The insulation on the MHV plug extends beyond the bayonet mount making
it extremely difficult, if not impossible to mate with a BNC.
I used them extensively at voltages above 5 KV when I was at MIT.
Of course, I usually did the mating and unmating process with the HV OFF !!
But then, I do things in strange ways. Mating and unmating HV connections
with the HV on is plain stupid and qualifies the person for the Darwin Award.
73, Dick, W1KSZ
> Date: Wed, 13 Jan 2010 07:40:39 +0000
> To: amps@contesting.com
> From: gm3sek@ifwtech.co.uk
> Subject: Re: [Amps] which HV connector to use?
>
> Paul Christensen wrote:
> >>
> >> You can use the MHV type coax connector. Looks like a BNC on steroids.
> >> I used them to power an IR Image Converter that required 8 kVDC many
> >> moons ago.
> >>
> >> 73, Dick, W1KSZ
>
> MHV are a dangerously bad design - a BNC plug can quite easily be mated
> with an MHV socket.
>
> The single-pole Millen connectors are also dangerous because there's
> nothing to prevent a user from connecting only the B+, with no B-minus
> or ground return. With a separate RF chassis, switching on will give you
> a live chassis.
>
> In both situations, something else usually prevents a fatal accident
> (the technical term for this is "dumb luck")... but still, there is
> something fundamentally wrong about any HV connector series that
> actually *adds* to the risk.
>
>
> >Or in the alternative, an SHV connector as an improved type of HV
> >disconnect over the MHV for added safety. With the SHV, the HV contact
> >breaks path before the grounded shell contact path..
> >
> >Paul, W9AC
>
> Yes! With SHV, they finally got it right. As Paul says, they provide a
> guaranteed ground return. Also, both connectors have deeply recessed
> center pins, they cannot be mated with anything else and they use
> standard RG58 cable.
>
> New SHV connectors are very expensive, but they often appear surplus and
> on eBay... precisely *because* they won't mate with anything else.
>
>
>
> --
>
> 73 from Ian GM3SEK
> http://www.ifwtech.co.uk/g3sek
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