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From: "Frank Dinger"
Subject: Re: "Non-inductive thick film resistors"
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Sun, 12 Jan 2003 11:28:34 -0000
NNTP-Posting-Date: Sun, 12 Jan 2003 11:32:48 GMT
Organization: ntlworld News Service
"Oppie" wrote in message
> The 'non inductive' resistors have the resistive film in a serpentine
> than a helical form so that the inductances cancel. The manufacturer
> be able to give a plot of impedance vs frequency.
> Farnell is a distributor, who is the manufacturer?
Caddock -Riverside , California is one of the manufacturers making these
Their 'KoolTab' models MP820 and 821 parts are in a TO-220 package with
values between 10 and 10000 Ohms and are very suitable for dummy loads and
as the input resistor(s) of valve (tube) type RF linear power amplifiers .
If fitted on a suitable heat sink max power dissipation is 20 Watts .
Standard items have a tolerance of 1%.
From 0.4 -100 MHz SWR = 1 : 1
at 500 MHz SWR = 1 : 1.04
at 1000 MHz SWR = 1 : 1.37
These SWR measurements have been made by someone in Germany ,using a Rhode &
Schwarz ,Scalar Network Analyser and sweep generator 0.4 - 2500 MHz
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