Elettronika S r l TXUP500 500 Watt Analog TV Broadcast Transmitter User Manual APT159B AUTV 500LD Rev0 Date190105 p65

Elettronika S.r.l. 500 Watt Analog TV Broadcast Transmitter APT159B AUTV 500LD Rev0 Date190105 p65

Users manual Part 1

AUTV/500LDLDMOS - UHF TV Solid State AmplifierUsers manual CODE: APT159B TITLE: AUTV/500LD REV: 0 DATE: 19/01/05
SS 96 Km 11370027 Palo del Colle (Ba) ITALYTel. +39 (0)80 626755Fax +39 (0)80 629262E-mail: elettronika@elettronika.itWeb site: http://www.elettronika.itRegistration number: IT-17686Registration number: IT-24436
IndexIndex ................................................................................................................................... 3Warning .............................................................................................................................. 5Warranty ............................................................................................................................. 6Introduction ....................................................................................................................... 7Content of the manual....................................................................................................... 7Treatment of electrical shock ........................................................................................... 9First-aid ......................................................................................................................... 10 Treatment of electrical burns .......................................................................................... 10 Note ............................................................................................................................... 10Section 1 - Information .................................................................................................... 13 1.1 Description ............................................................................................................... 14 1.2 Technical characteristics.......................................................................................... 15Section 2 - Installation ..................................................................................................... 17 2.1 Operating environment ............................................................................................ 18 2.2 Preliminary operations ............................................................................................. 18 2.3 Telemeasuring socket connections ......................................................................... 19 2.4 RS232, RS485 and AGC Socket connections ......................................................... 19 2.5 Preventive maintenance .......................................................................................... 20 Front panel .................................................................................................................... 21 Rear panel ..................................................................................................................... 22Section 3 - Operation....................................................................................................... 23 3.1 Operation ................................................................................................................. 24 3.2 Display ..................................................................................................................... 25 3.3 Menu ........................................................................................................................ 25 - RF Powers ................................................................................................................ 27 - Power Supply ........................................................................................................... 27 - Log/Alarms ............................................................................................................... 27 - Working timer ........................................................................................................... 28 - Thresholds ............................................................................................................... 28 - RMS/Peak................................................................................................................ 29 - Date/Time ................................................................................................................ 29 - Display ..................................................................................................................... 29 - Frequency (only for FM Amplifiers) .......................................................................... 30 - Slave address .......................................................................................................... 30 - Remote .................................................................................................................... 30
- Interlock.................................................................................................................... 30 - Firmware release ......................................................................................................31 - Serial number .......................................................................................................... 31Section 4 - Diagram ......................................................................................................... 33 Cable diagram ...............................................................................................................34 APT159A AUTV/500LD Power Supply Section ............................................................. 35 APT159A AUTV/500LDRF Section ............................................................................... 36 APT159A AUTV/500LD Lateral View ............................................................................ 37 MTF0083AR0 Amplifier module - Component list ........................................................ 38APT159B AUTV/500LD - Component list ......................................................................... 39 SCH0192AR0 (200W UHF LDMOS Amplifier module) ................................................ 41 - Calibration procedure............................................................................................... 42 SCH0259AR0 (RF Amplifier interface) .......................................................................... 50 SCH0223AR1 (Control board and display) ................................................................... 52 - Description ............................................................................................................... 52 - Power Supply ........................................................................................................ 53 - Connectors ........................................................................................................... 53 - Firmware update.......................................................................................................58 SCH0288AR1 (Amplifier interface)................................................................................ 69 SCH0265AR0 (Mains distribution board) ...................................................................... 71 E0012 (SP500-27-DI Switching power supply) ............................................................... 73 06673 (UHF Bandpass filter CL3NL6 - 500W, 3 Sections + 2 Notches) ........................ 76
5WARNINGThe apparatus described in this manual has been designed and manufactured with devices to safe-guard the users. In any case it is recommended that during any operation of installation, maintenance,miscellaneous interventions and calibrations requiring the apparatus to be switched on,THE USER TAKES ALL THEPRECAUTIONS AGAINST INCIDENTSIt is required to use the proper clothes and protection gloves in order to prevent damages from inci-dental contacts with high-voltage parts.The manufacturer declines every responsibility in case the recommendations above are not followed.IMPORTANTThe component lists attached to the relevant electrical diagrams indicate for each item the reference,the description and the type normally used.The Elettronika S.r.l. though reserves the right to use or supply as spare parts components withequivalent characteristics but of a different type, assuring anyway the optimal work of the apparatusin accordance with the specifications.The enclosed monographs are solely owned by Elettronika S.r.l.The use of anything enclosed in this technical manual without explicit authorization given by ElettronikaS.r.l. will be prosecuted by the law.The data and technical characteristics of the apparatus described in this manual are not compelling forthe manufacturer.The Elettronika S.r.l. reserves the right to make, without previous notice, modifications or updates inorder to improve the quality of the product.The general conditions of supply and sale are described in the contracts.The delivery time are in accordance with the products and quantities ordered.
6Summary of warrantyWe, ELETTRONIKA S.r.l., SS096 Km 113 Z.I. PALO DEL COLLE (BA) ITALY, warrant to the ORIGINAL PURCHASER of a NEW product, for aperiod of one (1) year from the date of purchase by the original purchaser (the warranty period) that the new ELETTRONIKA product is free of defectsin materials and workmanship and will meet or exceed all advertised specifications for such a product. This warranty does not extend to any subsequentpurchaser or user, and automatically terminates upon sale or other disposition of our product.Items excluded from this ELETTRONIKA warrantyWe are not responsible for product failure caused by misuse, accident, or neglect. This warranty does not extend to any product on which the serialnumber has been defaced, altered, or removed. It does not cover damage to loads or any other products or accessories resulting from ELETTRONIKAproduct failure. It does not cover defects or damage caused by use of unauthorized modificstions, accessories, parts, or service.What we will doWe will remedy any defect, in material or workmanship (except as excluded), in our sole discretion, by repair, replacement, or refund. If a refund iselected, then you must make the defective or malfunctioning component available to us free and clear of all liens or other encumbrances. The refund willbe equal to the actual purchase price, not including interest, insurance, closing costs, and other finance charges less a reasonable depreciation on theproduct from the date of original purchase. Warranty work can only be performed at our authorized service centers or at our factory. Expenses inremedying the defect will be borne by ELETTRONIKA, including one-way surface freight shipping costs within the United States. (Purchaser must bearthe expense of shipping the product between any foreign country and the port of entry in the United States and all taxes, duties, and other customs fee(s)for such foreign shipments).How to obtain warranty serviceYou must notify us of your need for warranty service not later than ninety (90) days after the expiration of the warranty period. We will give you anauthorization to return the product for service. All components must be shipped in a factory pack or equivalent which, if needed, mayDesclaimer of consequential and incidental damagesYou are not entitled to recover from us any consequential or incidental damages resulting from any defect in our product. This includes any damageto another product or products resulting from such a defect.Warranty alterationsNo person has the authority to enlarge, or modify this warranty. The warranty is not extended by the lenght of time for which you are deprived ofthe use of the product. Repairs and replacement parts are provided under the terms of this warranty shall carry only the unexpired portion of thiswarranty.Design changesWe reserve the right to change the design of any product from time to time without notice and with no obligation to make corresponding changes inproducts previously manufactured.Legal remedies of purchaserThere is no warranty which extends beyond the terms hereof. This written warranty is given in lieu of any oral or implied warranties not containedherein. We disclaim all implied warranties, including without limitation any warranties of merchantability or fitness for a particular purpose. No actionto enforce this warranty shall be commenced later than ninety (90) days after expiration of the warranty period.Warranty for electronic tubesThe warranty applied for electronic tubes is the one given by the manufacturer of the tube. In the event that the product shows anomalies within thedeadline of the validity of the warranty given by the manufacturer of the product itself, the buyer will have to return it to the seller with the neededdocuments and the written description of the defect. The seller will ship the broken tube to the manufacturer in order to effect the necessary technicaltests to find out the cause of the anomaly. Meanwhile the buyer of the tube who needs to use, and as such to replace immediately the product, will haveto buy a new one and provide to the relevant payment, further to the issuing by the seller of a regular commercial invoice. After the adequate tests madeby the manufacturer, should the result be positive, that is confirm the defect in manufacturing, the seller will issue a regular credit note in the name ofthe buyer and return the amount paid. Should the result be negative, that is detect a negligence in the installation or use by the buyer, he will have noright against the seller.Warranty
7INTRODUCTIONThe apparatus described in this manual is the latest of this series, offering high performances, remark-able reliability and a wide range of characteristics, it all at a low cost.Its is easy to install and use. It only takes to follow the installation procedure as shown in this manual:after having removed all from the package, you only have to follow step by step the description in thevarious sections.Before starting to use the apparatus, remember to:read carefully the general safety information contained in this section;follow the instructions for the installation and set up of the apparatus;read all the remaining sections of this manual in order to know well the apparatus and learnhow to obtain the best of its characteristics.CONTENTS OF THE MANUALThe chapter composing this manual contain all the information concerning the use of the apparatus.For more information refer to ELETTRONIKA S.r.l.This manual is made up of different chapters, each made up of various sections. Each individualchapter represents a single apparatus composing the whole station.
8WARNING!The currents and voltages in this equipment are dangerous!Personnel must at all times observe safety regulation!This manual is intended as a general guide for trained and qualified personnel who are aware of thedangers inherent in handling potentially hazaedous electrical and electronic circuits.It is not intended to contain a complete statement of all safety precautions which should be observed bypersonnel in using this or other electronic equipment.The installation, operation, maintenance and service of this equipment involves risks both to personneland equipment, and must be performed only by qualified personnel exercising due care.Elettronika S.r.l. shall not be responsible for injury or damage resulting from improper procedures orfrom the use of improperly trained or inexperienced personnel performing such tasks.During installation and operation of this equipment, local building codes and fire protection standardsmust be observed.WARNING!Always disconnect power before opening covers,doors, enclosures, gates, panels or shields.Always use grounding nsticks and short out highvoltage points before servicing. Never makeinternal adjustments, perform maintenance orservice when alone or when fatigued.Do not remove, short-circuit or tamper with interlock switches on access covers, doors, enclosures,gates, panels or shields.Keep away from live circuits, know your equipment and dont take chances.WARNING!In case of emergency ensure that power has been disconnected.
9A - AIRWAYIf unconscious, open airway lift up neck, pushforehead back, clear out mouth if necessary,observe for breathing.Treatment of electrical shock1) If victim is not responsive follow the A, B, Cs of basic life support.PLACE VICTIM FLAT ON HIS BACK ON A HARD SURFACEB - BREATHINGIf not breathing, begin artificial breathing. Tilthead, pinch nostrils, make airttght seal, 4 quickfull breaths. Remember mouth to mouth resuscita-tion must be commenced as soon as possible.C - CIRCULATIONCheck carotid pulse. If pulseabsent, begin artificial circulation.Approx. 80sec.: 1 rescuer, 15 compressions, 2 quick breaths.Approx. 60sec.: 2 rescuers, 5 compressions, 1 breath.NOTE: DO NOT INTERRUPT RHYTHM OF COMPRESSIONS WHENSECOND PERSON IS GIVING BREATH.Call for medical assistance as soon as possible.
102) If victim is responsive:- keep them warm;- keep them as quiet as possible;- loosen their clothing (a reclining position is recommended).FIRST-AIDPersonnel engaged in the installation, operation, maintenance or servicing of this equipment are urgedto become familiar with first-aid theory and practices. The following information is not intended to bea complete first-aid procedure, it is brief and is only to be used as a reference. It is the duty of allpersonnel using the equipment to be prepared to give adequate Emergency First Aid and thereby pre-vent avoidable loss of life.TREATMENT OF ELECTRICAL BURNS1) Extensive burned and broken skin.- Cover area with clean sheet or cloth (cleansed available cloth article);- do not break blisters, remove tissure, remove adhered particles of clothing, or apply any salve orointment;- treat victim for shock as required;- arrange transportation to a hospital as quickly as possible;- if arms or legs are effected keep them elevated.NOTEIf medical help will not be available within an hour and the victim is conscious and not vomiting, givehim a weak solution of salt and soda: 1 level teaspoonful of salt and 1/2 level teaspoonful of bakingsoda to each quart of water (neither hot or cold).Allow victim to sip slowly about 4 ounces (half a glass) over a period of 15 minutes.Discontinue fluid if vomiting occurs (do not give alcohol).2) Less severe burns - (1st & 2nd degree).- Apply cool (not ice cold) compresses using the cleansed available cloth article;- do not break blisters, remove tissue, remove adhered particles of clothing, or apply salve or ointment;- apply clean dry dressing if necessary;- treat victim for shock as required;- arrange transportation to a hospital as qickly as possible;- if arms or legs are affected keep them elevated.
11LDMOS - UHF TV AMPLIFIERAUTV/500LDUsers manual
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13_______________________________________________________________________________________________Section 1 - InformationContents:1.1 Description1.2 Technical characteristics
141.1 DESCRIPTIONThe AUTV/500LD is an amplifier operating into Band IV-V for common amplification process of the Visionand Sound carriers.The amplifier has been designed to offer to the customer high performances, high reliability and greater simplicityin his operation and maintenance procedures.The amplifiers modules employ all solid state LDMOS technology in order to obtain high gain, wide-bandperformances, very good linearity, reliability and high efficiency.The equipment design allows the soft degradation (RF power loss) for several transistor faulty: in fact theoutput combiner uses RF power resistors for unbalancing power dissipation. The unit is enclosed in a cabinetfor 19- 6U rackmounting.AUTV/500LDLDMOS - UHF TV AMPLIFIER
151.2 TECHNICAL CHARACTERISTICSRFFrequency range 470 - 860MHzOutput power 500W PEPVideo/Sound power ratio 10/1Out stage technology Solid State LDMOSVision-Sound amplification CommonI.M.D. (-8, -10, -16dB) Better than -54dBStandards G, K, NSpurious and harmonics level In compliance with CCIR rec.RF Output impedance 50WRF Output connector 7/16GENERALPower supply 230Vac, ±10%, 50/60Hz400Vac 3P+N (on request)Power consumption 1400VA at black levelRS232 Socket DB9 Connector (on front panel)RS485 Socket DB9 Connector (on rear panel)Telemeasuring socket DB9 Connector (on rear panel)AGC Socket DB9 Connector (on rear panel)Power factor > = 0.9Ambient temperature -5° to +45°CRelative humidity 20% - 90%Altitude Up to 2.500 metersCooling Forced airCabinet Rack 19-6UWeight 60kgPROTECTION THR.FWD Power 600WREF Power 50WTemperature 75°CIDC 25AVDC Min 10V - Max 33,5V
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17_______________________________________________________________________________________________Section 2 - InstallationContents:2.1 Operating environment2.2 Preliminary operations2.3 Telemeasuring socket connections2.4 RS232, RS485 and AGC socket connections2.5 Preventive maintenance- Front panel- Rear panel
182.1 OPERATING ENVIRONMENTYou can install the apparatus in a standard component rack or on a suitable surface such as a bench or desk.In any case, the area should be as clean and well-ventilated as possible. Always allow for at least 2 cm ofclearance under the unit for ventilation. If you set the apparatus on a flat surface, install spacers on the bottomcover plate. If you install the apparatus in a rack, provide adequate clearance above and below. Do not locatethe apparatus directly above a hot piece of equipment.2.2 PRELIMINARY OPERATIONSCorrect installation of the equipment is important for maximum performance and reliability. Antenna and earthconnections must be installed with the greatest care. The equipment adjustment isnt need, because the unit iscompletely adjusted by our technical staff. This is the installation procedure:1. connect the power supply cable of the exciter to the auxiliary socket on the rear panel of the amplifier;2. connect the power supply cable of the amplifier to the electric network (230VAC). If there is the IsolatorTransformer, the amplifier is provided with cable and plug;3. connect the exciter / antenna cables respectively to the RF IN and RF OUT on the rear panel of theamplifier.WARNING!!!FOR ELECTRICAL SAFETY REASONS AND IN ORDER TO KEEP THE APPARATUS SAFE,THE GROUND TERMINAL OF THE APPARATUS MUST BE CONNECTED TO THE EXISTINGGROUNDING SYSTEM AND NOT BY USING THE SHIELD OF THE OUTPUT COAXIAL CABLE.13Mono-Phase cabling21 = L2 = L3 = N4 = N5 = GND
19When the apparatus is put within a combined system it is directly connected to the input splitting and outputcombining systems.Before fully powering the apparatus, check that the output connections of the coaxial cable to the antennasystem are working.In order to this it is possible to check the indication of the reflected power at low power levels. Only if theSWR indication on the display is 0, the output power can be slowly increased. At maximum output power,some watts might be shown as reflected power.2.3 TELEMEASURING SOCKET CONNECTIONSDB9 Socket2.4 RS232, RS485 AND AGC SOCKET CONNECTIONSPIN N° SIGNAL TYPE IN / OUT FUNCTION1 Analog Output FWD Power2 Analog Output REF Power3 Digital Output Temperature4 Digital Input Interlock5GND - -6 - 7 Digital Output Free contact (closed when alarm)8 Digital Input 0V = ON5V = Normal9 Digital Input 0V = OFF5V = NormalPIN 123456789FUNCTIONS -TxDRxD-GND----RS232 - DB9 SocketPIN 123456789FUNCTIONS -Rx-Rx+5VGND-Tx-Tx+-RS485 - DB9 Socket
20AGC - DB9 SocketPIN N° SIGNAL TYPE IN / OUT FUNCTION1GND - -2 Digital Output 0V = Normal5V = AGC Alarm3 Digital Output 0V = Normal5V = AGC Alarm8 Analog Output FWD Power9 Analog Output FWD Power2.5 PREVENTIVE MAINTENANCETo ensure maximum performance and minimum repair trouble, we strongly recommend you to follow thebelow stated headlines for preventive maintenance:1. check antenna installation and ground connection at regular intervals;2. keep your apparatus clean and dry externally: this will ensure continuous functioning of the front panelcontrols;3. if the apparatus has not been used for a long period of time combined with exposure to extreme environ-mental conditions, open the unit and make a visual inspection.Remove salt, water or ice with a moist cloth before turning the apparatus on. Check that the cooling fans arerunning freely.4. for general maintenance and top performance, call an authorized service technician to give the apparatusand the complete antenna/earth connection installation a general check every 12-18 months;5. check at regular intervals that the air intake located on the front panel is free of dust. If there is visible dust,remove it by means of a soft brush.
21Front panel123456DESCRIPTION1LCD Display2 Function keys3 Status LEDs4 RF Monitor connector5 Main switch6 RS232 Socket
22Rear panel123498DESCRIPTION1 Breaker2 Power supply socket3 Auxiliary socket4Fuse5 RS485 Socket6 AGC Socket7 Telemeasure socket8 RF Input connector9 RF Output connectorGNDDRIVER - 5ACONTROL - 1A5 6 7
23_______________________________________________________________________________________________Section 3 - OperationContents:3.1 Operation3.3 Display3.4 Menu
243.1 OPERATIONAt startup, after initial image, the display shows the main screen with the RF powers as in Figure 1:The user may turn on and off the amplifier by means of the switch on the front panel. The control board turnson all the power supplies, the exciter (if any), and internal cooling fans. While the amplifier is working, themicro-controller monitors continuously the most important parameters: power supply voltages, absorbedcurrents, high power zone temperature, forward and reflected powers, unbalances (if any). Each measure isassociated to a maximum threshold beyond which the amplifier is immediately put in protection status byturning off one or more power supply, depending on the failed block. In order to prevent a temporary problemto trigger a definitive protection status, the failed block is turned on again, after some seconds, for up to fivetimes. If it goes beyond the protection threshold for more than five times, it is declared as FAILED and it willno longer be turned on. In this case, the amplifier will have to be turned off manually by means of the switch onthe front panel, then turned on again after performing the needed maintenance.On the front panel there are also three LEDs labelled ON, REMOTE and ALARM. Their meanings areexplained in Table 1.Figure 1: Main screenTable 1: Meanings of the three LEDs on the front panel1 Screenshots in this manual are indicative, so they can be different from those on your equipment.LED COLOUR MEANING MEANING WHEN BLINKINGON Green The amplifier is onThe amplifier has been turned onlocally but it has been turned off byremoteREMOTE Yellow Remote control isenabled It never bli nksALARM Red An alarm is present It never blinks
253.2 DISPLAYThe control board is provided with a modern pixels graphic display with blue background. Normally it alwaysshows a title bar (on the top line) and a status bar (on the bottom line).The title bar, see Figure 2, shows the name of the amplifier (TV Amplifier) and the current time. If the amplifieris a single unit coupled externally with other units in a high power transmitter, the title bar shows the amplifiernumber (slave address) too.Figure 2: Title barFigure 3: Status BarThe status bar (Figure 3) indicates the forward and reflected powers and the temperature. It also contains twosymbols for the interlock (lock) and the alarm (bell).The bell symbol is continuously displayed in case of alarm. It blinks if there has been an alarm which has endedbut has not yet been seen by the user. It stops blinking once the Log has been checked.The interlock symbol is displayed only when this function is enabled. It may be either a close lock, as in Figure3, when there is no alarm (interlock chain closed) or an open lock in case of alarm (interlock chain open).Since the status bar is always showed on the display, regardless of the screen, the user may monitor at anytime the most important parameters and the presence of alarms while moving between different screens.3.3 MENUSThe user may see or modify locally some configuration parameters using the four buttons on the front panel.All screens areorganized in a hierarchical menus and the user may move between them in a simple and intuitiveway.To see the menu its sufficient to press the ESC key (see Figure 4).
26Figure 4: Main menuThe display only shows three items at a time: all the items can be scrolled by the UP and DOWN arrow keys.Any item can be chosen by selecting it and pressing the RET key. Menu entries with an arrow on the right open sub-menus when chosen. Thus there is a hierarchical structure as in Figure 5. To go back from a sub-menu to the previous menu, press the ESC key. If the ESC key is pressed in the main menu, the RF powersscreen is accessed.Figure 5: Hierarchical menu structureAll menu items are described in detail below.
27- RF PowersThis is the main screen showing the RF powers of the amplifier: forward power, reflected power, unbalances,if any. For forward power a level bar is displayed. See an example in Figure 1.- Power SupplyThis screen shows all the signals coming from two power supply. To check the next (previous) power supplypress the UP (DOWN) key. For each power supply, the voltage, the absorbed current and the status (ON orOFF) are shown.Figure 6: Power supply screen- Log/AlarmsThe control board is provided with an external EEPROM and a clock. Any alarm or switching event with thetime at which it occurred is saved in the EEPROM. The Log/Alarms sub-menu allows to manage this log.It is possible to see the events stored in the log by selecting Log/Alarms View Log/Alarms. All eventscan be scrolled by pressing the UP and DOWN keys. For example, the event shown in Figure 7 is the turningon of the amplifier by means of the local switch. For every event/alarm a short description and the date andtime at which it occurred is displayed.Figure 7: Event stored in the log
28In case of alarm, the value of the measure which caused the alarm is saved into the log. In case of alarm stillexisting after five turning-on attempts, the parameter is marked as FAILED. Table 2 is the list of all the eventswhich can be logged.Table 2: Events managed and logged by the control boardThe log may be completely deleted by selecting Log/Alarms Clear Log/Alarms.Amplifier can store in the log details about alarms and generic events. You can change this behaviour selectingLog/Alarms Log/Mode menu item.- Working TimerThe control board has a working timer which is always enabled while the amplifier is working (i. e. there is atleast one power supply working). The menu entry Working Timer View Timer allows to check the hoursfor which the timer has been enabled. Working Timer Timer Reset resets the timer.- ThresholdsThis is a screen showing the alarm threshold of each signals monitored by the control board. The list can bescrolled by means of the UP and DOWN keys.EVENT DESCRIPTIONLocal ON Amplifier turned on by means of the local switchLocal OFF Amplifier turned off by means of the local switchRemote ON Amplifier turned on remotelyRemote OFF Amplifier turned off remotelyInterlock open Interlock chain openInterlock closed Interlock chain closedPower Supply ON Power supply onFwd Pwr xxxxW Alarm for forward powerRef Pwr xxxxW Alarm for reflected powerUnbY xxxxW Unbalancing alarmV1 xx.xV Power supply voltage alarmI1 xx.xA Power supply current alarm
29- RMS/PeakThe control board can monitor both the RMS and peak powers, the first used in digital systems. The menuentry Settings RMS/Peak allows to choose the power to be displayed and monitored. This menu ispresent only in certain amplifiers.- Date/TimeThis screen allows to set the current date and time. The setting is changed by pressing the arrow keys, thenpressing the RET key to move to the following value and eventually save the changes. To go back to theprevious menu and discard any change made, press the ESC key. Figure 8 shows an example of this screen.Figure 8: Date and time setting screen- DisplayThe menu entry Settings Display allows to change some settings of the display, such has back light,contrast and screensaver. The back light and the contrast are set by means of the UP and DOWN arrowkeys. The changes made are saved by pressing the RET key or discarded pressing the ESC key. Figure 9shows an example of this screen.With Settings Display Screensaver you can set an interval time after which display backlight isturned off. When display backlight is off, press any key to switch it on.Figure 9: Display contrast setting screen
30- Frequency (only for some Amplifiers)The forward and reflected RF powers is measured by means of a directional coupler. In order to compensatefor the effect due to the sampling made by the coupler, it is possible to set the frequency by menu entrySettings Frequency. The setting can be changed by pressing the arrow keys. The changes made aresaved by pressing the RET key or discarded pressing the ESC key. Set the video carrier frequency.- Slave AddressThe amplifier may be used either in stand-alone mode or as a slave of a master in a high power multiple unitstransmitter. In the latter case an unique address for each amplifier has to be specified, in order for all of themto communicate with the master on the same RS485 bus. The menu entry Settings Slave Addressallows to choose the stand-alone mode or set a slave address by means of the UP and DOWN arrow keys.The changes made are saved by pressing the RET key or discarded pressing the ESC key. An example of thisscreen is shown in Figure 10.Figure 10:Slave address setting screen- RemoteThe amplifier may be controlled either locally, by means of the keys and display, or remotely. There are threepossibilities for remote control:- using a direct serial connection between amplifier RS232 connector and a PC RS232;- using the remote control device manufactured by Elettronika S.r.l. (RCU), on the RS485;- using a general-purpose control system connected to telemeasures.You can enable / disable remote control choosing menu item Settings Remote. When remote controlis enabled, the yellow REMOTE LED on the front panel is lit.- InterlockOne of the pins of the telemeasure connector, located on the rear panel, is used for the interlock alarm. It is aninput line which turns off the amplifier in case of alarm. The interlock check can be enabled or disabled using
31menu item Settings Interlock. When it is enabled, the status bar shows the lock symbol (see Figure 3),which is close if the interlock chain is closed (no alarm) or open if it is open (alarm).- Firmware ReleaseThe menu entry Settings Firmware Release allows to display the firmware version number and thehardware release of the amplifier.- Serial NumberThe menu entry Settings Serial Number allows to display the serial number of the apparatus.
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