Motorola ASTRO 25 GTR 8000 Manual page 186

MN003286A01-E
Chapter 5: GTR 8000 Base Radio Optimization
3 Connect to the transceiver module in Configuration/Service Software (CSS) through an Ethernet
connection. See Connecting Through an Ethernet Port Link on page
4 From the menu, select Service → Test And Measurement Screen.
5 Select the ASTRO BER RSSI Report tab.
6 If the base radio is not in service mode perform the following, otherwise go to
a Click Change to Service Mode.
b At the confirmation screen, click OK.
The base radio halts activity in the current mode and switches operation to the requested
mode.
c Re-open the Test And Measurement Screen as described in
7 Set up the test in CSS:
a In the Pattern Type field, select 1011 Hz (FDMA).
b In the Sampling Period (sec) list box, enter the number of required seconds.
The time specifies the window over which the BER is calculated.
c For BER measurement, in the Rx Branch for BER Test field, select the receive branch.
The available selections for Rx Branch for BER Test are dependent on the set Pattern
Type.
8 Measure the BER and RSSI:
a Click Start BER Measurement or Start RSSI Measurement.
The Test And Measurement Screen dialog box displays the following results:
• BER results in percentage
• RSSI results expressed in dBm.
NOTICE: With the initial setting of the service monitor set for a carrier level of -47
dBm, you should expect a BER of 0.0 % and an RSSI level between -49 dBm and -45
dBm. Compensate for the loss of the cable connecting the service monitor to the base
radio.
NOTICE: If the receiver is inhibited, RSSI displays a meaningless value.
b To create a log file for the BER and RSSI measurement, click Start Log.
The Log Save As window appears.
c Change the RF level and read the BER and RSSI again at the level appropriate for the base
radio. The value should be less than 5%. See
40 for the appropriate value.
d Key the transmitter in the base radio and readjust the generator output level until 5% BER is
indicated on the service monitor. Record this level.
Less than 1 dB of degradation should occur due to the transmitters being keyed.
e Dekey the transmitter.
f Click Stop BER Measurement or Stop RSSI Measurement to stop the test.
9 If Rx B is used as a backup and the site is not TDMA:
a Disconnect the test cable from the generator to Rx A at the base radio and connect it to Rx
B.
186
140.
step 4.
GTR 8000 Base Radio Specifications on page
step 7