MULT. UHF LOCAL OSCILLATOR MODULE MTG0084AR0 DESCRIPTION The synthesis system of the local oscillator for the channel conversion is based on a control technique which allows to obtain the programming of the standard, the channel (split into the three bands I, III, IV/V) and the line offset (as multiple of the line frequency of the video signal) via software, with no change to be made.
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The module contains the following blocks: 1. Local oscillator generated the carrier to be synthesised, it is split into three windows (I-II / III / IV-V band) to ensure the coverage of all of the TV channels to be implemented for all standards. 2.
- Description of the adjustment points COMPONENT C1, C2, C3 J3 J5, J8 DESCRIPTION Tuning of the local oscillator (SCH0292 - 0309 - 0310) LO input RF link (absent in case of LO configuration) J4 LO monitor (panel) JP1 Unused J2 Testpoint for the debug of the PLL The calibration procedure of the module requires a complete structure of display board (see MTG0079) and extension module (see MTG0095) in order to perform the software selection which will be referred to later and power the module itself..
Component layout for adjustment points 106
Component layout SCH0293AR0 Component layout SCH0292AR0 107
MULT. UHF CHANNEL FILTER MODULE MTG0075AR0 DESCRIPTION The module filters the signal coming from the conversion mixer removing the local oscillator and the upper side-band and contains the voltage-controlled gain stage composed by a pin-diode attenuation cell followed by a wide-band amplification stage used as driver of the final stage. TECHNICAL CHARACTERISTICS Input/output impedance Filter type RF-attenuation type Output amplifier Overall gain 50W R.O.S.
- Description of the adjustment points COMPONENT C1-C8, C18-19 DESCRIPTION Channel filter calibration for bands III and IV-V C17, C20-24, Channel filter calibration for band I-II C26-27, C31-32 L1-6 J6 JP1, R29 Channel filter calibration for band I-II RF monitor (panel) Local gain control of the filter J2 Channel filter input J4 Channel filter output The calibration procedure of the module requires a complete structure of display board (see MTG0079) and extension module (see MTG0095) in order to p
Component layout for adjustment points 110
Component layout SCH0222AR2 Component layout UHF Channel Filter 111
CONTROLLER MODULE MTG0079AR0 SCH0135AR1 DESCRIPTION The Controller module, located on the right side of the VEGA TV modulator, is the user interface of the whole modulator.
- LEDs The board is provided with three LEDs. - On (green): it is lit when the exciter is switched on by local or remote control. The LED is blinking till the power reach his nominal value. - Remote (yellow): it is lit when the exciter has been set to accept remote commands. To have it accept local commands again, the local/remote selection menu can be used. - Alarm (red): shows that an alarm is present. In case of alarm the red LED lights up and the icon of a bell appears in the upper bar of the display.
latter. l Upgrade of the BIOS of the display board: While the exciter is off, set the dip-switched of the board on these positions DIP3:ON DIP4:OFF. Run the Fujitsu Flash MCU programmer application, select the BIOS file to be used, select download and follow the instructions given by the application. Upgrade of the FIRMWARE of the display board: A display board provided with the BIOS is needed. While the exciter is off, set the dip-switched of the board on these positions DIP3:OFF DIP4:ON.
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Component layout SCH0135AR1 - Bot layer Component layout SCH0135AR1 - Top layer 116
SCH0231AR1 DESCRIPTION The power supply accepts a nominal continuous input voltage of 28V and supplies three continuous current output with voltages of +5V, +15V and -15V. It also provides a voltage of +28V to the system bus. The power supply voltages towards the system bus are switched by means of relays controlled by the microprocessor of the control board. There are switching regulators for the +5V, +15V and -15V voltages.
EXTERNAL REFEREMENT MODULE MTG0076AR0 DESCRIPTION The board contains the 5/10MHz external reference and a series of functions on the back of the apparatus: the rear audio and video inputs, the telemeasuring connectors and the RS485, the external reference input (or output) and the IF connection before the linearity pre-corrector, in order to allow the insertion in the chain of different modulation systems such as NICAM. TECHNICAL CHARACTERISTICS Frequency reference Detector presence Connector O.C.X.O.
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The module contains the following blocks: 1. Input and output buffers de-couple the internal circuitry from the I/O conenctors and detect the presence of the reference signal. 2. Direction switch allows the configuration of the BNC as either input or output for the 5/10MHz reference signal. 3. 5MHz O.C.X.O. 5MHz internal reference system (optional), which frequency can be fine-adjusted via software. 4.
The calibration procedure of the module requires a complete structure of display board (see MTG0079) in order to perform the software selection which will be referred to later and power the module itself..
15W UHF AMPLIFIER MODULE Component layout MTF0088BR0 122 MTF0088BR0
Component layout SCH0313BR0 - 15W UHF Amplifier Module 123
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COMPONENT LIST SCH0313BR0 Part Name/Number Description CC 100nF-S 01065C CC 100pF-S 01092 CC 10pF-S 01086 CC 1206 N. M.
Part Name/Number Description Qty. Comps.
Component layout SCH0261AR0 - Interface Board COMPONENT LIST SCH0261AR0 Part Name/Number Description Qty. Comps.
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BUS STRUCTURE Component layout SCH0194AR1 130 SCH0194AR1
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COMPONENT LIST SCH0194AR1 Part Name/Number Description Qty. Comps. CC 100nF-S 01065C 01065C Y5V 1206 COND 19 CC 10nF-S 01053B CC 1206 N. M. CC 47pF-S 01100 CE 220uF50V LOW ESR D 1N4148-S 03002 D 50WQ06FN DL KA-3528SGC 03057 IC LM2593HVS-ADJ IC LM2596S-5.0 IC LM317 04340 IC TL082-S 04796A IC TPS2034D-S IC ULN2003A 4870 IND MS85 10uH-S IND T100uH-1.
SP300-27 SWITCHING POWER SUPPLY E0017 MAIN FEATURES - Universal AC input / Full range - Built-in active PFC function, PF>0.95 - Protections: Short circuit / Over load / Over voltage / Over temp. - Forced air cooling by built-in DC fan - Built-in cooling Fan ON-OFF control - Fixed switching frequency at 110kHz MECHANICAL SPECIFICATION AC/L 2 AC/N 3 FG 4-5 DC OUTPUT -V 6-7 DC OUTPUT +V 32.
TECHNICAL CHARACTERISTICS MODEL OUTPUT INPUT SP300-27 27V 48V RATED CURRENT 11A 6.25A CURRENT RANGE 0 ~ 11A 0 ~ 6.5A RATED POWER 297W 300W 200mVp-p 240mVp-p RIPPLE & NOISE (max.) Note 2 VOLTAGE ADJ. RANGE 26 ~ 32V 41 ~ 56V VOLTAGE TOLERANCE Note 3 ± 1.0% ± 1.0% LINE REGULATION ± 0.2% ± 0.2% LOAD REGULATION ± 0.5% ± 0.5% SETUP, RISE, HOLD TIME 1500ms, 50ms, 20ms at full load VOLTAGE RANGE 88 ~ 264VAC FREQUENCY RANGE 47 ~ 63Hz POWER FACTOR PF>0.95/230VAC EFFICIENCY (Typ.
DERATING CURVE 24~48V 100 12~15V 80 5,7.
