GTR 8000 Base Radio
5.10.4 Verifying Receiver Performance (Analog Operation)
When and where to use:
Use this procedure to verify receiver performance by measuring the receiver sensitivity (SINAD) for an analog
base radio.
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 Steps
1
Connect to the transceiver module in CSS through an Ethernet connection. See
.
2
Select
Service → Alignment Screens
from the menu.
3
Place the base radio into service mode:
a. If the base radio is not already in service mode, click
Change to Service Mode
.
Step result:
A confirmation dialog box appears.
b. Click
OK
.
Step result:
The base radio begins a reset sequence to change modes, which takes a few minutes.
c. After the base radio resets, 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.
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6871022P86-A - November 2012
Содержание GTR 8000
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