Hello,
Unfortunately, I've had a failed blocking cap. and the choke on the output
did save a bunch of ant. switching relays and other parts. The choke did
work as Bill, W6WRT, said it should. The choke was readily easily replaced
and a lot cheaper than the number of relays in the ant. system that would
have been compromised should the amp's HV got to them.
On Sat, Aug 22, 2009 at 2:26 AM, Ian White GM3SEK <gm3sek@ifwtech.co.uk>wrote:
> Bill, W6WRT wrote:
> >ORIGINAL MESSAGE:
> >
> >On Fri, 21 Aug 2009 15:36:13 -0700, "Jim W7RY" <w7ry@arrl.net> wrote:
> >
> >>Why not just put a choke or 100K resistor on the output of the tank?
> >
> >REPLY:
> >
> >A resistor in place of the choke is not a good idea. If the blocking
> >cap shorts,
> >the resistor will almost certainly blow open and you are right where
> >you were if
> >there was nothing there at all.
>
> Agreed - a resistor provides no protection against failure of the HVDC
> blocking capacitor.
>
> >A choke will almost certainly blow the AC fuse
> >and/or the glitch resistor and remove B+ from the output connector.
> >
> >It goes without saying - or should - that the choke has to be mode of
> husky
> >enough wire to do the job without opening.
>
> That's certainly the idea... but how many of us have ever confirmed that
> our "safety" chokes could really do that?
>
>
> --
>
> 73 from Ian GM3SEK
> http://www.ifwtech.co.uk/g3sek
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>
--
73,
Mike, K4GMH
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