O U T D O O R U N I T A N D A N T E N N A
14
Transmitter
In the transmitter, the output frequency of the synthesizer module is doubled and the resulting
signal is amplified. Both functions are performed by one monolithic microwave integrated circuit.
By switching on and off the supply voltage, it is possible to switch on and off the transmitter.
TX block has a waveguide output.
Duplexer
The duplexer is intended for combining the signals from the transmitter and receiver into the
single waveguide to the antenna. This device is a narrow-band waveguide filter with one common
waveguide output. Tx frequency setting in one station should match Rx frequency at the other
station and vice versa.
Controller Module
The controller module is intended to ensure the control and checking of the radio unit and a link
with the IDU.
The control functions are intended for:
•
Setting of the synthesizer frequencies
•
Setting of the output power
•
Switching the receiver on and off
The checking functions are provided for:
•
Measuring the level of the received signal
•
Measuring the signal attenuation in the cable
•
Checking the synchronism of the synthesizers
•
Measuring the temperature of the radio unit
•
Checking the humidity in the radio unit
Settings of the frequency and transmitter power are accomplished from the IDU management
interface or through the management console. The ODU has its own management controller and
the memory for configuration storage. The configuration information is stored in the ODU
management controller EPROM. Consequently, in the case of the ODU replacement, the current
configuration of link may change therefore the new parameters should be set.
SAF Tehnika is shipping CFM-LM Outdoor Units with the following default settings:
•
The transmitter is switched off (TxPower=off);
•
The channel is set to one in the middle of the sub-band.
The Tx channel can be adjusted from the IDU or using other available management methods.
The arrangement of frequency channels is given in tables in Chapter
Frequency Channel Arrangement
.
Содержание CFM-13-LM
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