ALAN48EXCEL-MULTI-all-papers.pdf

《ALAN48EXCEL-MULTI-all-papers.pdf》由会员分享，可在线阅读，更多相关《ALAN48EXCEL-MULTI-all-papers.pdf（32页珍藏版）》请在收音机爱好者资料库上搜索。

1、 Description Of Frequency Determining And Stabilizing Circuit Introduction The frequencies for transmitter and receiver local frequencies are all derived a signal 4.5 MHz crystal by means of a phase locked loop. The first local oscillator frequencies are 16.27 MHz (CH.1) to 16.71 MHz (CH.40). The se

2、cond local frequency is fixed at 10.240 MHz to generate second IF 455 KHz. During transmit, the VCO of the PLL operates 13.4825MHZ (CH.1) to 13.7025 MHz (CH.40). The VCO frequency goes to the doublers circuit Q301, L301, L302 which doublers the frequency to generate 26.965 MHz (CH.1) to 27.405 MHz (

3、CH.40). To Transmitter 13.4825MHz (CH.1) 26.965 MHz (CH.1) 13.7025 MHz (CH.40) 27.405 MHz (CH.40) The VCO operating frequency for the receiver is 16.27 MHz (CH.1) to 16.71 MHz (CH.40) as the first local oscillator, injected through the buffer amp Q506 into the first FET balanced mixer Q107, Q108 Des

4、criptions Of Each Block 1. Introduction The synthesizer is implemented with the following Components : PLL IC (IC6) X-TAL (X401) VCO, Varicap Diode (D503,504) IC101 is a MCU that includes LCD driver and all of control circuit. The PLL IC (IC6) of PLL block, The Q503, L404, C511, C512, C513, C507,Var

5、icap diode D503 and D504 are clap oscillator circuit to operate as a VCO. The Q505 is a switching transistor to turn on or turn off the tuning capacitor in the VCO oscillator tank circuit for transmitter or receiver. The Q506 works as a buffer amp for RX local frequencies (16 MHz) and TX carrier gen

6、erating frequencies (13 MHz). 2. Reference Frequency The crystal, X401(4.5 MHz) and other components at pin1 and 16 of IC6 can make a reference frequency oscillator with internal amplifier. 2-1. VCO The Q503 and surrounding parts are consisting a clap oscillator work as a VCO of IC6 with appropriate

7、 control voltage on D503 and D504, the can be oscillate over the required range of 13.4825MHz to 16.71 MHz. 2-2. Programmable Divider And PLL Data Control The MCU(IC101) and PLL IC (IC6) communicate by serial data for PLL IC data setting. The programmable inputs for each channels set by MCU (IC101).

8、 Each input signal to control the PLL IC is done with the provided key input pins 20 and 21 of IC101. Q503 Q504 VCO Q301 Doubler 2-3. 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 squa

9、re waves and develops a series of pulses whose DC level depends on the phase error of each signal. The phase detector pulse output is fed to an active low pass filter and RC low pass filter output signal of IC6 is filtered and fed to varicap D503 and 504 control the VCO frequency. TRANSMITTER / RECE

10、IVER BUFFER AMP Output signal of Q503 is fed into the buffer AMP Q506, L401 to increase the strength of TX carrier frequency and 1st local frequencies. Transmitter Doublers The output signal of Q506, L401 goes to an amplifier with tuning circuit Q301, L301, L302 which doubles incoming 13 MHz signals

11、. Switching Of Tuning Capacitor In VCO The VCO circuit must tune with a wide range of frequencies 13.4825 13.7025 MHz for transmitter and 16.27 16.710 MHz for receiver. To comply above range of VCO, the tuning Capacitance should switched for transmission or reception. The tuning circuit consists wit

12、h L401, C507, C512, C513, C522, when the VCO is working as a receiver Q505 becomes turn off. So, L401 AND D503,504 makes tuning function. When transmitting Q505 becomes on. So, L401 and the parallel capacitance of C522 and D503,504 make turning function. Receiver Local Oscillator outputs 1ST mixer :

13、 The secondary output signals of L401 is injected to the source of 1ST mixer Q107,Q108 in the 1ST IF mixer section. 2ND mixer : The output of 10.24 MHz oscillator circuit with X1 is injected into the IF module (IC102) . Incoming IF signal and 10.24 MHz signal are mixed inside the IF IC to extract 2N

14、D IF signal 455 MHz. FM and AM signals are recovered with envelope detector. Frequency Stability Let : Fo = Crystal Oscillator Frequency Fr = Phase Detector Reference Frequency Fvco = VCO Frequency Ft = Transmit Frequency Then : Fr = Fo/1800 And under locked conditions : Fr = Fvco / N Where , “N” is

15、 the programmable divider ratio. Then : Fvco = N X Fr From which it can be seen, the percentage error in Ft is the same as percentage error in Fo. The stability of the crystal oscillator is determined primarily by the itself and having passive components of the oscillator. The choice of crystal and

16、components is such that the required frequency stability is maintained over the required voltage and temperature range. Description Of Transmitter And Receiver 1. The Transmitter RF Amplification The output of doublers AMP Q301 is fed through tuning IFT L301 and L302 to the base of pre-driver AMP Q3

17、05. The output is then supplied through tuning circuit L303 to RF driver AMP Q306. The output of Q306 is supplied with tuning circuit L304, C321, RFC306 and goes to the base of final RF AMP Q307. The output of Q307 is supplied to the antenna through L-C tuning circuit. CIRCUIT FOR SUPPRESSION OF SPU

18、RIOUS RADIATION The tuning circuit between the output of final AMP Q303 and antenna, 7-stage “LPF” network L310, C331, C332, L311, C333, C335, L312, C337, serves as a spurious radiation suppressor. This network also serves to match the impedance between TX power AMP Q307 and the antenna. Circuits Fo

19、r Limiting Power After finished all alignment, to constant voltage supply circuit limits the available power 4 W or slightly less. RV-203 and corresponding three transistors control supply voltage of RF amplifier and other circuits. Tune all the trimming parts for maximum indication of RF power mete

20、r and adjust RV-203 to make 4 W indication of RF power meter. The tuning is adjusted so that the actual power is from 3.8 to 4.0 W. There are on other additional controls for adjusting the TX output power. Max Deviation Control The deviation signals are filtered with RC network and goes to the OP AM

21、P IC IC3 make nominal signal level to achieve wanted modulation. To control incoming audio signal, diode D451,452 and corresponding limiter circuit controls with proportional to sampled audio output level adjust RV501 shall not exceed 2KHz max deviation under 1.25 KHz AF 20 dB up from 1kHz modulatio

22、n level input. Max Modulation Control The modulation signal are filtered with RC network and goes to the audio AMP IC IC104 ma ke amplitude signal to achieved AM modulation. To control incoming audio signal, diode D202, Q208, and Q207 corresponding limiter circuit controls with proportional to sampl

23、ed audio output level adjust by RV201 shall not exceed 100% max modulation under 60% AF 20dB up from 1KHz modulation input. 2. The RECEIVER RF AMP Q104 amplify RF signal from antenna, the amplified RF SIGNAL is fed through tuning coils L102, L103 to the gate of double balance mixer FET, Q107, Q108 a

24、lso VCO sources frequency lower 10.695 MHz than the frequency of each channel is supplied to mixer. The source of 10.695MHz frequency filtered by CF1 is fed to through to IC102. The 455KHz frequency signal produced from IC102 by mixing the output source of CF1 10.695MHz filter and the source of 10.2

25、40MHz frequency from crystal oscillator X1. Internal AM and FM detector of IC102 detect AM and FM audio signal. A.G.C(Automatic Gain Control) signal of IC102 fed to IC103, D122, Q121 control receiving sensitivity. The AM detected audio signals fed through R157, C167, D151, VR101 to low frequency aud

26、io AMP for driving speaker. The FM audio detected and amplified audio signal is fed through high cut filter R161, C153, D152,VR101 to speaker. Alan 48 Excel Multi Explode No. Part number Name & Description Qty Remark 1. 623-344 (+)TAPPING SCREW(BH)3X8-2S BLK 3 2. 633-082 (+)TAP TITE SCREW BH3X6 BLK

27、4 3. 633-152 (+)TAP TITE SCREW BH3X4-3S BLK 2 4. 719-072 COVER UPPER SPC+VINYL SHEET T0.8 BLK 1 5. 719-073-A COVER BOTTOM SPC+VIN.SHT.T0.75 BLK(ALAN48+) 1 6. 730-015-A HOLDER(SPK) EGI T1 USCOATING 3 7. 891-590 CUSHION 25X25XT5 RUBB.SP0.BLK STIC. 1 8. 900-708 FELT &77XT0.3 FELT 1 9. 901-794-A FELT 8X

28、45XT0.3 FELT STIC.ALAN48PLUS 4 10. 611-095 (+)MACHINE SCREW(FH)2.6X5 ZN-PLAT 4 11. 801-317 E.S.C ABS 94HB BLK L380-9001 1 12. 814-286 LENS ACRYL 1 13. 826-404 KNOB SQL ABS 94HB BLK 2 14. 826-406 KNOB CH ABS 94HB BLK 1 15. 826-407 KNOB VOL ABS 94HB BLK 2 16. 881-613 SPRING(VOL.SW MTG) SK5 T0.25 2 17.

29、 895-572-D KONB FUNCTION SILICONE RUBBER 1 18. 906-867 DOUBLE TAPE(LENS) 3M-Y9448HK T0.16 1 19. 772-238 SHIELD HOUSING SPTE T0.3 1 20. 504-892 MOLEX PLUG ASSY 1 21. 613-305 (+)MACHINE SCREW(BH)3X8 ZN-PLAT 3 22. 613-332 (+)MACHINE SCREW(BH)3X10 ZN-PLAT 3 23. 621-420 (+)TAPPING SCREW(PH)2.6X8-2S ZN-PL

30、AT 2 24. 623-265 (+)TAPPING SCREW(BH)3X6-2S ZN-PLAT 8 25. 651-024 NUT SS41 M3-1S ZN-PLAT 6 26. 660-590 WASHER FIBER 7&X3.2& 1T RED 2 27. 662-305 WASHER (SPRING) M3 ZN-PLAT 4 28. 702-426-D BODY MAIN EGI T1.0 US COATING 1 29. 732-560 HOLDER(ANT MTG) SPTE T0.3 1 30. 750-766 CORD STOPPER PP 1 31. 760-70

31、4 HEAT SINK(IC MTG) ALP 30X18XT2 1 32. 761-801 HEAT SINK AL PLATE T2.0 1 33. 853-105 BUSHING NYLON66+GLASS 1 34. 771-850 SHIELD PLATE SPTE T0.5 1 35. 772-274-A SHIELD PLATE SPTE T=0.3 1 36. 772-678 SHIELD PLATE TIN T0.3 1 37. 906-998 TAPE CU 16X36XT0.05 CU-TAPE 2 38. 95B-180 LABEL MULTI POLYESTER 70

32、X70 1 39. 814-287 LENS LIGHTING ACRYL 1 40. 826-405 KNOB CB/PA ABS 94HB BLK 1 41. 906-868 BACK PLATE 54.3X22.8XT0.25 PC YELLOW 1 PL3361.TXT DEVELOPMENT : FINAL P A R T S L I S T # RIR610B DESIGN : FINAL = TECHNIQUE : FINAL Rev.: 038 S/W VERSION : UNDEFINED MODEL CODE : 3361 ALAN48XL MULTI 27MHZ 400C

33、H 4W ( ) 4/09/17 13:31:08 1 - - SEQ LEVEL PART-NO. NAME & DESCRIPTION QTY UT G KON OPT REFERENCE-NO ECO-DATE ECO-NO. - - 1 2 533-61C-A COVER ASSY 1.000 EA A 3/06/11 3 420-107-6 SPEAKER 8 OHM 3.0W 77MM P-302RL 1.000 EA B SUB 3/06/11 3 623-344 (+)TAPPING SCREW(BH)3X8-2S BLK 3.000 EA B SUB SPK MTG 3/08

34、/20 3 633-082 (+)TAP TITE SCREW BH3X6 BLK 4.000 EA B SUB UPPER/BOTTOM COVER MTG 3/08/20 3 633-152 (+)TAP TITE SCREW BH3X4-3S BLK 2.000 EA B SUB UP/BOTT REAR COVER MTG 3/08/20 3 719-072-E COVER UPPER SPC+VINYL SHEET T0.75 BLK 1.000 EA B SUB 4/07/05 C CT04-0592 3 719-073-A COVER BOTTOM SPC+VIN.SHT.T0.

35、75 BLK(ALAN48+) 1.000 EA B SUB 3/08/20 3 730-015-A HOLDER(SPK) EGI T1 USCOATING 3.000 EA B SUB SPK MTG 3/08/20 3 891-590 CUSHION 25X25XT5 RUBB.SP0.BLK STIC. 1.000 EA B SUB 3/08/20 3 900-708 FELT &77XT0.3 FELT 1.000 EA B SUB SPK HOLE 3/08/20 3 901-794-A FELT 8X45XT0.3 FELT STIC.ALAN48PLUS 4.000 EA B

36、SUB FRONT:2 BACK:2 3/08/20 2 2 533-61E-SC ESCUTCHEON ASSY 1.000 EA A 3/08/20 3 611-095 (+)MACHINE SCREW(FH)2.6X5 ZN-PLAT 4.000 EA B SUB ESC + MAIN BODY MTG 3/08/20 3 801-317 E.S.C ABS 94HB BLK L380-9001 1.000 EA B SUB 3/08/20 3 814-286-C LENS ACRYL 1.000 EA B SUB 4/07/24 C CT04-0659 Seite 1 PL3361.T

37、XT 3 826-404 KNOB SQL ABS 94HB BLK 2.000 EA B SUB SQL:1 RF:1 3/08/20 3 826-406 KNOB CH ABS 94HB BLK 1.000 EA B SUB 3/08/20 3 826-407 KNOB VOL ABS 94HB BLK 2.000 EA B SUB VOL:1 MIC:1 3/08/20 3 881-613 SPRING(VOL.SW MTG) SK5 T0.25 2.000 EA B SUB VOL:1 MIC:1 3/08/20 3 895-572-D KONB FUNCTION SILICONE R

38、UBBER 1.000 EA B SUB 4/01/26 A CT04-0073 3 906-867 DOUBLE TAPE(LENS) 3M-Y9448HK T0.16 1.000 EA B SUB 3/08/20 3 2 533-61E-SP ESP & DC MODULE ASSY 1.000 EA A 3/08/18 A CT03-KATHI 3 002-102-9Z FILM RESISTOR 1K 1/ 8W 5% ST 1.000 EA B MAN R2A 4/07/21 C CT04-0624 3 002-271-8Z FILM RESISTOR 270 1/ 8W 5% ST

39、 1.000 EA B MAN R4A 4/05/14 C AT04-KATHI 3 002-681-5Z FILM RESISTOR 680 1/ 8W 5% ST 2.000 EA B MAN R3A.8A 4/05/14 C AT04-KATHI 3 030-181-9Z FILM RESISTOR 180 1/ 2W 5% ST MINI 1.000 EA B MAN R1A 4/05/14 C AT04-KATHI 3 030-229-0Z FILM RESISTOR 2.2 1/ 2W 5% ST MINI 2.000 EA B MAN R7A.9A 4/05/14 C AT04-

40、KATHI 3 036-338-5 CEMENT RESISTOR 0.33 5W 5% ST 1.000 EA B MAN R5A 4/05/14 C AT04-KATHI 3 05B-100-2Z CHIP RESISTOR 10 1/16W 5% T 1608 1.000 EA B SMD R35 3/08/18 A CT03-KATHI 3 05B-101-3Z CHIP RESISTOR 100 1/16W 5% T 1608 1.000 EA B SMD R10 3/08/18 A CT03-KATHI 3 05B-102-4Z CHIP RESISTOR 1K 1/16W 5%

41、T 1608 4.000 EA B SMD R11.13.37.40 3/08/18 A CT03-KATHI 3 05B-103-5Z CHIP RESISTOR 10K 1/16W 5% T 1608 1.000 EA B SMD R2 3/08/18 A CT03-KATHI 3 05B-104-6Z CHIP RESISTOR 100K 1/16W 5% T 1608 7.000 EA B SMD R4.7.15.16.18.21.39 3/08/18 A CT03-KATHI 3 05B-222-9Z CHIP RESISTOR 2.2K 1/16W 5% T 1608 4.000

42、EA B SMD R6.9.14.RV1 3/08/18 A CT03-KATHI 3 05B-223-0Z CHIP RESISTOR 22K 1/16W 5% T 1608 8.000 EA B SMD R1.3.5.24.27.30.33.34 3/08/18 A CT03-KATHI 3 05B-224-1Z CHIP RESISTOR 220K 1/16W 5% T 1608 1.000 EA B SMD R38 3/08/18 A CT03-KATHI 3 05B-332-5Z CHIP RESISTOR 3.3K 1/16W 5% T 1608 1.000 EA B SMD R51 3/08/18 A CT03-KATHI Seite 2 PL3361.TXT 3 05B-472-8Z CHIP RESISTOR 4.7K 1/16W 5% T 1608 1.000 EA B SMD R17 3/08/18 A