Skanti TRP 9250, Техническое руководство, Страница: 98 / 289

Final Installation Check
For operation of the equipment please refer to chapter 2. Note that an appropriate programmed
Configuration PROM must be installed in the Transceiver Unit, see section on page 3-xx.
The Antenna Tuning Unit will tune automatically to the antenna first time the equipment is keyed
on a new frequency or when the "TX Tune" button is pressed. During the tune sequence and normal
transmission all transmitter circuits are monitored to ensure safe operating conditions. If
transmission conditions are bad ( bad antenna installation, high temperatures, etc. ) the transmitted
power will be reduced to a safe limit. If the transmission condition is improved automatic recovery
to full power takes place.
The reason for the protection can be investigated by pressing "Prog" "22" "Enter" ( Read Protection
Code ). The displayed protection code(s) is described on page @ of this manual.
If transmission conditions becomes too severe ( a broken antenna, too high temperature, etc. ) or
a fault occurs in the equipment the "Protec" annunciator will flash in the display, indicating that
radiated power no longer can be maximized. The output power will be reduced or totally switched
off. When such a condition occurs, read the Protection Code as described above to investigate the
nature of the fault.
Installation of optional Telex Filter
To enable telex/DSC operation a receiver crystal filter must be installed in position ’Option Filter’
on PCB ’RX/EX Signal Path 715’ in the Transceiver Unit. The centre frequency of the filter must be
455kHz and the bandwidth must be in accordance with baud rate and frequency shift of the
transmission. The centre audio input/output frequency is adapted to the associated telex modem
by programming of Telex Subcarrier. See 2-62 Configuration.
To install the filter remove the cover of the Transceiver Unit and unplug the ribbon cables and the
coaxial cables from PCB 715S. Loosen the two screws from the module and remove it.
Locate position ’Option Filter’ on the PCB. Mount the telex filter in that position and solder the
terminations. Reassemble the Transceiver Unit. Fitting the filter in position ’OptionFilter’ along with
either the PCP 717S or the Interface-A 718S automatically enables the "TLX" key on the Transceiver
Control Unit front panel and telex/DSC operation may now be tested.
Installation of Master Oscillator
Higher frequency stability is obtained by installing a different type of Master Oscillator. To install a
new Master Oscillator remove the cover of the Transceiver Unit and unplug the ribbon cables and
the coaxial cables from the Synthesizer Board 911. Loosen the two screws of the module and
remove it. Locate the shielding box on the PCB containing the Master Oscillator. Remove the box
lid and exchange Master Oscillators. Reassemble the Transceiver in the reverse order.
CONNECTORS FOR EXTERNAL EQUIPMENT INSTALLATION
TRP 9250 TECHNICAL MANUAL 3-27