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Alan Tectalk Service Manual

2-way portable handheld pmr 446 radio
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Tectalk
SERVICE MANUAL
2-WAY PORTABLE
HANDHELD
PMR 446 RADIO
Nov. 07. 2001
ALAN Electronics GmbH

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Summary of Contents for Alan Tectalk

  • Page 1 Tectalk SERVICE MANUAL 2-WAY PORTABLE HANDHELD PMR 446 RADIO Nov. 07. 2001 ALAN Electronics GmbH...

  • Page 2: Table Of Contents

    CONTENT 1. GENERAL General Characteristic Composition 2. SPECIFICATION 2.1 General Specification 2.2 Electrical Specification 3. OPERATION 3.1 Key Name 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 4.5 Receiver Test 4.6 Symptoms, check point &...

  • Page 3: Characteristic

    1. GENERAL 1.1 GENERAL This equipment, Tectalk is called 2 way portable handheld radios. The frequency range is 446.00625 to 446.09375MHz, UHF operating channels for Europe-wide used 2 way portable radios according to PMR-446 Standard. 1.2 CHARACTERISTIC a) All active device in this radio is composed of semiconductor and high density IC.
  • Page 4 6) Cooling Method : air-cooling Method 7) Spurious Emission TX : < -36dBm 8) FM Hum/Noise : > 40dB(1kHz 60% modulation) 9) Distortion : < 5% (1kHz 60% modulation) 10) Tx Audio Response : 6dB /OCT +/- 3dB PRE-EMPHASIS(300Hz to 2.5kHz) b) RECEIVER 1) Receive Method : Double Super Heterodyne 2) Receive Sensitivity : -118dBm up (20dB SINAD W/CCITT)

  • Page 5: Operation

    3. OPERATION 3.1 Drawing of the radio FUNCTIONS AND CONTROLS 1) Battery Door 11) Down Button & Volume Control 2) Monitor Button 12) Function Button 3) Detachable Belt Clip 13) Power On/Off & Enter Button 4) Push-To-Talk (PTT) Button 5) Antenna 6) External Mic / Speaker 7) Built-in Speaker 8) LCD Panel...

  • 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. It (TX Bar) is not transformed. 2) Monitor Indicator Appears when the monitor button is used.

  • Page 7: Key Functions

    10) Rx Indicator Appears when a signal is being received. 11) 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 / ctc / SC / dW / VO / Vdt / ALo / CAL / tON / tAL / bEP 12) Small Segment Display Displays the CTCSS tone option at the normal mode.
  • Page 8 3.3-3 UP BUTTON (#10) 1) Short Touch In the standby mode, press this button briefly to move to the next higher main volume level. In the function edit mode, press briefly to shift from the current option in each submenu to the next option in the same submenu. 2) Long Touch Pressing this button for more than 1.5 seconds will allow you to navigate at a more rapid rate through different volume level in the standby mode or...

  • Page 9: Setting And Operation

    3.3-6 MONITOR BUTTON (#2) Press it to check activity on the current channel before you try to transmit. - Adjust the Volume Control (#10, #11) if necessary. When you press the Monitor Button, the LCD Panel (#8) will be illuminated with an amber color back-light and both the Tx and Rx LED indicators will light.
  • Page 10 same main channel using the same subcode.This helps to avoid congestion on the main channel and filters out unwanted noise and static. There are 38 CTCSS subchannels for each main channel. To change the CTCSS subchannel, Press the Function Button (#12) until the word cTc appears in the LCD Panel (#8).
  • Page 11 appears in the LCD Panel (#8). - Press the Up Button (#10) or the Down Button (#11) to select the desired channel number you wish to closely monitor. - Press the Enter Button (#13) to confirm your selection. - To turn off the dual watch feature in the standby mode, simply press the Function Button (#12) once.
  • Page 12 Press the Up Button (#10) or Down Button (#11) to select the Auto option. Press the ENTER key to confirm your selection. If you do not press any key for more than 15 seconds in the standby mode, all respective keys will automatically be locked. To turn the auto key lock on or off in standby mode, simply press and hold the Function Button (#12) for more than 1.5 seconds.

  • Page 13: Adjustment

    3.4-11 BEEP TONE SELECTION MODE This feature allows you to program beeping or not beeping with key selection. To set key beep mode, press the function key at the squelch tail ON /OFF mode at the same time operate beeping according to the tone of key beep. You can select On or Off with Up or Down key.

  • Page 14: Transmitter Test

    b) Connect DC 6.0V, voltage preset to EUT. c) Connect "power meter" & "dummy load (50 Ohms)". d) Adjust Tx frequency according to trimming trimmer VC2. e) Connect AF oscillator to mic terminal for conform modulation degree. f) Adjust the frequency of AF oscillator to 1kHz and adjust AF level should be 60mV.

  • Page 15: Receiver Test

    C) Conform of Rx sensitivity 1) Adjust SSG to channel frequency. 2) Adjust modulation frequency, 1kHz to modulation degree, 1.5KHz. 4) After adjusting the frequency of SSG to channel frequency, RF level sets to -47dBm. d) Conform of Squelch sensitivity 1) Set the standard channel.

  • Page 16: Description Of Radio Circuit

    - Fail to transmit Run out of battery or charge problem. Fault of PTT key. Fault of Q4, Q5. - Transmitter works but frequency is unmatched Out of order in frequency synthesizer. Out of order in X-tal(X2). - Audio does not sound(Tx power and Tx frequency are normal) Problem of microphone or Mic connector.
  • Page 17 b) PLL IC PLL IC is adjustable IC to produce the wished frequency which VCO provides through loop filter. It has internal counter using 21.25MHz reference frequency to make 6.25KHz as reference Signal. VCO frequency from prescaled input is divided signal is compared with Refer- ence signal phase in phase comparator.

  • Page 18: Transmitter

    Matching of filter satisfies pass bandwidth of filter, ripple elimination with in pass band, and attenuation characteristic of stop band. X-tal filter is composed of two pole monolithic X-tal filter, 8kHz of IF bandwidth R11 is used as impedance matching with 1'st IF Amp Q3. d) IF AMP and Detection 1'st IF AMP Q3 supplies IF(U12) mixer input pin16 through output resistor R13 and C21 to need gain in insertion loss of X-tal filter and last stage...

  • Page 19: Block Diagram

    6. BLOCK DIAGRAM...

  • Page 20: Schematic

    7. SCHEMATIC...

  • Page 24: Component Partlist

    8. COMPONENT PARTLIST Tectalk Revised: November 7, 2001 Tectalk.SCH Revision: ??? Bill Of Materials November 8, 2001 9:18:20 Page Item Quantity Reference Part ________________________________________________________________ C1,C12,C30,C42,C43,C63, C13,C14,C17,C19,C20,C21, 102 C23,C31,C52,C55,C64,C82, C83,C92,C112,C113,C127, C141,C147,C149,C154 C2,C41,C67,C78,C79,C89, 220P C91,C93,C94,C95,C109, C155,C163 C15,C44,C45,C46 C16,C36,C47,C48,C75 C18,C26,C28,C33,C34,C51, 104 C56,C57,C65,C115,C118, C121,C123,C125,C129,C134,...
  • Page 25 C84,C156 3.3/6T3 C86,C157 C101,C103,C107 22/4T OP1,C OPEN C105 100/6E3 C106 47/16E C124,C126,C128 C132,C177 C133 820P C152 C174 C220 220/6E3 CF450UG JJ7,CHARGER- D3,D6,D7,D10 KDS114 D5,D8 KDS160 SM-2333T,GRN MA2S372 KDS226 KDS120 SR-2333H,RED D25,D26 KDS184 XX3P 30mmX2 WIRE STERO 2 2X1 10n,(E2-320904T-R) L2,L11,L17 470n,(FI-B1608) 47n,(CI-B1608)
  • Page 26 L4,L12 270n,(FI-B1608) L5,L7,L8,L15 24n,(E2-281106T-R) L6,L18 28n,(E2-281106T-R) 22n,(CI-B1608) 39n,(CI-B1608) 31n,(E2-281106T-R) 8n2,(CI-B1608) LCD1 TTR3264DPFDHN MIC1 CMP4540 KTC4080 AT-31625 BFP193 Q1,Q2,Q7,Q8,Q10 BFQ67W Q19,Q23,Q27,Q28,Q29,Q31, KRC404 Q32,Q33 2SC4226 Q21,Q24,Q26 KRA306 KTA2015 KRA305 Q30,Q35 KRA304 KRC409 R3,R53,R101,R102 R1,R4,R21,R43,R45,R49, R106,R107,R108,R141 R7,R20,R26,R33 R8,R10,R40 R2,R5,R15,R19,R24,R30, R31,R32,R34,R35,R38,R41, R52,R105,R112,R114,R126, R127,R128,R129,R131,R132, R152,R155 R11,R44,R54 R13,R22,R148,R159 R14,R17...
  • Page 27 R16,R48 R18,R123,R125 470K R23,R29,R111,R122,R143, 100K R147,R151,R154,R160,R174 R25,R37 R47,R55 R12,R103 330K R104 390K R109,R156 R120 120,0.5W R121,R136 R124 R135 R153 R158 R171 R172 270K R173 SF1,SF2 446M SPK1 36-16BB-08 SW1,SW2 KQT901 HD40488-12B28TE(V4) CMX808A R1120N401B NJM386 AK93C45AV-L NJM2072M NJM324V...
  • Page 28 R1120N331B TB31202FN DBL5018V 10PM 10KM 4MHz 21.25MHz MF21.7M3...

  • Page 29: Assembly Drawing And Photograph

    9. ASSEMBLY DRAWING AND PHOTOGRAPH...

  • Page 30: Channel Data (With Sub-Channel Data)

    10. CHANNEL DATA (With Sub-channel data) TX FREQ (MHz) 446.00625 446.01875 446.03125 446.04375 446.05625 446.06875 446.08125 446.09375...
  • Page 31 192.8 Hz 100.0 Hz 203.5 Hz 103.5 Hz 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 November 2001 www.albrecht-online.de/service...

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