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2. Technical

Description

2-1. General

Model CB-880 is an mobile type AM/FM radio transceiver for use of the Citizen Radio Service.

Front Panel Controls

①

LCD (Cannel and RX/TX Signal Level Indicator).

②

Receiver Audio Control (With Power ON/OFF Control) Volume

③

Squelch Control Volume

④

RF Gain Control Volume

⑤

MIC GAIN Control Volume

⑥

CHANNEL UP/DOWN Rotary Switch

⑦

Q.CHANNEL UP/DOWN Rotary Switch

⑧

Memory(M1, M2, M3, M4) Key

⑨

DW(Dual Watch) Key

⑩

EMG(Emergency Channel Select) Key

⑪

AM/FM Select Key

⑫

Scan Key

⑬

CB/PA Slide Switch

⑭

ANL/OFF Slide Switch

⑮

LOCAL/DX Slide Switch

Accessorily Connectors

①

Antenna Socket

②

External Speaker Jack

③

External PA Jack

④

External Signal Meter Jack

⑤

Microphone(Condenser Microphone)

2-2.

Type of emission :

AM(A3E) , FM(F3E)

Содержание Freequency TCB-880

Страница 1: ...SERVICE MANUAL MULTI CHANNEL AM FM TRANSCEIVER TCB 880 TTI Tech Downloaded from www cbradio nl...

Страница 2: ...4 DESCRIPTION OF FREQUENCY DETERMINING AND STABILIZING CIRCUIT 5 TEST EQUIPMENT SETUP AND ALIGNMENT INSTRUCTIONS SECTION 5 3 LED PCB 3 PART LIST SECTION 5 1 MAIN PCB 5 2 5 4 VOLUME PCB 5 5 MIC PCB FR...

Страница 3: ...fication is subject to change without prior notice T R A N S M I T T E R R E C E I V E R G E N E R A L 40 See the frequency band chart 26 96 MHz 27 99125 MHz F3E FM A3E AM PLL Synthersizer 0 002 10 to...

Страница 4: ...Basic Synthesis Scheme 4 3 Descriptions of Each Block 4 3 1 Introduction 4 3 2 Reference Frequency 4 3 3 VCO 4 3 4 Programmable Divider and its Control 4 3 5 Phase Detector and VCO Control 4 3 6 Tran...

Страница 5: ...0 3 uV to 100 uV Sensitivity FM 20 dB SINAD under 1 0 uV RF Signal or less AM 10 dB S N under 1 0 uV RF Signal or less Intermediate Frequency 1st IF 10 695 MHz 2nd IF 455 KHz 1 2 Transmitter Carrier P...

Страница 6: ...Control Volume RF Gain Control Volume MIC GAIN Control Volume CHANNEL UP DOWN Rotary Switch Q CHANNEL UP DOWN Rotary Switch Memory M1 M2 M3 M4 Key DW Dual Watch Key EMG Emergency Channel Select Key AM...

Страница 7: ...45 15 27 135 35 27 355 16 27 155 36 27 365 17 27 165 37 27 375 18 27 175 38 27 385 19 27 185 39 27 395 20 27 205 40 27 405 2 4 RF Power Output z AM 1 0 W z FM 4 0 W 2 5 DC Iinput Voltage and Current w...

Страница 8: ...Mute Q202 KRC202S KEC AF Path Q233 KTA1504S KEC Automatic Level Control Q234 KTC3875S KEC Automatic Level Control Q301 KTC3880S KEC VCO Q302 KTC3880S KEC RX TX VCO Buffer Q303 KTC3880S KEC VCO Buffer...

Страница 9: ...C AF Path at AM Mode Q963 KRC111S KEC MIC AF Path at PA Mode 3 2 IC Ref No Description Manufacturer Function IC101 TK144889V TOKO IF IC IC102 KIA358F KEC AGC Squelch Control IC201 KIA7217AP KEC AF Pow...

Страница 10: ...esis Scheme The crystal frequency 4 5MHz is divided by 1800 times to make 2 5KHz which is fed to one side of the phase detector The VCO output is divided by a programmable divider and fed to other sid...

Страница 11: ...controlled PLL oscillator all outputs are coherent with the crystal oscillator frequency and matching the sample percentage accuracy Note that the reference frequency of 5KHz receiver and 2 5KHz trans...

Страница 12: ...7 165 3294 16 47 5433 13 5825 18 27 175 3296 16 48 5435 13 5875 19 27 185 3298 16 49 5437 13 5925 20 27 205 3302 16 51 5441 13 6025 21 27 215 3304 16 52 5443 13 6075 22 27 225 3306 16 53 5445 13 6125...

Страница 13: ...L Enable Pin 13 of IC801 Each input signal to control the PLL ic is done with provide key input Pin 18 19 25 26 27 28 29 32 33 34 35 37 For each key input an internal code converts EEPROM appropriate...

Страница 14: ...IF mixer section z SECOND MIXER The output of 10 24MHz oscillator circuit with X101 is injected into the IF IC IC101 internally Incoming IF signal and 10 24MHz signal are mixed inside the IF IC to ext...

Страница 15: ...reading is changed 1W under LOW state The turning is adjustment so that the actual power is from 3 8W to 4 0W There are no other additional controls for adjusting the TX output power D Modulation Cont...

Страница 16: ...stal filter CF101 The first IF is again mixed with a second local oscillator of 10 24MHz With the 10 240MHz signal IC101 FM IF IC converts the incoming signals to generate 2 nd IF signal and recovered...

Страница 17: ...Adjuster Adjust for 1 RX VCO voltage Adj Channel Frequency 1CH 26 956 MHz Mic Receive Volume Optional Squelch Optional RF Gain Optional Mic Gain Optional DC voltmeter to VCO Test point Figure 1 L301...

Страница 18: ...el Frequency 19CH 26 956 MHz Function AM or FM Mode CB ANL Off DX Mic Transmit No Mod Volume Optional Squelch Optional RF Gain Optional MIC Gain Optional Connect dummy load and Frequency Counter throu...

Страница 19: ...signal level to obtain by 1KHz deviation When you increase the audio signal by 20 dB the deviation should not exceed 2 0KHz deviation Figure 3 RV401 1 8KHz 2 0KHz 5 TX Signal Meter Adj Channel Freque...

Страница 20: ...l the audio output becomes about 2V 2 FM Audio Output Adj Channel Frequency 19CH 27 185MHz MIC Receive Function FM Mode CB ANL Off DX Volume Full clockwise Squelch Turn to counter clockwise RF Gain Fu...

Страница 21: ...1KHz 100uV 1 5KHz Dev Volume Full clockwise Squelch Full clockwise clockwise RF Gain Full clockwise Connect RF Signal Generator to EXT ANT Connector Connect AC Level Meter and Distortion Meter and SI...

Страница 22: ...iameter 4 mm x 15mm MAN 6 6 ECO050321 01 LCD PCB ASS Y 18 PCB LED FR 4 2 LAYER 1 0T MULTI MAN 1 1 19 PCB DISPLAY FRONT FR 4 2 LAYER 1 6T MULTI MAN 1 1 20 CHIP RESISTOR 1K 1 16W 5 T 1608 PHILIPS SMD 2...

Страница 23: ...050715 01 53 CHIP RESISTOR 100K 1 16W 5 T 1608 PHILIPS SMD 9 9 R140 R142 R159 R186 R188 R202 R233 R309 R311 54 CHIP RESISTOR 2M 1 16W 5 T 1608 PHILIPS SMD 1 1 R405 ECO050422 01 ECO050715 01 55 CHIP RE...

Страница 24: ...050715 01 87 CHIP CERAMIC 1UF 1608 PHILIPS SAMSUNG SMD 5 5 C159 C401 C402 C961 C962 88 CHIP CERAMIC 0 022UF 1608 PHILIPS SAMSUNG SMD 5 5 C166 C203 C214 C238 C403 89 CHIP CERAMIC 0 047UF 1608 PHILIPS S...

Страница 25: ...DZ921 128 DIODE SI CHIP KDS181 SOT 23 KEC SMD 1 1 D401 129 DIODE SI CHIP KDS184 SOT 23 KEC SMD 14 14 D102 D103 D105 D171 D180 D181 D233 D571 D572 D741 D742 D921 D961 D962 ECO050408 02 130 DIODE SI CHI...

Страница 26: ...L 1 5UH LAL03TR1R5K MAN 2 2 L102 L106 170 COIL AXIAL 6 8UH LAL03TB6R8K MAN 1 1 L706 171 COIL SPRING 2 5X0 8X7T R 0 11UH FINE FINE MAN 1 1 L704 172 COIL SPRING 4X0 5X6T R FINE FINE MAN 1 1 L712 173 COI...

Страница 27: ...er adhesive location side 23 SCREW Mach M3 8L TAPTITE BLACK B ECO 050319 01 same as item 18 Bonso 3 3 Bracket spk mounting 24 SCREW Mach M3 8L TAPTITE BLACK B ECO 050103 01 same as item 18 Bonso 1 1 B...

Страница 28: ...POWER CODE 2PIN RECEPRACLE ASS Y FINE 1 1 PACKING ASS Y 1 OWNER S MANUAL BONSO 1 1 2 GIFTBOX SW1E 2 0T BONSO 1 1 3 INNER BOX A SW1E 2 0T WHITE for RADIO BONSO 1 1 4 INNER BOX B SW1E 2 0T WHITE for AC...

Страница 29: ...13 5 45 4 x6 x3 x3 x4 10 7 5 11 44 16 48 54 29 56 55 57 9 x4 8 x4 6 19 18 17 51 26 27 50 28 53 14 35 52 20 21 23 22 20 2 36 3 12 1 x2 20 30 38 x3 x2 x2 x3 x3 43 49 37 41 42 x2 15 47 46 43 31 32 33 x2...

Страница 30: ...2 Zebra White sheet Diffuser Lens Reflector LCD TR 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53...

Страница 31: ...5 1 Main PCB Top side SECTION5 BOARD LAYOUT...

Страница 32: ...Main PCB Bottom side...

Страница 33: ...5 2 Front PCB Top side...

Страница 34: ...Front PCB Bottom side...

Страница 35: ...5 3 LED PCB Top side...

Страница 36: ...LED PCB Bottom side...

Страница 37: ...5 4 Volume PCB...

Страница 38: ...5 5 MIC PCB...

Страница 39: ...SECTION6 BLOCK DIAGRAM...

Страница 40: ...SECTION7 SCHEMATIC...

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