From: "Phil Allison"
Subject: Re: Resistors for r.f. applications
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Date: Sat, 4 Jan 2003 10:26:16 +1100
NNTP-Posting-Date: Sat, 04 Jan 2003 10:16:18 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Ken Finney" wrote in message
> "Phil Allison" wrote in message
> > "John Woodgate" wrote in message
> > news:phuPecA6oTF+EweZ@jmwa.demon.co.uk...
> > >
> > > Yes, that's what I've found. I have some 47 ohm carbon comp parts, but
> > > they aren't 47 ohms at 10 MHz.
> > ** That is hardly credible John. How did you arrive at *that*
> > ??
> > CC resistors of such low values are within 10 % to 40 MHz, at
> > See WW October 1975 "Resistors" by R. A. Fairs and many other
> > sources.
> > .................... Phil
> A Mil-spec carbon comp is allowed to drift 42.4% over it's life and still
> meet spec, I doubt commercial carbon comps are any better. Carbon
> comps also absorb moisture; we used to reject so many at receiving
> inspection that we had to set up a special procedure, so that if they
> were out of tolerance, we would bake them, and then retest, and
> accept if the baking process brought them back into tolerance!
** The topic is resistor high frequency characteristics - not value