5.10.5 Checking Receiver Sensitivity (Self-test Method) (IV and D)
9
Click
Start SINAD Measurement
.
Step result:
The SINAD Measurement Value box displays wait, and after 10 seconds starts to display the
SINAD results in dB.
With the initial setting of the service monitor set for a carrier level of –80 dBm, expect a SINAD of
>26 dB. Remember to compensate for the loss of the cable connecting the service monitor to the base
radio. If the receiver is inhibited, SINAD will display a meaningless value.
10
Change the service monitors RF level and read the SINAD again until the value is 12 dB.
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. Remember to 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
Base Radio/GPW 8000 Receiver Specifications, page 1-12
for the appropriate value.
a. Key the transmitter in the base radio and readjust the generator output level until 12 dB SINAD is indicated
on the service monitor. Record this level.
Step result:
Less than 1 dB of degradation should occur due to the transmitters being keyed.
b. Dekey the transmitter.
12
Click
Stop SINAD measurement
to stop the measurement.
13
Uncheck the
SINAD measurement
box.
14
If no further testing is needed, click
Change to Normal Mode
to return the base radio to normal operation.
15
Remove and restore the following connections to the base radio:
a. Remove the service monitor GEN port connection from the base radio Antenna Port.
b. Restore the Antenna connection to the Receive Antenna Port.
5.10.5 Checking Receiver Sensitivity (Self-test Method) (IV
and D)
When and where to use:
Use this procedure to check the receiver sensitivity for the station without any test equipment. The receiver
uses a factory calibrated low-level noise source at the receiver input to check performance. This procedure can
be performed remotely.
Procedure Steps
6871022P86-A - November 2012
5-39
Содержание GTR 8000
Страница 2: ......
Страница 4: ......
Страница 6: ......
Страница 14: ......
Страница 18: ......
Страница 22: ......
Страница 26: ......
Страница 60: ......
Страница 80: ...GTR 8000 Base Radio Figure 2 22 Base Radio Backplane Mounting Location 2 20 6871022P86 A November 2012 ...
Страница 177: ...5 8 1 3 VHF Tuning Procedure Figure 5 1 Preselector Tuning VHF 6871022P86 A November 2012 5 7 ...
Страница 181: ...5 8 2 3 UHF Tuning Procedure Figure 5 2 Preselect Tuning UHF 6871022P86 A November 2012 5 11 ...
Страница 230: ......
Страница 234: ......
Страница 244: ......
Страница 286: ......
Страница 300: ......
Страница 338: ......