4
Large-scale introduction of VHF broadcasting began only after
1945. Initially there were still many radios that were able to re-
ceive only the AM ranges – long wave, medium wave and short
wave. Many devices, however, could be upgraded with VHF ret-
rofit kits. During the 1950s the tube superhet with VHF range
became widely accepted.
This radio looks very much like a typical portable radio of the
1960s. The invention of the transistor allowed the construc-
tion of radios that consumed less power than valve receivers
and therefore could be operated with batteries. Apart from this,
they technically still resembled the older tube radios.
Thanks to the highly integrated receiver IC TDA7088 building
your own VHF radio has become so easy that anybody will be
successful in soldering this radio together. The single-ended
low frequency amplifier functions pretty much like the his-
torical tube radio. Your nostalgic radio works with a dual-stage
transistor amplifier with medium volume at low battery volt-
age. Now you only need two 1.5-V alkaline batteries for up to
100 hours of radio reception. With your DIY-radio listening to
the radio will become even more fun. Enjoy the diversity of the
VHF stations.
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