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überarbeitet am 22.7.2010
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As an alternative to large domestic radios (the ones with the "piano keys"
and the green glowing "magic eye") and the small transistor radios,
which You could carry with You on trips, portable sets with above
average reception qualities have been designed in the sixties.
These " world band radios" provided not only reception of the domestic
stations on long and medium waves, or even the FM band, but they also gave
access to foreig radio stations in the shortwave bands.
In these years, technical progress allowed the shortwave segment to be spread
over several dial segments, which covered only one small part of the shortwave
spectrum each, but allowed to read the transmitting frequency of an unknown station
to help station identification or even to tune in a desired frequency with adequate
accuracy to find a stations's signal, without listening to several interval signals while
sweeping the band. Turret tuners with a rotary drum made small parts of the
shortwave spectrum visible in a dial window.
In the eighties, as digital frequency counters became affordable, these portable
radios became genuine "world receivers",
followed by portable sets with digital
PLL synthesis of the desired reception frequency. You could even store frequency
information in memory channel without having to order a specific frequency crystal.
The time line of the portable sets
gives You an overview over the development of the
portable receivers.
In some cases, allocating a set in the travel radio
or portable receivers section turns out difficult, in these cases You might try both sections
or consult the receiver list.
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