Phil and all.
Why the resistor ???
Art
KB7WW
Phil Clements wrote:
>
> Take a single strand out of a piece of small stranded hook-up
> wire, and solder it across a 2 watt resistor. The purist can
> adjust the wire size so it will melt at the desired current.
> GL!
> (((73)))
> Phil, K5PC
> Subject: [AMPS] HV Fusing / Diode Protection
>
> >
> >
> > In the L4-B power supply, Drake used an IRC type BWH/SPH "fail-safe"
> > resistor (0.82 ohms/2W) as a fuse to protect the diode strings in the event
> > of
> > a short or closure of the RF deck cabinet interlock.
> >
> > The resistor is still a current IRC product (as a type SPH device), but is
> > not a
> > high demand item, and is out of stock at every IRC distributor I have
> > checked
> > (including Drake). So while it is "available" it is essentially
> > Unobtainium.
> > Newark wants a minimum order of 250 each to even go ask IRC for a
> > production run. At $0.44 each, that makes a pretty expensive price for
> > ONE ;-)
> >
> > So the question. Is there some generally accepted alternate method for
> > protecting HV diode strings? A wire fusible link, perhaps? Or is this even
> > considered necessary? Would just leaving the part out create an
> > unacceptable fire hazard? etc.
> >
> > Grant
> >
> >
> >
> > ----------------------------
> > Grant Youngman -- NQ5T
> > nq5t@home.com
> > http://www.globeking.com
> > Double Oak, TX (near Dallas)
> >
> > --
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> > Problems: owner-amps@contesting.com
> >
> >
>
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