Quote:
Originally Posted by miniman82
*sigh*
If only there had been a crystal installed in the chassis, it would have made the mystery of what standard this chassis uses a lot easier to figure out that's for sure!
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Since the crystal is missing, I wonder if it would be feasible to connect either a sweep generator plus scope, or a spectrum analyzer with tracking generator, to various circuits in the chassis to figure out their resonant frequencies and bandwidths as currently tuned. Or, get a 3.89 MHz crystal along with a 3.57 MHz one, isolate and apply power to the oscillator circuit with each crystal, and see whether either or both work in the circuit and measure relative RF outputs to determine which frequency the circuit might have used when it last operated.
Here's another idea: Try using a dip meter near the various circuits, if it is possible.