Elettronika TXUP10000LD Istruzioni operative e di manutenzione
TXUP10000LD
LDMOS - UHF TV Solid State Transmitter
General description
CODE: STT028A TITLE: TXUP10000LD REV: 0 DATE: 08/07/05
SS 96 Km 113
70027 Palo del Colle (Ba) ITALY
Tel. +39 (0)80 626755
Fax +39 (0)80 629262
E-mail: [email protected]
Web site: http://www.elettronika.it
Registration number: IT-17686
Registration number: IT-24436
DESCRIPTION
The TXUP10000LD belongs to the High Power UHF products family of Television Transmitters fully in solid
state technology.
The TXUP10000LD series represents the 10kW TV Transmitters operating in the IV/V Band for Common
amplification process (separate amplification available) of the Vision and Sound carriers. This Transmitters
family has been designed to offer to the customer high performances, high reliability and greater simplicity in
their operation and maintenance procedures.
The Vision and Sound signal processing is provided for all TV Standards and all types of Audio applications
(Mono & Dual sound - NICAM) together with colour systems such as PAL - NTSC - SECAM. Thanks to
the amplitude and phase pre-correction circuit, it is possible to cancel the distortions in the output stage, thus
cutting down the operating costs. The RF transposition in the driver is carried out by a synthesizer with various
possibilities of accuracy and stability as well as precision offset locked by internal or external frequency
reference.
The RF amplifier is made up by eight RF modules installed in a power rack, the modules are dedicated for the
Vision and Sound carriers common amplification. The amplifiers employ solid state LDMOS technology in
order to obtain wide band, reliability, and high efficiency. Each RF module has a built-in switching-mode
power supply unit, self-protected against overcurrents and overvoltages, as well as overtemperature and
VSWR for RF parameters. The cooling system is fully contained into the transmitter. The control unit provides
full management of the transmitter without the presence of the operator, the system includes a central controller
and several peripheral units installed in each RF module and rack. The control device includes a fault finding
system to detect equipment malfunctions and locate the faulty subassembly which needs to be replaced. The
interlock circuit is independent on the software and remains always operational whether computer control is
present or not. The operator interface is made by a high resolution LCD graphic display and a simple keyboard,
the menu is very friendly and easy to use.
The Control Unit can be fully controlled in REMOTE mode via link or via modem in RS232 or other interface.
The equipment design allows the soft degradation (RF power loss) for several transistors faults.
- TECHNICAL SPECIFICATIONS
RF SECTION
Frequenchy range ............................................................................................................................................ 470 - 860MHz
Output power ........................................................................................................................................................ 10kW PEP
Audio / Video power ratio ....................................................................................... 10/1 single sound - 20/1/0.2 dual sound
Out stage technology ............................................................................................................................. Solid State LDMOS
Audio / Video amplification ...................................................................................................................................... Common
Standards ................................................................................................................................................................ G, K, I, M
Audio transmission ...................................................................... FM single sound - Dual sound coding IRT - NICAM 728
Harmonics and suppression emission ..................................................................................... In compliance with CCIR rec.
Intermodulation products from audio and video ..................................................................................................... < = 56dB
Frequency stability ......................................................................................................................... 2,5ppm (option 0,05ppm)
VIDEO SECTION
Video input ............................................................................................................................................. BNC 75Ωconnector
Nominal input level .............................................................................................................................................. 1Vpp ±6dB
Return loss ............................................................................................................................................................... > = 30dB
DC Restoration ........................................................................... Clamped to the blanking level without affecting the burst
White limiter ................................................................................. At 90% picture signal without affecting the chrominance
Transmission characteristics
Sideband spewctrum response ....................................................................................................According to the standard
Amplitude frequency response .................................................................................................... According to the standard
Group delay variation without receiver pre-correction and TV demodulator flat ................................................... < = ±35ns
Non linearity distortion (10 to 75% mod.) ................................................................................................................... < = 5%
Differential gain (10 to 75% mod.) ............................................................................................................................... < = 5%
Differential phase (10 to 75% mod.) .............................................................................................................................. < = 5°
Signal to random noise ratio (weighted 0.2 to 5MHz) .............................................................................................. > = 60dB
Blanking level variation ............................................................................................................................................... < = 2%
2T k factor ................................................................................................................................................................... < = 2%
AUDIO SECTION
Nominal input level (±50kHz dev.) ..................................................................................................................... -10 to +8dBm
Input impedance ............................................................................................................................................ 600Ωbalanced
Pre-emphasis .................................................................................................................................................................. 50ms
Transmission characteristics
Amplitude frequency response ............................................................................................................ 40 to 15000Hz ±0.5dB
Total harmonic distortion ......................................................................................................................................... < = 0.5%
FM Signal to noise ratio (referred to ±50kHz dev. f = 400Hz) ................................................................. > = 60dB (weighted)
AM Signal to nokise ratio .......................................................................................................... > = 50dB (referred to 100%)
AM Synchronous modulation ................................................................................................... < = 40dB (referred to 100%)
REMOTE CONTROL
Parallel interface ............................................................................................................................. On/Off, Alarms, Interlock
Serial interface ...................................................................................................... RS232 (Full monitoring and management)
GENERAL
Power supply voltage ....................................................................................................... 230VAC, ±10% (other on request)
Frequency ........................................................................................................................................................ 50-60Hz, ±5%
Temperature operating range .................................................................................................................................. 0 to 45°C
Altitude ............................................................................... Up to 2.500 meters (> = 2.500m with additional cooling system)
Power consumption (cooling system included) .............................................................................. < = 24.5kVA(black level)
Power factor ................................................................................................................................................................ > = 0.9
Cooling .................................................................................................................................................................. Forced air
Dimensions ................................................................................................................................................ n. 2 Rack 19”-42U
AMPLIFIER CONTROL
User’s manual
2
1.1 CONTROL SYSTEM OVERVIEW
The control system is made up by some “Slave” boards, which check locally the amplifier modules, and a
“Master” board to monitor the status of the Slave boards in each module and show on a graphic display all
the checked parameters.
The number of the Slaves changes depending on the output power of the amplifier. The communication
between Master and Slaves is made via RS485 standard. The Master board reads the overall parameters of
the equipment (Forward and Reflected power and Unbalancing), polls (interrogaes in sequence) the local
boards, shows on the display the values requested by the user, indicates alarm conditions, if any, and allows
to change some of the operating parameters of the apparatus. Besides it realizes a serial data interface to an
external system able to analyse the working parameters of the equipment, using the RS232 and RS485
communication protocols.
1.2 FUNCTIONS
At start-up, the display of Amplifier Control module shows an informational message concerning the equipment
and its firmware version.
- Main menu
The main menu has: a list of the amplifier modules, the measure of some parameters of the power in antenna,
a window with icons to show the alarm status (Alarm Status Window) and some general information, that is
date, time, temperature inside the module and, for FM equipment, transmission frequency.
The following picture is an exact representation of the main menu screen.
AMPLIFIER CONTROL
3
if the communication with the slave is correct and then
if the communication with the slave is interrupted
ON
if the amplifier module is OFF
OFF
if the amplifier module is ON
In the Amplifier List, next to each module, the following symbols can be found:
The UP and DOWN arrow keys allow to select one of the slave, the alarm list, or a menu allowing to change
some settings of the control module and the apparatus; the RET key is used to confirm the selection.
In the main and slave menu theAlarm Status Window (which position is indicated by an arrow in the picture
below) is shown: the gate symbol displays the status of the INTERLOCK, in case of alarm this icon blinks
and the buzzer ringgs.
The INTERLOCK signal is a control available to the user to manage an ON/OFF sensor.
When the relevant PIN is grounded, the Master board does not signal any alarm, as soon as the PIN is left
floating, an alarm is detected; the rotating screw symbol shows that the FANS work normally; in case of alarm
this icon blinks and the buzzer rings; the bell symbol appears in case of alarm detected by the control module
or the amplifier. It blinks if the alarm condition is terminated and the alarm itself can be displayed in the Alarm
List.
If one of the parameters of a Slave or any of the ones directly checked by the Master is alarmed, the general
Indice
