R.V.R. Elettronica RXRL-NV User manual

TECHNICAL AND MAINTENANCE MANUAL
MANUALE TECNICO E DI MANUTENZIONE
Manufactured by R.V.R. Elettronica - Italy
RXRL-NV

RXRL-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 2
RXRL-NV
STUDIO TRANSMITTER LINK 200/
1100MHz
Technical and Maintenance Manual
Manuale Tecnico e di Manutenzione
English Pag. 3
Italiano Pag. 49

RXRL-NV 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
General Description Pag. 10
Technical Specifications (Table A) Pag. 12
Dimensional & Environmental Specifications (Table B) Pag. 13
CHAPTER 2
Electrical Description Pag. 14
Front Panel View Description Pag. 17
Front Panel View (Fig.1) Pag. 20
Rear Panel View Description Pag. 21
Rear Panel View (Fig.2) Pag. 23
Top View Description Pag. 24
Top View (Photo 1) Pag. 25
Block Diagram (Fig.3) Pag. 26
CHAPTER 3
Installation Procedures Pag. 27
Recommended Test Equipment (Table C) Pag. 30
CHAPTER 4
Maintenance Pag. 31
CHAPTER 5
Calibration Procedure of Modules Pag. 35
CHAPTER 6
Alignement of the Radio Link Pag. 43
APPENDIX A
Circuit Diagrams, Layouts and Bill of Meterials Pag. 95

RXRL-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 4
Card Connections Pag. 96
Power Supply Pag. 97
Muting Card Pag. 102
C.P.U. Pag. 106
Modmeter Card Pag. 116
Anameter Card Pag. 121
P.L.L. Card Pag. 129
V.C.O. Card Pag. 141
I.F. 70MHz Card Pag. 146
Front End & Mixer Pag. 152
Inverter Card Pag. 159
U.S.A. Input Audio Card (Optional) Pag. 163
Mono-Balanced Card (Optional) Pag. 167

RXRL-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 5
PRELIMINARY INSTRUCTIONS AND WARRANTY INFORMATION
WARNING: This equipment is a "CLASS A" equipment. In a residential place
this equipment can cause hash. In this case can be requested to user to
take the necessary measures.
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 responsibility 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.

RXRL-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 6
The warranty for a period of 12 months is referred to any R.V.R. product,
while for products as transistors, Mos-Fet and tubes of the final stages
is applied the manufacture's warranty of these devices.
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
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),
until 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.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.

RXRL-NV 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

RXRL-NV 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 COMPRESSIONS
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).

RXRL-NV 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.

RXRL-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 10
SECTION 1
GENERAL DESCRIPTION
1.1 MECHANICAL DESCRIPTION
The RXRL-NV is housed in a 2U, 19" rack-mounting chassis comprising
a number of interconnected modules mounted internally on the base of the
unit.
This allows easy removal and replacement of each module.
The audio output level controls (Mono and Stereo) and meters for various
operating parameters are situated on the front panel.
Mains power, II° I.F. Monitoral Output, R.F. input connectors are mounted
on the rear panel.
1.2 ELECTRICAL DESCRIPTION
The RXRL-NV is a hight quality, broadband, FM receiver with a
harmonic distortion better than 0.2%.
The receiver is microprocessor-controlled and synthesized with steps of
100KHz in the 200-1100MHz band.
Furthermore, a 15Hz low-pass filter is provided which may be inserted
in the MONO or MPX output.
1.3 METERS AND INDICATORS
The receiver’s operating parameters can be measured with the analog
multimeter (21 Fig.1) and the led bar-graph display (18 Fig.1) situated
on the front panel.
The measurament being made by the analog multimeter is indicated by a
led indicator (8 Fig.1) and selectable via the corresponding control
(20 Fig.1).
Peak deviation can be measured with the bar-graph display in steps of
5KHz.
The five-figure display (22 Fig.1), mounted centrally, indicates the
operating frequency selected by the UP (14 Fig.1) and DOWN (12 Fig.1)
controls and saveable with the ENTER (13 Fig.1) control.
Three leds provide indication of VCO locked (10 Fig.1), the presence of
a stereo signal (9 Fig.1) and the presence of an SCA
signal (11 Fig.1) if the optional decoder is fitted.
1.4 REMOTE FREQUENCY CONTROL
The RXRL-NV attains frequency lock within a maximum of 30 seconds
after power-up.
An optional serial port (9 pin D-type) is available allowing remote
control of operating frequency and audio muting.

RXRL-NV Technical and Maintenance Manual
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1.5 SPECIFICATIONS
Please refer to Table A for the electrical specifications and
Table B for the mechanical specifications.

RXRL-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 12
TABLE A
ELECRICAL SPECIFICATIONS
A.C. Power 100,120,220 and 240 V ±10%
50-60 Hz, single phase 22W
24 Vdc optional
Cooling Forced ventilation
Operating frequency from 200 to 1100 MHz in Sub-Bands of
25MHz
Sensitivity MPX: 1.00mV or less for 60dB SNR
Mono: 100µV or less for 65dB SNR
Selectivity ±100 KHz at -3 dB
±350 KHz at -70 dB
Total harmonic distortion < or = 0.2%
Stereo separation 45 dB, from 50Hz to 15KHz
Audio outputs MPX: +13 dBm, 600 Ohm unbalanced
Mono: +13 dBm, 600 Ohm unbalanced
Noise Figure approx. 6
GRAF OF RECEIVED SIGNAL STRENGHT VERSUS SIGNAL TO NOISE

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R.V.R. Elettronica S.r.l. (Bo) Pag. 13
TABLE B
DIMENSIONAL AND ENVIROMENTAL SPECIFICATIONS
Chassis dimensions 82 mm (3.22") H
326 mm (12.83") D
445 mm (17.51") W
Panel dimensions 483 mm (19") W
88 mm (3.47") H
Ambient operating temp. from -10°C to +45°C
Humidity 90% maximum, non-condensing
Weight 20 Lbs (9 Kg)

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SECTION 2
ELECTRICAL DESCRIPTION
2.1 INTRODUCTION
This section describes, in detail, the operating theory of the
RXRL-NV.
To aid understanding, the unit has been subdivided into blocks, each of
which is fully described below.
A block diagram is shown in fig. 3.
2.2 POWER SUPPLY
This circuit consists of 1 board mounted on the right side of the
chassis base (2 Photo1).
The supply is designed to accept line voltages of 100V, 120V, 220V and
240V ±10% (24Vdc optional) at a frequency of 50-60Hz.
The power supply generates the stabilized voltages required by the
various modules comprising the RXRL-NV.
After having undergone filtering for mains-borne interference, the
supply is transformed to lower voltages, rectified, smoothed and
stabilised for the following outputs: +5V, +15V and -15V.
The +5V output supplies the CPU card and the P.L.L. card, whilst the ±15V
outputs supply the CPU card, the Modmeter card, the Anameter cards 1 and
2, the Front-end Mixer, the Audio Process card, the 70MHz IF card, the
PLL, the Muting card.
All supply voltages may be monitored by the analog multimeter.
2.3 CPU
The CPU is housed in a metal box and mounted on the right side of
the front panel (4 Photo1).
This circuit converts the number corresponding to the selected operating
frequency into binary code which is written to the programmable dividers
of the PLL.
This allows the VCO to lock to the desired operating frequency.
Several of the receiver’s parameters may be remotely controlled via an
optional 9 pin D-type serial port.
In the absence of mains power, a non-volatile memory maintains
indefinately the last frequency that was programmed.
2.4 MODMETER CARD
This card is mounted on the left side of the front panel (6 Photo1).
This circuit allows the deviation of the signal received by the Audio
Process card to be displayed by rectifying the audio signal.
The card has two BNC connectors; one for the mono signal and the other

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R.V.R. Elettronica S.r.l. (Bo) Pag. 15
for the stereo signal.
A switch allows the gain of the measuring circuit to be set to 10% or
100% for a more precise reading of low-level deviation (eg. SCA, RDS,
pilot tones).
Another switch sets the display mode to bar-graph or peak mode.
The display comprises 14 green leds and 6 red leds.
In the 100% display mode, each led represents 5KHz of deviation with the
first red led representing 75KHz and full scale at 100KHz.
In the 10% mode, each led represents 0.5KHz of deviation.
2.5 ANAMETER CARD
This circuit comprises two cards and a meter mounted centrally on
the front panel (5 Photo1).
This sub-assembly displays the values of various operating parameters
of the receiver: internal voltages and signal levels of MONO, MPX, STEREO,
SCA, CENTER (signal centering) and SIGNAL (signal amplitude).
The parameters are selected by a lever switch (20 Fig.1) and the selection
is indicated by the legend of the green led (8 Fig.1).
The readings are taken using the corresponding scale:
MEASUREMENT SCALE FDS
Internal voltages V 30 V
Signal levels V 1 mV
Three green leds indicate the presence of a STEREO signal, VCO lock and
the presence of a SCA signal (SCA PRES. and STEREO PRES. leds are working
only with the option decoder fitted).
2.6 FRONT-END MIXER
This card is enclosed in a metal container and mounted on the left
side of the rear panel (9 Photo1).
The RF input connector is part of this module.
The circuit receives the RF signal, amplifies it, and mixes it with the
signal generated by the VCO.
The difference signal obtained is supplied to the 70MHz IF card.
2.7 PLL
This card is mounted on the left side of the base of the unit
(9 Photo1).
The VCO is mounted on this card, enclosed in a metal container.
This circuit reads the binary equivalent of the frequency supplied by
the CPU. Its operation requires an external divider to process the
information received and sent on to the PLL.
The PLL compares the reference signal to the VCO signal and uses the
difference to lock the VCO to the operating frequency.

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2.8 AUDIO PROCESS CARD
This card is mounted in the rear of the metal container situated
in the center of the unit (11 Photo1).
The Audio Process card processes the various audio signals such as MONO,
MPX, SCA and RDS coming from the 70MHz IF card.
Furthermore, it supplies these processed signals to the various
instruments found on the Anameter and Modmeter cards.
The card also provides a signal for the Muting card which displays the
muting status and allows the adjustement of the intervention threshold
(factory calibrated to approx. -83 dBm).
2.9 70MHz IF CARD
This card is mounted at the front of the metal container situated
in the center of the unit (7 Photo1).
The circuit receives a 70MHz input which is filtered, amplified and then
mixed with a 59.3MHz signal generated by a quartz crystal.
The resultant 10.7MHz signal, being the difference of the above
frequencies, is filtered and amplified and supplied to the Audio Process
card for processing.
2.10 MUTING CARD
This card is mounted on the right side of the front panel and allows
adjustment of the receiver’s muting threshold (= -83 dBm of default) and
displays the muting status with a led (16 Fig.1).

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FRONT PANEL VIEW DESCRIPTION
(Fig.1)
1 LEVEL HEAR Hear level trimmer
2 HEAR Hear jack
3 MONO Mono output connector, BNC type
4 MONO LEVEL TRIMMER Mono Level Trimmer
5 STEREO LEVEL TRIMMER Stereo Level Trimmer
6 MPX Stereo output connector, BNC type
7 ON/OFF LPF\15KHz ON/OFF Low Pass Filter selector
8 LEDS Light indicator indicated which
parameter of the receiver is
being displayed on the analog meter
9 STEREO PRES. STEREO signal led indicator
(only with STEREO internal decoder
included)
10 LOCK This indicator will light when
the VCO is locked to the reference
frequency

RXRL-NV Technical and Maintenance Manual
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11 SCA PRES. SCA signal led indicator (only
with SCA internal decoder included)
12 DOWN Control frequency display. Any
momentary pushes causes the digit to
go down 10KHz a time
13 ENTER Enters the frequency on the display
into microprocessor and memory.
Once entered, the frequency is
stored until a new frequency is
entered on the front panel even if
the power is turned off for several
days
14 UP Controls the display frequency
in the same way as the "DOWN" button,
except that the frequency goes up in
10KHz steps
15 LEVEL MUTING Muting Level Trimmer
16 MUTING Muting led indicator
17 BAR/DOT Selector of operation mode (BAR/
DOT) for deviation meter
18 DEVIATION Deviation meter by "Led Diode Bar"
19 x1/x10 Expansion of modulation meter scale
Pos. X1 - Full scale shows 100%
Pos. X10 - Full scale shows 10%
20 METER SELECTOR Pushing the switch each time will
light on led at a time in upward
direction

RXRL-NV Technical and Maintenance Manual
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21 METER Analog meter used to monitor the
parameters of the receiver such as:
+15V
+5V
EXT 24V
SIGNAL
CENTER
SCA
MONO
MPX
22 FREQUENCY DISPLAY Frequency indicator
23 ON ON/OFF Power Switch Led
24 POWER ON/OFF Power Switch

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FIG.1