[Amps] Carbon film or metal oxide film resistors for low-power RF circuits?

[Alex Eban]

..soldering them is not so hard. Just get yourself a liquid flux pen- mine
is from Farnell, as it happens- put a small drop on both ends. Hold the part
with real fine points tweezers, solder one end with a very small amount of
solder, then the other end. Revisit the first end and touch up.
Remember, what's holding SMT parts in place is the solder that has wicked
under the part, not the blob visible at the end.
Alex	4Z5KS

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Jim Barber
Sent: Thursday, August 13, 2009 8:11 PM
To: Pete Lancashire
Cc: amps at contesting.com
Subject: Re: [Amps] Carbon film or metal oxide film resistors for low-power
RF circuits?

Very interesting responses, thanks.

DigiKey stocks some Stackpole RNC and "RNCS", which Stackpole claims are 
"Ideal replacement for costly Tantalum Nitride resistors" .

I wasn't able to quickly find stock on the Vishay-Dale parts in the 
usual places, but the data sheet looks good.

Now if I could only learn to solder surface-mount components without 
making such a mess.

Thanks and 73,
Jim, N7CXI

Pete Lancashire wrote:
> Not to push on company over another, I found some of this to be helpful
> 
> http://www.vishay.com/resistors-discrete/list/product-31025/
> 
> For those oldtimers, Vishey bought Dale.
> 
> 
> 
>> Hi Jim,
>>   I'd suggest using mil type RLR or if you realllly want long term
>> reliabilty use type RNC.
>>
>>   Either one will last near forever.  No comparison to carbon comp or
even
>> film.
>>
>> 73 & Good morning,
>>   Marv WC6W
>>
>> http://wc6w.50webs.com/
>>
>>
>> --- On Wed, 8/12/09, Jim Barber <audioguy at charter.net> wrote:
>>
>>> From: Jim Barber <audioguy at charter.net>
>>> Subject: [Amps] Carbon film or metal oxide film resistors for low-power
>>> RF circuits?
>>> To: "AMPS" <amps at contesting.com>
>>> Date: Wednesday, August 12, 2009, 1:06 PM
>>> 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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>>>
>>
>>
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