Service Manual
250
6802800U74-AN
Chapter 6: Configuration and Testing
NOTICE: If the prompt does not show, wait for the BR to reboot automatically in less
than 30 s.
3 Reset all cal_br* values to 0 by performing the following actions:
a Enter the following command:
fcp -orxch1 -pcal_br<receiver number>-v0
b Repeat step 3 a for each branch.
Step example:
fcp -orxch1 -pcal_br1 -v0
fcp -orxch1 -pcal_br2 -v0
fcp -orxch1 -pcal_br3 -v0
4 Turn off the system gain and reset the BR. Type the following commands:
sge -orx_all –soff
reset -ocontrol
5 Display the receive frequency for the current Base Radio. At the prompt, type: freq -orxch1
and record the result.
If displayed frequency is suitable for measurement, continue with step 7.
6 Set the RX frequency. Use the freq -orx_all -f<X> command, where <X> is the receive
frequency.
Step example: To set the receive frequency to 401.0125 MHz, enter freq -orx_all -
f401.0125.
7 Configure the TETRA Signal Generator (VSG) to produce TCH/7.2 logical channel at the Base
Radio’s current RX frequency by performing the following steps:
a Connect signal generator to the antenna connector on top of the cabinet.
b Set the RF Signal Generator to -100 dBm at the Rx input.
8 Configure the station to decode TCH/7.2 logical channel type. Type ptm -orx_all -mTCH_72
-s15 -tFrame_Trigger -d-5
9 Type enable -orxch1 -dbr1 -son to enable the receiver branch under test.
This command should enable br1, br2, or br3 respectively depending on the receive branches
that you are testing.
10 Type sge -orx_all -soff to turn off the sys gain.
11 Measure RSSI for receive path 1, 2, and 3. Check that BER is 0%. Type ppr -orxch1 -a10
-r1
Step example:
Receiver Number
=
1
2
3
SGC Attenuation
=
26214
26214
26214
Sync Location
=
276
264
258
Sync. Amplitude
=
131070
131070
131070
Total Bits
=
2592
2592
2592
Bits in Error
=
0
0
0
BER (%)
=
0.0000000000
0.0000000000
0.0000000000
RSSI (dBm)
=
-96
-97
-96
12 For each receiver branch, calculate the difference between -100 dBm and measured RSSI level
using the following formula:
RX<receiver branch number> delta = -100-(-<RSSI (dBm) measured level>)