Tectalk(FM) SERVICE MANUAL
Contents
1. 22 CRN D21 522 SR 2333H VZ er saro d no R102 R119 XXX co EN gt ES XXX as vee hull eres Ss YES ozz A me _ 032 xxx A Es krasoe 309 t EN B Fie I x I Riis xxx us BH si 1 a DU E F Poi ns 2202 sss a 1 220 ZAT L 104 10 R EER ERT PP EE la ere eoss E E R D b vec FE 1 azo B iz E EEE ie ke appr KRASO4 au Es 2296 32 285 o je v 2 Ji jo 5 B 7 la 521 XT c66 LY 88 8555555555353 pt RAL n 2 889265521 cie2 ak SKI py sss vec o avec 455524 520 80 105 ps XXX Se IR LL ELL 330K Lou er Im lol a_i sis 58 i sz i a2 10 us ERN BFeezu _Br eru 815 m I as 514 54 sis 85 UE TEST HD4048899A 22TE R53 512 osci RS2 S11 ALT Eo v Li oscz RS17510 si io GND Rs0 s9 42 SC2. C 7 Spurious Response Rejection gt 65dB 8 Audio output 200mW 8 Ohms load THD 10 9 Distortion 5 1kHz 6096 Modulation 0 RX Audio Response 6dB OCT 1 10dB deemphasis 300Hz 2 5kHz 1 S N Ratio 40dB 1kHz 6096 Modulation 2 IF 1 st IF 21 7MHz 2 nd IF 450kHz 13 Local Frequency 1 st Local Frequency fc 21 7MHz 2 nd Local Frequency 21 25MHz c FM Broadcast Radio 1 Receive Method Heterodyne 2 Receive Sensitivity Min 90dBm 12dB SINAD 3 Local Frequency 1 st Local Frequency fc 75KHz 3 OPERATION 3 1 Drawings of the radio FUNCTIONS CONTROLS Battery Door Monitor Button Detachable Belt Clip Push To Talk PTT Button External MIC Speaker Built in Speaker LCD Panel Built in Microphone 10 UP Button amp Volume Control 11 DOWN Button amp Volume Control 12 Function Button 13 Power On Off amp Enter Button 3 2 ICONS LCD WV iul AN E L1 EN 23 SI E wi 1 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 3 CTCSS Indicator Blinks when the correct CTCSS tone is entered 4 Auto Channel Scan Indicator Appears in the normal scan mode or when
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4. CE wo 1 ef mam J D mes mre seem 1 armen cover Jack DD verwe sem jew a 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 CTCSS Continuous Tone Coded Squelch System Frequency List Sub Channel posee cc EL LE 9 Hz 74 4 Hz 77 0 Hz 79 7 Hz 82 5 Hz 85 4 Hz 88 5 Hz 91 5 Hz 94 8 Hz _ _ 97 4 Hz k N 100 0 Hz 103 5 2 gt 107 2 Hz 110 9 Hz D 114 8 Hz NI 118 8 Hz 123 0 Hz 127 3 Hz N ALAN Electronics GmbH Nov 2001 www albrecht online de Service Hotline 49 4154 849 180 e mail service albrecht online de 131 8 Hz Tone Frequency Sub Channel Tone Frequency I 5 Hz NE _ 3 Hz 146 2 Hz 151 4 Hz 156 7 Hz 162 2 Hz 167 9 Hz 173 8 Hz 179 9 Hz 186 2 Hz 192 8 Hz 203 5 Hz 210 7 Hz 218 1 Hz 225 7 Hz 233 6 Hz 241 8 Hz 250 3 Hz
5. 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 amp 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 Power key is on condition but does not work Battery could completely discharge Battery cell twist Touch problem come between Battery and Radio 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 IC U7 problem Tx is set when switch is on Tx switch problem 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 SF1 saw filter fail VCO problem Squelch does not work U12 problem Control logic problem 5 DESCRIPTION OF RADIO CIRCUIT 5 1 Frequency synthesizer Frequency synthesizer consists of VCO PLL IC
6. built in PRESCALER and loop filter a VCO VCO is composed of ONE VCO Oscillation circuit takes colpitts circuit using variable Diode And VCO is composed of D1 Q8 Q9 C81 C75 VC1 L11 C74 C76 VCO control voltage 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 in phase comparator Built in charger pump changes voltage until two signals are in phase and charged voltage supplies VCO through loop filter to produce the desired frequency Frequency data associated with channel goes to PLL IC by CPU through CLOCK DATA PLL IC enables by strobe line of CPU c Loop Filter Loop filter is composed of R48 R49 C84 C85 and changes pulse from pin14 to DC and eliminates harmonic component in pulse It helps VCO oscillate clearly as DC voltage is supplied into Varicap 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 25 2 a Rx Tx Conversion Circuit Rx signal goes to Rx Tx conversion circ
7. 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 Battery Level Indicator Battery Level Meter indicates the remaining battery strength 10 Tx Indicator Appears when a signal is being transmitted 11 Rx Indicator Appears when a signal is being received ID me N ER Sa 1 Tm I sr f Yull NA HO SA 12 Large Segment Display p Indicates the channel number in use at the J normal mode When the Function Button is pressed it Displays the function menu sequence Vano Ch rdo Sc Uo Sub CAL rog tAL 1 2 3 P1 P2 PA P5 13 Small Segment Display Up 1 Displays the frequency at the Vt Displays the SUBMENU of each MENU in the function E al al 13 1 Main Menu CH 1 8 0 38 ctcss channel rdo OFF ONLY PLUS SC nr Pr 1 8 OFF VO Hi nr Lo OFF 1 2 3 5 sec Vox Delay Time HOO 00 99 00 99 13 2 Sub Menu Sub
8. yES NO CAL 1 7 OFF bEP On OFF rog On OFF tAL 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 amp 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 this button allows you to shift to next preset FM radio Broadcasting 2 Long Touch Power Off Press this button 13 for longer than 1 5 seconds to turn the unit off A momentary press of this button is also used to shift to the other small segment display during the function edit mode and reset the stopwatch counter in the stopwatch mode 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 3 3 3 UP BUTTON 10 1 Short Touch Inthe standby mode press this button briefly to move to the next higher main volume level n the function edit mode press briefly to shift from the current option in each submenu to the next option in the same submenu
9. 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 through different menus in the function edit mode 3 3 4 DOWN BUTTON 11 1 Short Touch n 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 than 1 5 seconds will allow you to navigate at a more rapid rate through different volume level in the standby mode or through different menus in the function edit mode 3 3 5 PUSH TO TALK PTT BUTTON 4 Press it firmly and speak into the Built in Microphone 9 to transmit The red Tx LED Indicator at the right side of the LCD Panel 8 will light Release it to revert to standby mode When an incoming call is received the green Rx LED Indicator on the left side of the LCD Panel 8 will light 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 3 3 6 MONITOR BUTTON 2 Press it to check activity on the current channel before you try to transmit Adjust the
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11. ALAN Mibrecht Albrecht Tectalk FM SERVICE MANUAL 2 WAY PORTABLE PMR 446 RADIO WITH FM BROADCAST RECEIVER Nov 07 2001 ALAN Electronics GmbH 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 4 5 Receiver Test 4 6 Symptoms check point amp 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 1 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 1 2 CHARACTERISTIC a All active device in this radio is composed of semiconductor and high density IC b To design this radio in compact and weight approximately 130g including battery C CPU of this equipment is HD404889 from HITACHI d You can use PMR 446 and FM Radio with this unit at the same time It S power can operat
12. E3 332 CF450UG KDV154E KDS114 MCL4148 KDS122 KDS120 SR 2333H RED SM 2233T GRN LS4148 KDS184 KDV1472 30mmX2 WIRE STERO 2 2X1 10n E2 320904T R 270n CI B1608 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 33 L202 L206 L3 47n CI B1608 L5 L7 L8 L15 24n E2 281106T R L6 L18 28n E2 321306T R L10 39n CI B1608 L13 31n E2 281106T R L16 8n2 CI B1608 L201 56n CI B1608 L203 1n8 CI B1608 L205 100n CI B1608 LCDI OTC 2035 MICI CMP4540 Q1 Q2 Q7 Q8 Q10 Q202 BFQ67W Q3 Q201 2SC4083 Q4 DRF1601 Q5 BFP193 Q9 2SC4226 Q19 Q23 Q27 Q29 Q31 Q32 KRC404 Q205 Q22 KTA2015 Q24 Q203 KRA306 Q25 Q26 KRA305 Q30 KRA304 Q204 KTC4075 R1 R4 R35 R38 R54 R106 R107 R108 R141 R159 R216 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 R7 R20 R26 R33 R203 R301 1K R9 3K3 R11 R36 470 R12 R103 R209 330K R13 R22 R148 R201 2K2 R16 R43 R48 R113 R202 47 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 R18 R21 R135 R25 R37 R3 R53 R101 R102 R208 R214 R23 R29 R111 R143 R147 R151
13. FM selection mode FM icon FJ appears on LCD Panel 8 And you can choose the channel by pressing the Up Button 10 and the Down Button 11 4 When the FM only or FM plus is selected on the FM selection you can select the way of channel selection in seek scan and tune scan by pressing the Enter Button 13 5 If you select seek scan you can select the FM radio channel by carrier detect way and if you select tune scan you can select the FM radio channel 3 4 3 CHANNEL SCAN MODE 1 NORMAL SCAN MODE 2 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 Press the Monitor Button 2 to confirm your selection The unit will begin scanning for an active main channel If a transmission is detected the Rx and RSSI icons will appear in the LCD Panel 8 To turn off the auto channel scan feature return to the Scan mode by pressing the Function Button 12 and choose OFF You can pause on any channel while in the Auto Channel Scan Mode by pressing the the PTT Button 4 during the reception of a signal for 5 seconds afterward Pressing the Monitor Button 2 will resume scanning and elimi nate that channel from those being scanned P
14. Function Button 12 until the word HOO appears on the LCD Panel 8 Press the Up Button 11 to start and stop the counter up while the stopwatch is running pressing the Down Button 11 allows you to obtain the lap time Press the Power Enter Button 13 to reset the stopwatch time Press the Function Button 12 to turn off the stopwatch function 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 Pressing the Function Button 12 when no blinks returns to standby Access to following SUB Menu points is only possible when You have avtivated the SUB menu by setting to Yes 1 CALL RINGER MELODY SELECTION MODE This feature provides 7 user selectable call ringer melodies to alert you of a calling party To select your favorite Call Ringer melody In the Sub option selection mode press the Function Button 12 when the yes blinks Press the Down Button 11 or Up Button 10 to preview the seven available melodies Press the Monitor Button 2 to confirm your selection 2 BEEP TONE SELECTION MODE This feature allows you to program beeping or not beeping with key selection If the Key beep off is chosen
15. R pe R43 58 9 MOPTL E v err R42 RAT rn Im 532 S38 512 cos RESET R41 S6 93 vec Rao ss as mon ges RESO Ka ha T o7 R33 54 R12 HIHI DI R32 53 43 DAT E 330K KDS114 02 R31 s2 ea e R30 51 81 R24 PES Ria mea las 222222250855585313122223 10K 262 228988381833238123615 8 E L xe o nn xri Le LES KERREERFEFEFFEEEEEFEEE s ro M ci E ae 13 ore Dr 5 P P 3 2 CF450UG ci M WETEN gt HIC lt 220 T n c sk 2 Al 220 663 033 lente A TU EXON vee cs TU CES OR 25 PHRHLD ARSITISAVI Di F140 183 183 Lio PHREN SHORT OPEN ESS vex L205 Short EMO i6ap 7 za 36 1688 08 Lans e Lys SH A 4 8 E esos HI E 2 ezoz ane 2 WIRE i R22 594 152 czoa TA 0201 Me 229 C3 100K TOK R213 100P E eil 18 323 1 Ess zz 2 iu 12049 R214 msoz 14 cale 338 numszav F55 a B P 2 i ce vec E 0202 am i SOS TR 183 RISI RISI L 104 pir Rosse Rise i K 10K Piss cioSTRise 22K lszoP 220P 10K i AS Fia STE 1 102 ad Fio uie 2 192 TEK us ETL leo 1041 Axo vec L IN voc ovcc Lu Xi vor
16. R154 R160 R161 R174 R39 R40 R41 R212 R49 R55 R213 R56 R171 R59 R302 R303 R60 R121 R136 R104 R109 R122 R156 R120 R123 R125 R124 R153 R158 R163 R172 R173 R217 SF1 SF2 SPK1 SW1 SW2 T1 TH1 U1 U2 U3 U4 560K 12K 220 330 100K 22 100 5K1 3K9 10 15K 0 22K 390K 1M 120 0 5W 470K 7K5 68K 2K7 220K 270K 33K 120K 446M 36 16BB 08 PM1188 T13 221 HD4048899A 22TE CMX808A R1120N401B NJM386 121 122 123 124 125 126 127 128 129 130 131 132 133 05 U6 U7 U8 U11 U12 U201 VCI VC2 VR1 X1 X2 1 AK93C45AV L NJM2072M NJM324V R1120N331B TB31202FN DBL5018V TDA7021T 3PM 10PM 10KM 4MHz 21 25MHz MF21 7M3 9 EXPLODED VIEW Law sree puren enncness 1 29 rms coven meas wma rase ume 1 m memes sm mrimmamaan 2 veces emmacr rm Jef nern im oan 1 s near sm ZI fe mews omm m 1 a rm Foreste 1 eo remesa sem sms KNB PTT Hm Back 1 1 rica amer mamme 1 pe ss zoa BiHNG WE some 1 34 msome summ 1 omasa
17. RIORITY SCAN MODE This feature allows you to monitor 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 the PTT Button 4 is pressed during or immediately following the reception of secondary channel transmission The power saver mode is disabled in the Priority channel scan mode and the volume is not adjustable To access the Priority channel scan mode Press the Function Button 12 until the word SC appears in the LCD Panel 8 Press the Up Button 10 or the Down Button 11 to choose Pr and then press the Shift Button 13 Choose the priority channel by pressing Up Button 10 and Down Button 11 to select the desired channel number you wish to closely monitor Press the Monitor Button 2 to confirm your selection To turn off the Priority channel scan feature press the Function Button 12 until the word SC appears on the LCD Panel 8 and then choose OFF in the scan mode 3 4 4 VOX amp VOX RECOVERY TIME SELECTION MODE 1 VOX SELECTION MODE The Voice Activated Transmission VOX function allows your voice to activate transmission automatically
18. T ANT 2 3 B1 B2 B3 HH 1M2012 121 3 1 C9 5P 4 8 C12 C16 C36 C47 C48 C75 10 C211 C212 5 31 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 6 2 C15 C45 6P 7 9 C22 C27 C35 C50 C61 C66 10 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 C38 C209 C210 56PU 14 1 C39 33P 15 2 C43 C46 7 16 3 C49 C63 C71 2P 17 3 C53 C59 C206 15P 18 1 C54 12P 19 1 C OPEN 20 12 C60 C82 C89 C91 C93 C94 220P C95 C109 C155 C163 C167 C170 21 3 C62 C68 C231 1P 22 2 C69 C72 8PU 23 24 25 26 27 28 29 30 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 C73 C205 C74 C76 C84 C156 C202 C85 C201 C86 C157 C101 C103 C107 C105 C106 C124 C126 C128 C132 C133 C233 C152 C177 C174 C226 C204 C219 C220 C222 CF1 D1 D3 D6 D7 D10 D202 D4 D5 D8 D9 D11 D21 D22 D25 D26 D201 E7 H1 J1 4 L1 L2 L4 L9 L11 L12 L17 3P 1P5 2P4 224 3 3 10T 223 22 4T 100 6 47 16 22 393 820P 473 472 47 152 220 6
19. 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 f you press and hold the monitor button for more than 3 seconds the monitor appears on the LCD panel and monitor the receiving signal continuously To stop the monitoring press the Monitor Button 2 and return to the standby mode Press it to confirm the required option 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 other PMR units both you and the receiving party must be on the same channel Tectalk FM has 8 channels 1 8 as indicated by the large digits in the LCD Display Panel 8 Before trying to transmit on the selected channel you should press the Monitor Button 2 to check the activity on that channel lf someone is already on the selected channel you should try another channel that is clear To change the basic channel In the standby mode press the Up Button 10 briefly to move to the next higher main channel number Press the Down Button 11 briefly to
20. an preset the frequencies and sub codes you use frequently Max 3 memory channels are possible To access the Preset selection Mode Press the Function Button 12 from the Roger selection Mode Press the Up Button 10 or Down Button 11 to preset the channel Press the Power amp 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 to select beween maximum 5 preset radio stations simply by pressing the function button F in the receive mode subsequently Display shows P 1 to P5 If You have not yet preset Your desired radio stations enter the SUB Menu first Select memory location P1 to P5 and select the frequencies with up and down buttons W or A Confirm each setting with the memory button M 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 amp GND in digital volt meter C Then set the low channel of Tectalk FM the lowest frequency d After pressed PTT key of Tectalk FM trim VC1 for adjusting the lowest frequency of Tx channel to DC 1 5V in the voltage of TP1 e Afte
21. e 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 Modulation Type 8K50F3E d Communication Mode Simplex e Channel Capacity 8 channel f Channel spacing 12 5 KHz g Power 6 0V Alkaline h Battery Life Alcaline 1000mAh gt about 35hours NI MH 600mAh gt about 22hours Tx5 Rx5 Stand by 90 i Operating Temperature 20 C to 55 C j Dimension 95 5 H x 50 W x 26 D mm k Weight 130g with Battery 2 2 ELECTRICAL SPECIFICATION a TRANSMITTER 1 Output power Max 0 5 W 2 Frequency Stability 5 ppm 20 C to 55 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 lt 36dBm 8 FM Hum Noise gt 40dB 1kHz 6096 modulation 9 Distortion 5 1kHz 6096 modulation 10 Tx Audio Response 6dB OCT 3dB preemphasis 300Hz to 2 5kHz b RECEIVER 1 Receive Method Double Super Heterodyne 2 Receive Sensitivity 118dBm up 20dB SINAD W CCITT 3 Squelch Sensitivity 120dBm to 130dBm AUDIO On Off Point 4 Bandwidth gt 8 5KHz 5 Selectivity 55dB 6 Local Frequency Stability 5ppm 20 C to 55
22. eeps noise and audio from entering to VCO at time of Tx Audio modulation and Audio Amplification has characteristic of 6dB OCT pre emphasis by U7 NJM324V 6 BLOCK DIAGRAM EAF igus m SQUELCH LEVEL CHANGE SISE DETE SFI XFL 1 42 X 1 C174 R172 RONT END uaoz ame I o T FEZI PARE DESEHFH Uir PLL cri Ti uzo gt ezol FM RECEIVER vco x FozasUKHz LPF 204 0205 BUSY DETECT RI 172 uzo cress RATX SU 5 ISCRAMBLER 7 010 06 08 x2 BUFFER 21 25MHz AMP vco ure T i 019 029 HOD 4 GAIN CONTROL LFF R EHPH ETS LCD1 e209 XI EXT PTT 204 ue 0204 he MEMORY DISPLAY BACK LIGHT az L 1 i T 022 023 va t BAT J us 9
23. move to the next lower main channel number Press the Monitor Button 2 to return to standby mode 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 This helps to avoid congestion on the main channel and filters out unwanted noise and static There are 38 CTCSS sub channels for each main channel To change the CTCSS sub channel press the Function Button 12 until the word Ch appears in the LCD Panel 8 Press the Shift Button 13 and the two small number on the right side will blink on the LCD Panel 8 Press the Down Button 11 or the Up Button 10 to choose the desired sub channel to use The corresponding sub code frequency will be displayed in the lower 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 plus You can receive the FRS signal even while you listen to the FM Radio 3 When the FM only or FM plus is selected on the
24. 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 confirm your selection and return to standby mode When you press Enter button 13 or do not press any key within 5 seconds it returns back to stand by 3 ROGER BEEP SELECTION MODE If Roger Beep option is on when you finish the transmitting auto matically the TECTALK FM will produce a beep sound and transmit sub code tone to the partner To access the Roger Selection Mode Press the Function Button 12 from the Key beep selection mode Press the Up Button 10 or Down Button 11 to select from Roger on or off Press the monitor Button 2 to confirm your selection and return to standby mode 4 SQUELCH TAIL SELECTION MODE This feature allows you to set option mode of CTCSS squelch tail elimination 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 5 PMR MEMORY CHANNELS SELECTION MODE This feature allows you to preset the frequency and sub code You c
25. r 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 amp measure equipment according to block diagram below MODULATION METER POWER SUPPLY OSCILLOSCOPE DUMMY LOAD POWER METER DISTORTION METER SPECTRUM ANALYZER AF OSCILLATOR FREQUENCY COUNTER b Connect DC 6 0V voltage preset to EUT c Connect Power Meter amp dummy load 50 Ohms internal connection points 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 1 2 and adjust AF level should be 60mV 9 Checking oscilloscope and modulation meter max Frequency deviation should be in 2 2 KHz 4 3TRANSMITTER TEST Output Power Test Power 6 0V DC should be Max 500mW and in 2096 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 Check the audio level for 300Hz 3kHz based on frequency standard 1kHz c Modulation Degree Test 1 Connect AF oscillator to the MIC terminal and then adjust the level to 60 2 Measure the oscilloscope wave and he point needle of modulation meter after pressing PTT key 3 Sweep gradually the frequency of AF oscilloscope from 300Hz to 3kHz 4 At thi
26. s 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 7Vrms 8 Ohms load after power b Connection method 8 OHMS LOAD OSCILLOSCOPE DISTORTION METER SINAD METER POWER SUPPLY Setting 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 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 47dBm 2 Adjust to 0 7Vrms 8 Ohms load seeing Audio wave 3 Read the needle of distortion meter normal condition would be less than 5 distortion b Rx sensitivity test SSG should be adjusted to 20dB of SINAD s point needle seeing wave of oscilloscope as SSG sets in 1kHz with 1 5KHz frequency deviation At this time normal RF level is 118dBm c Squelch
27. se IF IC makes up of mixer IF AMP pin1 2 nd local frequency enter to pin 1 It supplies mixer of internal IC Mixer output of IC through pin3 passes 450kHz ceramic filter supplies 2 nd IF amplifier and limits After 2 nd IF AMP has a process of enough gain and AM rejection it comes to quadrature detection Demodulated audio signal by T1 Quad Coil is amplified and comes out to pin9 Detected audio signal through R22 VR1 and input in audio amp IC U4 through C22 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 5 3 Transmitter When Tx develops with pressing PTT switch VCO output amplifies through Q4 Q5 transmits by antenna through low pass filter Tx RF signal produced 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 U7 It enters to VCO through low pass filter and U2 Max Frequency modulation deviation is adjusted by VR1 k
28. uit through FIXED antenna connector low pass filter L5 L6 L7 C42 C43 C46 C47 and receiver resonance circuit composed of L8 C1 When transmitting voltage through R25 L12 D6 supplies D7 of receive input is short and Tx is on condition When PIN diode is off in condition of Rx L8 and C1 resonate serially and make impedance matching at receiver bandpass filter SF1 b Front End Front End has Q1 to provide a high sensitivity and low noise feature It employs SAW filter as band pass filter to eliminate image frequency and to produce enough pass band by Q1 input and output c Mixer Mixer has one base BFQ 67W Q2 to feature high low noise quality It has RF signal through L7 L8 SF1 and Q1 RF signal from Local oscillator mixed It develops 1 st IF 21 7MHz 1 st IF goes to 1 st IF amplifier 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 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 supplies IF 012 mixer input pin16 through output resistor R13 and C21 to need gain in insertion loss of X tal filter and last stage circuit Multi u
29. 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 To access the VOX Selection menu Press the Function Button 12 until the word UO appears in the LCD Panel 8 Press the Down Button 11 or the Up Button 10 to select from Hi nr Lo or OFF The High normal or low setting determines VOX response sensiti vity Press the Monitor Button 2 to confirm your selection To turn off the VOX feature enter the VOX selection mode and then select OFF 2 VOX RECOVERY TIME SELECTION MODE This allows the response characteristics of the VOX function to be precisely 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 transmitting and receiving Press the Monitor Button 2 to confirm your selection Please note you may need to try different VOX time settings to determine the best value to suit your speaking habit 3 4 5 STOPWATCH MODE In this mode you can use the stopwatch to time To access the Stopwatch mode Press the
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