Operation Manual Part 3

Digital Liquid Cooled UHF
TV Equipment
Description / Test points / Location of units
9946 V1
45321648.01 104 A E
preliminary
88 / 131
Numéro / Number Doc. Rev. Lan
g
u.
16/06/2006
Pa
g
e
Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON.
3.10.8. Power input
The amplifier is powered with DC voltage from an amplifier power supply. One of the incoming voltage
power connectors J1 or J6 is connected to the input power connector, J1 or J6, on the back of the
amplifier.
The amplifier is also fed by a +5 V supply from the multiplex card on the connector J106/J107, this is
only used if there is a problem with the +5 V supply provided by the protection and interface card.
3.10.9. Connections and data transfer
The amplifier has the following connectors :
♦ on front panel :
• connector J1, amplifier RF output test point,
• two self-locking hydraulic connector,
♦ on rear panel :
• coaxial connector J2, RF output signal,
• coaxial connector J104, RF input signal,
• input power supply connector for the DC incoming feed,
• connector J106/J107, for connections with the rest of the transmitter;
the main signals are as follows :
- amplifier status data :
VSWR fault,
overdrive fault,
temperature fault,
power supply fault,
amplifier presence,
amplifier fault,
transistor current values and AGC information
- amplifier command data :
reset command for vswr protection system and current and
temperature protection systems, on/off command,
- 5 V supply from the multiplex card.
3.10.10. Cooling
The amplifier has a cooling circuit. The cooling liquid from the transmitter system enters via a self-
locking connector on the amplifier, circulates through the power amplifier heat exchange system and
exits via a second connector; both connectors are on the amplifier front panel.
3.10.11. Transportability
The amplifier weighs 19 kg and it is necessary to take precautions when moving it. It has a handle on
the front panel which is used to extract it from its housing in the bay. For transportation purposes it has