DR600 Service Manual
6. Adjustment
During maintenance, the repeater may needs some testing and modulation for technical index after
changing the components.
6.1 Preparation
Please prepare the tools and equipment before testing the DMR repeater:
Integrated tester
PC and CPSp software
AEROFLEX 3920
Spectrum analyzer FSU
Antenna interface converter
Universal interface
6.2 Method of Modulation and Test
6.2.1 Local Oscillator Adjustment
Subject
Test Point
Test Procedure
Standard
12.8M
Clock
base band
board J6
1. Enter test mode “12.8M Clock”.
2. Set HP8921 to TX mode; connect the reference
frequency port to HP8921 RF high power input
port.
3. Enter computer modulation mode.
4. Adjust to 12.8MHz
±
1Hz.
≤±
1Hz
Rx
localoscilla
tor power
Rx board
test point
TP3005
1. Enter test mode “Receiver BPF”.
2. Set HP8921 to TX mode.
3. Connect the TP3005 test poit on the RX board
to HP8921RF high power input port.
4. Check the frequency: (Rx frequency
-51.65MHz)
±
100Hz; output power
>
10dBm.
Frequnency
tolerance
≤±
200Hz
Output power
>
10dBm
Tx central
frequency
&power
Tx module
J200
1. Enter test mode “Low Freq.Mod Deviation”.
2. Set HP8921 to TX mode.
3. Connect Tx module RF output to HP8921 RF
high power input port.
4. 4. Adjust to :
±
100Hz, Check: output power
>
15dBm.
Frequency
tolerance
≤±
200Hz
Output power
>
15dBm
40
Summary of Contents for DR600
Page 1: ......
Page 37: ...DR600 Service Manual 33 ...
Page 110: ...DR600 Service Manual Figure 2 Rx Module Bottom Board PCB View 106 ...
Page 111: ...DR600 Service Manual Figure 3 Tx Module Top Board PCB View 107 ...
Page 113: ...DR600 Service Manual Figure 6 Baseband Mainboard Top Board PCB View 109 ...
Page 114: ...DR600 Service Manual Figure 7 Baseband Mainboard Bottom Board PCB View 110 ...
Page 116: ...DR600 Service Manual Figure 10 Power Board Top Board PCB View 112 ...
Page 118: ...DR600 Service Manual Figure 13 Enternet Board Top Board PCB View 114 ...
Page 119: ...DR600 Service Manual Figure 14 Enternet Board Bop Board PCB View 115 ...
Page 150: ...DR600 Service Manual Figure 21 Baseband Mainboard Schematic Diagram 146 ...