Installation and Operation Manual 90DIB500IM02 – 5.2
121
DIB-500 R4.1
Commissioning
Setting a cavity coupler to the TX frequency
5. Connect the antenna cable to the adapter of the measuring probe. Alternatively,
connect a dummy load (50
Ω
), refer to Figure 5.30.
Figure 5.30 Connected measuring equipment
6. Switch on the appropriate measuring equipment and check the AVG (W) and SWR
of the R&S NRT measuring equipment on the display.
7. Enter
the
car sw-reset x
command to enable the carrier to be measured;
x corresponds to the carrier number.
➥
The set power is displayed:RF output power on the R&S NRT (display [AVG]).
8. Release the hand wheel on the front of the corresponding cavity coupler.
Adjusting the maximum transmitter output
The transmitter output increases up to the maximum value and then falls back down. If
this happens, turn the cavity coupler handwheel back in the opposite direction in order
to reset the maximum value.
When new frequencies are configured via the NMC-515 network management cli-
ent, the circulators may be damaged if the cavity coupler(s) is/are not adjusted to
these frequencies.
➔
Configure a maximum transmitter output of 1,000 mW via the NMC-515 Configura-
tionManager for the corresponding carrier(s) using the “carrier” object. This corresponds
to a value of 30 dBm.
➔
Adjust the cavity coupler(s) as soon as possible to the corresponding frequencies.
The cavity coupler(s) must be adjusted manually.
9. Use the cavity coupler handwheel to adjust the Tx frequency until the maximum
transmitter output is present at the antenna connection.
Measuring equipment
GPS
Antenna connectors
Antennna cable/dummy load
