifwtech.co.uk/g3sek/in-prac/hvpsu.pps

(I couldn't read it in my browser for some reason; had to download and open
it in PowerPoint. If you don't have PowerPoint, go get Open Office for free
and it'll display it just fine.)

Look at the control circuit for the P.S. about 10 slides in. Ground is
conveyed by the shield of the coaxial HV line and separately by the control
connector that also carries the B- return. If the control connector is
plugged in, you have a redundant ground. If it's not plugged in then the HV
can't be on.

I would love to have heard the presentation that went along with these
slides.

73, Carl WS7L

PS thanks for all the comments about HV coax, everyone!

> -----Original Message-----
> From: amps-bounces at contesting.com 
> [mailto:amps-bounces at contesting.com] On Behalf Of Bill, W6WRT
> Sent: Sunday, September 12, 2010 2:33 AM
> To: amps at contesting.com
> Subject: Re: [Amps] Amps Digest, Vol 93, Issue 16
> 
> 
> However, I stand by my recomendation to have a separate, 
> solid ground connection between the amp and PS chassis, 
> entirely indepencent of the HV conector. This gound wire 
> should be connected at both ends with a nut and bolt or 
> screw, not a slip-on connector. It should be the first wire 
> connected and the last wire removed when working on the units.
> This will help reduce shock hazard from an AC line fault as 
> well as HV issues. 
> 
>