User's Manual

Table Of Contents
DIB-500 R4.1 Configuration
Adjusting a cavity coupler – optional (cavity variant only)
148 Installation, Operation and Service Manual 90DIB500R41IM_FCC02 99.1
5. Connect the antenna cable to the adapter of the measuring probe. Alternatively,
connect a dummy load (50 Ω), refer to Figure 6.5.
Figure 6.5 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. Enable the carrier to be measured with the command car sw-reset x, x corre-
sponds to carrier no.
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 handwheel must be adjusted so that the maximum transmitting power is achieved.
When turning the handwheel, the transmitting power climbs to a maximum value and
then drops back down with continued turning. If this happens, turn the cavity coupler
handwheel back in the opposite direction in order to reset the maximum value.
Damage to circulators
When new frequencies are configured via the NMC-515 network management client,
the circulators may be damaged if the cavity coupler(s) is/are not adjusted to these fre-
quencies.
Configure a maximum transmitter output of 1,000 mW via the NMC-515 Configura-
tionManager for the corresponding carrier(s) using the carrier item. This corre-
sponds 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