DNT XLP77 User manual

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XLP77
XP8

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Contents
Pages
Specifications ………………………………………………………………………………………….2
Block Diagram …………………………………………………………………………………………3
Schematic Diagram ………………………………………………………………………………….4~5
Channel Frequency Charts …………………………………………………………………………6~7
Printed Circuit Board …………………………………………………………………………………8~9
Alignment and Adjustment ……………………………………………………………………………10
Test Equipment set-up and Alignment Instructions ……………………………………………11~14
Trouble Shooting ………………………………………………………………………………………15
Parts List ……………………………………………………………………………………………16~21
Semiconductor Voltage Chart …………………………………………………………………….22~24
SPECIFICATIONS
STANDARD TEST CONDITIONS
Supply Voltage - Battery …………………………..…………………...….………………………………………. 6.0V DC
Antenna Impedance ……………………………………………..………………………………………....………… 50 Ohm
Audio Frequenc y ……………………………...…………………………………………………………………….. 1 KHz
Main Signal Input ……………………………………………………..…………………………………………………. 1mV
Deviation PMR ….. ……………………...……..………….…………………………..………………….….. AF 1 KHz / 1.5 KHz Dev
LPD …………………………………………………………………………………………………. AF 1 KHz / 3.0 KHz Dev
Au d i o Output Power ……………………………...……………………………………..300mW at external Speaker
Audio Output Impedance……...……...….…………………………………………...……………....8 ohms, non-inductive
Test Temperature …………………………………………………………………………….…………………. 25

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GENERAL SPECIFICATIONS
Transmitter……………………………………..………………….…….……………...…..CPU Controlled PLL Synthesizer
Receiver…………………………………..……...……….CPU Controlled double conversion, super-heterodyne system
Intermediate Frequency 1st ………………………….……………………………………………………………….. 21.7 MHz
2n d …………………………… ……… ……….…………… …………………… …… 450 KHz
Operating Frequencies PMR…………………….….……………...……………………….… 446.00625MHz ~ 446.09375 MHz
LPD…………………………………………………………………..433.07500 MHz ~ 433.77500 MHz
Frequenc y Stability……………………………………………………………..………………...……………………0.0005%
Battery Life……………………………...………………………………………………………………….…30 hours (typical)
Battery…………………………...………………………………………………….6.0 V DC @ 2200 mA Alkaline Batteries
Transmitter/Receiver Switching……………..….…………………………………………...……………………….Electrical
Ambient Conditions, Temperature / Humidity …………….………………………….………… -15°c ~ 55°C / 40% ~ 70%
RECEIVER SPECIFICATIONS
Sensitivity ……………………………………………………………………………… 0.354uV or better for 12dB SINAD
Au d io Outp ut ……………………………………………………………………………………………………….. 300mW
Frequency Response …………………………………………………………………………………… 300 Hz ~ 2500 Hz
Image Rejection …………………………………………………………………………………..…………………… 54dB
Adjacent Channel Rejection …………………………………………….……………………………………………. 60dB
Inter Modulation Distortion ……………………………………………………………………….…………………. 60dB
Conducted Rx Spu rious ………………………………………………………………………. .………………….. 54dB
TRANSMITTER SPECIFICATIONS
Output Power(Conducted) …………………………………………..………………………………………………500mW
Max. Deviation PMR ………………………………………………….…………………………………..… ±2.5 KHz(MAX)
LPD ………………………………………………………………………………………. ±5.0 KHz(MAX)
Fre q u ency Error …………………………………………………………………….……………………5ppm(-15~+55 )
Cu rrent Drain ………………………………………… ……………………….……… ………………………….. 4 0 0 mA
Spurious Emission(Conducted) …………………………………………………….……………… LESS THAN -43dBc.
Antenna Impedance ……………………………………………………………….……………………………… 50 Ohm
PMR Frequency Chart
Channel Frequency (MHz) Channel Frequency (MHz)
1 446.00625Mhz 2 446.01875Mhz
3 446.03125Mhz 4 446.04375Mhz
5 446.05625Mhz 6 446.06875Mhz
7 446.08125Mhz 8 446.09375Mhz

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CTCSS Tone Frequency Chart
NO FREQ.(Hz) NO FREQ. (Hz) NO FREQ. (Hz)
1 67.0 14 107.2 27 167.9
2 71.9 15 110.9 28 186.2
3 74.4 16 114.8 29 179.9
4 77.0 17 118.8 30 186.2
5 79.7 18 123.0 31 192.8
6 82.5 19 127.3 32 203.5
7 85.4 20 131.8 33 210.7
8 88.5 21 136.5 34 218.1
9 91.5 22 141.3 35 225.7
10 94.8 23 146.2 36 233.6
11 97.4 24 151.4 37 241.8
12 100.0 25 156.7 38 250.3
13 103.5 26 162.2
CHANNEL FREQUENCY CHARTS
LPD Frequency Chart
Channel Frequency(MHz) Channel Frequency(MHz)
01 433.07500 36 433.95000
02 433.10000 37 433.97500
03 433.12500 38 434.00000
04 433.15000 39 434.02500
05 433.17500 40 434.05000
06 433.20000 41 434.07500
07 433.22500 42 434.10000
08 433.25000 43 434.12500
09 433.27500 44 434.15000
10 433.30000 45 434.17500
11 433.32500 46 434.20000
12 433.35000 47 434.22500
13 433.37500 48 434.25000
14 433.40000 49 434.27500
15 433.42500 50 434.30000
16 433.45000 51 434.32500
17 433.47500 52 434.35000
18 433.50000 53 434.37500
19 433.52500 54 434.40000

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20 433.55000 55 434.42500
21 433.57500 56 434.45000
22 433.60000 57 434.47500
23 433.62500 58 434.50000
24 433.65000 59 434.52500
25 433.67500 60 434.55000
26 433.70000 61 434.57500
27 433.72500 62 434.60000
28 433.75000 63 434.62500
29 433.77500 64 434.65000
30 433.80000 65 434.67500
31 433.82500 66 434.70000
32 433.85000 67 434.72500
33 433.87500 68 434.75000
34 433.90000 69 434.77500
35 43 3. 92 5 0 0

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PRINTED CIRCUIT BOARD
TOP VIEW

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PRINTED CIRCUIT BOARD
BOTTOM VIEW

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ALIGNMENT AND ADJUSTMENT
TRANSMITTER
A. Power Supply Voltage : 6.0VDC
B. Frequency Setting
1. Connect a frequency counter or Communications Service Monitor to the antenna connector through an RF power
attenuator (5.0 watts min. rating, 20 dB min. attenuation).
2. Depress the PTT switch.
3. Adjust the TCXO such that output frequency is equal to the channel. Frequency with a maximum error of ±300 Hz.
4. Adjust CT-301 for ±300 Hz.
5. Release the PTT switch.
C. Output Power Alignment
1. Set the power supply voltage for 6.0 V DC.
2. Connect a communications Service Monitor or a wattmeter and dummy load to the antenna connector.
3. Depress the PTT switch. To be convinced for PMR 0.5 watt / LPD 10m watt output power.
4. Release the PTT switch.
D. Deviation Adjustment
1. Connect an audio generator to the microphone jack JIG. The audio frequency should be set at 1 KHz
2. Connect an FM deviation meter or communication Service Monitor to the antenna connector through an RF power
attenuates (5.0 watt minimum rating, 20 dB minimum attenuates ). Set the monitor to read peak deviation.
3. Depress the PTT switch.
4. Adjust the audio generator level 100 mV rms.
5. Adjust RV701 for 2.5 KHz maximum deviation.
6. Release the PTT switch.
RECEIVER
A. Power Supply Voltage : 6.0VDC
B. Receiver Alignment
1. Connect an RF signal generator or Communications Service Monitor to the antenna connect.
2. Connect a SINAD meter and oscilloscope across the speaker terminals.
3. Set the output level of the RF signal generator for –47 dBm the generator should be set for PMR 1.5 KHz / LPD 3.0 KHz
deviation of a 1 KHz AF.
4. Set the audio output level for 0.6 Vrms by adjusting volume.
5. Reduce the output level of the RF signal generator for produce a 12 dB SINAD indication

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TEST EQUIPMENT SETUP AND ALIGNMENT INSTRUCTIONS
ALIGNMENT PROCEDURE
Step Setting Connection Adjuster Adjust for
1 RX VCO voltage adjustment
Channel PMR: (P1) 446.00625 MHz
LPD: (69) 434.775 MHz
Mic : Receive
Volume : Optional
Squelch : On
DC voltmeter to VCO
Test point (Figure 1)
L302 0.7~3.5 V DC
2 TX VCO voltage adjustment
Channel PMR: (P1) 446.00625 MHz
LPD: (69) 434.775 MHz
Mic : Transmit (Un-modulated)
Volume : Optional
DC voltmeter to VCO
Test point (Figure 1)
0.7~3.5 V DC
confirm
3 Frequency adjustment
Channel PMR: (P1) 446.00625 MHz
LPD: (69) 434.775 MHz
Mic : Transmit (Un-modulated)
Volume : Optional
Squelch : Optional
Antenna to frequency
Counter, Through
Attenuator (Figure 2)
CT301 ±300 Hz
Figure 1
Figure 2

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TRANSMITTER SECTION
A. Test Equipment Required
•RF power meter (RF SSVM) •DC power supply
•50 ohms dummy load (non-inductive) •Spectrum analyzer
•RF attenuator (50 ohms non-inductive) •Frequency counter
•Oscilloscope •Coupler
•Audio generator •Modulation meter (FM)
B. Alignment Procedure
1. Adjust output Power
Step Setting Connection Adjuster Adjust for
1
High power adjustment
Channel
PMR: (P1) 446.00625 MHz
LPD: (69) 434.775 MHz
Mic : Transmit
Volume : Optional
Squelch : Optional
-Set the power supply voltage for
6V DC
-Connect a communications service
monitor or a wattmeter and dummy
load to the antenna connector.
-Depress the PTT switch.
PMR:
450 ~ 600mW
LPD:
0.8~30mW
confirm
2
Low power adjustment
Channel
PMR: (P1) 446.00625 MHz
Mic : Transmit
Volume : Optional
Squelch : Optional
-Set the power supply voltage for 6
VDC.
-Connect a communications service
monitor or a watt meter and dummy
load to the antenna connector.
-Depress the PTT switch.
RV601 0.5 ~ 30mW
confirm