Hytera Transmitter User Manual
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Hytera Transmitter User Manual

Hytera Transmitter User Manual

Transmitter
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Contents
Revision History .....................................................................................................................................0
Introduction ............................................................................................................................................1
Radio Controls........................................................................................................................................2
Circuit Description .................................................................................................................................3
Description of Components ................................................................................................................20
Tuning....................................................................................................................................................22
Port Definition.......................................................................................................................................22
Troubleshooting Flow Chart................................................................................................................26
Disassembly and Re-assembly for Repair .........................................................................................31
Exploded View ......................................................................................................................................34
Packing..................................................................................................................................................36
MD78X PCB View..................................................................................................................................36
MD78X Block Diagram .........................................................................................................................36
Specifications .......................................................................................................................................37
Revision History
Material No.
Date of
Changes
Issue
May 2010
Initial Release

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Summary of Contents for Hytera Transmitter

  • Page 1: Table Of Contents

    Contents Revision History .............................0 Introduction ............................1 Radio Controls............................2 Circuit Description ..........................3 Description of Components ........................20 Tuning..............................22 Port Definition............................22 Troubleshooting Flow Chart........................26 Disassembly and Re-assembly for Repair ..................31 Exploded View ............................34 Packing..............................36 MD78X PCB View..........................36 MD78X Block Diagram .........................36 Specifications ............................37 Revision History Material No.

  • Page 2: Introduction

    The Hytera product described in this manual may include Hytera computer programs stored in memory or other media. Laws in the PRC and/or other countries or areas preserve for Hytera exclusive rights for Hytera computer programs. The purchase of this product shall not be deemed to grant, either directly or by implication, any rights to the purchaser with respect to Hytera computer programs.

  • Page 3: Radio Controls

    Radio Controls Front Panel Part Name Part Name Volume Control / Channel ○ ○ LED Indicator Selector Knob ○ ○ LCD Display OK/Menu Key ○ ○ Back Key Power On/Off Key ○ ○ Up Key Down Key ○ ○ Speaker Programmable Keys Emergency ○...

  • Page 4: Circuit Description

    Rear Panel Part Name Part Name ○ ○ Antenna Connector (BNC) Power Inlet ○ ○ Accessory Jack GPS Antenna Connector Circuit Description 1. Front Panel The front panel provides parts including speaker, keys, power switch, volume control knob, LCD display and etc.
  • Page 5 Figure 1 Front Panel Block Diagram 1.1 Power Supply The main board supplies power to the front panel via 5VD, so that RX/TX LED, backlight and USB devices can be powered up. Power is further fed to U5 LDO, and then is supplied to LCD and serial-to-parallel converter IC.
  • Page 6 memory chip select, LCD chip select and reset signal, and the signals will be pulled up by R36, R35, R34, R33 and R6 respectively. 5V voltage is converted to 3.3V by U5, and is then supplied to the LCD. 1.4 LED and Backlight LED enable signal is fed to the serial-to-parallel converter IC, and then is output by U302.
  • Page 7 2. Working Principle of Baseband Power System Figure 2 Diagram of Power Distribution Both the baseband control IC and the RF section can convert the supplied voltage to the appropriate level via the voltage conversion IC. RF section: U914, Q920 and Q921 supply power for the RF section. High current PNP transistor and comparator can function as LDO (Low Dropout Regulator).
  • Page 8 The mobile radio can be powered on/off through any of the following methods: Power On/Off key Ignition sense or Power On/Off key Emergency 2.1.1 Power On/Off key After the user presses the front panel Power On/Off key, R944 is grounded, and Q910 and Q905 are turned on, causing the power management IC U902 and Q920 to start working.
  • Page 9 Figure 3 Diagram of Clock Distribution 2.2.1 Input Clock 32K clock is used for timing and sleep of the whole system. Frequency of this clock is 32.768kHz, which is subject to frequency division without error by U302 to finally get 1Hz, usually used for counting seconds.
  • Page 10 of up to 9.6MHz, and the latter uses MCSI frame synchronization as chip select signal. MCSI1.DOUT as a data line is used to configure the memory U100. 2.3.3 MICROWIRE Interface Figure 6 MICROWIRE Interface Block Diagram The MICROWIRE interface can accommodate 4 external devices at most, and is generally used for receiving control and status messages from external devices, and can also be used for reading data from ROM.
  • Page 11 connected with TX end of McBSP2. U302 works in master mode. McBSP3 is connected to the Option Board interface for both voice and data transmission. 2.3.4 USB Interface Figure 8 USB Interface Block Diagram The radio has two USB interfaces, and both are connected to the USB signal port of the processor. REF CLOCK is the reference frequency in specified mode.
  • Page 12 Vbus USB power supply +5V power supply Ground GP5_3 general purpose I/O port General purpose I/O port with function defined (Chan_Act) through the CPS SW B+ sense power output 13V output voltage; output current ≤1.5A External Alarm Programmable output pin (the default is External Alarm) Power Ground Tx Audio input (audio from external...
  • Page 13 Figure 10 Block Diagram of Audio Path Connection 2.4.1 RX Audio Path U302 sends digital audio to the audio processor codec via the SSI bus of interface MCBSP1. The bus is composed of CLKX, FSX, DX and DR. It sends the demodulated PCM audio signal to codec, and adjusts the signal to appropriate amplitude according to the volume (RMS should be 80mv when frequency is 1k and deviation is 3k).
  • Page 14 3.1 UHF1 (400-470 MHz) Transmitter Circuit (5W-45W) The transmitter section includes power amplifier circuit and power control circuit. The PA circuit is used for signal amplification, so as to amplify VCO signal to the required output power level. The power...
  • Page 15 3.1.6 Antenna Switch The antenna switch is used to switch between the transmitter circuit and the receiver circuit. In TX mode, the switching transistor Q810 is controlled by TX signal, so as to supply 9V 3A to the PIN diodes D801 and D802.
  • Page 16 The forward power is coupled with the diode D803, and the voltage is applied to the power control circuit (U801). Then the output voltage VGG is applied to control the gate voltage of pre-driver and driver PA, for the purpose of stable power output.
  • Page 17 Figure 12 Block Diagram of Receiver 3.2.1 Front-end Circuit RF signals are fed into the low pass filter to remove signals above 550MHz, and are applied to the two-stage band pass filter to select the wanted signal. TV can realize 400-470M bandwidth adjustment. After passing through the BPF and LNA (Q6102), the RF signals together with the first local oscillator signal are fed into the mixer for the first time frequency conversion, to generate the first IF signal (73.35MHz).
  • Page 18 3.3 FGU 3.3.1 PLL Circuit The PLL circuit is used to supply excitation signal source for the transmitter, and to supply local oscillator signal for the receiver. It is composed of the reference crystal (X100), PLL IC (U100) and VCO.
  • Page 19 Q110) as the source of local oscillator signal for RX. U302 controls the operating frequency of the VCO. Q102 and Q107 constitute the buffer amplifier for the transmitter section, and Q111 and Q109 constitute the buffer amplifier for the receiver section. The Digital to Analog (D/A) converter (U500) outputs...
  • Page 20 TX_L_VCO Q103 TX PA Q107 Q102 Q100 TX_H_VCO PLL IC （U100） RX_L_VCO Q110 RX Lo Q109 Q111 Q106 RX_H_VCO Figure 15 Block Diagram of VCO System Test Plan To help you test every unit circuits, we have designed test points on the key parts of the circuit. Test of RF circuit is planned as follows: PLL/VCO Section Test...

  • Page 21: Description Of Components

    TP602 TP603 RF signal input TP604 LNA input TP605 LNA output TP606 LO input TP607 Mixer input TP608 Mixer output TP609 Crystal filter output TP610 AD9864 input TP611 Table 4 TX/RX Test Plan Description of Components 1. Main Board Part Ref No.
  • Page 22 U500 TLV5614IPW D/A converter Operational U6000 TA75S01F Amplifier U701 AD9864 10-300MH IF processor Power management U702 RP102N331B LDO Power management U703 XC6209F502PR LDO Operational U801 AD8566ARMZ 0.256 Amplifier Operational U802 TA75W01FU Amplifier Operational U803 TA75S01F Amplifier Power management U900 RP102N331B LDO Power management U901 RP102N331B LDO...

  • Page 23: Tuning

    -40℃-85℃ SOT89-5 PRTR5V0U2X ESD&EMI 5V -40~85 ℃ USB port protection SOT143B NXP device Tuning For details about radio tuning, please refer to the help file of DMR Tuner Software supplied by Hytera. Port Definition 1.1 Main Unit Pin No. Name Description...
  • Page 24 KB_C0 KB_C1 KB_C2 Matrix keyboard KB_C3 KB_R0 KB_R1 KB_R2 CSLED Backlight control IC chip select CLOCK Backlight control IC clock DATA Backlight control IC chip data OE_LCD LCD read enable WE_LCD LCD write enable CS2_LCD LCD chip select F_A1_LCD LCD memory select enable F_D7 F_D6 F_D5...
  • Page 25 RX Audio Analog output Used to output received audio signal. Spkr- Analog output External speaker output - D+ USB USB data + USB_GROUDN Ground line Digital General purpose I/O interface with GP5_2 input/output function defined through the CPS (the default is Monitor) ACC_IO2 Digital input Accessory identifier port;...
  • Page 26 00|01|10, and is off when the code is USB_D- / serial USB data USB data bus D- (compared with CPU port RX line/input pin inside the mobile radio) This pin together with MIC provides Ground line differential input. +5V, 500mA. 5V is output when accessory identification code is USB_VBUS Power supply...

  • Page 27: Troubleshooting Flow Chart

    DB10 DB11 DB12 DB13 DB14 DB15 DB16 DB17 RESET Reset signal Select data line LEDA LED positive LED_K1 LED_K2 LED negative LED_K3 Troubleshooting Flow Chart...
  • Page 28 Check control Power-up display RF circuit does circuit not work Front panel FPC Replace FPC Check 19.2 MHz OK? 3V3A OK? U905&U909 Reset Check power-up 1V6D OK? circuit and U919 Check power-up 1V8D OK? circuit and U903 MCU OK...
  • Page 29 Replace 5VA, 3V3A OK? U915&U918 4V3A OK? Replace Q104 RX oscillator OK? Q108, Q112 Q106, Q110 Replace CV voltage OK? Q106&Q110 Replace Q108&Q112 Check D107, D108, Q106, Q110 D109, D110, D121, output OK? D122, D125, D126 Check Feedback OK? feedback circuit 19.2MHz Check power oscillator OK?
  • Page 30 No RX audio Check power-up 9V3A output OK? circuit Replace front Front panel output 9V1A output OK? panel Check Q902, Check U703 Q903 U703 output OK? Check IC125 U702 output OK? Check Q701, 2nd local oscillator Q702 18MHz OK? Check D702 Check U701 and IF input present surrounding...
  • Page 31 Power supply Check power supply circuit Control voltage Current OK? Check U801 High Check transistor, bias voltage and low pass filter Check driver PA Repair See VCO transmission troubleshooting Driver PA OK? network chart Power Check matching circuit output OK? Complete Power OK? Complete...

  • Page 32: Disassembly And Re-Assembly For Repair

    Disassembly and Re-assembly for Repair Disassembly 1. Power off the radio, disconnect the power cord and screw out the antenna. 2. Loosen the three screws to remove the front panel. Remove the FFC. 3. Detach the volume control knob, loosen the four screws, and then remove the PCB from the control panel.
  • Page 33 6. Loosen the screw fixing the antenna connector and two screws fixing the PA module, and then take the PCB out. Assembly For the reassembly of the mobile radio, please do the contrary to disassembly procedures. Other procedures are as follows: 1.
  • Page 34 Fasten the two adjustment screws, each with a silicone rubber pad. Connect the palm microphone to the radio (via front-panel connector). When the palm microphone is not in use, hang it on the microphone hanger.

  • Page 35: Exploded View

    Exploded View 10 11 12 13 14 15 16 17 18 19 20 Material No. Description Qty. 6300109000000 Aluminum chassis (RoHS) 7500358000000 Heat sink pad 00 (RoHS) 6100492101000 Waterproof ring for front case 00 (RoHS) 4210090000200 Signal cable (RoHS) 5208010100010 Connector (male) 10Pin (RoHS) 6001079000000 Light-guide plate for keys 00 (RoHS)
  • Page 36 6100488000000 P+R control panel keys 00 (RoHS) 6201893000000 Speaker fixing sheet 0.8mm 00 (RoHS) 7102606021000 Self-tapping screw ST2.6*6.0mm 00 (RoHS) 4210080000700 Speaker cable (with 2-Pin plug) (RoHS) 5001210000390 Speaker 20Ω 4/8W (RoHS) 7400297000000 Speaker felt 00 (RoHS) 7102505000110 Machine screw M2.5*5.0mm (RoHS) 6001076000010 Front case for control panel (RoHS) Logo (RoHS)

  • Page 37: Packing

    Note: Parts that are not marked with Part No. may vary with the radio frequency band. Packing 批注 [Iris1]: 主机图 HYT LOGO 需处理。 MD78X PCB View MD78X Block Diagram MD78X Schematic Diagram...

  • Page 38: Specifications

    Intermodulation 75dB @ 12.5/20/25 kHz Spurious Response Rejection 75dB @ 12.5/20/25 kHz Rated Audio Power Output Rated Audio Distortion ≤3% Transmitter Low Power: UHF1 (400-470MHz), 5-25W; RF Power Output High Power: UHF1 (400-470MHz), 5-45W; -36dBm<1GHz Spurious and Harmonics -30dBm>1GHz ±2.5kHz @ 12.5 kHz Modulation Limiting ±4.0kHz @ 20 kHz...
  • Page 39 to continuous development.

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