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This is an excellent time to practice with your new oscilloscope. There are books on using them, including one or more I found online (Oscilloscope Fundamentals from Tektronix is one). It should not be hard to connect it to see the signal in your horizontal oscillator, then check its frequency by matching the number of pulses on the scope screen to the scope's horizontal sweep setting (such as 100 microseconds (or 0.1 milliseconds) per division, the squares on the screen each being a "division").
If I have it right, a 15.75 kHz pulse is 63 microseconds, so you should see about three of them per every two divisions on a scope set for 100 uS/div or 0.1 mS/div, and adjusting the horizontal frequency would change the width of the pulses on the screen (and therefore, the number of pulses per division). This is just one example of a scope setup.
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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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