Another source of accurate frequency in most peoples houses is the TV set.
        Just run a wire across the top of the TV set and you can pick up the scan
        line frequency (depends what country you are in as to the actually
        frequency), this frequency is ok for a calibration check.

        If you know your TV set inside out then a more accurate frequency is the
        colour burst frequency that is locked into the TV stations accurate
        source.(WARNING don't go there if you don't know what you are doing)

I've heard that the days when the color burst was locked to a network
Rubidium standard are long gone and that the local Broadcast station is
generating its own burst reference from a master crystal timebase. It's
still going to within a Hertz or two of standard, but not so close that you
can use it to calibrate your frequency counter timebase.

It's been a long time since I've set foot in a TV transmitter plant, so
perhaps someone knows the answer to this for sure.

In any event, the horizontal sweep frequency is certainly plenty accurate to
check the time base and horizontal linearity on an analog 'scope.

Jack

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