On 4/1/2012 3:18 PM, Ed Mersich wrote:
My Heathkit, and other AC clocks have been broken for months now. I started
a project to figure out how bad it was. It's getting interesting as I am
approaching my goal of coding a software emulation of an AC line clock.
During the process I developed a couple of web pages to help me understand
the problem better. Frequency meter:
http://wa6rzw.homelinux.net/addon/grid/gauge/hertz.html
Grid history graph:
http://wa6rzw.homelinux.net/addon/grid/graph/wgraph_1.html
The meter requires a real HTML5 browser, anything but MSIE.
When I started this my goal was to provide an external reference source to
the Heathkit CG-1005, so that it will keep correct time. Since I began I
have considered a number of hardware solutions to correct or modify the
Heathkit. I think I am dragging my feet because there are no replacement
clock chips (in case of disaster,) to be found for this model. At the moment
I am thinking about modifying a DC-AC inverter and syncing it to an audio
oscillator, (don't laugh, my Heathkit 30 year old audio generator is way
better, more stable, than the grid).
73, Ed - WA6RZW
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I used to have a webpage bookmarked where they did this. The author of
the page hooked up a hydrogen maser to an HP3325b set to 60 Hz then
drove an HP bipolar amplifier with the 3325 to drive a mechanical flip
clock at 100 VAC @ 60.000000 Hz. Interesting page, is billed as Worlds
most accurate mechanical clock. OBTW, he had several HP cesiums
available too. . .
Randy, KI6WAS
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