From: John Woodgate
Subject: Re: Resistors for r.f. applications
Date: Sat, 4 Jan 2003 15:38:34 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Sat, 4 Jan 2003 16:23:39 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Phil Allison
wrote (in ) about
'Resistors for r.f. applications', on Sun, 5 Jan 2003:
>In most situations the inductance of a resistor at 10 MHz and above
>does not matter a hoot. But in some it very much does. One is with dummy
>loads for terminating co-axial cables and testing RF power output and
>another is in precision RF attenuators for test and measurement work.
>Usually these jobs involve fairy low value resistors, from 10 to 1000 ohms.
Yes, that's what I'm doing; terminating a signal source that requires 50
ohms, the voltage (and thus the power) matters and this is measurement
work - testing 'balanced' cables for mode conversion at radio
I've scrapped the 1 ohm current sensor in favour of a toroidal current
transformer, as that solves some earthing problems and leads to a
simpler test jig. So it's only the 50 ohms that I need now. Someone has
offered me some more 47 ohm Erie type 9, which may be the solution.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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