>Rich
>on page 13.26
>"Some designers use nichrome wire for L(sub)z but there is no credible
>evidence of any fundamental difference in performance as a result."
>The same statement is in the 99 Handbook.
? John -- The same statement (by Ehrhorn) was in the '95 Handbook.
This was before Wes' tests with the Hewlett Packard Impedance Analyzer.
The test evidence showed that a resistance wire suppressor lowers VHF-Q
by a bit over 40%. This is probably a conservative number because we
currently use resistance wire that has about 70% more resistance than the
wire used in Wes' tests. However, if resistors were available that had
roughly 10nH of L, And would dissipate at least 30w, an even lower VHF-Q
suppressor could be built with copper wire. Cesiwid Co. told me they
could manufacture such resistors. The asking price for a min. order was
about 10 kilobucks.
>I don't know if that is what you were referring to but I have seen suppresser
>resistors cooked and it seem to me the the combination of the resistance and
>inductance in the nichrome wire would be a better way to go IMHO.
? True. Nichrome can safely operate at dull red heat. Carbon-comp.
resistors can not. The weak link has always been R-supp. The problem is
in finding a suitable resistor. Using resistance wire for L-supp helps a
bit. MOF resistors help a bit. -- Mr. Murphy was right. Everything
is more complicated than it looks. //. Congrats to Mr. G. W. Fyler.
Congrats to Mr. F. E. Handy.
cheers, John
>measures wrote:
>
>> >I will see if i can find it and get back to you. I t is getting near my
>> >bed time here on the eastcoast so it may be tomorrow before i can find it.
>> >John
>> >
>> Thanks, John, however I already have the info.
>>
>> - Rich..., 805.386.3734, www.vcnet.com/measures.
>> end
>
>
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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