HYT Science and Technology Co TC1688P Two Way Radio User Manual users manaul

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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.
Product Safety and RF Exposure for Portable Two-Way Radios
Compliance with RF Energy Exposure Standards
NOTICE: This radio is intended for use in occupational/controlled applications where users have
been made aware of the potential for exposure and can exercise control over their exposure. This
radio device is NOT authorized for general population, consumer or similar use.
BEFORE USING THIS RADIO, READ THE TRAINING MATERIAL BELOW WHICH
CONTAINS IMPORTANT OPERATING INSTRUCTIONS FOR SAFE USAGE AND RF
ENERGY AWARENESS AND CONTROL INFORMATION FOR COMPLIANCE WITH RF
ENERGY EXPOSURE LIMITS IN APPLICABLE NATIONAL AND INTERNATIONAL
STANDARDS.
Federal Communication Commission (FCC) Regulations
The FCC has established limits for safe exposure to radio frequency (RF) emissions from
portable two-way radios. The FCC requires manufacturers to demonstrate compliance
with RF exposure limits before portable two-way radios can be marketed in the U.S. When
two-way radios are approved for occupational/controlled environment exposure limits, the
FCC requires users to be fully aware of, and exercise control over, their exposure.
Awareness and control of RF exposure can be accomplished by the use of labels, or by
education and training through appropriate means, such as information and instructions in
user manuals or safety booklets. Your HYT two-way radio has an RF exposure information
label in the battery compartment. The training material below includes useful information
about RF exposure and helpful instructions on how to control your RF exposure.
Your HYT two-way radio is designed and tested to comply with a number of national and
international standards and guidelines (listed below) regarding human exposure to RF
electromagnetic energy. In terms of measuring RF energy for compliance with FCC
exposure guidelines, your radio radiates measurable RF energy only while it is
transmitting (during talking), not when it is receiving (listening) or in standby mode.
Compliance and Control Guidelines and Operating Instructions for Portable
Two-Way Radios
To control your exposure and ensure compliance with the occupational/controlled
environment exposure limits, always adhere to the following procedures:
* Transmit no more than 50% of the time. To transmit (talk), push the Push-To-Talk (PTT)
button. To receive calls, release the PTT button. Transmitting 50% of the time or less is
important since the radio generates measurable RF energy exposure only when
transmitting (in terms of measuring standards compliance).
* Hold the radio in a vertical position in front of the face with the microphone positioned
at least one inch (2.5 cm) away from the lips. Keeping the radio at the proper distance is
important since RF exposure decreases with increasing distance from the antenna.
* For body-worn operation, always use the radio with the HYT Belt-Clip. HYT-approved
accessories, antennas, and device combinations have been tested and comply with the
occupational/controlled environment RF exposure limits. The use of non–HYT approved
accessories may result in exposure levels that may exceed the RF exposure limits for the
occupational/controlled environment.
* If you are not using a body-worn accessory and are not using the radio held in front of
the face, ensure the radio is kept a minimum of 0.7 cm from the body when transmitting.
Keeping the radio at a proper distance is important since RF exposure decreases with
increasing distance from the antenna.
FCC license Information
Your HYT radio operates on communications frequencies which are subject to FCC
(Federal Communications Commission) Rules & Regulations. FCC Rules require that all
operators using Private Land Mobile radio frequencies obtain a radio license before
operating their equipment. Application for license must be made on FCC form 601, and
schedules D, E, and G.
FAX: Forms can be obtained by fax from the FCC Fax-On-Demand system. Call
1-202-418-0177 from your fax machine and request document number 000600 for the
form, schedules, and instructions.
MAIL: Forms can be ordered by telephone, and will be sent to you by first class mail. Call
the FCC Forms Hotline at 1-800-418-FORM (1-800-418-3676).
INTERNET: Form 601 and instructions can be downloaded from the FCC Forms website at:
http://www.fcc.gov/Forms/Form601/601.html
Before filling out your Form 601 application Technical Data section, you must decide
which frequency (or frequencies) you will operate on. Refer to the frequency chart on page
16.
Questions? Call the FCC for license application questions at
1-888-CALL-FCC (1-888-225-5322).
Notices to The User
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may
cause undesired operation.
One or more of the following statements may be applicable:
FCC WARNING
This equipment generates or uses radio frequency energy. Changes or modifications to this
equipment may cause harmful interference unless the modifications are expressly approved
in the instruction manual. The user could lose the authority to operate this equipment if an
unauthorized change or modification is made.
INFORMATION TO THE DIGITAL DEVICE USER REQUIRED BY THE FCC
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can generate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that the interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television
reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer for technical assistance.
SAFETY INFORMATION:
Your HYT portable two-way radio has been designed using a low power transmitter.
When the PTT switch is pressed, the radio generates radio frequency (RF)
electromagnetic energy (EME). This radio is designed to comply with the FCC Report and
Order
FCC 96-326 (August, 1996).
User Safety Information
The following precautions are recommended for personnel safety:
DO NOT transmit until all RF connectors are verified secure and any open connectors
are properly terminated.
SHUT OFF and do not operate this equipment near electrical blasting caps or in an
explosive atmosphere.
When in vehicles with an airbag, do not place a portable radio in the area over an
airbag or in the airbag deployment area.
Do not expose the radio to direct sunlight for a long time nor place it close to a heating
source.
Do not use any portable radio with a damaged antenna. If a damaged antenna comes
into contact with your skin, a minor burn may result.
This equipment should be serviced by a qualified technician only.
Contents
Brief Introduction
LCD Display
Software Description
Circuit Description
CPU Pins
Adjustment Description
Part List 1
Assembly and Disassembly for Repair
Exploded View
Part List 2
Packing
TC1688P PC Board View
TC1688P Block Diagram
TC1688P Schematic Diagram
Specifications
Brief Introduction
1. Antenna
2. Programming Jack
3. Speaker/Mic Jack
4. Power/Volume Knob
Rotate the Power/Volume Knob clockwise until a “click” is heard to turn the radio on, fully
counter clockwise to turn the radio off. When the radio is on, turn the knob to adjust
volume.
5. LCD Display
Indicate operation status of the radio. (Refer to “LCD Display” for details)
6. MENU key
In standby mode, briefly press MENU key to display current channel information and hold
down this key to enter menu mode. During setting, press MENU key to save and switch to
the next setting.
7. “-” key
Used to select the channel/interference eliminator code downwards or change menu
settings.
8. MON key
In standby mode, briefly press MON key to begin channel scanning; hold down MON key
to begin monitoring.
9. MIC
10. Speaker
11. “
”key (CALL key)
If Call feature is enabled, briefly press the CALL key to transmit a call signal; During
setting, press CALL key to save and return to the first setting or exit; Hold down the CALL
key to lock/unlock keypad.
12.
“+” key
Used to select the channel/interference eliminator code upwards or change menu
settings.
13. PTT button
Press and hold PTT, radio operates in transmit mode. Release PTT, radio returns to
receive mode.
14. Belt Clip
Used to clip radio on your belt.
15. Charging Connectors
Connect the charging connectors with that on the charger to begin charging.
LCD Display
1. Battery Meter, used to indicate the battery power.
2. Appears when setting the Alarm Clock or the Alarm Clock is on; Flashes when the
Alarm Clock rings.
3. Appears when keypad lock is on.
4. Appears when setting the call tone.
5. Appears when receiving signals from the selected channel.
6. Appears when transmitting.
7. Appears when transmitting/receiving is enabled.
8. Indicate that the number on the LCD displays interference eliminator code and
channel number. The number under it indicates current interference eliminator code.
9. Two large “8”, a small “1” and two small “8” display the current channel number,
interference eliminator code, frequency number, time or the status of current setting.
10. Indicate that the number on the LCD displays channel number and frequency number.
The number above the icon indicates the frequency number of current channel.
11. Appears between hour and minute when LCD displays clock.
12. Appears when setting VOX or VOX feature is enabled.
13. Appears when scanning channel or setting channel scan add/delete.
14. Appears when setting squelch level.
15. Communication Range Alarm, flashes when your companion is out of range; appears
when setting communication range alarm or communication range alarm is enabled.
16. Appears when setting the clock.
Software Description
Radio Feature Description
Feature
56 UHF frequencies available
Selectable number of available
channels 1-8
Selectable 121 Interference Eliminator
Codes
LCD Display
LCD Backlight
Keypad Lock
VOX Feature
Five VOX Sensitivity Levels Available
10
Battery Power Indicator
Low Battery Alert
11
Channel Scan
12
Battery Save (Sleep Mode)
13
14
Clock Display and Alarm Clock
Five CALL TONES available
15
PC Programmable
16
17
Enable/Disable
Certain
(through PC programming)
Wired Clone
18
19
Monitor
Time Out Timer
20
Auto Squelch
21
Communication Range Alarm
Description
Frequency Range: 461 – 470 MHz
User can select 1-8 frequencies from 56
available frequencies
Include 38 CTCSS and 83 CDCSS
Display operation status and setting
modes
Pressing any key is invalid except PTT,
briefly pressing MENU key and holding
down CALL key.
Only available when connected with
external audio accessory.
The lower the level, the higher the
sensitivity.
The radio will sound alert when the
battery voltage is lower than preset
threshold value.
The radio will only scan the selected 1-8
channels. If 4 channels are selected, the
radio will scan these 4 channels only.
The radio will enable battery save
feature if no button is pressed and no
operation takes place within 25 seconds.
The radio will switch between 200ms
standby mode and 600ms sleep mode.
The radio will sound call tone when
receiving a valid call. User can disable
the call tone.
In this mode, MCU is connected with PC
via UART port.
Features
MCU transfer the data in one radio to
another via UART port.
TOT time: 1 minute or 5 minutes. This
feature can be disabled.
4 squelch levels available. Higher
squelch level makes it harder for the
radio to receive weak signals
The radio will sound alert when you are
almost out of communication range.
10
Radio Modes
User Mode
Conventional Mode
Clock and Alarm Clock Setting Mode
MENU Mode
Channel Setting Mode
Dealer Mode
PC Programming Mode
Wired Clone Mode
Default Setting Mode
Functions and Operations
1. Conventional Mode
Turn the power on. If no key is pressed, the radio will enter conventional mode. In this
mode, you can operate as following:
Receive or press PTT to transmit;
Display clock (It’s set by your dealer) or channel number;
Low battery detect and battery power indication;
VOX feature (Only valid when connecting with external audio accessory) (It’s set by
your dealer);
Communication Range Alarm (It’s set by your dealer);
Alarm Clock (It’s set by your dealer);
Briefly press CALL key to transmit a CALL (It’s set by your dealer);
Press and hold CALL key to enable/disable keypad lock (It’s set by your dealer);
Briefly press MENU key to display current channel information
(frequency number
and interference eliminator code); Press and hold MENU key to enter setting menu;
Press UP/DOWN key to increase/decrease channel number;
Briefly press MONI key to enter channel scan mode; Press and hold MONI key to
begin monitor;
Battery Save feature (It’s set by your dealer).
11
2. Clock and Alarm Clock Setting Mode
Turn the power on while holding down CALL key and PTT key simultaneously. After 2
seconds, the radio enters clock and alarm clock setting mode.
Press UP/DOWN to select upwards/downwards. Press MENU key to save and go to next
setting item. Press CALL key to save and go to the first setting item. If the current item is
the first setting item, press CALL key to save and exit.
In this mode, you can operate as following:
Select to display clock or channel number in conventional mode;
Set hour of the clock;
Set minute of the clock;
Alarm clock enable/disable setting;
Set hour of the alarm clock;
Set minute of the alarm clock.
3. Menu Mode
In conventional mode, press and hold down MENU key to enter menu mode.
Press UP/DOWN to select upwards/downwards. Press MENU key to save and go to next
setting item. Press CALL key to save and go to the first setting item. If the current item is
the first setting item, press CALL key to save and exit.
In menu mode, LCD displays “ ” icon indicating that you can transmit/receive. LCD
displays channel information when pressing PTT to transmit. And the display returns to
the setting mode before transmission when releasing PTT or time out timer is due.
In this mode, you can operate as following:
VOX feature enable/disable and five sensitivity levels setting (It’s set by your dealer);
Call tone setting (five call tones) (It’s set by your dealer);
Button beep enable/disable (It’s set by your dealer);
Squelch level setting;
Communication rang alarm feature enable/disable (It’s set by your dealer);
Battery type setting.
4. Channel Setting Mode
Turn the power on while holding down MON and PTT key simultaneously. After 2 seconds,
the radio enters channel setting mode.
Press UP/DOWN to select upwards/downwards. Press MENU key to save and go to next
setting item. Press CALL key to save and go to the first setting item. If the current item is
12
the first setting item, press CALL key to save and exit.
In this mode, you can operate as following:
Select channel number from 1 to 8;
Select frequency number from 1 to 56;
Select interference eliminator code from 0 to 121;
Set the number of available channels from 1 to 8;
Scan Add/Delete.
5. PC Programming Mode
Insert programming cable into the programming jack and then turn the power on, the radio
enters PC programming mode.
6. Wired Clone Mode
Connect the radio with wired clone cable and then turn the power on while holding down
CALL and MON key simultaneously, the radio enters wired clone mode after 2 seconds.
And then press MON key to begin data transmission.
7. Default Setting Mode (It’s set by your dealer)
Turn the power on while holding down “+” and “-“ key simultaneously to restore the factory
settings after 2 seconds.
13
Circuit Description
1. Frequency Configuration
The receiver utilizes double conversion. The first IF is 21.7 MHz and the second is 450
KHz. The first local oscillator signal is supplied from PLL circuit. PLL circuit in the
transmitter generates the necessary frequencies. Figure 1 shows the frequency
configuration.
Frequency range:
TC1688P: 460—470MHz
(Please refer to “appendix1: TC1688P frequency chart” for more details.)
CF
450KHz
ANT
MCF
ANTSW
IF
SYSTEM
RF AMP
SP
AF AMP
21.7MHz
PLL
TCXO
21.25MHz
RX
PA AMP
TX AMP
PLL
VCO
TX
Title
Size
Date:
File:
MIC
MIC AMP
Number
Revision
4-Feb-2004
Sheet of
D:\RPV599A V2.0\material\TC-168~2.DDBDrawn By:
Fig1. Frequency Configuration
2. Receiver
The receiver utilizes double conversion super heterodyne.
1) Front-end RF Amplifier
The signal from the antenna passes through a transmit/receive switch circuit
before entering the SAW filter F1 to eliminate unwanted signals, and then is
amplified at RF amplifier Q11. The resulting amplified signal then goes to the first
mixer.
Fig.2 Receiver Section Configuration
14
2) First Mixer
The signal from RF amplifier is mixed with the first local oscillator signal from PLL
frequency synthesizer in the first mixer Q15 to generate a 21.7 MHz first IF signal. The
first IF signal is then fed through the 21.7MHz crystal filter F2 to remove spurious signals
from adjacent channel.
3) IF Amplifier
The first IF signal is amplified at Q6 and then enter the IF process chip IC3. The signal is
mixed with the second local oscillator signal to generate a 450KHz second IF signal. The
second IF signal is then fed to a 450 KHz ceramic filter F3 to eliminate unwanted signals
before it is amplified and detected at IC3.
4) AF Amplifier
The AF signal obtained from IC3 is filtered in IC2-A, and then amplified in Q18. Then
resulting AF signal passes through an AF squelch switch IC10 and a volume control circuit
and then is amplified in an AF power amplifier IC5 to drive the speaker.
5) Squelch
Part of the AF signal from IC3 enters IC3 again and the noise component is amplified by a
filter and an amplifier, and then enters Q21 to amplify the noise further. After rectified and
filtered by D7 and C94, the DC signals goes to the analog port IC8 of the microprocessor.
IC8 determines whether to output sounds from the speaker by detecting whether the input
voltage is higher or lower than the preset value.
To output sounds from the speaker, IC8 sends a mute and an AF control signal APA-EN to
IC5. (See figure 3)
Fig. 3 AF amplifier and squelch circuit
15
6) Receiving CTCSS/CDCSS signal
300Hz-and-higher audio frequency of the signal output from IC3 is filtered by low-pass
filter IC2-B, C，D. The resulting signal TI enters the microprocessor IC8. IC8 determines
whether the CTCSS/CDCSS matches the pre-set value, and controls the RX-MUTE, APA
and the speaker output sounds according to the squelch result.
3. PLL Synthesizer
PLL circuit generates the first local oscillator signal for reception and the RF
signal for transmission.
1) PLL circuit
The step frequency of PLL circuit is 5 KHz or 6.25 KHz. A 21.25MHz reference oscillator
signal is divided at IC1 by a mixed counter to create a 5 KHz or 6.25 KHz reference
frequency. Output signal from VCO enters the 16 pin of IC1 and is divided at IC1 by a
dual-module programmable counter. The divided signal is compared in the phase
comparator IC1 with a 5 KHz or 6.25 KHz reference signal. The signal from phase
comparator is filtered through a low-pass filter and generates a VCO voltage adding to
varicap diodes D10 to control the oscillator frequency. (See Figure 4)
Fig.4 PLL Circuit
2) VCO
Q4 composes Colpitts oscillator circuit together with the outside circuit. The oscillator
frequency is controlled by PLL. In receive mode, the oscillator frequency is the first local
oscillator frequency for reception. In transmit mode, the oscillator frequency is the RF
frequency for transmission.
16
4. Transmitter
1) Transmitting AF
The AF signal from the microphone passes through a pre-emphasis circuit, is amplified
and filtered by a low-pass filter at IC6-A, B, Q5 and Q7. The resulting signal enters VCO
for direct modulation. (See figure 5)
2) CTCSS/CDCSS Encoder
The necessary signal for 38 CTCSS and 83 CDCSS encoder is generated by TO pin of
IC8 and FM-modulated to the PLL reference signal. Since the reference OSC does not
modulate the loop characteristic frequency or higher, modulation is performed at the VCO
side by adjusting the balance. (See fig.5)
Fig 5.Transmit AF and CTCSS/CDCSS
3) RF Amplifier
The RF signal obtained from VCO buffer amplifier is amplified by Q9. The amplified signal
is amplified by power amplifier Q3, Q8 and Q10 to generate RF power. (See Fig.6)
ANT
AMP
Q3
DRIVE AMP
Q8
FINAL AMP
Q10
ANT SW
D1
LPF
ANT SW
D2
RX
Fig.6 Final Module
4) Antenna Switch and LPF
The RF signal is passed through a low-pass filter network and a transmit/receive switch
(D1 and D2) before it is passed to the antenna terminal. D1 is turned on in transmit mode
and off in receive mode.
17
5. Power Supply
IC4 supply stabilized power for the control circuit. In transmit mode, IC9 is turned on and
supply voltage for the transmit VCO; Q2 is turned on and supply operation voltage for the
transmitting front-end amplifier. In receiving mode, IC9 is turned on and supply voltage for
the receive VCO high-frequency amplified circuit; Q1 is turned on and supply operation
voltage for the receiving circuit.
6. Control System
The IC8 CPU operates at 4.9152MHz and supply control signal voltage for the control
circuit.
18
Appendix 1: Frequency Chart (Initialization)
Frequency No.
Frequency (MHz)
Frequency No.
Frequency (MHz)
464.5000
29
462.9125
464.5500
30
464.4875
467.7625
31
464.5125
467.8125
32
464.5375
467.8500
33
464.5625
467.8750
34
466.0375
467.9000
35
466.0625
467.9250
36
466.0875
461.0375
37
466.1125
10
461.0625
38
466.1375
11
461.0875
39
466.1625
12
461.1125
40
466.1875
13
461.1375
41
466.2125
14
461.1625
42
466.2375
15
461.1875
43
466.2625
16
461.2125
44
466.2875
17
461.2375
45
466.3125
18
461.2625
46
466.3375
19
461.2875
47
466.3625
20
461.3125
48
467.7875
21
461.3375
49
467.8375
22
461.3625
50
467.8625
23
462.7625
51
467.8875
24
462.7875
52
467.9125
25
462.8125
53
469.4875
26
462.8375
54
469.5125
27
462.8625
55
469.5375
28
462.8875
56
469.5625
19
Appendix 2: CTCSS Table
Display
Number
Frequency（Hz）
Display Number
Frequency（Hz）
67.0
20
131.8
71.9
21
136.5
74.4
22
141.3
77.0
23
146.2
79.7
24
151.4
82.5
25
156.7
85.4
26
162.2
88.5
27
167.9
91.5
28
173.8
10
94.8
29
179.9
11
97.4
30
186.2
12
100.0
31
192.8
13
103.5
32
203.5
14
107.2
33
210.7
15
110.9
34
218.1
16
114.8
35
225.7
17
118.8
36
233.6
18
123.0
37
241.8
19
127.3
38
250.3
20
Appendix 3: CDCSS Table
Display
Number
CDCSS
Display Number
CDCSS
39
023
82
331
40
025
83
343
41
026
84
346
42
031
85
351
43
032
86
364
44
043
87
365
45
047
88
371
46
051
89
411
47
054
90
412
48
065
91
413
49
071
92
423
50
072
93
431
51
073
94
432
52
074
95
445
53
114
96
464
54
115
97
465
55
116
98
466
56
125
99
503
57
131
100
506
58
132
101
516
59
134
102
532
60
143
103
546
61
152
104
565
62
155
105
606
63
156
106
612
64
162
107
624
65
165
108
627
66
172
109
631
67
174
110
632
68
205
111
654
69
223
112
662
21
70
226
113
664
71
243
114
703
72
244
115
712
73
245
116
723
74
251
117
731
75
261
118
732
76
263
119
734
77
265
120
743
78
271
121
754
79
306
80
311
81
315
22
CPU Pins
Pin No.
Pin Name
I/O
Description
SQ
Squelch detect input
EXT-PTT
External Mic PTT detect pin
TIBI
TI
NC
NC
CNVSS
RESET
Reset detect pin
XOUT2
Auxiliary
10
XIN2
32.768KHz crystal
11
VSS
12
XIN1
Master
13
XOUT1
4.9152MHz crystal
14
VCC
15
VCO-CTRL
VCO power supply control
16
RX-CTL
Receiving circuit power supply control
17
RX-MUTE
Receiving tone output control
18
TONE
TONE output pin
19
TX-CTL
Transmit circuit power supply control
20
APA-EN
AF power amplifier power control
21
MIC-EN
MIC Enable
22
LED2
23
LED1
24
COM1
25
COM2
26
COM3
27
COM4
CTCSS/CDCSS external circuit central point
input
CTCSS/CDCSS signal input
oscillator
pin,
connected
with
connected
with
CPU Ground
oscillator
pin,
CPU main power supply
LED control
LCD COM control
23
28
VL3
29
VL2
30
VL1
31
SEG12
32
SEG11
33
SEG10
34
SEG9
35
SEG8
36
SEG7
37
SEG6
38
SEG5
39
SEG4
40
SEG3
41
SEG2
42
SEG1
43
FILT-CTL
CTCSS/CDCSS LPF control
44
PLL-EN
PLL enable
45
PLL-CLK
PLL serial clock
46
PLL-DATA
PLL serial data
47
ST-CTL
VOX side-tone control
48
KEY-OUT2
49
KEY-OUT1
50
KEY-IN3
51
KEY-IN2
52
KEY-IN1
53
EEP-DATA
I/O
EEPROM serial data
54
EEP-CLK
EEPROM serial clock
55
TXD
RS232 Transmit
56
RXD
RS232 Receive
Not connected.
SEG1-SEG12 is LCD SEG control
Keypad signal input output pin
24
57
NC
58
TO
CTCSS/CDCSS signal output
59
POW-DET
Power switch detect input
60
EXT-MIC
External Mic detect pin
61
AVSS
62
VREF
Reference power supply input
63
BAT-DET
Battery voltage detect input
64
VOX-DET
VOX signal input
GND input pin for A-D converter. Connect to
VSS.
25
Adjustment Description
Before the adjustment, please beforehand save the user’s setting.
Required Test Instrument
1. Stabilized power supply 1set
1) The supply voltage can be changed between 2V and 6V DC, and the output
current is 2A or more;
2) The standard output voltage is 3.6V DC;
3) The power supply output voltage stabilizes.
2. Ammeter 1 set
3. Digital Voltmeter 1 set
4. Radio Communication Test Set 1 set
Test and Adjustment
1. Setting: Put the main unit under test on the jig (Note: Make sure the test terminal
and the jig connect well), and turn on the power.
2. VCO
Enable “Default Set Mode” function in programming software. And then press “+”, “-”
and “MENU” keys simultaneously to turn on the radio and enter adjustment mode.
Measurement
Item
Condition
Transmit
VCO lock
voltage
Receive
VCO lock
voltage
3.
Item
Test
Instrument
CH1:
Transmitting
CH1:
Receiving
Terminal
Adjustment
Parts
Method
Digital
Voltmeter
P6
L22
Adjust L22 using
ceramic
screwdriver until
the lock voltage
reaches
the
selected range
Digital
Voltmeter
P6
L22
Check
Specification/
Remarks
2.5±0.1V
Around 1.0V
Receiver
Condition
Adjust to CH1.
RX IF
Press MON for
demodulation
1 second to
output
receive.
Measurement
Test Instrument
Radio
Communication
Test Set SSG:
-60dB
MOD: 1KHz,
DEV: 1.5KHz
FILTER:
0.3~3KHz
Terminal
Antenna
Mic jack
Adjustment
Parts
L20
Method
Adjust L20
using ceramic
screwdriver
until the max.
AF output
signal
appears.
Specification/Remarks
When
adjusting,
rotate the volume
control to the right
position so that the
output won’t limit.
26
Measurement
Item
Condition
Test
Instrument
Terminal
Adjustment
Parts
Method
Specification/Remarks
Radio
Communication
Adjust
Receiving
Sensitivity
to
CH1.
MON
Press
for
second
to
receive.
Adjust to CH1
and set SQ as
level 1
Squelch
Test Set
SSG:
-119dBm,
MOD:1KHz
DEV: 1.5KHz
FILTER:
0.3~3KHz
SINAD:
12dB or higher
Check
Radio
Communication
Test Set SSG:
-119dBm,
Radio
Adjust to CH1
Communication
and set SQ as
Test Set
SSG:
-110dBm,
level 4
Antenna
Mic jack
Reduce
the
SSG
output
signal
gradually until
AF
output
mutes.
Antenna
Mic jack
Squelch level:
-122±1.5dB
Squelch level:
-114±1.5dB
4. Transmitter (Be sure to connect the antenna or dummy load before adjustment)
Item
Condition
Measurement
Test Instrument
Terminals
Adjustment
Parts
Use
Transmitting
Frequency
Adjust to CH1.
Radio
Communication
Test Set
VC1
ceramic
screwdriver
to
adjust
so
that
VC1
the
±2.5ppm
center
frequency is no
more
Antenna
Press PTT to
Specification/Remarks
Method
than
the
error.
transmit.
Radio
Transmitting
power
Check
Communication
≥700mW
Test Set
Ammeter
Max
frequency
deviation
Modulation
Sensitivity
Adjust to CH1.
Press PTT to
transmit.
Adjust to CH1.
Press PTT to
Use
Radio
Communication
Test Set
LPF: 15KHz
AF OUT:
1KHz/150mV
Antenna
Mic Jack
Radio
Communication
Antenna
Mic Jack
screwdriver
to adjust R77 so
R77
that
frequency
Frequency deviation:
2.1KHz~2.2KHz
deviation is in the
regulated range.
Check
Frequency deviation:
1.1KHz~1.8KHz
27
Test Set
BPF:0.3~3KHz
AF OUT:
1KHz/12mV
transmit.
Adjust to CH2
and
CTCSS
code
automatically
turns
to
“1”.
Press PTT to
Use screwdriver
Radio
Communication
Test Set
LPF:0.3KHz
to adjust R153
and R152 so that
Antenna
CTC frequency
Frequency deviation:
0.45±0.05KHz
deviation is in the
regulated range.
transmit.
Adjust to CH3
CTCSS
/CDCSS
Frequency
Deviation
and
CTCSS
code
automatically
turns to “38”.
Press PTT to
Radio
Communication
Test Set
LPF:0.3KHz
Antenna
Check
Frequency deviation:
0.45±0.05KHz
Radio
Communication
Test Set
LPF:0.3KHz
Antenna
Check
Frequency deviation:
0.5±0.1KHz
transmit.
Adjust to CH4;
automatically
turn
to
CDCSS. Press
PTT
to
transmit.
Adjust power
supply output
Set the battery
voltage and check
as A
Low
Battery
Digital Voltmeter
Alert Level
Power
Power
alert level
supply port
supply
Adjust power
supply output
Set the battery
voltage and check
as n
3.3±0.1V
3.1±0.1V
alert level
Adjust power
supply output
Set the battery
Low
Battery
Digital Voltmeter
Power-off
Level
voltage and check
as A
Set the battery
as n
Power
Power
power off level
supply port
supply
Adjust power
supply output
voltage and check
3.1±0.1V
3.0±0.1V
power off level
5. After adjustment, recover the original setting (before adjustment) of the radio through programming
software.
28
Assembly and Disassembly for Repair
Fig. 1
Remove the power knob. See figure1.
Fig. 2
Remove the four screws on the chassis. See figure 2.
Fig. 3
The disassembled unit is shown as figure 3.
29
Fig. 4
Take out the antenna spring, antenna cover and PCB. See figure 4.
30
Exploded View
37
36
35
34
33
32
10
31
Packing
32
Specifications
Frequency Range
460MHz-470MHz
Number of Channels
56 (Max.)
Number of CTCSS
38
Number of CDCSS
83
Frequency Error
≤±2.5PPM
Transmitting Power
1.0W
Radiated Power
0.2W
Transmitter Spurious Emission
≤20uW
Modulation Limitation
±2.5KHz
Bandwidth
≤8.5KHz
Adjacent Channel Power Rejection
≥60dB
Modulation AF Distortion
≤10%
Receiving Sensitivity
≤0.3uV (12dB SINAD)
Co-channel Rejection
≥-8dB
Blocking
≥85dB
Intermodulation Rejection
≥50dB
Adjacent Channel Selectivity
≥50dB
Receiver Spurious Emission
≤2nW
Receiving AF Distortion
≤10%
33

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Create Date                     : 2006:05:24 14:36:23+08:00
Modify Date                     : 2006:05:24 14:36:23+08:00
Page Count                      : 33
Creation Date                   : 2006:05:24 06:36:23Z
Mod Date                        : 2006:05:24 06:36:23Z
Producer                        : Acrobat Distiller 5.0 (Windows)
Author                          : rosec
Metadata Date                   : 2006:05:24 06:36:23Z
Creator                         : rosec
Title                           : Microsoft Word - TC1688P service manual _add Radiated Power_.doc

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