[time-nuts] Inductor core material aging (was: Rohde & Schwarz XSD 2.5 MHz crystal gone bad?)
kb8tq at n1k.org
Mon Nov 21 11:14:52 EST 2016
> On Nov 21, 2016, at 9:23 AM, Attila Kinali <attila at kinali.ch> wrote:
> Hoi Bob,
> On Sun, 20 Nov 2016 22:21:29 -0500
> Bob Camp <kb8tq at n1k.org> wrote:
>> 50 year old inductors may have been made with core materials
>> that aged more than just a little bit. I have empirical data on this :)
> Do you have that data available somewhere? I would be very much
> interested in it.
We had a few thousand oscillators that had to be replaced due to coil issues
in the 1970’s. We were not the only ones with the problem. Other outfits had very
similar experiences. Eventually the coil guys took a look at the materials and
“changed something”. After that the coils did not have as much aging when
run at 100C forever and ever.
> Attila Kinali
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