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Ramsey Electronics made several frequency counter kits in the late 1970s to early 1980s, and they also had a kit called a "frequency counter calibrator". It was a 3.58 MHz oscillator that you wired into your working color TV set, and it would phase-lock to the TV set's chroma oscillator. You then tuned the set to a network TV show (they were specific about that), and then adjusted the counter to display exactly 3.579545 MHz. It was interesting-all of the networks were within 1 Hz, and some of the local stations were off by several Hz or more.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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