Re: ZN414 -- Where used?
40 years ago I worked for a component retailer. After the 1978 frequency changes, BBC
schools programmes were broadcast daytime on R4FM, with the standard programmes on
LW. A lot of imported tuners/tuner-amps had no LW, so I made and sold a batch of
LW-FM converters, with the ZN414 audio modulating a 2 transistor FM bug tuned to
about 104 FM. 30 were made, my first "product". A while after this R4 was also
transmitted on 720kHz MW in London, and demand ceased.
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