ALAN 48P 4W SMT MULTI CIRCUIT DESCRIPTION
INTRODUCTION
1.Multi BAND:Italy,Italy-34CH, Germany-80CH, Germany,Germany-80CH-40CH-4W
Spain, Europe, CEPT,
England, England-CEPT, Poland ,Poland-400CH,
Russi
a-400CH ,France,Sweden
2. BLUE COLOR DISPLAY
3 . THE
FREQUENCIES
FOR
TRANSMITTER
AND
RECEIVER
LOCAL
FREQUENCIES ARE ALL DRIVEN FROM A SINGLE 10.240MHz CRYSTAL (X501)
BY MEANS OF A PHASE LOCKED LOOP.
THE FIRST LOCAL OSCILLATOR FREQUENCIES ARE 14.915MHz(Poland-400CH
CH.1) TO 20.875MHz(Sweden CH.24) FOR RECEIVER. THE SECOND LOCAL
FREQUENCY IS FIXED AT 10.240MHz(X501) TO GENERATE SECOND IF 455
〔KHz〕. DURING TRANSMIT, THE VCO OF THE PLL OPERATES 12.805MHz TO
15.785MHz.
Q301 Q302 Q
Q306
303 Q304 Q3
BUFFER
TO MCU IC PIN 7-9
05 Q307 D30
1D302
VCO
RX LOCAL FREQUENCY : 14.915MHz(Poland-400CH CH.1) TO 20.875MHz
(Sweden CH. 24)
TX FREQUENCY
: 12.805MHz TO 15.785MHz
THE VCO OPERATING FREQUENCY FOR THE RECEIVER IS 14.915MHz
4 0 0 C H CH. 1) TO 1 2 . 8 0 5 MHz ( S w e d e n CH. 2 4 )
(Poland-
AS THE FIRST LOCAL
OSCILLATOR, INJECTED THROUGH THE BUFFER AMP Q306 INTO THE FIRST
TR MIXER
Q502,Q503
DESCRIPTIONS OF EACH BLOCK
INTRODUCTION
THE SYNTHESIZER IS IMPLEMENTED WITH THE FOLLOWING
COMPONENTS : PLL IC(IC103), CRYSTAL(X401) VCO, VARICAP DIODE(D301)
THE IC 103 IS A HIGH PERFORMANCE DUAL FREQUENCY SYNTHESIZER WITH
TWO INTEGRATED HIGH FREQUENCY
PRE-SCALARS
FOR
RF OPERATION
THE Q305,Q307,Q301-304,L301,C314,D301,C309,C316,C317,C319 ARE CLAP
OSCILLATOR CIRCUIT TO OPERATE AS A VCO OF THE IC103.
THE Q304 IS A SWITCHING DIODE TO CONNECT OR DISCONNECT THE TUNING
CAPACITOR IN THE VCO OSCILLATOR TANK CIRCUIT FOR
TRANSMITTER OR
RECEIVER.
THE Q306 WORKS AS A BUFFER AMP FOR RX LOCAL FREQUENCIES AND TX
CARRIER GENERATING FREQUENCIES.
THE Q301-303 IS A SWITCHING DIODE TO CONNECT OR DISCONNECT THE
TUNING CAPACITOR IN THE VCO OSCILLATOR TANK CIRCUIT FOR BAND
SELECT.
REFERENCE FREQUENCY (CRYSTAL)
THE CRYSTAL, X401(4.5MHZ) AND OTHER COMPONENTS AS PIN.14 OF IC10
3 AND IC101 CAN MAKE A REFERENCE FREQUENCY OSCILLATOR WITH CK (Pi
n8), DATA (Pin9), EN (Pin7) TERMINALS IN IC103 ARE USED FOR MCU SERI
AL DATA INTERFACE . THIS SET IS USED EXTERNAL CLOCK SOURCE BY THE
CRYSTAL. THE REF_FREQUENCY(4.5MHz) IS ADJUSTED BY CT401 EXACTLY.
VCO
THE Q 3 0 5 , 3 0 7 AND SURROUNDING PARTS ARE CONSISTING A CLAPP
OSCILLATOR WORKS AS A VCO OF I C 1 0 3 WITH APPROPRIATE CONTROL
VOLTAGE ON D301.THE VCO CAN BE OSCILLATE OVER THE REQUIRES RANGE
OF 12.805MHz TO 20.875MHz .
PHASE DETECTOR AND VCO CONTROL
THE PHASE DETECTOR IS A DIGITAL PHASE COMPARATOR WHICH COMPARES
THE PHASE OF THE REFERENCE SIGNAL WITH PROGRAMMABLE DIVIDER
OUTPUT SQUARE WAVES AND DEVELOPS A SERIES OF PULSE WHOSE DC
LEVEL DEPENDS ON THE PHASE ERROR OF EACH SIGNAL.
THE PHASE DETECTOR PULSE OUTPUT IS FED TO AN ACTIVE LOW PASS FILTE
R, AND FED TO VARICAP D301 CONTROL THE VCO FREQUENCY.
SWITCHING OF TUNING CAPACITOR
IN VCO
THE VCO CIRCUIT MUST USE WITH A WIDE RANGE OF FREQUENCIES 12.805
MHz TO 15.785MHz FOR TRANSMITTER
AND 14.915MHz(CH.1) TO 20.875MHz
FOR RECEIVER.
TO COMPLY ABOVE RANGE OF VCO, THE TUNING CAPACITANCE SHOULD
SWITCHED FOR TRANSMISSION OR RECEPTION.
THE TUNING CIRCUIT CONSISTS WITH
C 3 1 3 ,Q 3 0 4 WHEN THE VCO IS
WORKING AS A RECEIVER, WHEN TRANSMITTING MODE, C 3 1 3 ,Q 3 0 4
BECOMES TURN ON. WHEN RECEIVING MODE, C313, Q304 BECOMES OFF,L301
AND THE
D301 CAPACITANCE OF MAKE TUNING FUNCTION.
RECEIVER LOCAL OSCILLATOR OUTPUTS
1ST MIXER : THE OUTPUT SINGLES OF Q305 IS INJECTED TO THE
SOURCES OF 1ST MIXER Q502-503 IN THE 1ST IF MIXER SECTION.
2ND MIXER : THE OUTPUT OF 10.240MHz OSCILLATOR CIRCUIT WITH X501 IS
INJECTED INTO THE U501. INCOMING IF SIGNAL AND 10.695MHz SIGNAL ARE
MIXED INSIDE THE U501 TO EXTRACT 2ND IF SIGNAL 455 KHz.
DESCRIPTION OF OTHER CIRCUITS
TRANSMITTER
RF AMPLIFICATION
THE OUTPUT OF BUFFER AMP Q402 IS FED THROUGH TUNING C326,L401A,L40
2A TO THE BASE OF PRE DRIVER AMP Q403. THE PRE DRIVER AMP OUTPUT
SIGNAL FED THROUGH TO DRIVER AMP(Q404), FED THROUGH TO POWER
AMP(Q405) TO THE ANTENNA.
CIRCUIT FOR SUPPRESSION OF SPURIOUS RADIATION
THE TUNING CIRCUIT BETWEEN THE OUTPUT OF FINAL AMP Q 4 0 5 AND
ANTENNA, 3 STAGE "LPF TYPE" NETWORK L409, L410, L411,L412,L413,LA401,C4
26, C427, C429, C430,C434,C435,C438,C439,CA401,RA401 SERVES AS A
SPURIOUS RADIATION SUPPRESSOR.
THIS NETWORK ALSO SPURIOUS RADIATION SUPPRESSOR.
THIS NETWORK ALSO SERVES TO MATCH THE IMPEDANCE BETWEEN TX
POWER TR Q405
AND ANTENNA.
MAXIMUM MODULATION CONTROL
MODULATION SIGNALS ARE FILTERED WITH RC NETWORK AND GOES TO THE
AUDIO_AMP IC(U601) TO MAKE NOMINAL SIGNAL LEVEL TO ACHIEVE WANTED
MODULATION.TO CONTROL INCOMING AUDIO SIGNAL BY ALC CIRCUIT. THE
ALC ARE Q 9 0 2 ,D 9 0 2 , R V 9 0 1
THAT’S CIRCUIT CONTROL MAXIMUM
MODULATION CAPABILITY
AND MAXIMUM MODULATION LIMITTING.
RECEIVER
(1) RF AMP Q501 AMPLIFY RF SIGNAL FROM ANTENNA(Q505 Q506 BAN
D C O N T R O L ) , AND THEN THE AMPLIFIED RF SIGNAL IS FED THROUGH
MIXER(Q502 Q503) TO THE BASE OF MIXER Q502 Q503, ALSO VCO SOURCE'S
FREQUENCY LOWER 10.695MHz THAN THE FREQUENCY OF EACH CHANNEL IS
SUPPLIED TO MIXER.
(2) THE SOURCE OF 10.695MHz FREQUENCY IS FED THROUGH CF501
TO 2’ND MIXER U501.
(3) THE 455 KHZ FREQUENCY SIGNAL IS PRODUCED FROM U501 BY
MIXING THE OUTPUT SOURCE OF CF501 10.695MHz FILTER AND THE SOURCE
OF 10.24MHz FREQUENCY FROM CRYSTAL OSCILLATOR X501.
(4) THE U501 IS IF AMP, AND D505(AM&FM) BOTH IS DETECT DIODE.
AUDIO SIGNAL RECOVER BY THAT DIODE.
THE AUDIO SIGNAL IS FED THROUGH C530 TO AUDIO POWER AMP(U601) FOR
DRIVING SPEAKER.
AL-48P multi 4w(2sc2078) sch..sch-1 - Thu Oct 22 17:37:02 2009
A
B
C
D
DX
SW203
LO
-
+
POWER 13.2 VOLT
RF GAIN
VR501
ANT
RF ATTEN
SW101
DN
M5
M4
M3
M2
M1
SCAN
AM/FM
Q.DN
Q.UP
CH9
UP
LCD DISPLAY
X101
CB
SW201
PA
Q501
RF AMP
4.0MHz
DA501,Q510
88
MODULE
RF BPF
3
6
2
1
PLL IC
REGULATOR
U702
5
4.5MHz
X401
CPU
IC 101
IC6
PLL IC
1st MIXER
Q502,503
D502,503
EEPROM
P HI/LO
RX/TX SWITCH
B
DRAWN:
DATED:
REG
RELEASED:
QUALITY CONTROL:
CHECKED:
DATED:
DATED:
DATED:
Q403
Q402
CHUTCHAWAL P.
PRE DRIVE
DOUBLER
MIC GAIN
U701
MIC AMP
D407
Q504
MIC
AM/FM CTRL
FM DET
FM LIMIT
SCALE:
TITLE:
DRIVER
Q404
Q204,205
ALC
U6
MOD AMP
2
LPF
PA
SIZE:
SHEET:
DRAWING NO:
APPROVED:
OF
THAI RADIO COMPANY
Q405
RF AMP
CONTROL
AM MOD
T201
MOD TRANSFORMER
OFF
ANL
SW601
AF VOLUME
VR102
CB
ECO NO:
AM MOD
RV201
AM MOD ADJUST
Q508
D504,505
AM/FM SW
ANL
U601
AUDIO AMP
AUDIO
LTR
1
REVISION RECORD
ALAN48P 4W BLOCK DIAGRAM
CODE:
COMPANY:
U701
SQ CTRL
AM DET
AM AMP
UNLOCK
BUFFER
Q408,D402
RV301
FM MOD
U501
TK10931
TX S-METER
455K
Q306
VCO LPF
3
CF502
BUFFER
B+
10.24MHz
X501
2nd MIXER
VCO
U701
AGC CTRL
RX S-METER
RV101
10.695 MHZ
CF501
4
REV:
ANT
PA
EXT S-METER
SPK
EXT SPK
DATE:
A
B
C
D
CAM350 PRO V 7.0 : Tue Feb 03 13:19:42 2009 - (Untitled)
CAM350 PRO V 7.0 : Thu Jul 23 11:26:33 2009 - (Untitled)
CAM350 PRO V 7.0 : Tue Feb 03 13:20:31 2009 - (Untitled)