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From: "Phil Allison"
Newsgroups: sci.electronics.design
References: <6RoR9.16041$jM5.44442@newsfeeds.bigpond.com>
Subject: Re: Resistors for r.f. applications
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Date: Sat, 4 Jan 2003 12:49:37 +1100
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"Ken Finney" wrote in message
news:H85zE9.CpF@news.boeing.com...
>
> "Phil Allison" wrote in message
> news:6RoR9.16041$jM5.44442@newsfeeds.bigpond.com...
> >
> > "Ken Finney" wrote in message
> > news:H85F0v.EA@news.boeing.com...
> > >
> > > "Phil Allison" wrote in message
> > > news:g2fR9.15751$jM5.43507@newsfeeds.bigpond.com...
> > > >
> > > > "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*
> > > conclusion
> > > > ??
> > > >
> > > > CC resistors of such low values are within 10 % to 40 MHz,
at
> > > least.
> > > >
> > > > 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
> > tolerance.
> >
>
> You stated that they were "within 10 % to 40 MHz", I was only
> trying to point out "10% of what?".
** The DC value - Mr Pedant.
.................. Phil
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