dlt at earthlink.net
Mon Dec 4 06:08:50 GMT 2006
Sam B. Dlugach wrote:
> If DC power had prevailed, would early television transmission have even
> been practical in those pre-crystal-oscillator days without that
> ubiquitous 60Hz line reference?
Crystal controlled oscillators have been around longer than television.
The reason line lock existed was to reduce the difference between the
camera field rate and the instantaneous line frequency. You didn't want
the hum bar rolling through the picture - stationary was less distracting.
somewhere in Southern California
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