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 303 Q304 Q3 05 Q307 D30 1D302 VCO Q306 BUFFER TO MCU IC PIN 7-9 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 (Poland- 400CH CH. 1) TO 12.805MHz (Sweden CH. 24) 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 Q305,307 AND SURROUNDING PARTS ARE CONSISTING A CLAPP OSCILLATOR WORKS AS A VCO OF IC103 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 C313,Q304 WHEN THE VCO IS WORKING AS A RECEIVER, WHEN TRANSMITTING MODE, C313,Q304 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 Q902,D902,RV901 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 CONTROL), 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
D C B A LO DX 6 ANT VR501 RF GAIN POWER 13.2 VOLT + - RF BPF RF AMP MODULE Q501 RF ATTEN DA501,Q510 8 8 LCD DISPLAY CH9 Q.UP Q.DN AM/FM SCAN M1 M2 M3 M4 M5 DN UP SW101 X101 4.0MHz PA CB 5 PLL IC REGULATOR U702 1st MIXER Q502,503 D502,503 IC 101 CPU PLL IC IC6 X401 4.5MHz 4 CF501 10.695 MHZ AGC CTRL U701 RV101 RX S-METER BUFFER Q306 VCO LPF RX/TX SWITCH EEPROM P HI/LO 3 2 1 REVISION RECORD LTR ECO NO: APPROVED: DATE: U501 TK10931 SW601 CB PA AUDIO AMP U601 AM AMP AM DET AF VOLUME AUDIO ANL VR102 D504,505 Q508 EXT SPK FM LIMIT FM DET ANL AM/FM SW 2nd MIXER CF502 455K SPK OFF X501 10.24MHz SQ CTRL U701 T201 MOD TRANSFORMER EXT S-METER AM/FM CTRL AM MOD TX S-METER VCO Q408,D402 FM MOD MOD AMP AM MOD MIC AMP U6 CONTROL RV301 BUFFER Q504 U701 RV201 MIC AM MOD ADJUST ALC Q204,205 MIC GAIN ANT UNLOCK D407 DOUBLER Q402 PRE DRIVE Q403 DRIVER Q404 RF AMP LPF Q405 COMPANY: THAI RADIO COMPANY TITLE: DRAWN: DATED: CHUTCHAWAL P. ALAN48P 4W BLOCK DIAGRAM B+ REG CHECKED: DATED: CODE: SIZE: DRAWING NO: REV: QUALITY CONTROL: DATED: RELEASED: DATED: SCALE: SHEET: OF D C B A 1 3 2 SW203 SW201 B PA
CAM350 PRO V 7.0 : Tue Feb 03 13:19:42 2009 - (Untitled)
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