>
>Looks like the RCD resistors will do the trick (the 20W parts should fit
>nicely in the space available inside the L-7 PS). ... ... ....
>
Their 5Watter (140 watt-seconds/joules) will do an L-7 with ease since
stored energy is c. 80-joules. If you get a price, please post it.
cheers, Mike.
>----- 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
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
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>Problems: owner-amps@contesting.com
>
>
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
end
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