5 CIRCUIT DESCRIPTION AND SCHEMATIC DIAGRAMS
RE2100
DETECTOR
The detector circuit, which can demodulate A3E, H3E, R3E, and J3E is built-
up around U05. Switching between the two different detector modes, AM and SSB mode is controlled by
the microprocessor through U10, Q17 and the diode switching circuit built-up around D17-D20. AM: D18
and D20 ON, SSB: D17 and D19 ON.
AM MODE
In AM mode the principle is to remove the modulation from the IF signal through the limiting amplifier (pin
1) and leave just the carrier signal. This signal is then mixed with the original IF signal (pin 9) to create
the wanted AF signal (pin 6).
SSB MODE
In SSB mode the carrier reinjection signal (pin 1) is simply mixed with the IF signal (pin 9) and the AF signal
is then created.
U05 features a muting facility controlled by the microprocessor by applying voltage to pin 5.
25923B II
PAGE 5-2
9324
Содержание RE2100
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