-
BESANTEK
RECEIVER • Rx
The Receiver, or sniffer is a tuned receiver. The tuned
circuit comprises of a capacitor and an inductor (LC
tank circuit).
The inductor is situated in the tip of the sniffer.
The signal received on the tuned circuit is amplified,
then rectified and smoothed to transfer it to a DC level
signal.
The microprocessor reads that smoothed signal which
is proportional to the detected signal and display it on
a bar-graph.
The Sniffer also has a low battery detector and battery
ok circuit which lit the Bat LED when the battery is ok.
The buzzer is also driven by the microprocessor, so
that the user can listen to the pulses, in conjunction
with the bar-graph. The higher the level of the signal,
the quicker the pulses and the bigger the number of
Leds illuminated.
t s
•
·
•
-17-