licence-exempt data transmission and remote control systems
In the UK, two small
sections of the 70-cm
band, around
418 MHz and
433 MHz, have been
available for some
time for licenceexempt
wireless communication
using
type-approved lowpower
devices
(LPDs), also called
short-range devices
(SRDs). In this article
we look at the use of
these frequency
bands, and some
general design considerations
for SRD
modules.
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