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[AMPS] Non Inductive Resistors

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Subject: [AMPS] Non Inductive Resistors
From: measures@vc.net (Rich Measures)
Date: Fri, 5 Sep 97 20:27:53 -0800
>
>>There is no such thing as a non-inductive resistor.  The resistors we use 
>>in the suppressor retrofit kits (100 ohm, 3w Matsushita, MOF-type) have 
>>about 10nH - according to Wes, N7WS.  The longer the resistor, the more 
>>L.  A 100 ohm 100w globar-type has roughly 100nH [0.1uH].  At 28MHz, this 
>>amounts to only 17 ohms of X.  However, 1.6uH [1600nH] would be a bit 
>>much L, methinks. 
>>
>>R. L. Measures, 805-386-3734, AG6K   
>
>
>Rich,
>  I believe this is really getting too picky on the resistor subject.
>Of course all discrete components with any wire lead length will have
>some inductance. 
There was virtually zero lead length in the measurements.  The intrinsic 
L is in the resistor itself.    

>Anyone would know that. However, I think the guy is 
>trying to convey that they are not of the "wire wound variety" which 
>have a lot of inductance compared to carbon types...

There is a type of wirewound resistor in which the winding direction 
reverses in order to cancel some of the L.  I have such a resistor.  It 
is rated at 100w and it performs semi-okay up to about 2MHz.  
Rich---

R. L. Measures, 805-386-3734, AG6K   


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