User's Manual

Doc. No.
Rev.
Date
1.00
2011-12-08
Damm Cellular Systems A/S, Denmark
TETRAFLEX
®
V7.5 MANUAL - TX Combiner for BS41x
TetraFlex® 7.5 Manual 4-13
4.2.2.6 Power measurement
The outputs of the two directional couplers are connected with BNC cables to the rear of
AI411, which contains two precision RMS detectors to convert the actual power into DC
current.
The current outputs are forwarded to the BSC412 Base Station Controller, which can display
the actual output and reflected power at the TX antenna connector.
The following OM commands can be used to check the output
F15/F (output and freq for each running TR412)
F13 (summarized output after combiner)
The AI411 is provided with two adjustments on the front plate, to allow accurate calibration of
the displayed power.
4.2.2.7 TCC411 TX Combiner Controller
The TC411 Cavity Combiner is equipped with the TCC411 TX Combiner Controller, which
controls the position of the stepper motors based on channel information received from the
TR41x Transceiver.
At power-up the Micro-Controller tunes the cavity to the upper mechanical end stop to know
its exact position.
When receiving a channel command from the TR41x the MC calculates the required motor
position and automatically tunes the cavity to the required position. The required motor
position is calculated from a calibration table inside the MC, created when the TC411 is
factory adjusted.
The channel command to the TCC411 is automatically generated in the TR41x when a
channel change is done.
If the TR41x is powered off or removed, the TCC411 will automatically after about 30
seconds in brackets return the cavity to the upper end stop to avoid it to interference with
other cavities.
The TCC411 is provided with an O&M interface and can be accessed from the BSC411.
The center frequency of the cavity can be fine adjusted with the 13 command in the TCC411.
This is normally not needed but could be done if e.g. the BS is placed at a high altitude,
where the air pressure is lower, which will increase the cavity frequency.