Ramsey Electronics FX-440 Manual page 88

FX SERIES TRANSCEIVER
Simplified Receiver Block Diagram
Assm. 28
LOW
PASS
FLT ER
HIGH
PASS
FLT ER
LIMITER
LM380 (U2)
AUDIO
AMPLIFIER
03
RECEIVE
PRE-AMP
21.885 MHz
LOCAL
OSCILLATOR
6·POLE
455 KHz
FLTER
6-POLE
455 KHz
FILTER
t----
RSSI
(OFTION>J.)
t----
SQUELCH
t------r
COR (OPTrct<ALJ
06
11---'""
RECEIVER
MUTING
SPEAKER
PLL CONTROLLED
vco
PROGRAMMED
21.4 MHz
LOWER THAN
THE RECEIVED SIGNAL
FX-440