Page 1
TR-50
PORTABLE REPEATER
Page 2
Contents
General……………………………………………………………………………..1
Brief Introduction…………………………………………………………………..2
Theory of Operation………………………………………………………………4
Alignment & Calibration…………………………………………………………..6
Part List 1………………………………………………………………………….9
Assembly and Disassembly for Repair………………………………………11
Exploded View……………………………………………………………………12
Part List 2…………………………………………………………………………13
Packing……………………………………………………………………………14
PCB Board View…………………………………………………………………15
Schematic Diagram……………………………………………………………...17
Specifications…………………………………………………………………….19
Page 3
TR-50 General
- 1 -
General
Manual Scope
This manual is intended for use by experienced technicians familiar with similar types of
communication equipment. It contains all service information required for the equipment and is current
as of the publication date.
User Safety Information
The following precautions are recommended for personnel safety:
z DO NOT transmit until all RF connectors are verified secure and any open connectors are
properly terminated.
z SHUT OFF and do not operate this equipment near electrical blasting caps or in an explosive
atmosphere.
z When in vehicles with an airbag, do not place a repeater in the area over an airbag or in the airbag
deployment area.
z DO NOT expose the repeater to direct sunlight for a long time nor place it close to a heating
source.
z DO NOT use any repeater with a damaged antenna. If a damaged antenna comes into contact
with your skin, a minor burn may result.
z This equipment should be serviced by a qualified technician only.
Page 4
TR-50 Brief Introduction
- 2 -
Brief Introduction
1. LED Indicator
The following table indicates LED indication and corresponding radio status.
LED Status
Red Power on
Green Receive (or in battery save mode)
Blue Transmit
2. Power /Volume Control Knob
Rotate the Power/Volume Control Knob clockwise until a “click” is heard to turn the repeater on. Then
the LED turns red when the power is on. Rotate counter-clockwise to turn the repeater off until a “click” is
heard. When the repeater is on, turn the Knob to adjust volume. (Suggestion: adjust volume to the
lowest while Monitoring is unnecessary.)
3. RJ45 Programming I/O Port
Used by the dealer to program the repeater’s receiver and transmitter respectively.
4. Speaker
Used to monitor the communication status of current channel.
5. Rx Antenna Connector
N/F type RF connector.
6. Tx Antenna Connector
N/F type RF connector. Applied as antenna port when duplexer is installed.
Page 5
TR-50 Brief Introduction
- 3 -
7. AC Power Inlet
After correctly connecting AC power supply, turn on the switch to enter AC power supply mode.
8. AC Power Switch
9. DC Power Inlet
The float charging function will operate in AC power supply mode with external gel cell batteries
connected. When AC mains power is lost, it will auto-revert to the back-up battery supply without
mechanical relay.
Page 6
TR-50 Theory of Operation
- 4 -
Theory of Operation
I. Power Control
The control board draws a general 13.8V dc power supply, which is converted through U1, a 3-terminal
regulator, to 8.0V dc for the receiver and transmitter.
Fig. 1 Power Supply Block Diagram
II. Relay Control
When a valid signal is detected, the COR goes low and trigger PTT of the transmitter. At the same
time, the audio output from discriminator is routed to MIC input of the transmitter. The trimmable
resistor VR3 is used to adjust the receive audio output to the proper level for transmit audio deviation.
III. Float Charging Function
The TR-50 provides selectable AC (100-240V ac) power supply. Normally users can equip battery
back-up system connected to the external DC jack with floating charge function in the mean time. This
provides auto-revert to DC battery once the AC mains fails.
IV. Fan Control
This repeater provides three options of cooling fan control: PTT controlled, temperature controlled and
continuous operation. The power supply of the fan is controlled through a 5V voltage detector,
HT7050A. When the input is above 5V, the output is high-Z; when lower than 5V, the output goes low.
Page 7
TR-50 Theory of Operation
- 5 -
V. AF Amplification
The receive audio is routed to another AF amplifier NJM386M, which is convenient for the users to
monitor the activities of current channel.
VI. Definition for control ports
The definition of all the pins goes as follows:
1. J3 1pin——NC
2pin——TLED-
3pin——MIC+ Transmitter
4pin——PTT
5pin——TLED+
6pin——RLED+
7pin——SP+
8pin——RLED- Receiver
9pin——Rx AF
10pin——COR
2. J6
1pin——ETxD
2pin——ERxD Transmitter
3pin——ATxD
4pin——ARxD Receiver
3. RJ45 EXT
1pin——ARxD
2pin——MIC
3pin——ATxD
4pin——ERxD
5pin——GND
6pin——ETxD
7pin——EXT PTT
8pin——SB+（8V）
Page 8
TR-50 Alignment & Calibration
- 6 -
Alignment & Calibration
I. Required Test Instrument
1. DC power supply 1 set
1） Output range: 12~15 VDC (Minimum); output current: 3 A or more
2） Specified output: 13.8 VDC
3） The output should be stable, with minimal ripple & noise.
2. Ammeter 1 set
3. Digital voltmeter 1 set
4. Radio communication test set 1 set (with duplex function)
II. Test and Adjustment
1. Power supply
Measurement Adjustment
Item Condition
Test
Instrument
Test Point Part Method
Specification/
Remarks
DC output
voltage
Digital
Voltmeter
DC output
terminal
Potentiometer
in Switch
power supply
Use ceramic
adjuster to
adjust till the
voltage is
within
requirement.
13.8±0.2V
2. Power Supply for receiver and transmitter
Measurement Adjustment
Item Condition
Test
Instrument
Test Point Part Method
Specification/
Remarks
Power Supply
Digital
Voltmeter
VDD VR1
Use ceramic
adjuster to
adjust VR1 till
the voltage is
within
requirement.
8.0±0.2V
Page 9
TR-50 Alignment & Calibration
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3. Relay Component (Note: Before adjustment, make sure the antenna (dummy load)
are properly connected and space-isolated)
Measurement Adjustment
Item Condition
Test
Instrument
Test
Point
Part Method
Specification/
Remarks
Operation
Frequency
PC operation
system:
WIN98SE
/WIN2000
Programming
software:
HT-50E
RJ45
Programming
port
Receiver:
1CH
455.0125MHz
2CH
455.0125MHz
CTCSS：67.0Hz
3CH
455.0125MHz
CDCSS：025
Transmitter:
1CH
465.0125MHz
2CH
465.0125MHz
CTCSS：67.0Hz
3CH
465.0125MHz
CDCSS：025
Relay
deviation
Turn to CH1 and
enter duplex
mode. With
Transmitter
connected to
“RF in” port and
receiver to “Dual
out” port. Align
the output of
“RF GEN” to
455.0125MHz。
BPF:0. 3~3KHz
AF OUT:
1KHz/150mV
Antenna VR3
Use ceramic
adjuster to
rotate VR3
until the
deviation is
within
requirement.
Frequency
deviation:
3.0±0.2KHz
Tx Power
Turn to CH1,
press PTT key
on handheld
microphone to
transmit (or
check Tx power
in duplex mode)
Antenna Check
Power Output:
4.5±0.5W
Page 10
TR-50 Alignment & Calibration
- 8 -
Duplex
sensitivity
Turn to CH1,
and operate
in duplex
mode
BPF:0.
3~3KHz
AF OUT:
1KHz/150mV
Antenna Check
Sensitivity squelch on
transceiver:
-119±3dBm
Sensitivity squelch
off: -120±3dBm
Page 11
TR-50 Part List 1
- 9 -
TR-50 Part List 1
No.
Part No. Description Ref. Symbol. Location Sum.
1
01031002 Resistor 0603 10Ω J R20 T1B 1
2
01033932 Resistor 0603 39KΩ J R17 T1B 1
3
01051022 Resistor 0805 1KΩ J R3 T3B 1
4
01051032 Resistor 0805 10KΩ J R11 T1A
5
01051032 Resistor 0805 10KΩ J R6 T4A
6
01051032 Resistor 0805 10KΩ J R16 T1B 3
7
01051202 Resistor 0805 12Ω J R21 T1B
8
01051202 Resistor 0805 12Ω J R18 T3C
9
01051202 Resistor 0805 12Ω J R19 T1B 3
10
01051222 Resistor 0805 1.2KΩ J R14 T5C 1
11
01051532 Resistor 0805 15KΩ J R7 T4A 1
12
01052022 Resistor 0805 2KΩ J R9 T2A 1
13
01053022 Resistor 0805 3KΩ J R22 T1A
14
01053022 Resistor 0805 3KΩ J R10 T2A 2
15
01054712 Resistor 0805 470Ω J R4 T4B 1
16
01055122 Resistor 0805 5.1KΩ J R5 T4B 1
17
01061022 Resistor 1206 1KΩ J R8 T5A 1
18
0122473H
Trimmable resistor 47KΩ
MVR22HXBRN473
VR1 T3B 1
19
02051043 Capacitor 0805 0.1uF K 25V C10 T1B
20
02051043 Capacitor 0805 0.1uF K 25V C11 T1B 2
21
02054713 Capacitor 0805 470P K 50V C1 T4B
22
02054713 Capacitor 0805 470P K 50V C2 T5A
23
02054713 Capacitor 0805 470P K 50V C5 T4A
24
02054713 Capacitor 0805 470P K 50V C6 T4A 4
25
02054733 Capacitor 0805 0.047uF K 25V C9 T1B 1
26
02054743 Capacitor 0805 0.47uF K 16V C7 T1B 1
27
0417AV70 Double diode BAV70 D4 T5A
28
0417AV70 Double diode BAV70 D8 T1B 2
29
0417AW56 Double diode BAW56 D2 T2A 1
30
0501798D PNP 2SB798-T1(DK) Q3 T5A 1
31
0506114E Bias Resistor, NPN DTC114EE(TL) Q5 T1A 1
32
05173906 PNP MMBT3906 Q2 T5A
33
05173906 PNP MMBT3906 Q4 T5A
34
05173906 PNP MMBT3906 Q6 T1A 3
35
07LM3860 OP Amp NJM386M IC2 T1B 1
36
18002802 TR-50 CNPCB FR4 1.2T/2L/1 1
Page 12
TR-50 Part List 1
- 10 -
37
T0610155
1206
TMCSA1A155MTR.1.5UF/10V.M
C3 T3C 1
38
T0616106
Ta-capacitor1206
TMCMA1C106MTR 10uF 16V
C8 T1B
39
T0616106
Ta-capacitor1206
TMCMA1C106MTR 10uF 16V
C13 T1B 2
40
T0635104
Ta-capacitor1206
TMCSA1V104MTR.0.1uF 35V.M
C4 T3C
Page 13
TR-50 Assembly and Disassembly for Repair
- 11 -
Assembly and Disassembly for Repair
Disassemble the main unit
1. Remove with tool the four screws on the rear side of main unit, and the four on the bottom of the
main unit together with the rubber gasket. Pull out the outer cover.
2. Remove the four screws fixing the duplexer and then remove those fixing the transceiver.
3. Remove the screws fixing transmitter, power supply, and control board.
4. Remove the accessories such as fan and Jack.
Page 14
TR-50 Exploded View
- 12 -
Exploded View
Page 15
TR-50 Part List 2
- 13 -
Part List 2
No.
Material No.
Material Name
1 14090360 M3×6 Screw (zinc-plated, black)
2 1413200A TR50 Cover
3 1613000A TR50 Rubber foot mat
4 14090360
M3×6 Screw ( zinc-plated, black)
5 14090420
Screw M4×20
6 19130030 Fan 12V 0.17A
7 14052010
Machine Screw M2×10 (zinc-plated, color)
8 0050107100 Transmitter
9 14052010
Machine Screw M2×10 (zinc-plated, color)
10 0050107100 Receiver
11 14090360
M3×6 Screw (zinc-plated, black)
12 0950100710 TR50 Control Board
13 1413201A TR50 Machine case
14 1513000A TR50 Knob (vol)
15 1713008A Sponge gasket (SP)
16 13130805 Speaker
17 1713009A Fast bar washer
18 14026010
Screw M3×6
19 1904020A MC-500N Switching power supply
20 14090360
M3×6 Screw ( zinc-plated, black)
21 14090360
M3×6 Screw ( zinc-plated, black)
22 08MODUP10000 TR-50 duplexer
23 14090430 M4 Hex nut
24 14090360
M3×6 Screw (zinc-plated, black)
25 08130002 Antenna receptacle (Tx)
26 08130002 Antenna receptacle (Rx)
27 14040360
M3×6 Screw (flat head)
28 08130006 AC receptacle
29 1904019A AC Switch
30 08131102 DC Jack
Page 16
TR-50 Packing
- 14 -
Packing
Page 17
Page 18
Page 19
1 2 34
A
B
C
D
4
321
D
C
B
A
MODEL NAME
FILE NO. REV
HYT Science & Technology Co.,Ltd
DRAWN BY CHECKED APPROVAL
PAGE
OF
DATE
PART NAME
COR
PTT
RLED-
MIC
RX AF OUT
+
-
3
2
5
6
1
4
8
7
IC2
NJM386M
C13 10uF
D8
BAV70
12
D5
R13 12Ω
R19 12Ω
1
2
3
4
5
6
7
8
9
10
J3
CON10
12
D6
1
23
Q5
DTC114EUA
C9 0.047uF
+
C8 10uF
R11 10K
R16
10K
12
D7
1
2
3
4
5
6
7
8
.RJ45 EXT.
C7
0.47uF
C10 0.1uF
R14 1.2K
3
2
1
Q6
MMBT3906
C11 0.1uF
R20
10Ω
R21
12Ω
VR3 47K
R17
10K(47K)
+
C12
220uF
R12 12Ω
SP+
SP-
GND
GND
GND
GND
GND
GND
8V
13V
RLED+
NC
TLED+
TLED-
SP+
0Ω
R23
39K
R22
8V
1
2
3
4
J6
CON4
ATxD
ARxD
ETxD
ERxD
EXT MIC
EXT PTT
R15 12Ω
GND
REPEATER INTERFACE COMMUNICATION BOARD
00
2
SW1
10K
GND
R18
12Ω
22
TR-50
R. Leung
NU
Page 20
1 2 34
A
B
C
D
4
321
D
C
B
A
MODEL NAME
FILE NO. REV
HYT Science & Technology Co.,Ltd
DRAWN BY CHECKED APPROVAL
PAGE
OF
DATE
PART NAME
11223
3
44556
6
JP1
CONN SOCKET 3x2
R10
3K
1
2
3
D2
BAW56
VDD
2
OUT
1
VSS
3
IC1 HT7050A
R5
5.1K
1
2
J2
CON2
C5
470p
R8
1K (1/4W)
VR1
10K
Q1
PSS8550D
1
2
J1
CON2
R6
10K
R2
1KΩ/2W
VR2
10K
负温
3
1
2
Q2 MMBT3906
D4
BAV70
C2
470pF
F1
3A
C1
470pF
R9
2K
C6
470p
3
1
2
Q3
2SB798
3
1
2
Q4
MMBT3906
VIN
3
ADJ
1
VOUT
2
U1
LM317T
R4 470Ω
R1
0.22Ω/2W
+
C4
1.5uF/10V
+
C3
0.1uF
D3
9.1V / 1A
+
-
4
1
2
3
D1
KBPC606
1
2
3
J4
CON3
R3
270Ω
R7
15K
1
2
3
J5
CON3
GNDGND
GND
+
GND
GND
GND
GND
GND
GND
GND
PTT
8V
12V
DC 13.8V
SW1
POWER MANAGEMENT BOARD
00
12TR-50
R. Leung
June, 2004
Page 21
TR-50 Specifications
- 19 -
Specifications
Frequency Range
146.0000MHz-174.0000MHz
440.0000MHz-470.0000MHz
Channel 1
Frequency Capacity
≤±5PPM
Valid Transmit Power
≤5W
Transmitter Spurious Radiation
≤50uW
Modulation Limit
± 5.0KHz
Occupied Bandwidth
≤8.5KHz
Adjacent Channel Power Rejection
≥55dB
Modulation AF Distortion
≤5%
Receive Sensitivity
≤0.3uV (12dB SINAD)
Co-channel Rejection
≥-8dB
Blocking
≥85dB
Inter-modulation Rejection
≥50dB
Adjacent Channel Selectivity
≥50dB
Receiver Spurious Radiation
≤20nW
Receive AF Distortion
≤5%
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