Looks like the RCD resistors will do the trick (the 20W parts should fit
nicely in the space available inside the L-7 PS). Thanks to Tom, Rich, Todd,
Ian, Phil et al for the quick education on glitch circuit design.
73 de Mike, W4EF................
----- Original Message -----
From: "Tom Rauch" <w8ji@akorn.net>
To: <amps@contesting.com>; "Mike" <W4EF@dellroy.com>
Sent: Saturday, September 08, 2001 12:35 PM
Subject: Re: [AMPS] SB-1000 mods?
> > glitch resistor? I have some 25 ohm/25 watt Dale RER type metal body
> > resistors, but I am concerned that they might be prone to flash over
> > due to the relatively small gap between the leads and the metal case.
> > Presumeably a ceramic body wire wound resistor is the way to go.
> > Should I be concerned about inductance (L*di/dt kick) - some
> > wirewounds seem to be classified as "non-inductive" whereas some
> > aren't?
>
> The resistor must be surge rated for the voltage across the resistor
> and the peak energy.
>
> RCD makes xxx-P series pulse rated resistors, or you can use a
> "glow-bar" type. The RCD pulse rated resistor barely costs more
> than a conventional wire wound resistor.
>
> It makes no difference at all if it is inductive, because the
> inductance will be negligible. Many non-inductive wire wound
> resistors have a lower than normal voltage rating (from lead to
> lead), because of the winding method.
>
> The metal case resistor won't work well.
>
>
>
>
>
> 73, Tom W8JI
> W8JI@contesting.com
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