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Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
TECHNICAL AND MAINTENANCE MANUAL
VJ10000-TE (4CX12000)
10Kw Power Tetrode Amplifier 87.5 - 108 MHz
Manufactured by R.V.R. Elettronica - Italy
1
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
INDEX
I - PRELIMINARY INSTRUCTIONS AND WARRANTY INFORMATION.......................................................... 4
II - TUBE WARRANTY INSTRUCTIONS................................................................................................................... 6
III – SAFETY REGULAMENT! .................................................................................................................................... 8
CHAPTER 1.................................................................................................................................................................... 12
TX10000-TE GENERAL DESCRIPTION .................................................................................................................. 12
1.1) TRANSMITTER DESCRIPTION ....................................................................................................................... 12
1.2) ELECTRICAL DESCRIPTION.......................................................................................................................... 12
CHAPTER 2.................................................................................................................................................................... 19
ELECTRICAL DESCRIPTION................................................................................................................................... 19
2.1
INTRODUCTION ......................................................................................................................................... 19
2.2
CONSIDERATIONS ON WORKING PARAMETERS .................................................................................. 19
2.3
TUBE ............................................................................................................................................................ 20
2.4
R.F. CAVITY ................................................................................................................................................. 20
CHAPTER 3.................................................................................................................................................................... 36
INSTALLATION ......................................................................................................................................................... 36
3.1 INTRODUCTION ............................................................................................................................................... 36
3.2 UNPACKING...................................................................................................................................................... 36
3.3 ASSEMBLY DESCRIPTION............................................................................................................................... 36
3.4 ASSEMBLY PROCEDURES FOR THE INSTALLATION OF VJ1000-TE ........................................................ 36
3.5 TRANSMITTER CONNECTION TO MAINS VOLTAGE ................................................................................... 37
3.5 TUBE INSTALLATION....................................................................................................................................... 38
3.7 TUNING AND SWITCH ON PROCEDURES .................................................................................................... 39
CHAPTER 4.................................................................................................................................................................... 46
MAINTENANCE......................................................................................................................................................... 46
4.1 SAFETY REQUIREMENTS ................................................................................................................................ 46
MAINTENANCE LEVEL 1 ........................................................................................................................................ 46
4.2 ROUTINE MAINTENANCE ............................................................................................................................... 46
MAINTENANCE LEVEL 2 ........................................................................................................................................ 46
4.3 MODULE REPLACEMENT............................................................................................................................... 46
4.4 TUBE REPLACEMENT...................................................................................................................................... 47
4.5
AIR FILTER REPLACEMENT ..................................................................................................................... 47
APPENDIX A.................................................................................................................................................................. 47
CIRCUIT DIAGRAMS, LAYOUTS AND BILLS OF MATERIAL .......................................................................... 47
2
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
PICTURES
FIG. 1 FRONT VIEW DESCRIPTION ........................................................................................................................... 23
FIG. 2 FRONT VIEW .................................................................................................................................................... 24
FIG. 3 REAR VIEW .................................................................................................................................................... 25
FIG. 4 TOP VIEW DESCRIPTION ............................................................................................................................ 28
FIG. 5
PROTECTIONS CARD DESCRIPTION .................................................................................................... 29
FIG. 6 R.F. CAVITY'S FRONT VIEW DESCRIPTION ............................................................................................ 30
FIG. 7 WATTMETER VIEW DESCRIPTION........................................................................................................... 31
FIG. 8 R.F. CAVITY LEFT SIDE VIEW DESCRIPTION......................................................................................... 32
FIG. 9 VOLTAGE STABILIZER DESCRIPTION..................................................................................................... 33
FIG. 10
R.F. CAVITY'S REAR VIEW DESCRIPTION .......................................................................................... 34
FIG. 11
DETAIL REFERENCE ................................................................................................................................ 35
FIG. 12
TUBE INSTALLATION DIAGRAM N°1 ................................................................................................. 41
FIG. 13
TUBE INSTALLATION DIAGRAM N°2 ................................................................................................. 42
FIG. 14
TUBE INSTALLATION DIAGRAM N°3 .................................................................................................. 44
FIG. 15
I/O RACK CONNECTORS ........................................................................................................................ 48
FIG. 16 I/O RACK CONNECTORS............................................................................................................................... 49
FIG. 17
REFERENCE VIEW ................................................................................................................................... 50
FIG. 18 R.F. CIRCUIT.................................................................................................................................................... 51
FIG. 19
MEASURE CARD ...................................................................................................................................... 52
FIG. 20
380V CIRCUIT ........................................................................................................................................... 53
FIG. 21
LOW TENSION CIRCUIT ......................................................................................................................... 54
FIG. 22
MEASURE, ALLARMS, LOW-TENSION CIRCUIT............................................................................... 54
FIG. 23
POWER RELAY CARD ............................................................................................................................. 55
FIG. 24
REFERENCES VIEW................................................................................................................................. 56
FIG. 25
INTERFACE TELEMETRY CARD.......................................................................................................... 57
FIG. 26
TUNINGS RELAY CARD ........................................................................................................................ 58
FIG. 27
REFERENCES VIEW................................................................................................................................. 59
FIG. 28
POWER SUPPLY P1 .................................................................................................................................. 60
FIG. 29
SECTIONAL VIEW OF THE POWER SUPPLY P1................................................................................. 61
FIG. 30
POWER SUPPLY P2 .................................................................................................................................. 62
FIG. 31
SECTIONAL VIEW OF THE POWER SUPPLY P2.................................................................................. 63
FIG. 32
PROTECTIONS PLANE ............................................................................................................................ 64
FIG. 33
REFERENCE VIEW .................................................................................................................................... 65
FIG. 34
RESISTORS PLANE .................................................................................................................................. 66
FIG. 35
RESISTORS PLANE .................................................................................................................................. 67
FIG. 36
REFERENCE VIEW ................................................................................................................................... 68
FIG. 37
TUNING MOTOR LOAD .......................................................................................................................... 69
FIG. 38
REFERENCE VIEW ................................................................................................................................... 70
FIG. 39
RHEOSTATS ............................................................................................................................................... 71
FIG. 40
REFERENCE VIEW ................................................................................................................................... 72
FIG. 41
PJ1000 PROTECTION SWITCH - PROTECTION FUSES ...................................................................... 73
FIG. 42
REFERENCE VIEW ................................................................................................................................... 74
FIG. 43
INPUT SOCKET ......................................................................................................................................... 75
FIG. 44
REFERENCE VIEW ................................................................................................................................... 76
FIG. 45
UTILITIES SOCKET.................................................................................................................................. 77
FIG. 46
REFERENCE VIEW ................................................................................................................................... 77
FIG. 47
HIGHT TENSION PANEL......................................................................................................................... 78
TABLES
TABLE A ELECTRICAL CHARACTERISTICS.......................................................................................................... 14
TABLE B MECHANICAL AND ENVIROMENTAL CHARACTERISTICS.............................................................. 15
TABLE C TRANSMITTER LIMITS ............................................................................................................................. 15
TABLE D READABLE PARAMETERS ON THE FRONT METER PANEL .............................................................. 16
TABLE E READABLE PARAMETERS ON THE FRONT METER PANEL .............................................................. 17
TABLE F PROJECT STRUCTURE SPECIFICATIONS ............................................................................................... 18
TABLE G SPECIFICATION OF THE 4CX20000C TUBE............................................................................................ 22
3
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
I - PRELIMINARY INSTRUCTIONS AND WARRANTY INFORMATION
Please observe safety precautions when handling this unit. This equipment contains dangerous
currents and high voltages.
This manual is written as a general guide for those having previous knowledge and experience with
this kind of equipment. It is not intended to contain a complete statement of all safety warnings
which should be observed by personnel in using this or other elettronic equipment.
R.V.R. doesn't assume responsability for injury or damage resulting from improper procedures or
practices by untrained/unqualified personnel in the handling of this unit.
Please observe all local codes and fire protection standards in the operations of this unit.
CAUTION: always disconnect power before opening covers or removing any part of this unit. Use
appropriate grounding procedures to short out capacitors and high voltage points before servicing.
Any damage to the goods must be reported to the carrier in writing on the shipment receipt. Any
discrepancy or damage discovered subsequent to delivery, shall be reported to R.V.R. within five
(5) days from its receipt.
R.V.R. extends to the original end-user purchaser all original manufacturers warranties which are
transferable and all claims are to be made directly to R.V.R. per indicated procedures.
All manufacturers warranties will be supported by R.V.R. to ensure precise and speedy service
where possible.
R.V.R. shall not be liable for any damage of whatsoever nature, arising out of or in connection with
the product or its use thereof.
R.V.R.'s warranty shall not include:
a.
Re-shipment of the unit to R.V.R. for repair purposes
b.
Any unauthorized repair/modification
c.
Incidental/consequential damages as a result of any defect
d.
Nominal non-incidental defects
e.
Re-shipment costs or insurance of the unit or replacement
units/parts
Warranty shall come into force from invoice date and for the period of the manufactures warranty.
4
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
To claim your rights under this warranty:
a.
Contact the dealer or distributor where you prchased the unit. Describe the problem and ask
if he has an easy solution. Dealers and Distributors are supplied with all the information about
problems that may occur and usually they can repair the unit quicker than what the manufacturer
could do. Very often installing errors are discovered by dealers.
b.
If your dealer cannot help you, contact R.V.R. in Bologna and explain the problem. If it is
decided to return the unit to the factory, R.V.R. will mail you a regular authorization with all the
necessary instructions to send back the goods.
c.
When you receive the authorization, you can return the unit. Pack it carefully for the
shipment, preferably using the original packing and seal the package perfectly. The customer
always assumes the risks of loss(i.e., R.V.R. is never responsible for damage or loss), untill the
package reaches R.V.R. premises. For this reason, we suggest you
to insure the goods for the
whole value. Shipment must be effected C.I.F. (PREPAID) to the address specified by R.V.R.'s
service manager on the authorization.
DO NOT RETURN UNITS WITHOUT OUR AUTHORIZATION AS THEY WILL BE
REFUSED.
Be sure to enclose a written technical report where mention all the problems found and a copy of
your original invoice establishing the starting date of the warranty.
Replacement and warranty parts may be order from the following address. Be sure to include the
equipment model and serial number as well as part description and part number.
R.V.R. Elettronica S.p.a.
- Broadcasting Equipment Via del Fonditore, 2/2c
Zona Roveri
40138 Bologna - Italy
International Phone: +39 - 51 - 6010506
FAX Number: +39 - 51 - 6011104
R.V.R. reserves the right to modify the design and specifications of the equipment in this manual
without previous
5
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
II - TUBE WARRANTY INSTRUCTIONS
VARIAN POWER GRID PRODUCT LIMITED WARRANTY
Varian products are warranted to be free from defects in workmanship and materials only. The
warranty involves both calendar time and filament (or heather) operation time. Specifically
involved are: time since the product was shipped from varian time since delivery to the user,
and operation time.
WHICHEVER ELAPSES FIRST CONCLUDES THE WARRANTY.
The warranties are determined by the codes shown in the price schedule.
TIME SINCE
SHIPMENT
TIME SINCE
SHIPMENT
TIME SINCE
HEATER-ON
Code from EIMAC
To The User
Time
T
36 MONTHS
24 MONTHS
10.000 HOURS
R
24 MONTHS
12 MONTHS
5.000 HOURS
P
24 MONTHS
12 MONTHS
4.000 HOURS
N
24 MONTHS
12 MONTHS
3.000 HOURS
K
24 MONTHS
12 MONTHS
1.000 HOURS
L
LIFE TESTED AT FACTORY IN LIEU OF AN OTHER WARRANTY
12
24 MONTHS
12 MONTHS
he last category is for hardware or accessory items whwre only calendar time is involved.
An Original Equipment Manufacturer (OEM) or an authorized Varian Distributor can hold an item
in his stock for 12 months and the end user still receiver full warranty. As an example, warranty
code T is for 36 months from the date of the shipment from EIMAC, or 24 months from the date
of delivery to the user,or 10.000 hours of filament-on time, whichever elapses first.
A product which fails (because of faulty workmanship or materials) in the first 10% of the
warranty-time hours will be heither replaced at no charge by Varian or 100% of the purchase price
will be credited through the original authorized Varian Distributor or OEM. If a failure occurs in
the remaining 10-100% of the warranty time hours a prorated adjustment will be calculated and
credit issued. This can only be done through the original OEM or authorized Varian Distributor
6
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
A prorated credit is calculated as follows:
Warranty (hours) - Use Time (hours)
= % Credit
Warranty (hours)
Thus for failure Code N (3000 hours) if failure occurred after 600 hours and was found to be
workmanship or materials related:
3000 - 600
= 80%
3000
Tubes being returned on a warranty claim are normally sent to authorized Varian distributor or
OEM from whom originally purchased. If returned directly to the Varian plant of manufacture, the
authorized Varian Distributor or OEM from whom purchased should be notified in case there are
some special instructions.
All products returned on a warranty claim must be shipped via prepaid freight and include a
completed copy of a service report form, a copy of which is included with every shipped product. A
warranty claim cannot be processed without this form. A copy of the original invoice, bill of sale, or
other purchase document should be included with the executed service report form to establish
purchase date and price.
The original Varian shipping carton and packing material should always be used for any warranty
claim return. Shipping damage because of poor packing will normally preclude any warranty
adjustment since the damage will usually make any testing or measuraments impossible.
PARCEL POST SHOULD NEVER BE USED FOR SHIPMENT OF TUBES.
7
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
III – SAFETY REGULAMENT!
WARNING!
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 the
dangers inherent in handling potentially hazardous electrical and electronic circuits.
It is not intended to contain a complete statement of all safety precautions which should be
observed by personnel in using this or other electronic equipment.
The installation, operation, maintenance and service of this equipment involves risks both to
personnel and equipment, and must be performed only by qualified personnel exercising due care.
R.V.R. ELETTRONICA s.p.a. shall not be responsible for injury or damage resulting from
improper procedures or from the use of improperly trained or inexperienced personnel performing
such tasks.
During installation and operation of this equipment, local building codes and fire protection
standards must be observed.
WARNING!
Always disconnect power before opening covers,
doors, enclosures, gates, panels or shields.
Always use grounding sticks and short out high
voltage points before servicing. never make
internal adjustments, perform maintenance or
service 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.
8
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
TREATMET OF ELECTRICAL SHOCK
1) If victim is not responsive follow the A-B-C's of basic life support.
PLACE VICTIM FLAT ON HIS BACK ON A HARD SURFACE
A) AIRWAY
B) BREATHING
IF UNCONSCIOUS,
OPEN AIRWAY
IF NOT BREATHING,
ARTIFICIAL BREATHING
BEGIN
LIFT UP NECK, PUSH,
FOREHEAD BACK,
CLEAR OUT MOUTH IF
NECESSARY, OBSERVE
FOR BREATHING.
TILT HEAD PINCH NOSTRILS, MAKE
AIRTIGHT SEAL, 4 QUICK FULL
BREATHS. REMEMBER MOUTH TO
MOUTH RESUSCITATION MUST BE
COMMENCED AS SOON AS POSSIBLE.
C) CIRCULATION
CHECK CAROTID PULSE
IF PULSE ABSENT, BEGIN
ARTIFICIAL CIRCULATION
DEPRESS STERNUM 1 1/2" TO 2"
APPROX. 80 SEC. : ONE RESCUER, 15 COMPRESSIONS,
2 QUICK BREATHS.
APPROX. 60 SEC. : TWO RESCUERS, 5 COMPRESSIONS,
1 BREATH
NOTE: DO NOT INTERRUPT RHYTHM OF COMPRESSION
PERSON IS GIVING BREATH.
WHEN SECOND
Call for medical assistance as soon as possible.
2) If victim is responsive:
a. Keep them warm.
b. Keep them as quiet as possible.
c. Loosen their clothing (a reclining position is recommended).
9
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
FIRST-AID
Personnel engaged in the installation, operation, maintenance or servicing of this equipment are
urged to become familiar with first-aid theory and practices. The following information is not
intended to be a complete first-aid procedure, it is brief and is only to be used as a reference. It is
the duty of all personnel using the equipment to be prepared to give adequate Emergency First Aid
and thereby prevent avoidable loss of life.
Treatment of electrical Burns
1) Extensive burned and broken skin.
a.
b.
c.
d.
e.
Cover area with clean sheet or cloth.
(Cleanest available cloth article).
Do not break blisters, remove tissue, remove adhered particles of clothing, or apply any
salve or ointment.
Treat victim for shock as required.
Arrange transportation to a hospital as quickly as possible
If arms or legs are affected keep them elevated.
NOTE
If medical help will not be available within an hour and the victim is conscious and not vomiting,
give him a weak solution of salt and soda: 1 level teaspoonful of salt and 1/2 level teaspoonful of
baking soda 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)
a.
Apply cool (not ice cold) compresses using the cleanest available cloth article.
b.
Do not break blisters, remove tissue, remove adhered particles of clothing, or apply salve or
ointment.
c.
Apply clean dry dressing if necessary.
d.
Treat victim for shock as required.
e.
Arrange transportation to a hospital as quickly as possible.
f.
If arms or legs are affected keep them elevated.
10
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
11
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
CHAPTER 1
TX10000-TE GENERAL DESCRIPTION
1.1) TRANSMITTER DESCRIPTION
The TX10000-TE/V1 is an FM broadcast transmitter working in the frequency band from
87.5 MHz to 108 MHz. The transmitter is composed of a modulator (mono or stereo) mod.
PTX30LCD, a driver amplifier mod. PJ1000M and a tetrode final amplifier mod. VJ10000TE for the antenna connection.
The transmitter is composed of two 19" racks, 40 HE each, meccanically and electriccally
connected together, so that, when the installation is completed, to realize a single functional
equipment that shows on the right side the driver amplifier, the modulator and the power
supply and service section for final stage amplifier, and on the left side shows the final
amplifier cavity and the general air cooling section.
The final power amplifier uses the tetrode 4CX12000A grounded grids configured with
cathode excitation.
1.2) ELECTRICAL DESCRIPTION
The VJ10000 ia a tube amplifier with utilize the tetrode 4CX12000A grounded grids
configured with cathode excitation.
This amplifier is able to operate with several output max power values but inferior to 27 Kw
continuous with a driver power of about 1000W.
The amplifier show plate pipes, load and input motorised, allowing coverage of the entire
frequency band.
The VJ10000 has been designed to use a 3-phase supply (3-phase option without neutral).
1.3) FRONT PANEL DESCRIPTION
The working parameters values and commands are available separately on each equipment.
About the description of the modulator and driver amplifier see as reference its manual
issued to the transmitter; in fact, these equipment are autonomous and they are only
contained in the complete transmitter rack.
About the final power amplifier are available the readings of the following working
parameters:
A) forward and reflected output power on a single meter, selectable by a selector placed on
the itself meter;
B) control and screen grid currents on a single meter, selectable by a selector placed on the
itself meter;
C) plate current;
D) plate voltage, control grid voltage, screen voltage, filament voltage and filament current
on a single multimeter, selectable by a totative selector placed on the itself multimeter;
E) output cavity air temperature and number of the protection interventions on a alphanumeric display at double two digits;
F) indication with the working hours of the tetrode filament on hour counter;
G) active alarm led indications (red color) relative to anomalies caused to excessive plate,
control grid and screen grid currents, excessive reflected power, insufficient control grid
voltage, plate voltage enabled but not present, insufficient air pression in the cavity,
excessive air temperature on the output cavity;
H) INTERLOCK led indicator to indicate the block of the equipment caused to personnel
safety.
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Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
I) led indicators as memory of the protection interventions happened (yellow color);
J) led indicator to indicate the voluntary protections service stand-by for short time for a
final amplifier overload.
K) led indicator to indicate the voluntary plate power supply stand-by.
The commands relative the final power stage amplifier are the followings
A) key selector to enable the tunings push buttons;
B) two push-buttons at three positions that allow the setting of the input tuning of the tetrode
amplifier cavity;
C) a push-button at three positions that allows the setting of the frequency tuning of the
tetrode amplifier cavity;
D) a push-button at three positions that allows the setting of the working impedance of the
tetrode anode;
E) a selector at two positions that allows to put in stand-by the tetrode anode power supply;
F) a selector at six positions to select the different measures of the multimeter;
G) a selector at two positions that allows to select the control grid or screen grid current
measures;
H) a selector at two positions that allows to select the forward and reflected power
measures;
I) a key selectro that allows to put in stand-by for a short time the overload protections of
some amplifier’s parameters;
J) a push-button that allows to reset the counting and the memories of the protections
interventions occurred;
K) a push-button that allows to change on the diplay the indication from protection
interventions counter to status of the warm-up timer;
L) a main switch with overload protection that allows to stop the mains voltage to all service
circuits of the amplifier.
Please refer to Table A for the electrical specifications and Table B for the mechanical
specifications.
1.4) PANNEL ALARMS
The panel alarms (fig.2) has numbers indicators of different colors: the red leds point out a
condition of current alarm, the yellow leds show that there has been a condition of alarm
then reentered.
This encircled is characterized by the following protections: excess of VSWR, excess grid
current, excess of anodic current, insufficient power tension, excess of temperature, opening
panel, insufficient ventilation and a key interrupter.
On the panel there are two interrupters, one visualizing the preheating time of valve
filament the second reading the number of reset cycles that the circuit protection has
performed.
Finally a digital display with four digits show the time or the n° of cycles (the two digits of
left), the air temperature of expulsion (°C) (the two digits of right).
Prese, refer to the TABLE A for electrical charcterostocs and the TABLE B for
enviromental specifications.
13
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
TABLE A ELECTRICAL CHARACTERISTICS
Power Supply
3-phase with neutral:
3-phase without neutral:
380-415V±15%
208-240V±15%
Manins Voltage Frequency
50-60 Hz
Frequency Range
87.5 - 108 MHz
Tube
4CX12000A
Electrical power consumption
for 10Kw in antenna
22KVA
External Thermal power consumption
for 10Kw in antenna
7Kw
Cosφ
0.9
Correct power consumption for phase
32%,32%,36%
Output Power
from 500 to 10000W
Antenna Impedance
50 Ohm
No essential emessions
less than -85dBc
Frequency Stability
2.5 ppm
Modulation Type
F3E
Preenphasis
50 o 75 micro-seconds
selectable
Modulation S/N ratio
82 dB (rms value, dev=±75Khz)
AM synchronous
-47dB (mod=400Hz, dev=±75Khz)
AM asynchronous
-47dB
Audio MPX input impedance
600 or 1000 Ohm
Audio Channel input impedance
600 or 1000 Ohm
Input audio level
fron -13 to +14dB
Channel frequency response
from 30 to 15000Hz
Channel distorsion
max 0.07%
Stereo separation
greater than 50 dB
Input for SCA or RDS signal
n°3
Air cooling
Forced ventilation
(adjustable)
(from 30 to 15000Hz)
14
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
TABLE B MECHANICAL AND ENVIROMENTAL CHARACTERISTICS
Rack dimensions
565 mm (22.24") W
850 mm (33.46") D
1930 mm (75.98") H
Working temperature
from -5° to +45°C
Maximum installation admissible
max 95% to 45°C without condensing
Maximum installation height
2500 m
Cooling air volume
3000 m3/h
TABLE C TRANSMITTER LIMITS
Standard tetrode time life=9000 hours at 10KW (maxim 12000 hours)
Power efficiency that depends from the antenna system quality SWR<1.15
Good aspiration air for cooling without impurities
Maintenance aspiration air filters =3 mounths
Very high working noise.
15
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
TABLE D READABLE PARAMETERS ON THE FRONT METER PANEL
Output forward power
Output reflected power
Tetrode anode current
Tetrode screen grid current
Tetrode anode voltage
Tetrode filament voltage
Tetrode screen grid voltage
Tetrode control grid voltage
Tetrode driver power
Reflected power of the tetrode input circuit
Power supply current of the solid state PA stage
Power supply voltage of the solid state PA stage
Air temperature of the final stage
Air temperature of the middle stage
Tetrode warm-up timing
READABLE PARAMETERS ON THE EXCITER'S FRONT PANEL
Exciter output forward power
Exciter output reflected power
Working frequency
Audio deviation level for each channel
Modulation level for SCA and RDS inputs
Internal parameters for the various stages of the exciter
16
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
TABLE E READABLE PARAMETERS ON THE FRONT METER PANEL
Excessive output reflected power in antenna
Tetrode anode overcurrent
Tetrode screen grid overcurrent
Tetrode control grid overcurent
Final stage overtemperature
Excessive reflected power against to driver
Eccessiva corrente assorbita dal driver
Driver working overtemperature
Insufficient air cooling pression
Service interruptions for not lock rack panels (personal safety)
Total power supply arrest for short circuit
Fuses on each service power supply
Fuses on tetrode filament power supplies
Protection switches for overcurrent on aircooling fans
Excessive reflected power against to exciter
Exciter working overtemperature
Exciter final stage avercurrent
Protection fuses for exciter power supply.
17
Data redazione: 25/07/03
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
TABLE F PROJECT STRUCTURE SPECIFICATIONS
Amplifier cavity of the tetrode final stage 1/4 tuned with capacitor output coupling.
Grounded-grid configuration of the Final stage tetrode through by-pass capacitors.
Filter for output armonics attenuation the 9th order shunt type at concentraded constants installed
inside of the rack.
Filter for middle stage armonics attenuation of the 9th order at concentraded constants.
Aircooling fans for each equipment.
Power supply with insertion at two steps to limite the insertion overcurrents.
Inductive-capacitor filter on the tetrode anode power supply.
Capacitors for high voltages in film in no PCB oil (no polarized).
Power resistors not connected in series to tetrode anode power supplies of the final stage to limite
the energy of possible anodic discharges.
Stabilized tetrode filament power supply with electromechanical voltage stabilizer.
Single control and screen grid power supply and supplied by electromechanical voltage stabilizer.
Bleeder resistors on both grid power supplies.
Single protection circuits for each equipment.
Overvoltage soppression circuits on data line and internal measures.
Electronic corcuits protect against discharges coming from anode power supply.
Protection circuit against electrical arcs inside the amplifier cavity.
Each device under voltage is protected by fuses.
For personal safety each circuit is interrupted from the high voltage supply.
On the fron panel the general switch interrupts only the line of low power.
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VJ10000-TE - R.F. Tube Amplifier
CHAPTER 2
ELECTRICAL DESCRIPTION
2.1
INTRODUCTION
This chapter describes, in detail, the operating theory of the VJ10000-TE.
To aid understanding, the unit has been subdivided into modules (fig.1A), each of which is
fully described below.
2.2
CONSIDERATIONS ON WORKING PARAMETERS
The tetrode transmitter is equipped with polarization circuit much versatile that allows to
choise the working Class and the "circulation electrical angle".
When the transmitter is made in the firm is configured in Class B for small power input and
then automatically in Class C for high input power.
This choise allows to obtain the Reflected Power values read on driver not directly
connected with the absolute input reflected power on the tetrode.
The input circuit setting is optimized when the transmitter reaches the programmed output
power; in fact, for lower input power is normal to read reflected power values higher than
the reading on the driver meter.
The transmitter can work with different values of the maximum output power on condition
that lower of 10 KW continuous.
At each power value correspond a better antenna coupling ratio for the best energy
consumption efficency of the equipment.
The best energy consumption efficency of the transmitter is obtained when is evidence a
particular effect of the IG2 current: if the input power increase on the tetrode, there is a big
increasing of the IG2 current but the output power doesn’ t increase more.
A setting in according to the point in which you have the best energy consumption efficency
is advantageus economically, but is dangerous for the reliability.
In fact, if the mains voltage decreases lightly, the transmitter works with the tetrode satured,
with dangerous energy quantity on the harmonic components of the working frequency
present in the RF cavity that can cause electrical arcs with high probability of damage on the
amplifier.
Then, a value of the screen grid current near to the protection threshold could cause
sometimes breakings down of the service.
If the station has a good mains voltage with variations until +/- 7%, the transmitter can be
adjusted with antenna coupling to which corresponds a cavity amplifier efficiency of about
78% (Cavity Efficiency=Forward Power/VA*IA).
When the transmitter works with an high electrical efficiency, the amplifier cavity is tuned
with high Q loaded parameter value.
In This case is necessary to verify that the syncronous amplitude value doesn't increase until
no admissible values.
The operator has a table of characteristics values for the tunings adjusting, but for the great
importance that have some parameters against others, is correct to allow a great choise
freedom and to left to the operator competence the decision about the values to set the
transmitter.
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R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
The limits that mustn't reach are:
- Anode current = 3,6A
- Control grid current G1 = 300mA
- Screen grid current G2 = 300mA
- Output reflected power = 750V with a continuos working of 10KW in antenna
- Anode dissipated thermal power of tetrode > 10KW
- Electrical power consumption efficiency of the amplifier cavity > 80%
The typical working tetrode values for 10KW output power in antenna are:
- Anode voltage = 10700V
- Anode current = 3.10A
- Control grid current G1 = 50-150mA
- Screen grid current G2 = 150-200mA
- Driver power = 900W
When the transmitter is tuned to work correctly at 10KW of output power in antenna, the
final amplifier doesn't present good working parameters if it works at low power.
Note that in this configuration the transmitter cannot work absolutely for long periods with
output power in antenna less than 7KW because the value of thermal power dissipation will
be greater than maximum value admissible for tetrode anode.
The reflected power value too read on the driver meter is never minimum when the
transmitter doesn't work at maximum output power for which is been setted.
2.3
TUBE
This power amplifier uses mainly the 4CX12000A tube.
The 4CX12000A ia a ceramic/metal power tetrode intended for use as a VHF power
amplifier. It features a type of internal mechanical structure which results in high RF
operating efficiency. Low RF losses in this
structure permit operation at full ratings to 110MHz.
The 4CX12000A provides high gain in FM broadcast service, and is also recommended for
RF linear power amplifier service. The anode is rated for 20Kw of dissipation with forcedair cooling and incorporates a highly efficient cooler of new design.
It is also recommended for use as a grounded grid FM amplifier. In addition, grounded-grid
operation is attractive since a power gain as high as twenty times can be obtained.
2.4
R.F. CAVITY
The R.F. Cavity is accessible when are been removed the fixed screws of the front panel.
It's divide in three sections: the top section in which is placed the motorizzations of the
tunings; the central section in which is fixed the tube and the bottom section in which is
placed the tube socket.
A temperature probe is placed externaly on the air chimney that is placed on the top of the
R.F. cavity. The protection circuit that continuously monitors this probe, switch of the
amplifier in case of overtemperature.
This section of the chamber is mounted on four motorized bars and can go up and down in
according to desired transmission frequency.
In the central section of the chamber, around the tube's socket, is situated a collar with
fingers to ground the control grid.
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VJ10000-TE - R.F. Tube Amplifier
The socket is situated in the bottom section, into which the tube is inserted.
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VJ10000-TE - R.F. Tube Amplifier
TABLE G SPECIFICATION OF THE 4CX20000C TUBE
Model
4CX12000A
Anode dissipation
12000 W
Grid dissipation
150 W
Frequency for max. ratings (CW)
110 MHz
Cooling
Forced ventilation
Filament voltage
6.50 V
Filament current
110.0 A
Input/Output Capacity
Amplification factor
0.08 Pf
16 dB
Base
Special coaxial
Recommended air system socket
SK-300
Recommended air chimney
SK-336
Maximum seal & Anode core
Temperature
250°C
Maximum length
24.99 mm (9.84")
Maximum diameter
22.50 mm (8.86")
Weight
Operating position
9.06 Kg (20.0 Lbs)
Vertical
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VJ10000-TE - R.F. Tube Amplifier
FIG. 1 FRONT VIEW DESCRIPTION
1)
Mos-Fet Wideband amplifier, strip line technology, output power 1000W.
2)
Free Panel.
3)
Free Panel.
4)
F.M. exciter controlled by microprocessor, stability 2.5 ppm, 10khz steps, output power
from 0 to 30W adjustable, with LCD graphic display.
5)
Free Panel.
6)
Free Panel.
7)
Free Panel.
8)
10 Kw amplifier cooling air input filters.
9)
Hight tension panel.
10)
Free Panel.
11)
Free Panel.
12)
Free Panel.
13)
10 Kw amplifier num null adjustment.
10 Kw amplifier filament voltage adjustment.
14)
Free Panel.
15)
Protection Panel.
16)
Free Panel.
17)
10 Kw amplifier hot air outlet.
18)
10 Kw amplifier 3"+1/8 R.F. output connector
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VJ10000-TE - R.F. Tube Amplifier
FRONT VIEW
16
15
14
13
12
11
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VJ10000-TE - R.F. Tube Amplifier
4
FIG. 2 REAR VIEW
1)
Rear cavity panel.
2)
Air filter panel.
3)
Pass-through power supply cables panel.
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4)
R.V.R. Elettronica S.r.l. (BO)
VJ10000-TE - R.F. Tube Amplifier
Instruments rear Panel.
FIG. 3 HINGED FRONTAL PANEL WITH TELEMETRY
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REF.
DESCRIPTION
VJ10000-TE - R.F. Tube Amplifier
1)
MULTIMETER:
Analog instrument for the measures of temperature,
filament voltage and current, anode voltage and current
and grid voltage.
2)
VOLTAGES SELECTOR:
Voltages selector for the measures of the following.
3)
FWD/REF SELECTOR:
Selector for forward / reflected power measure.
4)
POWER INSTRUMENT:
Analog instrument for the measure of the forward and
reflected power
5)
INSTRUMENT RESET:
Mechanical reset of analog instrument for the
measure of the forward and reflected power.
6)
ENCODER:
Encoder for telemetry connection (optional).
7)
ENCODER SWITCH:
Key switch to enable the telemetry (optional).
8)
EMERGENCY PUSH SWITCH: Emergency push switch to stop the equipment.
9)
TUNING KEY SWITCH:
Key switch to enable the motorized tuning.
10)
TIME FILAMENT DISPLAY:
Display for the screening of the pre-heating
filament time.
11)
R.F. SAMPLE:
Connector for R.F. signal test.
12)
HANDLE:
Handle to open the hinged panel
13)
DISPLAY:
Display for the screening of the equipment and
telemetry parameters (optional).
14)
HOURS COUNTER:
Equipment working hours counter
15)
VOLTAGES RESET:
Mechanical reset of analog instrument.
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VJ10000-TE - R.F. Tube Amplifier
FIG. 4 TOP VIEW DESCRIPTION
REAR PANELS
1)
Out connectors.
2)
hot air outlet.
3)
3"+1/8 R.F. output.
FRONT PANELS
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VJ10000-TE - R.F. Tube Amplifier
FIG. 5 PROTECTIONS CARD DESCRIPTION
1)
Utilities protection switch.
2)
Working parameters measurement card. This card picks up all electrical measures of the
power grid tube in order to send the requested signals toward the multimeter card, allarms
box and remote control/telemetry.
3)
General disconnecting switch.
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VJ10000-TE - R.F. Tube Amplifier
FIG. 6 R.F. CAVITY'S FRONT VIEW DESCRIPTION
1)
HIGT VOLTAGE SHORT CIRCUIT.
2)
VARIABLE CAPACITOR (MOVING SURFACE WITH FINGERS)
3)
KAPTON
4)
TEFLON RING TO PROTECT ELECTRIC ARC
5)
COLLAR FOR 4CX20000C TUBE
6)
TEFLON CAP WASHER(LOAD)
7)
TUNE LIMIT-STOP
8)
CAVITY INTERLOK
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VJ10000-TE - R.F. Tube Amplifier
FIG. 7 WATTMETER VIEW DESCRIPTION
1)
LOW PASS FILTER.
2)
WATTMETER.
3-6)
COVER THREAD BARS.
4)
AIR -FLOW CHIMNEY.
5)
TUNING MOTOR.
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VJ10000-TE - R.F. Tube Amplifier
FIG. 8 R.F. CAVITY LEFT SIDE VIEW DESCRIPTION
1)
LOW PASS FILTER.
2)
3"+1/8 R.F. OUTPUT WITCH MOTOR LOAD.
3)
INPUT TUNING ADJUST -INPUT GRID ADJUST.
4)
VG1 INPUT VOLTAGE.
5)
VG2 INPUT VOLTAGE.
6)
THREAD BAR COVER
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VJ10000-TE - R.F. Tube Amplifier
FIG. 9 VOLTAGE STABILIZER DESCRIPTION
1)
ADJUSTABLE AUTOTRANSFORMER.
2)
SERVOMOTOR.
3)
CONTROL CIRCUIT.
4)
SOCKET.
5)
SERIES TRANSFORMER.
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VJ10000-TE - R.F. Tube Amplifier
FIG. 10 R.F. CAVITY'S REAR VIEW DESCRIPTION
1)
LOW PASS FILTER.
2)
3"+1/8 OUTPUT.
3)
FILAMENT TRANSFORMER.
4)
PRESSURE SENSOR
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VJ10000-TE - R.F. Tube Amplifier
FIG. 11 DETAIL REFERENCE
CAPSCREW
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Data redazione: 25/07/03
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VJ10000-TE - R.F. Tube Amplifier
CHAPTER 3
INSTALLATION
3.1 INTRODUCTION
This chapter contains the information necessary for the installation and preliminary checks
of the VJ10000-TE Triode amplifier.
3.2 UNPACKING
Remove the unit from its packing and, before anything else, ensure that the unit has not
suffered any damage during transit and that all front panel controls are operational.
3.3 ASSEMBLY DESCRIPTION
RECOMMENDED TOOLS FOR THE INSTALLATION OF VJ10000-TE
N_ 1
N_ 1
N_ 1
N_ 1
N_ 2
N_ 2
N_ 1
N_ 1
N_ 1
N_ 1
N_ 2
Middle star screwdriver
Small star screwdriver
Middle slot screwdriver
Big slot screwdriver
Double head wrench N_10
Double head wrench N_13
Socket wrench N_7 about L= 30 cm
Socket wrench N_8
Socket wrench N_13
Setscrew wrench for screws M6 (ALLEN)
Setscrew wrench for screws M8 (ALLEN)
3.4 ASSEMBLY PROCEDURES FOR THE INSTALLATION OF VJ1000-TE
After you have removed two racks from the wooden packing, is advisable to remove all
covers and to place one rack near to the other in vertical position. Then, you must connect
the two racks by the apposite cap screws that are fixed on the rear part of the rack with n°4
Allen scrwes M8.(fig.8)
These cap screws must be placed on the uprights of the racks, two of them on the top
position and two on the down position.
To execute this operation it’s necessary to check that two racks are on the same plane to
avoid problems in their alignment.
Then, it’s necessary to connect the wires, between the two racks, on the socket placed on the
bottom part of the rack being carefully to respect the position of wires.
Now, you must connect the wires that supply the multimeter with the DB25 connector of the
card placed on the left side of the multimeter on the R.F. cavity Before to work on this card
it’s advisable to remove the left cover of the Radio frequency group rack.
Inside of one of other packing they are three pipes with graduate flange, that must be placed
on the upper part of the cavity as protection of the bar that are used for the tuning.
There are three pipes (used to cover the bars) with the same lenght and one with a hole d=
12mm that must be used to cover the bar over end tuning micro switches.
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VJ10000-TE - R.F. Tube Amplifier
To mount this pipe is advisable to remove the micro switches before by the relative screws.
The screws that must be used to fix this pipe are just mounted in the relative holes placed on
the top of the cavity.
Now, you can connect the wires relative to the power supply of the blower’s motor, with the
same sequence marked bothon the wires and on the motor’s poles (ABB).
In this moment you are ready to connect the mains voltage wires to the equipment.
To realize this operation you must connect the three phases to the fuses opening the relative
fuses socket placed on the rear part of power supply rack and by a slot screwdriver you must
turn the screw placed on his bottom part.
Now, you can remove the poles protection discovering the screws and by a socket wrench
N°13 you can connect the mains voltage wires by the apposite wire terminals that is
supplied to you inside of the spares box, while the neutral and ground wire must be
connected to the poles placed near to fuses box marked rispectively with blu and yellowgreen colors.
It’s very important to check that when you switch on the equipment the fblower motor is on,
otherwise you must check the exact positions of the phases wires so that the overload cutout
can allow to start the equipment.
Another confirmation of this you can have from the led of the three-phases controller that
normaly is of green color, naturally with the automatic switch placed in the front panel in
the position ON.
Remember to connect the RF connector on the 1/2" Celflex cable to the 7/16" connector
placed on the input cavity under the input air cavity pipe.
To complete the assembling of the equipment it’s necessary to mount output air chimney
with the BNC connector forward the rear part because to this connector must be connected
the BNC mounted on the RG58 cable of the output air temperature probe.
Then, to complete the mounting of the chimney fix the screws on his top
part.
When you complete this operation and re-check all wires and cables, you can continue with
the other operations.
3.5 TRANSMITTER CONNECTION TO MAINS VOLTAGE
The transmitter connection to the mians voltage is placed in the rear part of the rack
(fig.1B).
The wires of mains voltage must be connected in this way: the three phases must be fixed to
three anchorages present on the high power fuses socket.
When is connected to electrics line is necessary do attention. The amplifier can expose the
operator to current and voltage dangerous.
After the connection to the electric line it is necessary make a control.
After the connection to the electric line is necessary make a control. Looking the apparatus
in the rear of the power rack ( 50cm height ), is possible to see leds power reveling the
correct operation. If led's is not turned on is present possibles anomalies
Wrong position of phases or absence current. Then immediately lift for some instants the
general interrupter on the frontal panel. If the overload cutout doesn’t remain active, to be
sure that the mains voltage is correct or that the blower isn’t blocked.
When finish these operations the connection to the electric line is completed.
The neutral and the ground must be connected to the wires connections placed near to fuses
socket. Connect the mains voltage cables in according to DELTA or STAR installation.
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VJ10000-TE - R.F. Tube Amplifier
In case of DELTA configuration isn’t necessary the neutral connection while for STAR
configuration the neutral connection is necessary too.
The three phases connection cables must have minimum section of 25 mmq for a voltage of
380/415 V and must have minimum section of 35 mmq for a voltage of 208/240 V.
The ground connection must be executed by a cable with a section of 35mm2.
The main switch (monophase) present on the front panel switch off only the power supply of
the services with small energy absorption but not the completely high power line.
WHEN THE EQUIPMENT IS CONNECTED TO THE MAINS VOLTAGE IT’S
NECESSARY TO BE VERY CAREFULLY BECAUSE THE INTERNAL PARTS OF
EQUIPMENT CAN CAUSE THE DEATH OF THE OPERATOR FOR FULGURATION.
After the connections to the mains voltage it’s necessary to realize a small checking.
Looking at the equipment in the rear part of the power supply rack (at the height of the knee)
it’s possible to see a three phases controller with led indicator ON.
If this led is OFF there is the possibility to have one of the following two anomalies: the first
is that is absence the mains voltage, the second is that one phase version isn’t correct.
For this last case is sufficient to change the position of two phases wires.
With the mains voltage present, you must switch on the main switch on the front panel for
few seconds and then switch off again the main; during these few seconds check the rotation
verse of the blower.
If the rotation isn’t correct, it’s necessary to inverte the position of two of the power supply
wires placed on the main metre of the blower.
When you have ended these operations, the connection to the mains voltage is completed.
3.5 TUBE INSTALLATION
Only when the equipment is correctly connected to mains voltage it’s possible to install the
tube inside of the RF cavity of the amplifier.
The power supply is necessary to allow to the tuning meter to move some mechanical parts,
but it’s necessary to switch off the main blower before
to start the operation on the RF cavity.
On the front panel of the right rack, open the panel that allows the inspection of the
electronic cards, the fuses and the protection switch of the blower.
Place on OFF position the protection switch of the main blower (on the top position in the
right side). Open the cover panel of the R.F. cavity placed on the top of the left rack
(fig.9A). It isn’t necessary to open other panels of the cavity. Switch on the power supply
by the main switch placed on the front panel of the right rack. Move one of the four tuning
commands (on the top in the right side) so that the grounded bridge (plate tuning) inside of
the RF cavity reaches the highest position possible.
Realise the plate tuning pipe clamp placed on the top of the RF cavity. With hands push up
the plate tuning pipe until it’s inserted in the grounded bridge. The pipe must be pushed up
until remains free a sufficient space to insert the tetrode inside the socket (fig.9B).
When the pipe is on the top position, clamp the clip of the pipe so that is fixed in this
position. Take the tube from one of the other packing paying more attention to: don’t touch
with free hands the ceramic parts of the tube, and don’t cause damages with big crashes.
Now, insert the tube inside the relative socket, and check if the position is correct inside the
fingers of the socket. When the position is correct, realise the clip of the pipe until the
position of the antenna coupling capacitors are parallel both in vertical and radial position.
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VJ10000-TE - R.F. Tube Amplifier
Make sure that the contacts between pipe and tube, clamping verywell the clip placed on the
bottom part of the tuning pipe (fig.9C). Then, clamp the other clip placed on the top of the
tuning pipe. Check inside the R.F. cavity so that there aren’t anything and then close the
cover. Switch off the equipment and then place on the ON position the protection switch of
the blower.
Now, after these operations is possible to close all covers and panels.
3.7 TUNING AND SWITCH ON PROCEDURES
The high power switching on operations must be executed only when you have ended all
other operations, placing mains voltage and antenna connections.
PAY PARTICULAR ATTENTION TO THE ANTENNA CONNECTION, because it isn’t
admitted, when you work with radio frequency systems, to use a connection to a non
adequate antenna or to not sure connections.
For the frequency tuning operations on the equipment is useful to have a spectrum analyzer,
but it’s possible to operate in any case with the help of the measures available on the front
panel, but the time necessay is longer.
Before to switch on the equipment verify that the modulator is setted for the minimum
output power, then it’s necessary to set the indicator meters of the variuos equipment for the
reading of the following parameters: Reflected power for the driver and VG1, VG2, IA and
Forward power for the final amplifier.
At the moment of the switching on, the transmitter executes a sequence of programmed
operations. If all prestart parametrs are correct, a warm-up timer ends its counting after 90
seconds. Then, the equipment is ready to start the working at high power.
Set the service switch on the stand-by position; with this operation the anode and grid 2
power supply are inserted in two different steps at 2 seconds one from the other, at last, is
enabled the modulator working.
In this transmitter configuration, the tube is supplied on the anode; for this reason it’s
impossible to detect a small anode current of 100/200 mA.
Increase slowly the output power of the modulator by its control power.
Check that the modulator reflected power remains under 40/60 W.
Then, increase again the driver output power until the anode current is 350/450 mA.
If the reflected power is greater than 40/60 W, make various attempts alternatively on the
two regulations of the input tuning of tetrode (on the bottom position) until this value is
correct. When on the tetrode is possible to detect an anode current of 350/450 mA, adjust the
tetrode output tuning (on the top in the right side) moving the push forward to (+) position
until compares a reflected power indication in antenna.
Adjust this push button forward to (+) or (-) for the indication of the maximum relative
power in antenna. Increase lightly the modulator power checking and correcting always the
input tunings of the tetrode until to obtain the minimum value of the driver reflected power.
After the frequency tuning operation of tetrode, is necessary to execute the according
antenna operations. This last operation is advisable when the output power has exceed the
value of 8-10 KW. If tetrode isn’t correctly according to antenna, the values of the anode
current and the two grids currents aren’t correct, and in this case the amplifier doesn’t
increase the output power with a relative increase of the input power.
The push button of antenna tuning (on the top in the left side) allows to correct the IA, IG1,
and IG2 currents values in according to output power. Each once it’s been necessary to
adjust the antenna coupling (push button on the top in the left side) IT’S ABSOLUTELY
NECESSARY TO ADJUST THE OUTPUT TUNING (push button on the top in the right
side) to obtain the maximum value of the forward power in antenna.
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VJ10000-TE - R.F. Tube Amplifier
Repeat this sequence of operations (increasing of the input power, correction of the input
tuning for the minimum value of the reflected power on the driver, adjusting of the antenna
coupling and final fine adjust of the tuning) until you have obtained the maximum
programmed output power.
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FIG. 12
VJ10000-TE - R.F. Tube Amplifier
TUBE INSTALLATION DIAGRAM N°1
NOTE: SCREWS FOR REMOTION FRONT PANEL
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FIG. 13
VJ10000-TE - R.F. Tube Amplifier
TUBE INSTALLATION DIAGRAM N°2
Plate pipe
Grid Plate
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VJ10000-TE - R.F. Tube Amplifier
REFERENCE WIEV FOR VALVE
INSTALLATION
INTO
CAVITY
CHAMBER.
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VJ10000-TE - R.F. Tube Amplifier
FIG. 14 TUBE INSTALLATION DIAGRAM N°3
Plate pipe
Grid Plate
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VJ10000-TE - R.F. Tube Amplifier
CLOSE THE SCREWS ON
PLATE VOLTAGE. BE SHURE
TO INSERT CORRECTLY THE
VALVE INTO CAVITY .
REFERENCE WIEV OF CAPACITY
LOAD
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VJ10000-TE - R.F. Tube Amplifier
CHAPTER 4
MAINTENANCE
4.1 SAFETY REQUIREMENTS
WARNING WARNING WARNING WARNING WARNING WARNING WARNING
When the transmitter is operational, removing the rear panel will expose lethal voltages.
Use insulated tools for all types of adjustment and do not touch any internal components
when the unit is switched on.
Ensure that the unit is disconnected from all sources of power before carrying out any inspection or
maintenance work.
MAINTENANCE LEVEL 1
4.2 ROUTINE MAINTENANCE
The only routine maintenance required by the amplifier is the periodic inspection of the
cooling fans, the replacement of the air filter and the removal of dust from the tube cavity.
The period between such action will depend on ambient operating conditions such as
temperature, air-borne dust levels and humidity. It is advisable to check the unit every 3
months, replacing worn or noisy fans.
Eventual replacement of the tube will also be necessary.
The life of the tube will depend strongly upon operating conditions: eg. line voltage
fluctuations greater than ± 5%, ambient temperature greater than 30 oC, high humidity,
presence of dust and misalignment of the amplifier will all lead to a greatly reduced tube
life.
MAINTENANCE LEVEL 2
4.3 MODULE REPLACEMENT
N.B. TO FIT A MODULE, FOLLOW THE REMOVAL PROCEDURE IN REVERSE.
N.B. THESE PROCEDURES SHOULD ONLY BE CARRIED OUT BY HIGHLY SPECIALIZED
TECHNICIANS USING THE CORRECT EQUIPMENT.
MAINTENANCE ERRORS CAN CAUSE SERIOUS DAMAGE TO THE UNIT AND WILL
AUTOMATICALLY MAKE THE WARRANTY VOID.
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VJ10000-TE - R.F. Tube Amplifier
4.4 TUBE REPLACEMENT
1)
Move the sliding panel to its upper limit (rods fully exposed), using the PLATE control.
2)
Disconnect the line supply from the unit.
3)
Ensure that the tube has cooled sufficiently to avoid severe burning.
4)
Ensure that all internal voltages are at 0V; use a shorting-stick, if necessary.
5)
Unscrew the fixing screws of the front, hinged access panel of the chamber (fig.9A).
6)
Unscrew the fixing screws of the chamber panel (fig.9A).
7)
Remove the air outlet flue with the protective net (fig.9B).
8)
Loosen the anode tube fixing collar (fig.9B).
9)
Raise the anode tube as far as possible and keep it in that position.
10)
To re-fit the tube, follow the procedure described in paragraph 3.6, Tube Installation.
4.5
AIR FILTER REPLACEMENT
1)
Disconnect the line supply from the unit.
2)
Open the rear grill (1 fig.1B) of the air filter, undoing the fixing screws.
3)
Change the felt air filter, carefully cleaning inside.
4)
Close the rear grill and tighten the fixing screws.
5)
Reconnect the line supply.
APPENDIX A
CIRCUIT DIAGRAMS, LAYOUTS AND BILLS OF MATERIAL
This section contains circuit diagrams, layouts and bills of material of the modules which
composing the equipment.
For more information about each module see as reference Section 2.
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VJ10000-TE - R.F. Tube Amplifier
FIG. 15 I/O RACK CONNECTORS
A)
B)
I/O Rack Connectors.
Reference View.
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VJ10000-TE - R.F. Tube Amplifier
FIG. 16 I/O RACK CONNECTORS
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FIG. 17
VJ10000-TE - R.F. Tube Amplifier
REFERENCE VIEW
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VJ10000-TE - R.F. Tube Amplifier
FIG. 18 R.F. CIRCUIT
A)
Circuit Diagram.
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R.V.R. Elettronica S.r.l. (BO)
FIG. 19
A)
B)
VJ10000-TE - R.F. Tube Amplifier
MEASURE CARD
Circuit Diagram.
Layout.
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FIG. 20
A)
VJ10000-TE - R.F. Tube Amplifier
380V CIRCUIT
Circuit Diagram.
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FIG. 21
A)
LOW TENSION CIRCUIT
Circuit Diagram.
FIG. 22
A)
VJ10000-TE - R.F. Tube Amplifier
MEASURE, ALLARMS, LOW-TENSION CIRCUIT
Circuit Diagram.
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R.V.R. Elettronica S.r.l. (BO)
FIG. 23
B)
C)
VJ10000-TE - R.F. Tube Amplifier
POWER RELAY CARD
Circuit Diagram.
Reference View
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FIG. 24
VJ10000-TE - R.F. Tube Amplifier
REFERENCES VIEW
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VJ10000-TE - R.F. Tube Amplifier
FIG. 25 INTERFACE TELEMETRY CARD
A)
Circuit Diagram.
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VJ10000-TE - R.F. Tube Amplifier
FIG. 26 TUNINGS RELAY CARD
A)
B)
Circuit Diagram.
Reference View.
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FIG. 27
VJ10000-TE - R.F. Tube Amplifier
REFERENCES VIEW
APPENDIX B
CONSTRUCTION DETAILS AND COMPONENTS DESCRIPTION
This appendix contains construction details, cables numeration and of some components
description which composing the equipment.
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FIG. 28
VJ10000-TE - R.F. Tube Amplifier
POWER SUPPLY P1
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FIG. 29
1)
VJ10000-TE - R.F. Tube Amplifier
SECTIONAL VIEW OF THE POWER SUPPLY P1
SOCKET OF THE ANODE SUPPLY TRANSFORMER
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FIG. 30
VJ10000-TE - R.F. Tube Amplifier
POWER SUPPLY P2
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FIG. 31
VJ10000-TE - R.F. Tube Amplifier
SECTIONAL VIEW OF THE POWER SUPPLY P2
1
BLOWER
2
FILAMENT TRANSFORMER
3
RESISTORS
4
INDUCTOR
5
POWER SOCKET
6
CAPACITOR
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FIG. 32
VJ10000-TE - R.F. Tube Amplifier
PROTECTIONS PLANE
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FIG. 33
VJ10000-TE - R.F. Tube Amplifier
REFERENCE VIEW
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FIG. 34
VJ10000-TE - R.F. Tube Amplifier
RESISTORS PLANE
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FIG. 35
VJ10000-TE - R.F. Tube Amplifier
RESISTORS PLANE
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FIG. 36
VJ10000-TE - R.F. Tube Amplifier
REFERENCE VIEW
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FIG. 37
VJ10000-TE - R.F. Tube Amplifier
TUNING MOTOR LOAD
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FIG. 38
VJ10000-TE - R.F. Tube Amplifier
REFERENCE VIEW
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FIG. 39
VJ10000-TE - R.F. Tube Amplifier
RHEOSTATS
INTERNAL VIEW
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FIG. 40
VJ10000-TE - R.F. Tube Amplifier
REFERENCE VIEW
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FIG. 41
VJ10000-TE - R.F. Tube Amplifier
PJ1000 PROTECTION SWITCH - PROTECTION FUSES
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FIG. 42
VJ10000-TE - R.F. Tube Amplifier
REFERENCE VIEW
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FIG. 43
VJ10000-TE - R.F. Tube Amplifier
INPUT SOCKET
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FIG. 44
VJ10000-TE - R.F. Tube Amplifier
REFERENCE VIEW
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R.V.R. Elettronica S.r.l. (BO)
FIG. 45
UTILITIES SOCKET
FIG. 46
REFERENCE VIEW
VJ10000-TE - R.F. Tube Amplifier
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R.V.R. Elettronica S.r.l. (BO)
FIG. 47
VJ10000-TE - R.F. Tube Amplifier
HIGHT TENSION PANEL
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R.V.R. Elettronica S.r.l. (BO)
Filament Transformer
cable n° 116 (0V) in
cable n° 113 (220) in
cable HT out
cable HT out
Utilities Transformer
cable n° 155 (0V) in
cable n° 154 (220V) in
cable n° 157 HT (12V) out
cable n° 158 HT (0V) out
cable n° 156 HT (12V) out
Insulated Transformer
cable n° 155 (24V) in
cable n° 156 (0V) in
cable n° 30 (12V) out
cable n° 31 (0V) out
Pressure Sensor
cable n° 11
cable n° 13
Tuning Motor Tune
cable n° 88 (+)
cable n° 89 (-)
Hours Meter
cable n° 65
cable n° 63
Safety Button
cable n° 58
cable n° 57
VJ10000-TE - R.F. Tube Amplifier
© Copyright 2001
R.V.R. Elettronica S.p.a. (Bo)
Via del Fonditore 2/2c - 40138 - Bologna (Italy)
Telephone: + 39 - 51 - 6010506
Fax: + 39 - 51 - 6011104
e-mail: [email protected]
www.rvr.it
Printed and bound in Italy. All rights reserved. No part of this manual may be reproduced or
utilized in any form or by any means, electronic or mechanical, including photocopying, recording,
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VJ10000-TE - R.F. Tube Amplifier
or by any information storage and retrieval system, without permission in writing from the
publisher.
80
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