UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - ZN414 -- Where used?

Restoration73 · 7th Nov 2019, 2:05 pm

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.

7th Nov 2019, 2:05 pm	#18
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	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.