R.V.R. Elettronica PJRL250 User manual

Manufactured by R.V.R. Elettronica - Italy
TECHNICAL AND MAINTENANCE MANUAL
PJRL250

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 2
PJRL250 POWER MOSFET AMPLIFIER 215-
225 MHz RANGE
Technical and Maintenance Manual
English Pag. 3

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 3
INDEX
Preliminary Instructions and Warranty Information Pag. 5
Safety Regulations Pag. 7
SECTION 1
PJRL250 Description Pag. 10
Technical Specifications (Table A) Pag. 12
Dimensional & Environmental Specifications (Table B) Pag. 13
SECTION 2
Electrical Description Pag. 14
Front Panel Description Pag. 16
Front Panel View (Fig.1) Pag. 17
Rear Panel Description Pag. 18
Rear Panel View (Fig.2) Pag. 19
Top View Description Pag. 20
Top View (Photo 1) Pag. 21
Block Diagram (Fig.3) Pag. 22
Recommended Test Equipment (Table C) Pag. 23
SECTION 3
Installation Procedures Pag. 24
SECTION 4
Maintenance Pag. 26
SECTION 5
Internal Adjustments Pag. 29
APPENDIX A
Circuit Diagrams, Layouts and Bill of Material Pag. 34
Wiring Diagrams Pag. 35
Alarms Card Pag. 38

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 4
Telemetry Card (Ver. PROT-A2) Pag. 44
Power Supply (Vers. 1.7) Pag. 48
Soft Start Card Pag. 56
R.F. Module Pag. 60
Low Pass Filter & Directional Coupler Pag. 65

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 5
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 electronic 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:
1) Re-shipment of the unit to R.V.R. for repair purposes
2) Any unauthorized repair/modification
3) Incidental/consequential damages as a result of any defect
4) Nominal non-incidental defects
5) 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.

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 6
To claim your rights under this warranty:
a. Contact the dealer or distributor where you purchased the unit.
Describe the problem and ask if he has an easy solution. Dealers
and Distributors are supplied with all the information about prob-
lems 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),
until the package reaches R.V.R. premises. For this reason, we sug-
gest 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 ser-
vice 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.r.l. -
Broadcasting Equipment -
Via del Fonditore, 2/2c
40138 Bologna - Italy
R.V.R. reserves the right to modify the design and specifications of the
equipment in this manual without previous notice.

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 7
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.r.l. 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

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 8
Treatment 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, IF NOT BREATHING,
OPEN AIRWAY BEGIN ARTIFICIAL
BREATHING.
LIFT UP NECK, TILT HEAD,
PUSH FOREHEAD BACK, PINCH NOSTRILS,
CLEAR OUT MOUTH IF NECESSARY, MAKE AIRTIGHT SEAL,
OBSERVE FOR BREATHING 4 QUICK FULL BREATHS.
REMEMBER MOUTH TO MOUTH
RESUSCITATION MUST BE
COMMENCED AS SOON AS
POSSIBLE.
C CIRCULATION
CHECK CAROTID PULSE DEPRESS STERNUM 1 1/2" TO 2"
IF PULSE ABSENT, APPROX. 80 SEC. : ONE RESCUER, 15 COMPRESSIONS,
BEGIN ARTIFICIAL 2 QUICK BREATHS.
CIRCULATION APPROX. 60 SEC. : TWO RESCUERS, 5 COMPRESSIONS,
1 BREATH
NOTE: DO NOT INTERRUPT RHYTHM OF COMPRES-
SIONS WHEN SECOND PERSON IS GIVING BREATH.
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).

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 9
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. Cover area with clean sheet or cloth.
(Cleansed available cloth article).
b. Do not break blisters, remove tissue, remove adhered particles of
clothing, or apply any salve or ointment.
c. Treat victim for shock as required.
d. Arrange transportation to a hospital as quickly as possible
e. 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 cleansed 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.

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 10
SECTION 1
PJRL250 DESCRIPTION
1.1 EXTERNAL DESCRIPTION
The PJRL250 is housed in a 3U 19" rack completely assembled with modules
fitted on main rails, wired with connectors allowing easy servicing and
replacement.
On the front panel the alarm indicators, the mains switch and the meter for
the principal parameters.
On the rear panel the RF INPUT and RF OUTPUT connectors are located, together
with the telemetry connector, the RF output test connector (directional
coupler), the mains socket the fuses and an auxiliary mains line output for
the supply of other exciters of a different design and make.
1.2 ELECTRICAL DESCRIPTION
PJRL250 is a MOSFET power amplifier working on the 215-225MHz band with
an output power in excess of 250W and a drive level of about 10-12W.
This amplifier uses one RF module able to deliver more than 250W, with switching
power supplies for high efficiency.
A built in low pass filter suppresses the harmonic content below the FCC and
CCIR requirements.
A protection system takes care of the amplifier against thermal problems,
excessive input drive power and excessive SWR inside the amplifier or along
the feeder. This system provides an automatic reset to initial conditions when
the problem ceases.
1.3 METERS AND INDICATORS
The principal parameters of the amplifier are read by the analog multimeter
(9 Fig.1) and selected by the rotary switch (8 Fig.1) on the front panel.
Various led indicators indicate the alarm conditions (7 Fig.1).
The push-button (3 Fig.1) resets the counting circuit of the protection
circuit.
An indicator confirms the presence of the mains voltage (5 Fig.1).
The ON led (2 Fig.1) indicates the amplifier is working, EXT. ST.BY led (1
Fig.1) indicates an external lock and a wait state of the amplifier.
1.4 AUTOMATIC LEVEL CONTROL
An unused characteristic of this amplifier is the outstanding power gain;
indeed without preamplifiers we have an output power of 250W with a drive of
only 10-12W.
A power limiter stabilizes the output power against input drive fluctuations.

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1.5 PROTECTION CIRCUITS
The protection circuits set the amplifier in stand-by in the case of a
fault condition.
After 10 seconds the protection reactivates the amplifier if the fault has
disappeared.
If not, this process is repeated 4 times at the end of which the amplifier
stays disabled for few minutes; after few minutes, if the trouble persists
the protection performs other four cycles and then disable the amplifier
indefinitely.
If during these cycles the anomaly disappears and the amplifier works regularly
for more than few minutes the counting system is reset and the original
conditions established.
(NOTE The intervals described are indicative)
The protection acts for excessive SWR (the Internal SWR alarm is not actived),
over-temperature and overdrive, indicates the problem with warning lights and
disables the pilot exciter.
1.6 R.F. POWER AMPLIFIER MODULE
The amplifier employs the broadband modules with 50 Ohm input/output
impedance (SMA connectors).
The output power of module is 250W with 10W of drive.
1.7 DEVICE SPECIFICATIONS
Refer to Table A for electrical specifications, and to Table B for
dimensional and environmental specifications.
SECTION 2

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 12
TABLE A
TECHNICAL SPECIFICATIONS
A.C. Supply 100-130 V, 50-60 Hz
198-250 V, 50-60 Hz
Cooling Forced Ventilation
Frequency Range from 215 to 225 MHz
Power Output 250 W
R.F. Drive Power approximately 10-12W for
Pout=250 W
R.F. Input Connector Standard "N" type connector
R.F. Input Impedance 50 Ohm
R.F. Output Impedance 50 Ohm
R.F. Ouput Connector Standard "N" type connector
Spurious & Harmonic Suppression meets or exceeds all FCC and
CCIR requirements

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 13
TABLE B
DIMENSIONAL AND
ENVIRONMENTAL
SPECIFICATIONS
Cabinet Dimension 126 mm (04.96") H
437 mm (17.20") W
340 mm (13.39") D
Panel Size 483 mm (19.00") W
132.5 mm (5.22") H
Operating Temperature -10°C to 50°C
Humidity 95% Max, Non Condensing
Weight 21Kg

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ELECTRICAL DESCRIPTION
This section describes the overall working theory of the PJRL250.
For case of description the amplifier is subdivided into subassemblies that
will be discussed in detail below.
The block diagram is illustrated in Fig.3.
2.1 POWER SUPPLY
The switching power supply (2 Photo 1) fitted to the supporting rails and
is accessible from the upper part of the amplifier as shown in Photo 1.
A mains transformer has a selectable input for voltages between 110,120,220
and 240 Volt and two outputs: A 30+30 Volt, B 18+18 Volt.
The A output drive the switching power supply unit that generate the
50 Volt needed by the RF module.
Output B supplies the soft-start circuit and the ALARMS CARD.
Inside the ALARMS CARD a rectifying and stabilization circuit provides the
+15 and -15 Volt needed by the electronics.
The 50 Volt switcher regulate the RF output power using a voltage detected
by a directional coupler mounted inside the low pass filter box.
2.2 SOFT START
The soft start (6 Photo 1) eliminates the current spikes generated by the
transformer when it is powered.
2.3 R.F. POWER AMPLIFIER MODULE
The R.F. power amplifier module (4 Photo 1) are placed in the right side
of the PJRL250. This module is totally shielded and placed on a heat sink as
shown Photo 1.
The R.F. power amplifier module delivers 250W with 10W of drive and is supplied
by an switching power supply.
The quiescent parameters of module are:
VDC=50V Idq=400mA
The active device employed is a Mosfet (BLF378).
2.4 LOW PASS FILTER
This filter (1 Photo 1) is fitted in a metallic box mounted on the internal
chassis in the position shown in Photo 1 .
Thanks to this low pass filter we have a harmonic suppression of more than
75 dB.

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2.5 ALARMS CARD
This module (3 Photo 1) is composed of a board mounted on the front panel,
in left position, as shown in Photo 1.
On this board, the electronics detect any system anomaly such as excessive
SWR antenna (the internal SWR is not actived); over-temperature etc.
This module will also, whenever possible, reset the system to its original
conditions, after a fault has accused.
2.6 TELEMETRY CONNECTOR
The telemetry connector (3 Fig.2) is placed on the rear panel in the right
side as shown in Fig.2.
Thanks to this connector the essential parameters of the amplifier are
externally available for remote measurements purposes.
TELEMERY CARD MOD.2 (VER. PROT-A2)
PIN NUMBER SIGNALS TELEMETRY VOLTAGE LEVEL
4 Reflected Power 1.6V for 40W
5 Inhibit Tx 12V
6 Internal SWR Not Actived
8 Operate 15V
14 R.F. Module's Voltage 2.0V for 50V
15 R.F. Module's Current 2.0V for 10A
16 Forward Power 1.4V for 300W
17 Temperature 15V when fault
18 Antenna SWR 15V when fault
19 Over Drive 15V when fault
20 Stand By 15V
3,7,21 Ground 0V
The Pin 1-2 are internally connected, the other pin are not used.
SECTION 3
INSTALLATION OPERATIONS

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FRONT PANEL VIEW DESCRIPTION (FIG. 1)
1 EXT. ST. BY Led indicating an External Stand-By
2 ON A.C. ON Power indicator
3 ALARMS RESET Press-button to reset the alarm status
4 ON/OFF POWER On/Off Power Switch
5 LINE A.C. Line Indicator
6 AIR FILTER Air filter of R.F. Amplifier Module
7 ALARMS Leds indicating the PJ501-M’s
alarms status
8 METER SELECTOR Selector to monitor operating
parameters:
V R.F. Ampl. Module’s voltage
OFF Not Used
I R.F. Ampl. Module’s current
OFF Not Used
REF Reflected Power
FWD Forward Power
9 METER Analog meter used to monitor the
operating parameters of the amplifier

PJRL250 Technical and Maintenance Manual
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FIG. 1

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 18
REAR PANEL VIEW DESCRIPTION (FIG. 2)
1 FAN Forced ventilation
2 R.F. TEST -60dB -60dB with respect to the Output Level
3 TELEMETRY CONNECTOR Connectors for remote measurement of
operating parameters.
4 R.F. INPUT Input R.F. connector ("N" Type)
5 R.F. OUTPUT Output R.F. connector ("N" Type)
6 VOLTAGE CHANGER & Fuse block and line voltage selector.
A.C. LINE FUSE Use a small screwdriver to change the
fuse or the line voltage. Rotate the
block and position it for the desired voltage.
7 MAINS VOLTAGE A.C. Power Line for amplifier
8 R.F MODULE FUSE Protection fuse for R.F. Module
9 A.C. LINE FOR EXCITER A.C. Power Line for exciter
10 ALARMS/INTERLOCK BNC connector which permits the exciter
to be put in stand-by, in case of
amplifier fault or in case of EXT.ST.BY.

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FIG. 2

PJRL250 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 20
TOP VIEW DESCRIPTION (PHOTO 1)
1 ......................... Low Pass Filter
2 ......................... Power Supply
3 ......................... Alarms Card
4 ......................... R.F. Power Amplifier Module
5 ......................... Transformer
6 ......................... Soft-Start