Ramsey Electronics FX-440 Manual page 20

Y2
c::::J
RAMSEY FX-SERIES FM TRANSCEIVER
(With emphasis on the PLL and VCO)
LOCK
DETECT
DIVIDE U5:A
07
PHASE
BY
LOOP
vco
DETECTOR
FILTER
1024
I
DIVIDE BY
-=
Ref. 18
U6
PROGRAMMING
Q3
RECEIVE
PRE-AMP
TXIRX
Pt>l SWITCH
06.
D7
02,017
RECEIVE
PRE-AMP
+aV RECV
+aVXMIT
64/65
PRESCALER
lJ3
MC3335 (U1)
DUAL CONVERSION
FM
RECEIVER IC
LM3BO (U2)
AUDIO
AMPLIFIER
PTT
U.-C,D
012-01-4
SYNTHESIZED
OUT PVT
FREQUENCY
018
vco
BUFFER
010
TRANSMIT
BUFFER
MIKE
AMP
U.-A,B
MICROPHONE
FX-440