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From: "Phil Allison"
References: <email@example.com> <firstname.lastname@example.org>
Subject: Re: Resistors for r.f. applications
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Fri, 3 Jan 2003 14:59:49 +1100
NNTP-Posting-Date: Fri, 03 Jan 2003 14:49:48 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"PCS Electronics" wrote in
> "Phil Allison" wrote in message
> > "PCS Electronics" wrote in
> > message news:l26R9.2295$tQ1.email@example.com...
> > > Carbon resistors are the most common type available today.
> > ** Yes, carbon film (spiralled) resistors, NOT carbon composition
> > material.
> > ............. Phil
> A renown RF specialist around here once wrote in an article that they are
> suitable, but at low values, I don't remember how much is low enough, but
I think he was using> 3x150 ohm in parallel in a 70cm (and above, if
assembled carefully) SWR bridge.
> I guess they start threading them from some value forward?
** Horse poo.
All values are all spiralled to get the final value. If you care to
scrape off some of the coating you will see for yourself. A 1.5 ohms 1/4
watt one I checked has two turns on a 2mm dia, 6 mm body. A similar 150 ohms
one has 7 turns in the same shape.
Nice little inductors. Paralleling inductors reduces the value.
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