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ALAN Electronics Tectalk FM PMR 446 Service Manual

2-way portable radio with fm broadcast receiver
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Tectalk(FM)
SERVICE MANUAL
2-WAY PORTABLE
PMR 446 RADIO
WITH FM BROADCAST
RECEIVER
Nov. 07. 2001
ALAN Electronics GmbH

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Summary of Contents for ALAN Electronics Tectalk FM PMR 446

  • Page 1 Tectalk(FM) SERVICE MANUAL 2-WAY PORTABLE PMR 446 RADIO WITH FM BROADCAST RECEIVER Nov. 07. 2001 ALAN Electronics GmbH...

  • Page 2: Table Of Contents

    CONTENT 1. GENERAL 1.1 General 1.2 Characteristic 1.3 Composition 2. SPECIFICATION 2.1 General Specification 2.2 Electrical Specification 3. OPERATION 3.1 Drawings of the radio 3.2 ICONS on LCD 3.3 Key Functions 3.4 Setting and Operation 4. ADJUSTMENT 4.1 Frequency synthesizer 4.2 Transmitter 4.3 Transmitter Test 4.4 Receiver...

  • Page 3: Characteristic

    1. GENERAL 1.1 GENERAL This equipment, Tectalk(FM) is called 2 way PMR 446 portable handheld radios. The frequency range is 446.00625 ~ 446.09375MHz, UHF operating Channels for European PMR 446 2 way portable radios. Also, this unit have built-in FM Radio which receives FM Broadcast Radio frequencies in the 87.5 ~ 108MHz band.

  • Page 4: Electrical Specification

    2.2 ELECTRICAL SPECIFICATION a) TRANSMITTER 1) Output power : Max. 0.5 W 2) Frequency Stability : +/- 5 ppm(-20°C to +55°C) 3) Modulation Method : FM 4) Oscillation Method : PLL SYNTHESIZER 5) Max. Frequency Deviation : < +/- 2.5 KHz (with tone) 6) Cooling Method : air-cooling Method 7) Spurious Emission TX: <...

  • Page 5: Operation

    3. OPERATION 3.1 Drawings of the radio FUNCTIONS AND CONTROLS 1) Battery Door 2) Monitor Button 3) Detachable Belt Clip 4) Push-To-Talk (PTT) Button 5) Antenna 6) External MIC / Speaker 7) Built-in Speaker 8) LCD Panel 9) Built-in Microphone 10) UP Button &...

  • Page 6: Icons On Lcd

    3.2 ICONS on LCD 1. RSSI (Receiving Signal Strength Indicator) or TX Bar Icon Indicates the receiving signal strength during transmission and it can be indicated the number of bar according to the strength of receiving signal. 2) Monitor Indicator Appears when the monitor button is used.

  • Page 7: Key Functions

    12) Large Segment Display Indicates the channel number in use at the normal mode. When the Function Button is pressed, it Displays the function menu in sequence: Ch / rdo / Sc / Uo / H00 / Sub / CAL / bEP / rog / tAL / [1] / [2] / [3] / P1 / P2 / P3 / P4 / P5 13) Small Segment Display Displays the FM frequency at the FM mode.
  • Page 8 3.3-2 FUNCTION BUTTON (#12) 1) Short Touch Press this button briefly to enter function edit mode in standby mode. 2) Long Touch - Press for longer than 1.5 seconds to activate the KEY LOCK in the standby mode. Please note all buttons will be disabled except the Monitor Button (#2) and PTT Button (#4) will remain fully operational.

  • Page 9: Setting And Operation

    2-Way Call Ringer Press the PTT Button twice quickly to call another party on the same channel and pressing the button once during and pressing the button once during a calling stops the calling and then returns to the standby mode. The user selected call ringer melody will play.
  • Page 10 2) CTCSS (Coded Tone Controlled Squelch System) SUB-CHANNEL SELECTION MODE This feature allows you to utilize a less used channel range (00-38) within a main channel. This enables you to communicate with another party on the same main channel using the same sub- code.
  • Page 11 3.4-3 CHANNEL SCAN MODE 1) NORMAL SCAN MODE This feature allows you to scan for an active channel and communicate with the party transmitting. The power saver is disabled in this mode. To access the Auto Channel Scan menu, Press the Function Button (#12) until the word “SC” appears in the LCD. - Press the Down Button (#11) or the Up Button (#10) to choose “nr”.
  • Page 12 3.4-4 VOX & VOX RECOVERY TIME SELECTION MODE 1) VOX SELECTION MODE The Voice Activated Transmission (VOX) function allows your voice to activate transmission automatically when the TECTALK FM is used with the optional Handsfree MIC/headset. It also allows Handsfree use when a MIC/headset is not being used without having to use the PTT Button (#4).
  • Page 13 3.4-6 SUB OPTION SELECTION MODE This mode allows you to enter the sub option selection mode. -Press the Function Button (#12) until the word “Sub” appears in the LCD. You can now select between “yes” or “No”. -If you press the Function Button (#12) when “yes” blinks on the LCD Panel (#8), you enter into the Sub Function edit menu.
  • Page 14 - Press Function Button (#12) at the CTCSS display option mode, You can select On or Off with Up(#10) or Down(#11) button. - When you press Enter Button (#13) or not press any key in 5 seconds, it returns back Stand-by mode with back beep sound after installation squelch tail elimination option its setting.

  • Page 15: Adjustment

    Service Manual 4. ADJUSTMENT 4.1 Frequency synthesizer (PLL) a) After connecting the power meter and dummy load (50 Ohms), join the Internal antenna connection points of TECTALK FM with above equipment. b) Check the voltage between TP & GND in digital volt meter. c) Then set the low channel of Tectalk(FM) the lowest frequency.

  • Page 16: Transmitter Test

    4.3 TRANSMITTER TEST a) Output Power Test Power(6.0V DC) should be Max.500mW and in +/- 20% range. b) Audio Response Connect AF oscillator to MIC terminal and then firm the audio level that doesn't distortion the wave of oscilloscope in the frequency range, 300Hz- 3kHz.

  • Page 17: Receiver Test

    d) Setting of Squelch sensitivity 1) Set the standard channel. 2) In squelch mode, SQ volume RV1 must be turned counterclockwise. 3) After adjusting SSG to channel frequency, the adjusting SSG to level. –120dBm set is audio on, -130dBm set is audio off. 4.5 RECEIVER TEST a) Audio Distortion Test 1) SSG should be adjusted like way of point b) and RF level sets to...

  • Page 18: Description Of Radio Circuit

    2) RECEIVER Rx does not work Speaker line open problem or connector problem. Receiver power circuit problem. Audio amplifier Base band IC U4 problem. Only noise sound U12 problem. VCO problem. Rx sensitivity is weak Antenna mounting problem. Front-End circuit problem. Local oscillation frequency deviation.
  • Page 19 5.2 RECEIVER This is composed of Dual Conversion Super Heterodyne. First IF is 21.7MHz. Local oscillator frequency is lower in 1'st IF than Rx frequency. It is called low side injection. Second IF is 450kHz. 2nd local oscillator frequency comes to 21.25MHz. a) Rx/Tx Conversion Circuit Rx signal goes to Rx/Tx conversion circuit through FIXED antenna connector, low pass filter(L5,L6,L7,C42,C43,C46,C47) and...

  • Page 20: Transmitter

    e) Squelch Circuit Noise component of detected outputs has amplification Squelch threshold is controlled by Resistor R18, C31, R15. f) Audio Amplifier Demodulated audio signal enters to pin2 of U4. After above signal Is amplified in U4 pin5 through C220, it comes out to pin5 Then, It reaches the speaker.

  • Page 21: Block Diagram

    6. BLOCK DIAGRAM...

  • Page 22: Schematic Diagram

    7. SCHEMATIC DIAGRAM...

  • Page 27: Component Partlist

    5. COMPONENT PARTLIST Tectalk(FM) Revised: November 8, 2001 Tectalk(FM).SCH Revision: ??? Bill Of Materials November 8, 2001 11:28:56 Page Item Quantity Reference Part _______________________________________________________________ B1,B2,B3 HH-1M2012-121 C12,C16,C36,C47,C48,C75, 10P C211,C212 C13,C14,C17,C21,C23,C24, 102 C31,C41,C52,C55,C64,C67, C83,C92,C99,C111,C113, C127,C130,C141,C147,C149, C154,C203,C207,C213,C215, C224,C225,C228,C230 C15,C45 C22,C27,C35,C50,C61,C66, 1u C122,C142,C214 C25,C26,C28,C33,C34,C51, 104 C56,C57,C65,C112,C115, C118,C121,C123,C125,C129,...
  • Page 28 C73,C205 C84,C156,C202 C85,C201 3.3/10T C86,C157 C101,C103,C107 22/4T C105 100/6E3 C106 47/16E C124,C126,C128 C132 C133,C233 820P C152,C177 C174,C226 C204 C219 C220 220/6E3 C222 CF450UG KDV154E D3,D6,D7,D10,D202 KDS114 D4,D5,D8 MCL4148 KDS122 KDS120 SR-2333H,RED SM-2233T,GRN LS4148 KDS184 D201 KDV1472 XX3P 30mmX2 WIRE STERO 2 2X1 10n,(E2-320904T-R) L2,L4,L9,L11,L12,L17,...
  • Page 29 L202,L206 47n,(CI-B1608) L5,L7,L8,L15 24n,(E2-281106T-R) L6,L18 28n,(E2-321306T-R) 39n,(CI-B1608) 31n,(E2-281106T-R) 8n2,(CI-B1608) L201 56n,(CI-B1608) L203 1n8,(CI-B1608) L205 100n,(CI-B1608) LCD1 OTC-2035 MIC1 CMP4540 Q1,Q2,Q7,Q8,Q10,Q202 BFQ67W Q3,Q201 2SC4083 DRF1601 BFP193 2SC4226 Q19,Q23,Q27,Q29,Q31,Q32, KRC404 Q205 KTA2015 Q24,Q203 KRA306 Q25,Q26 KRA305 KRA304 Q204 KTC4075 R1,R4,R35,R38,R54,R106, R107,R108,R141,R159,R216 R2,R5,R15,R19,R24,R30, R31,R32,R34,R44,R45,R52, R105,R112,R114,R115,R116, R126,R127,R128,R129,R131,...
  • Page 30 560K R21,R135 R25,R37 R3,R53,R101,R102,R208, R214 R23,R29,R111,R143,R147, 100K R151,R154,R160,R161,R174 R41,R212 R55,R213 R56,R171 R59,R302,R303 R60,R121,R136 R104 390K R109,R122,R156 R120 120,0.5W R123,R125 470K R124 R153 R158 R163 220K R172 270K R173 R217 120K SF1,SF2 446M SPK1 36-16BB-08 SW1,SW2 PM1188 HD4048899A-22TE CMX808A R1120N401B NJM386...
  • Page 31 AK93C45AV-L NJM2072M NJM324V R1120N331B TB31202FN DBL5018V U201 TDA7021T 10PM 10KM 4MHz 21.25MHz MF21.7M3...

  • Page 32: Exploded View

    9. EXPLODED VIEW...
  • Page 33 10. CHANNEL LIST Channel Frequency MHz 446.00625 446.01875 446.03125 446.04375 446.05625 446.06875 446.08125 446.09375...
  • Page 34 210.7 Hz 107.2 Hz 218.1 Hz 110.9 Hz 225.7 Hz 114.8 Hz 233.6 Hz 118.8 Hz 241.8 Hz 123.0 Hz 250.3 Hz 127.3 Hz 131.8 Hz © ALAN Electronics GmbH Nov. 2001 www.albrecht-online.de Service-Hotline (+49) 4154 849 180 e-mail: service@albrecht-online.de...

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