TR850 Service Manual
4. Adjust to 12.8MHz
±
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
Tx lock
voltage
testing
Tx board
TP100
1. Turn on the repeater.
2. Set HP8921 to TX mode.
3. Connect TX port to HP8921 RF high power input
port.
4. Enter computer modulation mode.
5. Click Tx low power test points to test lock voltage
0.5V
≤
CV voltage
≤
4.5V
Rx lock
voltage
test
Rx board
TP100
1. Turn on the repeater.
2. Set HP8921 to TXmode.
3. Connect TX port to HP8921 RF high power input
port
4. Enter computer modulation mode.
5. Click Rx sensitivity test points to test lock voltage
0.5V
≤
CV voltage
≤
4.5V
6.2.2. Tx Adjustment
Subject
Modulation Procedure
Standard
Tx high
power
1. Enter pc tuning mode.
2. Enter modulation mode”High Power”.
3. Adjust PC software value; observe power value on the
integrated tester.
4. Adjust to test power: 40
±
2W.
5. Modulate the frequency one by one.
40
±
5W
Tx low
power
1. Enter computer modulation mode.
2. Enter modulation mode “Low Power”.
3. Adjust PC software value; observe power value on the
20W
±
1.5db
45
Summary of Contents for TR850
Page 1: ......
Page 45: ...TR850 Service Manual 5 4 Connection 1 2 3 4 6 8 7 5 9 10 13 14 15 16 18 17 11 12 41 ...
Page 90: ...TR850 Service Manual Figure 1 Rx Module Top Board PCB View 86 ...
Page 91: ...TR850 Service Manual Figure 2 Rx Module Bottom Board PCB View 87 ...
Page 93: ...TR850 Service Manual Figure 5 Power Amplifier Module Bottom Board PCB View 89 ...
Page 94: ...TR850 Service Manual Figure 6 Baseband Mainboard Top Board PCB View 90 ...
Page 95: ...TR850 Service Manual Figure 7 Baseband Mainboard Bottom Board PCB View 91 ...
Page 97: ...TR850 Service Manual Figure 10 Power Board Top Board PCB View 93 ...
Page 114: ...TR850 Service Manual Figure 16 Baseband Mainbaord Schematic Diagram 110 ...
Page 169: ...TR850 Service Manual Figure 1 Rx module Top Board Position Mark Diagram 165 ...
Page 170: ...TR850 Service Manual Figure 2 Rx Module Buttom Board Position Mark Diagram 166 ...
Page 172: ...TR850 Service Manual Figure 5 Power Amplifier Module Buttom Position Mark Diagram 168 ...
Page 173: ...TR850 Service Manual Figure 6 Baseband Mainboard Top Board Position Mark Diagram 169 ...
Page 174: ...TR850 Service Manual Figure 7 Baseband Mainboard Buttom Board Position Mark Diagram 170 ...
Page 176: ...TR850 Service Manual Figure 10 Power Board Top Board Position Mark Diagram 172 ...
Page 193: ...TR850 Service Manual Figure 16 Baseband Mainboard Schematic Diagram 189 ...