[time-nuts] Re: As there a hobby application of precise time or frequency measurement except for being a time nut?

[john at miles.io]

You build good sources so that you have something to measure.  

You build good instruments so that you can measure good sources.  

You do these things not because they are easy, but because you thought they would be easy.  This is the Tao of Time and Frequency. 😊

-- john

-----Original Message-----
From: Erik Kaashoek via time-nuts <time-nuts at lists.febo.com> 
Sent: Friday, April 11, 2025 3:46 AM
To: time nuts <time-nuts at lists.febo.com>
Cc: Erik Kaashoek <erik at kaashoek.com>
Subject: [time-nuts] As there a hobby application of precise time or frequency measurement except for being a time nut?

Maybe the subject line is a bit clickbait but this is a serious question.
Hobby VNA are used to measure impedance for antenna, amplifiers, filters, PCB's and cables. Many applications for a VNA outside the professional world.
Hobby spectrum analyzers are user for hunting RFI, measuring harmonics of active devices, assessing what part of the spectrum is still available for wireless devices, etc... Again many applications.
But for time and frequency measurement the situation seems to be different. What are hobby applications for accurate assessment of stability, time or frequency?
For radio amateurs that operate in the GHz bands the accurate assessment of the frequencies of their generators is such an application but what other applications do exist and what are their requirements regarding accuracy?
I'm purposely excluding the applications where the accuracy is the goal instead of some usage for accuracy.
Any input is welcome.
Erik.
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