Quote:
Originally Posted by Steffen
surely something similar should have been viable in Australia?
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I recall some kits - possibly a Silicon Chip project - late 70's or early '80s that synced from VNG/WWV sold here, a few observers aiming to time Bailey's beads at solar eclipses built them, with both LED display and audio out that imitated the WWV beeps, and a frequency outputs which included 1kHz and 1s pulses for other things. Battery powered thing, about the size of a lunchbox, full of standard CMOS logic chips anyone could build with a soldering iron or wire-wrap pen.
Basically it had a local quartz oscillator to maintain time and synced when it could get a signal.
At the time my preferred clock was the HP41CX calculator which has a very interesting clock that is software-rate adjustable and stable to 1 part in 10^9. Using that to generate beeps it was OK to sync by ear to VNG 0.01 second, and I used it at a few eclipses and occultations.
The i41CX app for the iPhone/iPad includes the same clock functions, with the advantage that the iPhone syncs to GPS time as well, so if you want something that gives precise and accurately timed beeps, this is a very easy way to do it.