Service Manual
249
6802800U74-AN
Chapter 6: Configuration and Testing
where <X> is the frequency you want to set.
Step example: To set the receive frequency to 401.0125 MHz, type freq -orx_all -
f401.0125 .
5 Type sge -orx_all -son and press ENTER to enable system gain alignment.
6 At the prompt, type: ptm -orx_all -mTCH_72 -s15 -tMulti_Frame_Trigger -d0
For Stabilock 4031/4032, use single slot only and delay : -6
ptm -orx_all -mTCH_72 -s8 –tFrame_Trigger -d-6
NOTICE: It may be necessary to adjust the trigger delay set by changing the -d
parameter and running the ppr command in step 9. The Sync Location should be around
1000.
7 At the prompt, type: enable -orxch1 -dbr1 -son.
This command enables the receiver branch under test and should enable br1, br2, or br3
respectively depending on the branches that you are testing.
8 Set the signal generator to generate a T1 signal and inject to the relevant antenna port.
9 Type ppr -orxch1 -a1000 –r1 to analyze the received RF signal quality of the Base Radio.
Record the results.
Step example:
Receiver Number
=
1
2
3
SGC Attenuation (dB)
=
0
0
0
Sync. Location (1/10
us) =
1058
1058
1058
Sync. Amplitude (dB)
=
-81
-81
-81
Total Bits/Msgs
=
86400
86400
86400
Bits/Msgs in Error
=
2186
2214
2251
BER/MER (%)
=
2.530092
2.562500
2.605324
RSSI (dBm)
=
-118
-118
-119
10 Type ppr –orxch1 –a1 –r200 to check for small peaks of interference. Record the results.
11 Repeat step 9 through step 10 for all receiver branches.
12 Disconnect the equipment.
13 Repeat procedure for all remaining Base Radios.
6.5.4.3.3
Verifying and Tuning the Receiver RSSI Levels
The RSSI level affects the sensitivity of the interference alarm.
Prerequisites:
Set up the equipment for receiver verification and tuning. Perform Setting Up the Equipment for
Receiver Verification on page 248.
Contact your local Motorola Solutions representative or Technical Support to obtain required password.
WARNING: RF energy burn hazard or equipment damage. Before disconnecting antenna and
connecting signal generator to the antenna connector, ensure that none of the Base Radios is
currently transmitting.
Procedure:
1 Turn on the BR.
2 Enter the BR Test Application mode and log on with dev credentials. See Logging on to the Test
Application on page 225.