User's Manual

DMR repeater 18/02/2011 Versione 1.3
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Pag. 27 / 32
5
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The base stations of RA-xxx series are designed to reduce as much as possible the maintenance work. To this
aim, specific solutions have been implemented to prevent aging drifts.
Each time the base station is switched on, a self-calibration process is performed in order to finely tune the
modulation and the demodulation parameters. This process checks the total loop BF-TX-RX-BF by looping the
synthesizer output of the TX on the input of the RX and the DSP unit can store the results into flash memory
and update the older ones which have been previously saved. The correct results of a calibration process are
symptom of an optimal tune of the radio transceiver. If the calibration process ends with errors, the
transceiver can anyway work correctly by loading the older tuning parameters and the newer ones are not
saved.
On the frontal panel of the RA-xxx base stations, there are some LED lamps for monitoring the status of the
equipment. They have different meanings, during power on process, respect to normal running condition.
Here following, a description of the meaning of the LEDs, grouped module by module. In general, if the
equipment works correctly, all leds are off or green; if a warning arises, one or more leds start flashing in red
color; if a problem or an alarm arises, one or more leds are red. (An exception should be made for eventual
leds which show the status of line output criteria: they are red if the corresponding criteria are enabled).
5.2.1 PSU
When the base station is switched on, the 2 leds of PSU module should be green both:
the upper led is red if the supplied input voltage is too low or too high; it is off in case of inverted
polarity of connection to power supply system; it is green if the supplied input voltage belong to the
correct working range;
the lower led is green if the secondary internal voltages are correctly supplied by PSU module,
otherwise it is off.
5.2.2 DSP
When the base station is switched on, DSP module performs a booting process, during which the upper 4 leds
are orange; the lower 2 leds respectively monitor the activity through ethernet connection (the 5
th
led flashes
with orange color during data communication) and the connection to ethernet network (the 6
th
led is green if
the connection is established), therefore they are independent from the logical status of the module. At the
end of the booting process, the DSP module executes the following steps in sequence, which are also visually
indicated by leds:
FW uploading to clock generator (3
rd
led flashes in orange color);
FW uploading to DSP and reset of peripheral modules (2
nd
led flashes in orange color)
DSP startup (1
st
led flashes in orange color)
RX self-calibration(2
nd
led flashes in red color)
TX self-calibration (1
st
led flashes in red color)
TXRX loop self-calibration (3
rd
led flashes in red color)