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EuroTel ETL0480TBD, Technical Manual

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EUROTEL - ITALY 

 

ETL0480TBD 

III - COMPOSITION OF RF AMPLIFIER ETL0480TBD, 1 kW UHF 

 

• 

RF Amplifier ETL0480TBD comprises two ETL0470 TV RF Power Amplifier Modules, one input 
power divider, one output RF power summer, 50 Ohm balancing load for the hybrid and one 
band-pass filter for the attenuation of harmonic and spurious products. All these parts are 
assembled into a standard 19” cabinet 1540 mm high (28 Units), which also carries two large 
diameter fans for the extraction of hot air. The list of standard parts is as follows. 

 

PARTS SUPPLIED IN THE STANDARD CONFIGURATION 

 

QTY MODEL 

700 W TV RF Power Amplifiers Modules 

2 

ETL0470 

Input power divider gain and phase equalizer 

1 

MOE142 

3 dB Output power summer 

1 

ETL2140TA 

50 Ohm high power balancing load 

1 

MODM299 

Output directional coupler 

1 

ETL2141TA 

Interconnection cables & accessories kit 

1 

CAV134 

Output band pass filter 

1 

ETL2139TA 

Air extraction fan 

2 

VEH4E315 

Mains transformer 

1 

SPT036-1 

Standard 28 unit rack cabinet 

1 

MECC000343/EURO 

 

 

 

Figure 1: ETL0480TBD-TP Transposer (E Amplifier) 

October 2002 

CMAN0480ENG 

Page 7 

Summary of Contents for ETL0480TBD

Page 1: ...al Manual INSTALLATION USE 1 kW UHF TV RF AMPLIFIER ETL0480TBD EuroTel S r l Via della Birona 30 32 20052 Monza Italy Tel 39 039 230 2645 Fax 39 039 230 2650 E Mail salesmail eurotel it Web http www eurotel it ...

Page 2: ...e ETL0470 12 VII RF AMPLIFIER CONFIGURATIONS ORDERING INFORMATION 14 Section C OPERATING INFORMATION 15 I INSTALLATION 15 1 ETL0480TBD R F Amplifier mounting procedure 15 2 Other connections 16 3 ETL0470 front panel controls displays connectors 17 4 ETL0470 rear panel connectors 19 5 Enable IN OUT DIN socket 21 6 ALARMS OUT socket 21 7 SERIAL DATA RS 485 socket 22 8 SERIAL DATA COM RS 232 socket 2...

Page 3: ... Amplifier blocks diagram 13 Figura 5 A C Mains distribution module rear panel 16 Figure 6 Front panel of ETL0470 TV RF Amplifier Module 18 Figure 7 Rear panel of ETL0470 TV RF Amplifier Module 20 Figure 8 Enable socket and connector 21 Figure 9 ALARMS OUT socket 21 Figure 10 Serial DataRS485 in out socket 22 Figure 11 Serial Data Com in out socket 22 Figure 12 E LINK SERIAL NETWORK in out socket ...

Page 4: ...low is to be completed Release Signature AUTHORITY DATE EUROTEL S r l The information contained herein is the property of EUROTEL S r l and is supplied without liability for errors or omissions and no part may be reproduced used or disclosed except as authorized by contract or other written permission The copyright and the foregoing restriction on reproduction use and disclosure extends to all med...

Page 5: ...t panel coaxial interconnecting cables of the EXCITER Although suitable protection circuitry is in place sudden loss and re application of RF drive causes transients that may damage one or more RF amplification stages In any case but especially when the RF Power Amplifier is operating do not change position of the switch A G C m g c in the EXCITER Although suitable protection circuitry is in place...

Page 6: ...one breath every five seconds i e 12 times a minute This should be continued until the victim revives or a doctor certifies death As consciousness returns the victim will start to breathe on his own and a pink color replaces the blue look This is the time to stop resuscitation Continue to hold his chin up and so keep the airway clear In the case of injuries to the mouth it may be necessary to use ...

Page 7: ...W The configuration of two ETL0470 TV RF Power Amplifier Modules is designated model ETL0480TBD which comprises two power amplifier modules two 3 dB hybrids and a band pass output filter with a power rating of 1 kW All these components are housed in a standard 19 metal cabinet which provides additional space for the Exciter and for ancillary equipment A transmitter or a Transposer capable of a ful...

Page 8: ...ameter fans for the extraction of hot air The list of standard parts is as follows PARTS SUPPLIED IN THE STANDARD CONFIGURATION QTY MODEL 700 W TV RF Power Amplifiers Modules 2 ETL0470 Input power divider gain and phase equalizer 1 MOE142 3 dB Output power summer 1 ETL2140TA 50 Ohm high power balancing load 1 MODM299 Output directional coupler 1 ETL2141TA Interconnection cables accessories kit 1 C...

Page 9: ...is The four R F amplifiers of the output stage are coupled together by means of three suspended substrate hybrid couplers The R F amplifier modules are mounted on a massive heat sink in the bottom part of the cabinet and the 3 switch mode power supplies are mounted at the upper of the cabinet The modules are PARTS SUPPLIED IN THE STANDARD CONFIGURATION QTY MODEL Class AB UHF RF buffer Amplifier mo...

Page 10: ...alanced Input return loss 18 dB 3 Output Parameters Output frequency range BANDS IV V 470 860 MHz Power gain 25dB Gain flatness 1 5 dB Output impedance 50 Ω unbalanced Permissible VSWR 1 5 Standard Output power 1 kW Spurious suppression 60 dB Harmonic suppression 60 dB Rejection of out of band IMD products 60 dB I M D Products Suppression with driver series ETL0310 or ETL0290 60 dB 8 10 16 dB rate...

Page 11: ...itude Frequency response 5 dB within the Vision band Group Delay deviations 30 Ns within the Vision band 2T K factor 1 5 Luminance non linearity 2 Differential Gain error 3 Differential Phase error 3 Sync pulse compression 3 Audio frequency S N ratio 64 dB 50 KHz deviation 5 Dimensions and Weight Dimensions Standard 19 frame 40 unit H 1540mm D 800mm L 565mm Weight 120 kg Page 10 CMAN0480ENG Octobe...

Page 12: ...utput level of 600 W each The 3 dB high power hybrid connected to the outputs of the two RF Amplifiers sums the output signals to a nominal level of 1kW 1 E LINK RF reflected power RF forward power Dir Coupler A L C Enable commands RF output Bpass filter 3 dB Hybrid 50 Ohm load Amplifier ETL0470TAD SLAVE 2 Amplifier ETL0470TAD MASTER 50 Ohm load 3 dB Hybrid gain phase equaliser EXCITER external RF...

Page 13: ... off This function is obtained through the E LINK interconnection 2 Theory of operation of 700 W UHF TV RF Amplifier Module ETL0470 The ETL0470 UHF TV RF Amplifier Module blocks diagram is shown in figure 4 The nominal RF input of 2 W coming from the external Exciter is amplified by the driver module MOE140C800 to a nominal level of 40 W A directional coupler monitors forward input power to the fi...

Page 14: ...ally dark It turns on to indicate that one alarm has occurred In this condition the Metering alarm and Protection module immediately disables the amplifier The red V S W R ALARM LED is normally dark It turns on to indicate that the reflected output power has risen above a pre set critical threshold In this condition the Metering and Protection module immediately disables the amplifier The yellow W...

Page 15: ...or VHF Band III In UHF position 10 is not used When the Amplifier is part of a complete Transmitter or Transposer position 10 in UHF or 11 in VHF are used for a separation mark followed in positions 11 12 or 12 13 by TX or TP Positions 14 and 15 are spare EXAMPLES Description Code Single UHF RF Amplifier 500 W class AB ETL0470TAD Single VHF Band III RF Amplifier 800 W class AB ETL0470TAV Complete ...

Page 16: ...in the lower space These spaces are also marked with corresponding stickers pasted on the inside wall of the cabinet Install the Exciter if supplied in the space near the bottom of the cabinet Connect all cables supplied and already wired in the cabinet In order to simplify this operation every cable has stickers at each end As an additional help here below is a complete list of all connections QT...

Page 17: ... the rack cabinet The air can be ducted externally by means of flexible lightweight tubing with a diameter of 350 mm The maximum allowable ducting length is 5 meters With longer runs a suitable depression must be created by means of an external fan 2 Other connections Both the ETL0470 make available external alarm connections by means of hard wired and insulated relay contacts Additionally all sig...

Page 18: ... MULTIFUNCTION METERING DISPLAY Two row 16 character alphanumeric display Shows levels of RF output power supply voltage supply current and heats sink temperature It also shows warning conditions alarm conditions and other information LINE LED YELLOW Shows presence of mains voltage ON AIR LED GREEN Indicates that the RF Amplifier is operating normally and RF output is within limits specified ALARM...

Page 19: ...EUROTEL ITALY ETL0480TBD Figure 6 Front panel of ETL0470 TV RF Amplifier Module Page 18 CMAN0480ENG October 2002 ...

Page 20: ...end the ready signal to the Exciter ALARMS OUT D type 25 pin socket Provides contacts from the Low Output Power alarm relay and Reflected Power alarm relay E LINK SERIAL NETWORK Type D 9 pin socket to be connected to the second amplifier working in tandem configuration SERIAL DATA IN OUT RS 485 D type 9 pin socket Sends all amplifier data information after request from a data gathering external co...

Page 21: ...EUROTEL ITALY ETL0480TBD Figure 7 Rear panel of ETL0470 TV RF Amplifier Module Page 20 CMAN0480ENG October 2002 ...

Page 22: ...25 pin DIN type socket which may be used to make external connections as shown in following Table Table 1 Connections to ALARMS OUT socket Figure 9 ALARMS OUT socket PIN 25 PIN DIN SOCKET 1 Low power alarm Contact closed in alarm condition 2 Low power alarm Common contact 3 Low power alarm Contact open in alarm condition 4 5 6 7 8 9 10 11 12 13 Not connected 14 Reflected power alarm Contact closed...

Page 23: ...able 3 Connections to SERIAL DATA RS232 socket Figure 11 Serial Data Com in out socket PIN DESCRIPTION 1 Not connected 2 TX out 3 RX in 4 RX c er 5 Ground 6 Not connected 7 Not connected 8 TX c er 9 Not connected 9 E LINK SERIAL NETWORK socket Table 4 Connections to E LINK SERIAL NETWORK socket Figure 12 E LINK SERIAL NETWORK in out socket PIN DESCRIPTION 1 Not connected 2 CAN low 3 GND 4 Not conn...

Page 24: ...iter output power by clock wise rotating the multi turn potentiometer labelled Power on the front panel of the A G C A L C Controller plug in module until reaching about 100W output power on each one of the amplifier modules Check simultaneously that the total forward output power level is about 200W and the total reflected power FINAL F R on Amplifier 2 is about 0W If the above values are correct...

Page 25: ...sor and Protection module detects an alarm condition as explained in section B two items are immediately acted upon the power supplies are turned off and at the same time the RF drive is turned down by removing the Enable command to the Exciter Then the Amplifier is recycled periodically to check if the condition causing the alarm has been removed As soon as this happens the RF power output is aut...

Page 26: ...ly push the SELECT button until the required menu title appears Then the required action is selected pushing one of the two buttons marked with an arrow Finally the selected action is memorized by pushing SELECT a second time Pushing SELECT a third time brings up the next menu and so on For more detail see examples in the next pages MENU DESCRIPTION Display contrast Changes the alphanumeric LCD di...

Page 27: ...rence power level Increases the reference power level TX A L C config Enables o disables the A L C loop When the loop is disabled the display shows A L C contr off ALC Disabled The A L C control loop is disabled ALC Enabled The A L C control loop is enabled ALC on AUX input The A L C control loop is enabled the reference power is referred to the power read on external aux Input Store LCD View The ...

Page 28: ...ow Tx enable config Lower row Next Enter Push buttons SELECT Push button to enter this menu The display now shows the previously entered ENABLE condition Upper row External Lower row Set Ext Int Push buttons SELECT Push button to select the Internal permanent enable condition The Amplifier will now be permanently enabled The display shows Upper row Internal Lower row Set Ext Int Push buttons SELEC...

Page 29: ...wer row ALC level 3 Push SELECT to enter the menu the display shows Upper row FWD peak 600 W Lower row Menu row 2 row 1 Push buttons SELECT Repeatedly push SELECT until the display shows Upper row ALC ref Power Lower row Next Exit Enter Push buttons SELECT Push Enter to enter the menu The display shows Upper row ALC ref Power 600W Lower row SET Push buttons SELECT Use the push buttons and to bring...

Page 30: ... stored in the EEPROM Heat Sink Alarm Temperature 70 C if one of the heat inks exceeds this threshold the power supplies are turned off and the alarm condition is stored in the EEPROM NOTE When a temperature alarm occurs TWO conditions are naturally always stored in the EEPROM one is for the temperature warning temperature reaches 63 C that was stored while the temperature was rising and the other...

Page 31: ...T button until View warning log appears Push button to enter this menu Push CLR The display will show Cleared Then repeatedly push the SELECT button until View alarms log appears Push button to enter this menu Push CLR The display will show Cleared At this point the yellow WARNING LED will go off 8 Data Communication A serial CAN port E LINK network interconnection among power amplifiers A serial ...

Page 32: ...ctory Set upper and lower positions of the front panel meter to Vunreg Push SELECT several times until Frequency band appears Push Enter to enter this menu You will see the frequency band at which the Amplifier had previously been set up On the and push buttons the entire UHF band is available in steps of 100 MHz Now using or set the frequency nearest to the new operating channel which must be use...

Page 33: ...in doubt IMPORTANT The menu entries from V unreg as described below are only available on Equipment with Serial Number 9314 or higher For older equipment please contact the factory CALIBRATION OF FINAL RF POWER READINGS In the ETL0480TBD the final readings of Forward and Reflected RF power at 1 kW level are performed by the RF Amplifiers If one RF Amplifier is replaced then the calibration factor ...

Page 34: ...TEL ITALY ETL0480TBD Figure 13 Screen of threshold values and calibration data of RF Amplifier ETL0470 The external coupler calibration factor xx is available in this window October 2002 CMAN0480ENG Page 33 ...

Page 35: ...3 dB hybrid A 0 25 dB A 0 5 dB A 1 dB A 0 125 dB A 1 dB A 0 5dB A 0 25 dB A 0 125 dB Figure 14 3 dB hybrid gain phase equaliser MOE142 Each output of the internal 3 dB hybrid is equipped with 4 attenuators in series and with 4 phase shifting lines is series Attenuators are in values 1 2 4 8 starting with 0 125 dB Phase shifting lines are also in values 1 2 4 8 starting with a nominal phase value o...

Page 36: ...h BUT WITHOUT INTERRUPTING THE CONTACT If the power into the balance load increases less phase shift is needed on this side or more in the other side Once the side that needs more phase shift is found tighten the N connector and insert more phase shift on that side in nominal steps of 2 5 until an imbalance of 2 or less of the output power as read in the F R position of Amplifier 1 is reached Remo...

Page 37: ...ill now see on the meter Aux ddd W Adj xx Where the number ddd is the RF power output reading and xx is the calibration factor Write down the value of this calibration factor xx which can be a number between 50 and 50 Now push SELECT of replacement Amplifier several times until you reach Aux coupler adj Push Enter You will now see on the meter Aux ddd W Adj xx Where the number ddd is the RF power ...

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