MILT.
FES HT RH nao ang TR iT sore a Sra HII: Es sgn Se v
The module contains the following blocks: Input relay — chooses the video source between the BNC on the front panel of the module and the one on the back of the apparatus; the switching is managed by the software.
peak with a modulation depth of 90% at white level. 13. Vestigial SAW filter — filters the double side-band to the broadcast carrier in order to obtain a vestigial modulation (the upper side-band is partially broadcast). 14. IF Amplifier — performs the amplification after the vestigial filtering and sums the audio subscribers) coming from the audio modulator module (see MTGO071/78). 15. Output low pass filter — filters the presence of harmonics of the audio and video carriers. 16.
Description of the adjustment points R71 White clipper level R92 Level of the video signal in base band {0dB on dig.
Component layout for adjustment points cap ere anal BO sin [Gan wen] a in mf mmm mm “moroseness, 73
The calibration procedure of the module requires a complete structure of display board (see MTG0079) and extension module (see MTGO093) in order to perform the software selection which will be referred to later and power the module itself. Menu of the Multi standard Video Modulator Module YER YD R9:06 | [VEGA Y10 $9:05 203 & LLL HBR ua EN LL POSSE EEN Video FL.J%, (1W;| [Video 20.3%; G.
Q Calibrate C113 and L5 to lock the video carrier to the intermediate frequency of the set standard (to change the standard refer to the standard change procedure) and obtain a lock voltage between 7¥ and 8V on J6 checking that Fido is on Lock in the display menu. 0 In case of problems in obtaining the lock, check that on J4, J7 and J9 there are the frequencies listed in the table of the description of the adjustment points.
MILT. IF CORRECTOR MODULE MTGO073AR0 DESCRIPTION The non-linearity IF per-correction is performed by twe distinct stages which act on different characteristics of the signal. The first stage works on ICBM and differential phase and gain (GDP) of the video signal, which are small signal characteristics and thus need a preconception based on “adapted” filtering cells.
The module contains the following blocks: 10. 11. Input amplifier — DE-couples the input of the module from the internal per-correction sections. Input/output relay — inserts or excludes the per-corrector from the IF chain with the timing needed to avoid power overshoot due to the internal AGC stages; the switch is handled by the software and signaled by a yellow LED on the frontal panel.
The calibration procedure of the module requires a complete structure of display board (see MTG0079) and extension module (see MTGO095) in order to perform the software selection which will be referred to later and power the module itself.
0 Configure the module with Rec enabled. UO Calibrate R123 to an IF level of 0dBn on R178 and calibrate R126 to an IF level of -DBMS on J10 with the tracking on -DBMS. {1 Check that the passing band of the section is similar as the one in Fig.6 and able to cover the whole IF band from 30M Hz to MHz. Verification of the module without per-correction — connect a spectrum analyses with tracking between J3 and J10 and check the sections therein: 0 Configure the module with Rec disabled.
The listing procedure of the linearity per-corrector is the consequence of a series of subsequent interventions on the per-corrector cells in order to achieve a good compromise of the video parameters of the amplifier at the working power. A calibration technique for the cells allowing to satisfy these requirements is proposed below; the choice of the good compromise on the video parameters is anyway entrusted 10 the skill of the tester.
the compensation has to be found, then the figure reproducing the measure in a ‘secular’ way is to be considered. In the uncatalogued there are also the positions of the trimmers and the jumpers to obtain all proposed configurations, of course intermediate solutions are possible and the intensity of all solutions may be scaled by means of the level trimmer which is considered to be at the maximum intervention in the uncatalogued.
MILT. UHF LOCAL OSCILLATOR MODULE MTGO084ARG DESCRIPTION The synthesis system of the local oscillator for the channel conversion is based ona control technique which allows to obtain the programming of the standard, the channel (split into the three bands 1, 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.
The module contains the following blocks: 1. 2 Local oscillator — generated the carrier to be synthesized, it is split into three windows band) to ensure the coverage of all of the TV channels to be implemented for all standards. Radio-frequency splutter —splits the signal coming from the local oscillator by means of splutters and amplifiers, with 10dB attenuation and gain respectively, to ensure the complete isolation of the LO from the other stages and to minimize the * frequency pulling” phenomenon.
Description of the adjustment points €1,C2,C3 Tuning of the local oscillator (SCH0202 0309 0310) J3 LO input J5,J8 RF link (absent in case of LO configuration) J4 LO monitor {panel} JP1 Unused J2 Test point for the debug of the PLL The calibration procedure of the module requires a complete structure of display board (see MTG0079) and extension mode (see MTGO093) in order to perform the software selection which will be referred {0 later and power the module itself.
MILT, UHF CHANNEL FILTER MODULE MTGO075AR0 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.
Description of the adjustment points €1-C8, C18-19 | Channel filter calibration for bands land M-V Li6 Channel filter calibration for band II Channel filter calibration for band I Je RF monitor (panel) JP1, R29 Local gain control of the fitter J2 Channel filter input J4 Channel filter output The calibration procedure of the module requires a complete structure of display board (see MTGO079) and extension module (see MTGO095) in order to perform the software selection which will be referred to later and powe
CONTROLLER MODULE MTGO079ARG SCHOLARSHIP DESCRIPTION The Controller module, located on the right side of the VEGA TV modulator, is the user interface of the whole modulator.
LED The board is provided with three LED. On (green): iris lit when the exciter is switched on by local or remote control. Remote (yellow): iris lit when the exciter bas 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.
« Upgrade of the BIOS of the display board: While the exciter is off, set the dip-switched of the board on these positions DIPHTHONG 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 DIPHTHONG.
Component layout SCHOOLROOM Bot layer odd 0 i] ror] {OR i [an Fhe Tog dba; a0 J Baa ole Bir Component layout SCHOOLGIRL Top layer peke] 108
SCHOLARSHIP DESCRIPTION The power supply accepts a nominal continuous input voltage of 28 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 and -15V voltages.
AL REFERENT MODULE MTGO076AR0 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 telemarketing connectors and the RS485, the external reference input (or output) and the IF connection before the linearity per-corrector, in order to allow the insertion in the chain of different modulation systems such as NI CAM.
The module contains the following blocks: 1. Input and output buffers — DE-couple the internal circuitry from the I/O connectors 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. MHz MHz 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 io later and power the module itself. Menu of the External Referent Module ELH V1.0 ET IF Link 03:01f VEG ¥1.0 09:96 Ethel. POW 0.
BUS STRUCTURE SCHOOLMARM Component layout SCHOOLGIRL Fr ee THT ET BBD BOT ETE CR CI EBB 123