Roughly two years ago, the carrier trequency ot the 400-kW
long-wave Droitwich transmitter was changed trom 200 kHz to
198 KHz. This was done by the BBC to comply with the
internationally agreed 9-kHz spacing tor broadcast stations in the
medium- and long-wave bands. The trequency change ot 2 kHz was
largely unnoticed by thousands ot listeners ot the Radio Four and
BBC World Service programmes. Not so, however, by the many
users ot trequency standards and timebase circuits which derived
their stability trom the 200 kHz carrier. All these circuits became
useless overnight since the new trequency, 198 kHz, can not be
divided to give multiples ot 10Hz. Fortunately, there is a way to get
your timebase ticking again. An update tor our own Droitwich
receiver, an immensely popular project which goes back as tar as
1977, is described here.
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