Motorola ASTRO 25 GTR 8000 Manual page 191

NOTICE: This procedure uses an internal SINAD in the base radio. If a field technician chooses
to use a service monitor as an external SINAD meter, see "SINAD Measurement Procedure
(measured by Service Monitor)" within Base Radio Service Help → Service Screens →
Alignment Screens → Carrier Squelch Alignment tab in the CSS Online Help.
Procedure:
1 Connect to the transceiver module in Configuration/Service Software (CSS) through an Ethernet
connection. See Connecting Through an Ethernet Port Link on page
2 From the menu, select Service → Alignment Screens.
3 Optional: If the base radio is not already in Service Mode, place in Service Mode, as follows:
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 Alignment Screen as described in
4 Select the Carrier Squelch Alignment tab.
5 Make the following connections to the base radio:
a Disconnect the BNC antenna cable or N connector if a preselector is present from the
Receive Antenna Port.
b Connect the service monitor GEN port to the base radios Antenna Port with a BNC
connector.
6 Set up the service monitor.
a For 25 kHz channels, set the modulation to 1 kHz tone at 3 kHz deviation.
b For 12.5 kHz channels, set the modulation to 1 kHz tone at 1.5 kHz deviation.
c Set the service monitor to generate at the receive frequency.
d Set the RF level an initial value of –80 dBm.
7 To measure 25 kHz channel SINAD, click 25 kHz. To measure 12.5 kHz channel SINAD, click
12.5 kHz.
8 Select the SINAD measurement box.
9 Click Start SINAD Measurement.
The SINAD Measurement Value box displays wait, and after 10 seconds starts to display the
SINAD results in dB.
NOTICE: With the initial setting of the service monitor, set for a carrier level of –80 dBm,
expect a SINAD of >26 dB. Compensate for the loss of the cable connecting the service
monitor to the base radio. If the receiver is inhibited, SINAD displays a meaningless
value.
10 Change the service monitor RF level and read the SINAD again until the value is 12 dB.
NOTICE: When the SINAD value is close to 12 dB, wait 10 seconds after changing the
RF signal generator level. The base radio needs 10 seconds to stabilize the SINAD
measurement. Compensate for the loss of the cable connecting the service monitor to
the base radio.
11 Record the signal generator RF level. Compare this value to the sensitivity specifications. See
GTR 8000 Base Radio Specifications on page 40
Chapter 5: GTR 8000 Base Radio Optimization
140.
step 2.
for the appropriate value.
MN003286A01-E
191