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Hytera Communications Corporation Limitedwww.hytera.com
Hytera Communications Co., Ltd
Global Customer Service Center
TC508 Technical Training
Edited by Adam Sun01MAR2012
Hytera Communications Corporation Limitedwww.hytera.com
1. Function & Feature
2. Technical Specification
3. Software & Setting
4. Disassembly & Re-assembly
5. Circuit Description & Analysis
6. Trouble Shooting
Content
Hytera Communications Corporation Limitedwww.hytera.com
1. Function & Feature
The TC-508, one of the market-leading products in Hytera's commercial radio series, is an ideal choice for facilities, hospitality, manufacturing, retail, education and construction.
As the affordable and reliable two-way radio for business and industry, TC-508 can largely enhance your productivity and management efficiency. The excellent design of HYT’s compact TC-508 portables guarantees superior ergonomics.
Moreover, it can ensure a great performance in any operating conditions, thanks to MIL-STD 810 & Hytera's 5-year ALT test. Besides, TC-508 provides up to 14 hours of battery life to ensure long-lasting performance and convenience. Affordable price and distinct performance - TC-508 deserves your trust.
Features
Hytera Communications Corporation Limitedwww.hytera.com
1. Function & Feature
Radio Overview
①PTT
②SK1
③SK2
④Antenna
⑤Channel Selector Knob
⑥Radio On-Off/Volume
Control Knob
⑦Speaker
⑧Microphone
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1. Function & Feature
Main Functions
High/Low Power Switch
Monitor
CTCSS/CDCSS and Tail eliminate
Channel Scan
Battery Save
Low Battery Alert / Battery Strength Indicator
Voice Operated Transmit (VOX)
Busy Channel Lockout (BCL)
Time-out-Timer (TOT)
PC Programmable
Wired Clone
Selectable Carrier Squelch Level (2 levels: normal or tight)
Hytera Communications Corporation Limitedwww.hytera.com
1. Function & Feature
2. Technical Specification
3. Software & Setting
4. Disassembly & Re-assembly
5. Circuit Description & Analysis
6. Trouble Shooting
Content
Hytera Communications Corporation Limitedwww.hytera.com
2. Technical Specification
Testing Specifications
General
Freq. Range400-420MHz, 450-470MHz
136-154MHz, 146-174MHz
Channel Capacity 16
Channel Space 25KHz/ 12.5KHz*
Working Voltage 7.4V DC
Battery Capacity 1300mAh (Li-ion)
Working Time (5-5-90) > 11 hours
Working Temperature -25 ~+60℃ ℃
Dimensions( H×W×D
) (with battery, without
antenna)
113mmx 54mmx35mm
Weight (with battery and
antenna250g
Frequency Stability ±2.5ppm
RX
Sensitivity ≤0.224μV
Adjacent Channel
Selectivity65dB
Intermodulation 60dB
Spurious
Response
Rejection
65dB
Rated Audio
Power
0.5W (SPK impedance is
16 ohm)
Rated Audio
Distortion ≤5%( 0.5W)
TX
RF Power Output 4W/ 2W
Spurious and
Harmonics≤-26dBm
Modulation Limiting ≤5KHz
FM Noise ≥40dB
Audio Distortion ≤5%
Hytera Communications Corporation Limitedwww.hytera.com
2. Technical Specification
CV Testing and Adjust
CV voltage
High Freq. Low Freq.
RX TC101 3~ 4V ≥0.5V
TX TC101 3~ 4V ≥0.5V
CV Testing Point
TC101
RX and TX use the same VCO. When
adjusting TC101, we need check TX
and RX CV voltage at same time.
Notice
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2. Technical Specification
Status Indication
Hytera Communications Corporation Limitedwww.hytera.com
2. Technical Specification
Status Indication
Hytera Communications Corporation Limitedwww.hytera.com
1. Function & Feature
2. Technical Specification
3. Software & Setting
4. Disassembly & Re-assembly
5. Circuit Description & Analysis
6. Trouble Shooting
Content
Hytera Communications Corporation Limitedwww.hytera.com
3. Software & Setting
Programming Software
Now, please open the programming software.
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Software Adjustment
Please do not tune these items if not repairing/testing necessary.
We can enter Tuning Mode by Programming Software.
3. Software & Setting
Hytera Communications Corporation Limitedwww.hytera.com
1. Function & Feature
2. Technical Specification
3. Software & Setting
4. Disassembly & Re-assembly
5. Circuit Description & Analysis
6. Trouble Shooting
Content
Hytera Communications Corporation Limitedwww.hytera.com
4. Disassembly & Re-assembly
Disassembly steps as following:
1. Turn the radio off
2. Remove antenna, channel selector knob, channel
switch knob. (1,2,3)
3. Remove the fixed screws. (4,5)
4. Lift the chassis by its bottom and pull it out of the
radio case.
1
2 3
5
4
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4. Disassembly & Re-assembly
5. Remove the fixed screws on the PCB and side PTT board
6. Remove the antenna terminal with soldering
7. Lift the PCB and remove it from the chassis.
The Re-assembly method is similar and reverse the steps.
Hytera Communications Corporation Limitedwww.hytera.com
1. Function & Feature
2. Technical Specification
3. Software & Setting
4. Disassembly & Re-assembly
5. Circuit Description & Analysis
6. Trouble Shooting
Content
Hytera Communications Corporation Limitedwww.hytera.com
5. Circuit Description & Analysis
The Circuit including:
The general circuit is composed of TX circuit, RX circuit, power
supply circuit, control circuit and etc.
1. RF parts: RX, TX
2. FGU: PLL and VCO
3. Control Circuit: power supply and CPU
4. Baseband
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5. Circuit Description & Analysis
Block Diagram
Hytera Communications Corporation Limitedwww.hytera.com
U601MCU
SRT3210
MICJACK
VOX_DETQ611D616
R204C204C205
R607R632R206
AF AMPU302
SWVOLUME
S201
SW_C
HANN
AL
RESET ICU605
E2ROMU603
DATA/STB/CK
LD
TX_C
TL
SAVE
SDA/SCL
EC0/EC1/EC2/EC3
MODE
AF
VOX
1
2
PTT/SK1/SK2
APC
MIC
INR_LE
D
T_LE
D
LEDD601
LEDD602
SPK
MODE_OUTRXD
TXD
SP_JACKJ3
PJ-D3027D
1
2
MICB201
QT_OUT
T/R
QT_OUT
QT_MODULATING FILLER
AF_MODULATING FILLER
BATTERYG602
W/N
AF_SWQ302
BEEPBE
EP
AF_M
UTE
RF_M
UTE
5. Circuit Description & AnalysisMCU Control, Signal Processing and Audio Power Amplification
Hytera Communications Corporation Limitedwww.hytera.com
5. Circuit Description & AnalysisMCU Control, Signal Processing and Audio Power Amplification
1) MCU Control CircuitMCU control circuit is composed of MCU, EEPROM, and keys, etc. This section has the following functions: to initialize data of the radio and save data to EEPROM; to detect battery voltage and signals from external keys, LD and VOX, and to make response; to transmit required data to PLL based on the channel encoding status; to switch and control RX/TX based on the input PTT signal; to switch the squelch circuit on/off based on the input signaling decode signal and squelch level signal; to controlcircuits of high/low power switch, audio power amplifier, VCO power supply, RX power supply and TX power supply; (for programming) to communicate with PC via RXD/TXD based on the RS232 protocol, and transmit/receive data to/from PC.2) Signal Processing Circuita. TX Baseband ProcessingThe audio signals input from MIC are divided into two parts. One part enters U601, and is then converted into digital signal by analog-to-digital conversion (ADC). Afterwards, the converted signal will go through a series of processing including low-pass filtering, AGC, companding, high-pass filtering, encrypting and pre-emphasizing, and then it will be output as baseband signal after digital-to-analog conversion (DAC).The baseband signal is processed by the active low-pass filter and then sent to VCO for modulation; for the other part, it will go through VOX circuit (Q611 and D616) and then sent to MCU for VOX processing.
Hytera Communications Corporation Limitedwww.hytera.com
5. Circuit Description & AnalysisMCU Control, Signal Processing and Audio Power Amplification
b. RX Baseband ProcessThe demodulated IF signals with CTCSS/CDCSS signaling enter U601 for decoding. After analog-to-digital conversion, the IF signals will be converted into digital signals, which go to low-pass filter for filtering and then are divided into two parts. One part is processed by CTCSS/CDCSS decoder, and the other is processed by high-pass filter and then is subject to de-emphasis, decryption, signal expansion etc, and finally digital-to-analog conversion to output audio signal.3) Audio Power AmplifierThe audio signal output from U601 is amplified by the audio power amplifier (U302) to drive the speaker directly.
Hytera Communications Corporation Limitedwww.hytera.com
5. Circuit Description & AnalysisMCU&Power
Hytera Communications Corporation Limitedwww.hytera.com
5. Circuit Description & Analysis
MCU&Power
Hytera Communications Corporation Limitedwww.hytera.com
5. Circuit Description & Analysis
AF AMP and Speaker/MIC interface
Hytera Communications Corporation Limitedwww.hytera.com
The 7.4V battery voltage is converted
to 5V via DC-DC module U604, and
further converted via LDO U602 to 3V
including two channels: VCC and
VDD. VCC powers CPU and VDD
powers PLL circuit. The 5V voltage will
be converted via LDO U606 to 4.5V
including two channels: VT and V-
SAVE. V-SAVE powers VCO circuit
and VT powers TX circuit. Finally, V-
SAVE controlled by Q604 and Q305
outputs VR, which supplies RX circuit.
5. Circuit Description & Analysis
Power supply
LDOU604
LDOU602
LDOU606
V_BAT
TX
_CT
L
SAV
E
VT
VR SW Q604Q305
V_SAVE
VR
VCC
VDD
5V
RF_
MU
TE
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Power supply
5. Circuit Description & Analysis
Hytera Communications Corporation Limitedwww.hytera.com
PLL&VCO
5. Circuit Description & Analysis
PLL Frequency SynthesizerThe PLL circuit mainly provides the first local oscillator signal (for RX) and RF carrier signal (for TX). It is composed of VCO and PLL chip, allowing frequency tracking and channel switching under the control of MCU signals.
U601MCU
SRT3210
TX/RX VCO Q102
QT_MODE FILLER
R103C132
PLL LOOP FILTER
1
3
2
4
DATA/STB/CK
LD
QT_OUT
CP
BUFFER AMPQ105
2SC4226
LOCAL OSCILLATOR AMPQ104
2SC5108
VDD
MODE
T/R SWQ103D105
Crystal XT 101
38.4MHz
T/R
PLLU102
MB15E03SL
Hytera Communications Corporation Limitedwww.hytera.com
PLL&VCO
5. Circuit Description & Analysis
1) PLLThe step frequency of PLL circuit is 5 KHz or 6.25 KHz. In U101, the 38.4MHz reference oscillator signal is divided into 5 KHz or 6.25 KHz reference frequency via a fixed counter in PLL. The signal from VCO enters the PLL after processed by the buffer amplifier, and then it is applied to the variable frequency divider in PLL for division. After division, the signal is compared with the reference frequency at the phase detector (PD) in PLL. The signal from the PD passes through a low-pass filter and then is applied to the varactors (D101 and D102) of VCO to control the output frequency. Then the RF signal is processed by the buffer amplifiers (Q104 and Q406), and controlled by D404 and D405 to only serve as TX signal or RX first local oscillator signal.2) VCOThe VCO section is realized by the three-point capacitor oscillator circuit. TX VCO and RX VCO share the same oscillator circuit. Q103 controls the switch between TX VCO and RX VCO.
Note: If the PLL is unlocked, the LD pin of U101 outputs low level. If the microprocessor detects such situation, TX/RX operation is prohibited, and an alarm sounds.
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5. Circuit Description & Analysis
PLL&RX
Hytera Communications Corporation Limitedwww.hytera.com
5. Circuit Description & Analysis
PLL and 38.4MHz Ref. Crystal
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5. Circuit Description & Analysis
TX&VCO
Hytera Communications Corporation Limitedwww.hytera.com
VCO
5. Circuit Description & Analysis
Hytera Communications Corporation Limitedwww.hytera.com
The audio signal from MIC is sent to the MCU chip (U601) directly. The
baseband signal processing circuit in U601 converts the amplified audio signal to
digital signal via A/D conversion, and then converts the digital signal to analog
audio signal via D/A conversion after all processing procedures such as filtering,
signal compression, encryption, pre-emphasis, TX gain control and amplitude
limiting are completed. Then the analog audio signal from MCU passes through
the low-pass filter circuit and directly goes to VCO for frequency modulation. The
modulated HF carrier signal passes through the buffer amplifiers (Q104 and
Q406), and goes to the amplifier (Q401) through the RF switch (D404). Then the
amplified RF signal enters the low-pass filter circuit after it is further amplified by
the pre-driver (Q402) and final-stage power amplifier (Q403), and then it will be
finally transmitted via antenna after ultra harmonics is removed.
TX
5. Circuit Description & Analysis
Hytera Communications Corporation Limitedwww.hytera.com
TX
5. Circuit Description & Analysis
TX/RX VCO Q102
POWERMATCH ANT LPF
APCU401
VT
LO
VT
POWER AMP Q403 RD07
POWER AMPQ402RD01
POWER AMPQ401
2SC4226
LOCAL OSCILLATOR AMPQ104
2SC5108
SWQ405
DTC114EE
T/R SWQ103D105
VR SWD405
VT SWD404
APC_SWQ404
DTC114YE
APC
T/R
LOCAL OSCILLATOR AMPQ406
2SC4226
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RF power amplifier
5. Circuit Description & Analysis
The modulated carrier signal from VCO is pre-amplified at Q104 and Q406, and controlled at D404 and D405. Then it is amplified by the front-stage amplifier Q401, the pre-driver Q402 and the final-stage amplifier Q403 orderly. Finally it goes to the LC low-pass filter (LPF) and is transmitted from the antenna after high-order harmonics are removed by LPF.
APC circuit is composed of Q404, Q405 and U401. U401 controls the bias voltage at the gates of Q402 and Q403, to control TX current and to further regulate power.
Hytera Communications Corporation Limitedwww.hytera.com
TX/RX switch and RF LPF
5. Circuit Description & Analysis
Hytera Communications Corporation Limitedwww.hytera.com
RF AMP and TX final AMP
5. Circuit Description & Analysis
Hytera Communications Corporation Limitedwww.hytera.com
Current detect and APC
5. Circuit Description & Analysis
Hytera Communications Corporation Limitedwww.hytera.com
RX
5. Circuit Description & Analysis
After the RF signals are received from the antenna, the undesired out-of-band signals are filtered out at the bandpass filter. Then the remaining RF signals are amplified by LNA Q501. Afterwards, the amplified signal goes through the bandpass filter again to eliminate undesired out-of-band interference signal.After being filtered and amplified, the RF signals and first LO signals are mixed at Q502, and then the mixed signal is filtered by crystal filter XF501 to get 38.85MHz differential signals as the first IF signal.After being amplified by Q506, the IF signal goes to chip U611, where the signal will be mixed with the second LO signal (38.4MHZ). Next, the signals will be filtered by CF501 to produce 450KHz IF signal.When the IF signals are processed by demodulation circuit (including U611 and CD501) to generate audio signals, which are delivered to IC Q613 for amplification and output in two channels. After simple filtering, one channel of signals is sent to MCU U601 for CTCSS/CDCSS decoding; for the other channel, it goes through two stages of low-pass filter first, and then it goes to high-pass filter U610 (consisting of four operational amplifiers) for audio processing. Finally, the signals will be sent to audio power amplifier U302 for amplification so as to drive the speaker.
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RX
5. Circuit Description & Analysis
Hytera Communications Corporation Limitedwww.hytera.com
5. Circuit Description & Analysis
RX LNA and BPF
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5. Circuit Description & Analysis
Mixer and IF filtering and amplifier
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5. Circuit Description & Analysis
IF processing IC, noise selecting freq. and AF HPF
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Level Diagram
5. Circuit Description & Analysis
Hytera Communications Corporation Limitedwww.hytera.com
1. Function & Feature
2. Technical Specification
3. Software & Setting
4. Disassembly & Re-assembly
5. Circuit Description & Analysis
6. Trouble Shooting
Content
Hytera Communications Corporation Limitedwww.hytera.com
PCB Top Side
AF AMPTDA2822
MIC
Memory24C1632.768KHZ
Crystal
CPU
APC Circuit
Antenna Soldering
Point
6. Trouble Shooting
Hytera Communications Corporation Limitedwww.hytera.com
6. Trouble Shooting
Volume Switch
SPK socket
MIC socket
Power management IC
38.85MHZ Crystal Filter
450
IF IC:4116
Audio process IC 2902
PLL IC MB15E03SL
VCO
50C24
Power AMP RQ0002
PTT board
Channel switch
Battery connector
PCB Bottom Side
Hytera Communications Corporation Limitedwww.hytera.com
6. Trouble Shooting
ANT test point
PTT test point
CV test point
LD checking point
BPF test point
External power supply connection point
PCB Key Testing Point
Hytera Communications Corporation Limitedwww.hytera.com
6. Trouble Shooting
1. Can not power on
2. Voice abnormal
3. TX problem
4. RX problem
5. Unlock
Hytera Communications Corporation Limitedwww.hytera.com
1. Can’t Power On
6. Trouble Shooting
Description: After connecting 7.4V DC voltage, the radio has not any response.
Analysis: Check power supply circuit and control circuit.
Checking Steps: Battery connector is connected well with main radio Power switch The pin 1 of Regulator IC U604 output is 5V or not U602 output is 3V or not CPU power on crystal 32.768KHz CPU pins is false soldering or broken
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1. Can’t Power On
6. Trouble Shooting
U604
U606
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6. Trouble Shooting
2. Voice Abnormal (no voice when power on; abnormal voice)
Description
No voice or abnormal voice when power on the radio
Analysis
AF output circuit is composed of volume switch S201, AF amplifier
U302 and power supply tube Q303, speaker socket and speaker.
Checking Steps
Speaker, speaker line’s soldering
Speaker socket is connected well or not
Volume switch
AF amplifier IC U302 TDA2822 is
working well or not. Q303 (717) is
damaged or not.
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6. Trouble Shooting
U606
RD07
APCC420
3. TX Problem (No TX power or low power)
DescriptionAfter power on, press PTT, LED is red, but no TX power output or it is low.AnalysisCheck RF AMP and APC circuit. Test TX power supply, Q611/5T, U430/APC, and test TX power by communication analyzer to judge which stage has problem.Checking Steps 6pin of U606 output voltage is 4.5V or not Check TX current, High power is about 1.6A, and 0.8A Low
Power. If normal, that means APC circuit has no problem, generally, the power amplifier Q403 (RD07) is burnt.
Check the positive pole of C420 in APC circuit has about 3.5V voltage output, or not
Check the bias voltage of final power amplifier is normal or not
Check driver amplifier and final power amplifier RD07 is damaged or not
Test the input pin’s voltage of Q403 is 3-5V while pressing PTT. If not, check the APC circuit.
Hytera Communications Corporation Limitedwww.hytera.com
6. Trouble Shooting
4. RX Problem (Low RX or No RX)
DescriptionAfter power on, TX is normal, but, no RX(green led is not on) or RX sensitivity is low.AnalysisCheck RX filtering circuit or IF processing circuit.Checking Steps VHF/UHF RX sensitivity is 0.25/0.28µV. We use signal
injection to check which stage has problem. The important is IF AMP and LNA/Mixing circuit. The first IF is 38.85MHz, the 2nd IF is 450kHz.
Check the carrier squelch level, and CTCSS setting. The output voltage of Q604 is 5V or not Mixer Q502 is damaged or not 450kHz filter is loose or damaged or not 38.85MHz filter is normal or not IF processing IC U611 is false soldered or damaged Demodulator is loose or damaged or not
Hytera Communications Corporation Limitedwww.hytera.com
6. Trouble Shooting
Description
After power on, the radio sounds “Dudu…”. And it can’t
transmit or receive signal.
Analysis:
check RX/TX common circuit and PLL circuit.
Checking Steps:
Power supply of PLL is 3V or not
CV voltage is normal or not
86pin of CPU is normal or not (H:Lock, L:Unlock)
38.4MHz crystal is normal or not
IC U101 PLL part is false soldering or damaged
5. Unlock
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THANKSPlease call or email Hytera Global Customer Service Center, if you have any
question about Hytera Product.
Service Direct Line: +86-755-86137081
Email: [email protected]
Website: www.hytera.com