HYT TR-50 Series User manual

TR-50 Theory of Operation
1
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.
①LED Indicator
②Power/Volume
Control Knob
③RJ45 Pro rammin
I/O Port
④Speaker
⑤RX Antenna
Connector
⑥TX Antenna
Connector
⑦AC Power Inlet
⑧ AC PowerSwitch
⑨DC Power Inlet

TR-50 Theory of Operation
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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.
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.

TR-50 Theory of Operation
3
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 potentiometer 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.

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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 ）

TR-50 Theory of Operation
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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
Item Condition
Measurement Adjustment
Specification
/Remarks
Test
Instrument Test Point
Part Method
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
Item Condition
Measurement Adjustment
Specification
/Remarks
Test
Instrument Test Point Part Method
Power
Supply
Digital
Voltmeter VDD VR1
Use ceramic
adjuster to
adjust VR1 till
the voltage is
within
requirement.
8.0 ± 0.2V
3. Relay Component (Note: Before adjustment, make sure the antenna (dummy
load) are properly connected and space-isolated)
Item Condition
Measurement Adjustment
Specification/
Remarks
Test
Instrument Test Point Part
Method

TR-50 Theory of Operation
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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
465.0125MH
z
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

TR-50 Theory of Operation
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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

TR-50 Theory of Operation
8
TR-50U（
（（
（7）
））
）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
2KΩJ R9 T2A 1
13 01053022 Resistor 0805
3KΩJ R22 T1A
14 01053022 Resistor 0805
3KΩJ 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
1KΩJ 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

TR-50 Theory of Operation
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36 18002802 TR-50
CNPCB FR4 1.2T/2L/1 1
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

TR-50 Theory of Operation
10
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.

TR-50 Theory of Operation
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Exploded View

TR-50 Theory of Operation
12
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

TR-50 Theory of Operation
13
Packing
说明书
珍珠棉下内衬
珍珠棉上内衬
TR-50中继台主机
包装箱
HYT
Upper Liner of
Pearl Cotton Owner’s Manual
Main Unit
Packing Box
Lower Liner of
Pearl Cotton

TR-50 Theory of Operation
14
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%