ALAN Electronics Tectalk FM PMR 446 Service Manual Download | Manualshive

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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 & Volume Control
11) DOWN Button & Volume Control

12) Function Button
13) Power On/Off & Enter Button

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Summary of Contents for 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: ...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 Correction 5 DESCRIPTION OF RADIO CIRCUIT 5 1 Frequency Synthesizer 5 2 Receiver 5 3 Transmitter 6 BLOCK DIAGRAM 7 SCHEMATIC DIAGRAM 8 COMPONENT PART LIST 9 EXPLODED VIEW 10 CHANNEL DATA With Sub Channel data ...

Page 3: ...quipment is HD404889 from HITACHI d You can use PMR 446 and FM Radio with this unit at the same time e It s power can operate by use of ALCALINE 4 cell 1 5V AAA battery 1 3 COMPOSITION This radio is composed of following a Transmitter W Antenna b Belt clip 2 SPECIFICATION 2 1 GENERAL SPECIFICATIONS a Frequency Range 446 00625 to 446 09375 MHz b Output Impedance 50 Ohms internal unbalanced c Modula...

Page 4: ...dyne 2 Receive Sensitivity 118dBm up 20dB SINAD W CCITT 3 Squelch Sensitivity 120dBm to 130dBm AUDIO On Off Point 4 Bandwidth 8 5KHz 5 Selectivity 55dB 6 Local Frequency Stability 5ppm 20 C to 55 C 7 Spurious Response Rejection 65dB 8 Audio output 200mW 8 Ohms load THD 10 9 Distortion 5 1kHz 60 Modulation 10 RX Audio Response 6dB OCT 1 10dB deemphasis 300Hz 2 5kHz 11 S N Ratio 40dB 1kHz 60 Modulat...

Page 5: ...tery 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 Volume Control 11 DOWN Button Volume Control 12 Function Button 13 Power On Off Enter Button ...

Page 6: ...al scan mode or when the normal scan mode is activated 5 Priority Scan Indicator Appears in priority scan mode or when the priority scan mode is activated 6 VOX Indicator Blinks in VOX selection mode or appears when VOX is activated 7 Key Lock Indicator Blinks in auto lock selection mode or when the key lock is activated 8 FM RADIO Mode Indicator This icon appears when the FM RADIO is selected 9 B...

Page 7: ... On OFF 1 2 3 1 8 1 38 P1 P2 P3 P4 P5 87 5 108 3 3 Key Functions 3 3 1 POWER ON OFF SHIFT BUTTON 13 1 Short Touch Power On a When FM RADIO is OFF Press this button 13 briefly to turn the unit on A short confirming melody will play A momentary press of this button is not effected to any function in the Function edit mode and stand by mode except in the speci fic mode b When FM radio is on Pressing ...

Page 8: ...different volume level in the standby mode or through different menus in the function edit mode 3 3 4 DOWN BUTTON 11 1 Short Touch In the standby mode press this button briefly to move to the previous lower main volume level In the function edit mode press briefly to shift from the current option in each submenu to the previous option in the same submenu 2 Long Touch Pressing this button for more ...

Page 9: ...n for respective functions during function edit mode 3 3 7 EXTERNAL MIC SPEAKER 6 This jack accepts an optional headset microphone for handsfree operation Please refer to the Albrecht catalogue or homepage to see the variety of available accessories See also section regarding VOX SELECTION MODE 3 4 Setting and Operation 3 4 1 CHANNEL SELECTION 1 BASIC CHANNEL SELECTION In order to communicate with...

Page 10: ...wer right corner Press the Monitor Button 2 to confirm your selection and return to standby mode NOTE To communicate with other PMR units they must be switched to the same channel and CTCSS sub code To communicate with other PMR units that do not have sub codes switch your unit to the same channel with the sub code set to OFF 3 4 2 FM RADIO Mode 1 FM Only You can receive the FM Radio only 2 FM plu...

Page 11: ...itor two different channels at the same time If you pre set any priority channel other than the current chan nel in use the pre set channel will be scanned every 0 5 second and signals you when a call is received While in the Priority Channel Scan Mode you may hear transmission from either a primary or secondary channel when transmitting The unit will always transmit on the primary channel unless ...

Page 12: ...ly adjusted to suit individual needs To access the VOX Recovery Time Selection menu Press the Function Button 12 until the word UO appears in the LCD Panel 8 Press the Power Shift Button 13 to confirm your selection and switch to VOX recovery time selection Press the Down Button 11 or the Up Button 10 to select from 5 3 2 or 1 second setting This setting determines the delay time between transmitt...

Page 13: ...TION MODE This feature allows you to program beeping or not beeping with key selection If the Key beep off is chosen no beep sound when you press the button The call signal power on off beep and roger beep make a sound regardless of the beep Press the Function Button 12 from the Call selection mode Press the Up Button 10 or Down Button 11 to select from on or off Press the Monitor Button 2 to conf...

Page 14: ... the Roger selection Mode Press the Up Button 10 or Down Button 11 to preset the channel Press the Power Shift Button 13 to shift into CTCSS code selection option Press the Up Button 10 or Down Button 11 to preset the CTCSS code desired Press the Monitor Button 2 to return to stand by mode 6 FM Broadcast Radio Preset 1 to 5 If Your Tectalk FM is programmed to listen to FM broadcast it is possible ...

Page 15: ...e voltage of TP1 e After releasing the PTT key And then check if the highest frequency of Rx channel is within DC 2 0V in the voltage of TP1 4 2 TRANSMITTER a Connect EUT measure equipment according to block diagram below b Connect DC 6 0V voltage preset to EUT c Connect Power Meter dummy load 50 Ohms internal connection points d Adjust Tx frequency according to trimming trimmer VC2 e Connect AF o...

Page 16: ...the frequency of AF oscilloscope from 300Hz to 3kHz 4 At this time the point needle of modulation meter should be in 2 5KHz d Spectrum Test 1 Antenna is 50 Ohms internally and attenuator degree should be 20dB more 2 Observe the spectrum with pressing PTT key The harmonics should be less 36 30dBm than carrier 4 RECEIVER a Preparation 1 Adjust the power supply to DC 6 0V 2 Adjust Voltage level to 0 ...

Page 17: ...quelch Test After RF level of SSG should be set to the least level RF level should be gradually increased until speaker makes audio sound At this point check RF level Check Audio on 120dBm Audio off 130dBm 4 6 Symptoms Check point Correction a Diagnose method 1 Check each switch to work well 2 Check voltage of battery 3 Problem develops from transmitter or receiver b Troubleshooting 1 Transmitter ...

Page 18: ...ge through loop filter adjusts frequency and Microphone signal through Modulation terminal makes modulation 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 Reference signal phase ...

Page 19: ...1 RF signal from Local oscillator mixed It develops 1 st IF 21 7MHz 1 st IF goes to 1 st IF amplifier Q3 KTC4080 base through X tal filter XF1 IF of mixing signals is selected and taken into X tal filter Output impedance of mixer is direct matched with input impedance of X tal filter Matching of filter satisfies pass bandwidth of filter ripple elimination with in pass band and attenuation characte...

Page 20: ... from Tx VCO is amplified by DRIVER Q5 through C53 and entered Q4 POWER TR input terminal with final amplification After this stage the signal is emitted at antenna through 50 Ohms matching circuit to low pass filter L7 L6 L5 C42 C43 C44 C46 C47 to eliminate harmonic 5 3 1 Audio Modulation and Audio Amplification Audio signal produced by external or internal microphone limits amplification by IC U...

Page 21: ...6 BLOCK DIAGRAM ...

Page 22: ...7 SCHEMATIC DIAGRAM ...

Page 23: ......

Page 24: ......

Page 25: ......

Page 26: ......

Page 27: ... C149 C154 C203 C207 C213 C215 C224 C225 C228 C230 6 2 C15 C45 6P 7 9 C22 C27 C35 C50 C61 C66 1u C122 C142 C214 8 34 C25 C26 C28 C33 C34 C51 104 C56 C57 C65 C112 C115 C118 C121 C123 C125 C129 C134 C140 C145 C146 C148 C159 C164 C169 C171 C172 C173 C175 C217 C218 C221 C223 C227 C234 9 4 C29 C78 C208 C229 100P 10 5 C30 C40 C42 C44 C81 4P 11 7 C32 C114 C131 C143 C153 103 C162 C216 12 1 C37 27P 13 3 C3...

Page 28: ...2 C152 C177 473 36 2 C174 C226 472 37 1 C204 47P 38 1 C219 152 39 1 C220 220 6E3 40 1 C222 332 41 1 CF1 CF450UG 42 1 D1 KDV154E 43 5 D3 D6 D7 D10 D202 KDS114 44 3 D4 D5 D8 MCL4148 45 1 D9 KDS122 46 1 D11 KDS120 47 1 D21 SR 2333H RED 48 1 D22 SM 2233T GRN 49 1 D25 LS4148 50 1 D26 KDS184 51 1 D201 KDV1472 52 1 E7 XX3P 53 1 H1 30mmX2 WIRE 54 1 J1 STERO 55 1 J4 2 2X1 56 1 L1 10n E2 320904T R 57 8 L2 L...

Page 29: ... DRF1601 72 1 Q5 BFP193 73 1 Q9 2SC4226 74 7 Q19 Q23 Q27 Q29 Q31 Q32 KRC404 Q205 75 1 Q22 KTA2015 76 2 Q24 Q203 KRA306 77 2 Q25 Q26 KRA305 78 1 Q30 KRA304 79 1 Q204 KTC4075 80 11 R1 R4 R35 R38 R54 R106 4K7 R107 R108 R141 R159 R216 81 33 R2 R5 R15 R19 R24 R30 10K R31 R32 R34 R44 R45 R52 R105 R112 R114 R115 R116 R126 R127 R128 R129 R131 R132 R152 R167 R168 R204 R205 R206 R207 R210 R211 R215 82 6 R7 ...

Page 30: ...98 2 R56 R171 15K 99 3 R59 R302 R303 0 100 3 R60 R121 R136 22K 101 1 R104 390K 102 3 R109 R122 R156 1M 103 1 R120 120 0 5W 104 2 R123 R125 470K 105 1 R124 7K5 106 1 R153 68K 107 1 R158 2K7 108 1 R163 220K 109 1 R172 270K 110 1 R173 33K 111 1 R217 120K 112 2 SF1 SF2 446M 113 1 SPK1 36 16BB 08 114 2 SW1 SW2 PM1188 115 1 T1 T13 116 1 TH1 221 117 1 U1 HD4048899A 22TE 118 1 U2 CMX808A 119 1 U3 R1120N40...

Page 31: ...45AV L 122 1 U6 NJM2072M 123 1 U7 NJM324V 124 1 U8 R1120N331B 125 1 U11 TB31202FN 126 1 U12 DBL5018V 127 1 U201 TDA7021T 128 1 VC1 3PM 129 1 VC2 10PM 130 1 VR1 10KM 131 1 X1 4MHz 132 1 X2 21 25MHz 133 1 XF1 MF21 7M3 ...

Page 32: ...9 EXPLODED VIEW ...

Page 33: ...10 CHANNEL LIST Channel Frequency MHz 1 446 00625 2 446 01875 3 446 03125 4 446 04375 5 446 05625 6 446 06875 7 446 08125 8 446 09375 ...

Page 34: ...6 162 2 Hz 7 85 4 Hz 27 167 9 Hz 8 88 5 Hz 28 173 8 Hz 9 91 5 Hz 29 179 9 Hz 10 94 8 Hz 30 186 2 Hz 11 97 4 Hz 31 192 8 Hz 12 100 0 Hz 32 203 5 Hz 13 103 5 Hz 33 210 7 Hz 14 107 2 Hz 34 218 1 Hz 15 110 9 Hz 35 225 7 Hz 16 114 8 Hz 36 233 6 Hz 17 118 8 Hz 37 241 8 Hz 18 123 0 Hz 38 250 3 Hz 19 127 3 Hz 20 131 8 Hz ALAN Electronics GmbH Nov 2001 www albrecht online de Service Hotline 49 4154 849 180...

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