EPEmag
M.W. Amplitude Modulator
Approx construction cost US$65

M.W. Amplitude Modulator - EPE Online November 2004

Enjoy your listening as you used to through your radios of bygone eras!

A popular pastime amongst amateurs is renovating and listening to old valve or transistor radios. These radios are usually a.m. only, tuning the Medium and Longwave bands, with maybe a Shortwave range. With the advent of high-quality stereo f.m. transmissions on VHF, and more recently DAB radio, a great deal of music and other material is unavailable to these radios. For those who like this “antique” sound quality, this situation is to be regretted!

The unit described here helps to make amends for this – it takes its input from the audio output of an f.m. or DAB receiver, or other modern audio source, and regenerates it into an a.m.-modulated format in the Medium Wave band suitable for feeding into the aerial input of your old radio. No modifications to the signal source equipment are needed.

This project originally appeared in the November 2004 issue of EPE Online.
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