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Anything is possible if you try hard enough. I know there is at least one modulator that can be directly set to channel 1, the Olson Technologies OTM-3000. Changing FM audio to AM is also possible, but not trivial.
To do any of these type of projects, it would help a lot to have some knowledge of RF and modulation circuits. One book that is very good is the ARRL Handbook. It is published by and for ham radio operators but is an excellent source of RF information for anyone. There is a new edition every year, but the basics have not changed in years, so you could find a bargain looking for any edition from the last 15-20 years or so.
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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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