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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Yttrium iron garnet
Date: Wed, 29 May 2024 10:37:52 -0700
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On Wed, 29 May 2024 17:12:21 -0000 (UTC), Cursitor Doom
<cd999666@notformail.com> wrote:

>On Wed, 29 May 2024 13:52:34 +1000, Bill Sloman wrote:
>
>> Yttrium iron garnet tuned oscillators were around back then, but their
>> 2GHz to 8GHz range was too high for me to count with the integrated
>> circuits around then - we had to go the Gigabit Logic's GaAs parts to
>> get to 800MHz, and that became the unique selling point of the system.
>
>YIG oscillators were quite the thing back in the day, but I'm guessing 
>they've been completely superseded by now to get to ever higher 
>frequencies. Seems we've gone from -
>
>R/C to L/C to Xtal to YIG since about 1900. Did I miss any development(s) 
>out pre-YIG?

Tuning forks, SAWs, BAWs,  mechanical ceramic resonators, dielectric
ceramic resonators, coaxial ceramic resonators, sapphire, cavities,
atomic things.