[Amps] Carbon film or metal oxide film resistors for low-powerRFcircuits?

[Carl]

I like to use metal film in any circuit where component noise contribution 
must be at a minimum.
This especially means audio stages as well as synthesizers, PLL's, and 
anywhere digital circuitry is used.

Exceptions is in RF stages where even a little inductance may affect 
performance or cause instability.

Many years ago I replaced the cheap carbon film in the synthesizer of a 
TS-930 with metal film and picked up a solid 6dB improvement.

I dont know what the rice boxes use these days.

Carl
KM1H

----- Original Message ----- 
From: "Alex Eban" <alexeban at gmail.com>
To: <audioguy at charter.net>; "'AMPS'" <amps at contesting.com>
Sent: Thursday, August 13, 2009 3:10 AM
Subject: Re: [Amps] Carbon film or metal oxide film resistors for 
low-powerRFcircuits?


> ...definitely metal film!
> We had a lot of experience with these at Tadiran years ago.
> At the frequencies you mention stray inductance shouldn't be much of an
> issue. And stability wise you would be set for eternity.
> Alex 4Z5KS
>
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Jim Barber
> Sent: Wednesday, August 12, 2009 11:07 PM
> To: AMPS
> Subject: [Amps] Carbon film or metal oxide film resistors for low-power
> RFcircuits?
>
> If you wanted a precision RF instrument to last a long time without
> significant component drift, would you use carbon film or metal oxide
> resistors?
>
> Assumptions:
> (1) Little to no RF power dissipated in the resistors themselves
> (2) Frequency less than 60mhz
> (3) There would be room for physically larger 1-watt metal-oxide
> (4) Cost isn't an issue (repair quantities, mostly)
>
> Looking for opinions, of course. I find myself replacing carbon
> composition units all the time, and was wondering if metal-oxide would
> be "better" than carbon-film for these purposes.
>
> Thanks,
> Jim, N7CXI
>
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