June 2024
Intermediate to advanced
280 pages
11h 5m
English
Content preview from Make: Radio
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112 Make: Radio
The idea is to use a resonance circuit and tune
it to the transmission frequency. The coil of
the resonance circuit acts as the antenna, and
because the circuit is tuned to resonate only
with the intended transmission frequency, the
harmonics will be filtered out. The result is a
cleaner signal and a longer transmission range.
CONSTRUCTION
The schematic for the new antenna circuit is
shown in Figure
6-7
, and the breadboarded
version is shown in Figure
6-8
. The upper part
of the circuit remains the same, but the antenna
loop has gone and is replaced by a coil named
L1. Next to it is L2, which is connected to a tuning
capacitor. Before ...
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