[Amps] resistor tspa

[John T. M. Lyles]

John,
Nice call.

You can find noninductive high voltage resistors from Caddock and 
EBE, but they aren't really noninductive to higher frequencies. Ditto 
for Dale. However, you can get real noninductive resistors from 
Altronics in Arkansas, that they use in their dummy loads and also in 
snubber networks. These are BIG resistors though. They use thin film 
deposited on a ceramic tube. The standard for RF and noninductive 
applications, although the tolerence isn't great, is Kanthal Globar. 
Used to be Cesiwid, before that Carborundum Corp. These aren't cheap, 
but they are solid resistor (or a tube) made of bulk resistive 
material. You can get leaded for lower power or clip in that work in 
fuse clips or fancy finger stock caps for high power. Type SP and AS 
are the two compositions they will sell you. They aren't cheap (as 
none of these companies are) so bring lots of money, or check 
hamfests, as you can usually find small globars in the cigar box 
sales on tables.

73
John
K5PRO


>
>
>Date: Thu, 08 Feb 2007 07:39:27 -0500
>From: jmltinc at aol.com
>Subject: [Amps] Non-inductive Resistors
>To: amps at contesting.com
>
>Hello all,
>
>Am looking to load a 70cm amplifier grid with about 1K or less of resistance.
>
>This has probably been asked before, but what types of 
>"non-inductive" resistors are non-inducive up to 1 GHz? And, if 
>carbon composition is the only choice, where can you find 3W these 
>days?
>
>I have found some sources state carbon film and metal film resistors 
>are non-inductive, but rate them to 100 MHz.
>
>Thanks,
>-John, N9RF
>