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PJ5KPS
49 / 80
User & Technical Manual
Rev. 1.5 - 08/02/06
7.3.6 Replacing the carriage
The following procedure has to be followed when it's necessary to replace a power
supply carriage. Please note that if the transmitter is fitted with just one power supply
carriage, it will be necessary to switch it off to replace the carriage, while if it has two
of them it is possible to continue transmitting normally also during this operation.
1 Turn the power disconnecting switch on position 0(in the case of one power supply
carriage)
2 Turn the carriage switch on position Off
3 Disconnect the threephase supply connector from the carriage, the connector of
the control signals and the one of the command contactors .
4 Remove the screws that hold the bottom bar of the rack
5 Remove the carriage from its site
6 Insert the new carriage
7 Reassemble the bar and fix it in place with the screws
8 Reconnect the three connectors
9 Turn again the power disconnecting switch on position I
10 Turn the power switch on position I (if it had been turn Off previously)
7.4 RF Modules amplifier
The PJ5KPS has five RF amplifier modules able to supply 1.2 kW each. The modules
are independent from each other, self-controlled and self-protected.
Each amplifier module includes a first stage with a variable gain , based on the
MOSFET BLF175. The RF signal amplified by the driver is splitted in 4 by a Wilkinson
splitter, then sent to 4 identical modules based on BLF278, combined again and
filtered by a band-pass filter.
RF in
80 Vdc
Splitter
Coupler
Power
supply
RF Out
RS485
Phase Adj.
φφ
μ
C+bias
Vpa
Manual
Power adj.
Vgate
Figure 7-21
Block diagram of a RF module
Summary of Contents for PJ5KPS
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