[time-nuts] 60Hz More or Less

Ed Mersich wa6rzw at comcast.net
Sun Apr 1 22:18:16 UTC 2012


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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