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Vertical sweep rate is the same as NTSC: 60 cycles.
The horizontal sweep frequency is a bit lower, but you can feed a prewar RCA set standard NTSC; just adjust the horizontal hol control. There's more than enough range on the control to get sync at 15,734 cycles.
Sound isn't a problem, slope detection of the FM carrier works pretty well. The sound is a but distorted, but it's alright.
IIRC, channel 3 on the modern band plan directly correlates with one of the prewar channels, but I'd have to look it up.
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