R.V.R. Elettronica URP User manual

Manufactured by R.V.R. Elettronica -Italy
URP
TECHNICALAND MAINTENANCE MANUAL

URP Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)Pag. 2
URP
Portable FM Exciter 87.5-
108 MHz Range
TechnicalandMaintenanceManual

URP Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)Pag. 3
INDEX
Preliminary Instructions and Warranty InformationsPag.5
Safety RegulationsPag. 7
CHAPTER 1
General DescriptionPag. 9
Electrical Specifications (Table A)Pag.10
Dimensional & Environmental Specifications (Table B)Pag.12
CHAPTER 2
Electrical DescriptionPag.13
Front Panel View DescriptionPag.15
Front Panel View (Fig. 1)Pag.16
Rear Panel View DescriptionPag.17
Rear Panel View (Fig. 2)Pag.18
CHAPTER 3
Installation ProcedurePag.19
Main Voltage Connections (Fig. 3)Pag.21
Audio Input Connections (Fig. 4)Pag.22
APPENDIXA
Circuit Diagrams, Layouts and Bill of MaterialsPag.23
Card Connections DiagramPag.24
Front Panel CardPag.25
Synthesis CardPag.29
R.F. Amplifier CardPag.34
VCO/AFCardPag.39

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PRELIMINARY INSTRUCTIONS
AND WARRANTY INFORMATION
WARNING: This equipment is a"CLASS A" equipment. In aresidential 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 ageneral guide for those having previous
knowledge and experience with this kind of equipment. It is not intended
to contain acomplete 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

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Warranty shall come into force from invoice date and for the period
of the manufactures warranty.
The warranty for aperiod 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 off 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 aregular 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 awritten technical report where mention all the
problems found and acopy 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
Telephone [phone]
Fax [phone]
R.V.R. reserves the right to modify the design and specifications of the
equipment in this manual without previous notice.

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WARNING!
The currents and voltages in this equipment are dangerous!
Personnel must at all times observe safety regulation!
This manual is intended as ageneral 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 acomplete 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

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TreatmentofelectricalShock
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
AAIRWAYBBREATHING
IF UNCONSCIOUS,IF NOT BREATHING,
OPEN AIRWAYBEGIN 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.
CCIRCULATION
CHECK CAROTID PULSEDEPRESS STERNUM 11/2" TO 2"
IF PULSE ABSENT,APPROX. 80 SEC. : ONE RESCUER, 15 COMPRESSIONS,
BEGIN ARTIFICIAL2 QUICK BREATHS.
CIRCULATION APPROX. 60 SEC. :TWO RESCUERS, 5 COMPRESSIONS,
1BREATH
NOTE: DONOTINTERRUPT RHYTHMOF COMPRESSIONS
WHEN SECONDPERSON IS GIVING BREATH.
Call for medicalassistanceassoonaspossible.
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).

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FIRST-AID
Personnelengagedintheinstallation,operation,maintenanceor
servicingofthisequipmentareurgedtobecomefamiliarwithfirst-aid
theoryandpractices.Thefollowinginformationisnotintendedtobe
acompletefirst-aidprocedure,itisbriefandisonlytobeusedas
areference.Itisthedutyofallpersonnelusingtheequipmenttobe
preparedtogiveadequateEmergencyFirstAidandtherebyprevent
avoidablelossoflife.
TreatmentofelectricalBurns
1) Extensive burned and broken skin.
a. Cover area with clean sheet or cloth.
(Cleanest 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 aweak 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 4ounces (half aglass) over aperiod
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.

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CHAPTER1
GENERAL DESCRIPTION
1.1 INTRODUCTION
The R.V.R. model URP are very compact externally powered FM exciters
which may be used as an economic alternative to alow power exciter or
as a portable unit.
1.2 ELECTRICAL DESCRIPTION
The URP is capable of either 10 watts or 2watts with the power output
being controlled by a switch on the front panel.
The URP/2 model is capable of 2 watts only.
Both units operate from an external power supply which must be regulated
to ensure stability of the operating frequency.
The supply voltage may be in the range of 12 VDC to 13.8 VDC.
Power output will very somewhat with the applied supply voltage.
1.3 SPECIFIACATIONS
Please refer to Table A for the elctrical specifications and
Table B for the mechanical specifications.

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TABLEA
ELECTRICAL SPECIFICATIONS
DC Power Requirements12-13.8V, 2.2A
(approx) at 10Wor 1.7A
(approx) at 2.5W
Frequency Rangefrom87.5 to 108MHz
(other in request)
Frequency Rangedirect from frontpanelin
100KHzincrements-shift 50KHz
Frequency Stabilitybetterthan±500Hz
Max Power Output10W ±10% dependent on and
portionate tosupplied DC
Volatge (12-13.8V allowed)
R.F. OutputConnectorS0239 (PL)type
Output Impedance50 Ohm
AudioInputs2Total,5KOhmimpedance,
unbalanced,balanced.
1StandardstereomaleXLR
whichcan be used eitherfor
composite/wideband operation
or monaural operation
(switchable).
1Standard mono maleXLR
fordirect microphone usewith
built-in micropre-ampand
limiter.
InputLevelforStereoVersion2Vrms for 100%modulation
Input Level for Mono Version25mV rms for 100% modulation

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Stereo Separation40dB or better
Amplitude Response±0.5dBorbetter,
30Hz to100KHz
Pre-emphasisfor FCC 75 microsec
for CCIR 50 microsec
S/N Ratio>70dB below±75KHzdeviation
at 400Hzmeasured in a30Hz to
100KHz bandwidthwith75µsec
SpuriousHarmonicSuppressionmeetsorexceedsall FCCand
CCIR requirements
Modulation Capabilitymeetsorexceedsall FCCand
CCIRrequirements (the
followingAMnoiseparameters
aredeterminatedprimarlyby
theDC powersourceused)
Asyncronous AM S/NRatio70dBbelowreferencecarrier
with 100% amplitude modulation
at 400Hz, without de-emphasis,
no FM modulation present
Asyncronous AM S/NRatio60dBbelowreferencecarrier
with 100% amplitude modulation
at 400Hz, without de-emphasis,
FMmodulation=±75KHzat400Hz
THD, IMD, TIM0.25% or better

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TABLEB
DIMENSIONAL ANDENVIROMENTAL SPECIFICATIONS
Chassis Dimensions143mm (5.7") W
71mm (2.8") H
310mm (12.4") D
AmbientOperatingTemperaurefrom-10°Cto +45°C
Humidity90% maximum, non-condensind
Weight2 Kg(4.5 Lbs)

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CHAPTER2
ELECTRICAL DESCRIPTION
2.1 FRONT PANEL BOARD
The front panel board contains all of the controls, switches and
indicators necessary to operate the unit.
Toggle switches control DC power (9 Fig.1), RF power (3 Fig.1),
Stereo /Mono selection (1 Fig.1), Line/Mike selection (2 Fig.1), and
Power/Deviation selection.
The four digi-switches (5 Fig.1) control the frequency of the unit in
100KHz steps.
2.2 SYNTHESIZER BOARD
The Synthesizer board contains the phase lock loop circuits required
to maintain the unit on frequency. IC1 is the reference frequency
oscillator and divider.
The crystal oscillator oscillates at 6.4MHz and is divided down to
781.25Hz which is the reference input frequency to IC2 phase detector.
The VCO frequency of 88 to 108MHz comes in to the board at CN7 to IC4
where it is divided by 128.
The VCO signal then goes to T2 and IC5. IC5 divides by anumber determined
by the front panel digi-switches. The output of this divider is 781.25Hz
when the units is locked to the reference frequency.
When the unit is out of lock the phase detector generates an error signal
which if filtered by IC3B and used to steer the VCO to the proper
frequency.
IC3A generates the Mute signal which shuts down the RF output when the
unit is unlocked, and lights the unlock light (12 Fig.1) on the front
panel.
2.3 VCO/AUDIO BOARD
The VCO/Audio board generates an RF signal at the output frequency
which is locked to a stable crystal reference as shown in 2.2.
The VCO is T4 and its associated circuits. The coil L1 is made up of coaxial
cable to prevent microphonics in the output signal due to vibration of
the oscillator components.
Diodes D2 and D4 are varicap diodes used to control the frequency of the
VCO.
ADC control voltage from the synthesizer is used to control this point.
Diodes D1 and D3 are used to modulate the VCO with the desired audio signal
from the audio processing circuits.
T6 and T7 make up aset of gate controlled amplifiers. T9 controls the
on/off condition the amplifier by application of the unlock control
signal from the synthesizer.
The Audio section process the input audio signal for application to the

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VCO.
IC8B amplifies the input signal. Jumper JP2 is used when the user desired
single ended input.
With JP2 out of the circuit, the input is balanced. The output of IC8B
is sent to IC8A. With capacitors C63 and C64 in the circuit, pre-emphasis
is applied.
The insertion of these capacitors is controlled by the stereo/mono switch
on the front panel. The output of IC8A is used to modulate the unit in
the line selection.
In the microphone selection the signal from IC8B is further amplified
in IC9B and IC9A. IC10A and IC10B are used to rectify the audio signal
and process it for a deviation meter reading.
2.4 POWER AMPLIFIER BOARD
The power amplifier board receives the RF signal from the VCO board
at a level of 1.5 to 2 watts.
In the URP this signal is amplified by Q1 to ten watt level with the
high/low switch (4 Fig.1) on the front panel shorting out the collector/
emitter junction of Q2. When the high/low switch is open, transistor Q2
lower the voltage to Q1 and thus lowers the output power.
The amaplified signal is then sent through alow pass filter to remove
the harmonic content, then sent to the VSWR circuit where the power is
sampled for the front panel meter reading.
Only the direct power is measured on the front panel.

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FRONT PANEL
VIEW DESCRIPTION (Fig. 1)
1MONO/STEREOMono/Stereo switch
2LINE/MIKEInputtype Swtitch:lineormike
3DEV/PWRThemeasurementmade bythemeter
corresponds to theposition ofthis
selector(DeviationorPower
Output)
4HIGH/LOWLevelPower Output :
High=10W
Low=2W
5FREQUENCYRotaryfrequency selector
6+50Ledindicatingthe+50KHzshift
insertion
7AUDIOINPUTAudioInputconnector
(XLR male connnector)
8DEVADJDeviationAdjustementtrimmer
9ONPowerOn switch
10ONPowerOnled
11PWR/DEVAnalogmeter usedtomonitorthe
parameters of the exciter such as:
DEVIATION
POWEROUTPUT
12UNLOCKIndicated thattheVCOis notlocked
tothereferencefrequency.The
power will drop to zero in this
condition
13
R.F. OUTPUT CONNECTOR
R.F. Output Connector

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FRONT PANEL (FIG.1)

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REAR PANEL
VIEW DESCRIPTION (Fig. 2)
1PWRADJTrimmertoregulate thepower output
ofthe exciter
2DC POWER INPUTDC powerinput connector
3FUSEFuseblock.
Fuse=4Afor the10Wversion
Fuse=3.15Aforthe2Wversion

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REAR PANEL (FIG.2)

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CHAPTER3
INSTALLATION PROCEDURE
3.1 INTRODUCTION
This chapter contains the information required to install the URP
and carry out preliminary checks.
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 and rear panel controls are operational.
3.1 INSTALLATION
To install the URP exciter, carry out the following procedure:
1)Connect a suitable dummy load (50 ohm) to the antenna connector
(13 Fig.1) or connect to the intended antenna (50 ohm).
The unit should be connected to the proper load to ensure that is
does not generate unwanted spurs or get damage deu to high VSWR
caused by antenna or load mismatch.
Antenna VSWR should be 1.5:1 or better.
2)Set the desired operaring frequency on the front panel
digi-switches.
An additional 50KHz may be set with jumper JP1 on the synthesizer
board.
3)Connect the audio line to the front panel.
The unit will accept either aline input of 0dBm or a microphone
input of approx 20mV rms.
The desired input in selected with the Line/Mic switch (2 Fir.1)
on the front panel.
This input will accept signals up to 100KHz. The user has the option
of using either mono or amultiplex signal from stereo generator.
The URP unit do not contain an internal streo generator.
4)Connect 12 to 13.8 volts DC to the rear panel.
CAUTION : Observe the polarity of DC volatge.
Plus goes ti the red terminal and minus goes to he black terminal.
The URP units contain areverse current diode to protect the unit
against power reversal.
The purpose of this diode is to blow the fuse in the event of DC
input reversal.
The fuse is 4A for the 10W version and 3.15A for the 2W version.
The size of the wire should be sufficient to prevent volatge drop

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on the wires or heating of the wires.
The power supply itself should be tightly regulated. The unit may
also be powered from asuitable 12 volt battery or abattery charged
by a solar panel.
For the mains voltage connections see as reference Fig.3
In each case the power source must be stable to prevent unlocking
of the VCO or modulation of the signal by unstable power source.
5)Place the DEV/PWR switch (3 Fig.1) on the front panel to the power
position.
Turn the power on to the unit. Observe that the power light (10 Fig.1)
comes on and the unlock light (12 Fig.1) will go out and the power
meter (11 Fig.1) will register power output.
The unit is designed to shut down the power if the phase lock loop
is in the unlocked condition.
6)Place the DEV/PWR switch (3 Fig.1) in the DEV position and apply
the modulation.
Check to ensure that the unit is not overmodulating.
Modulation level may be adjusted with the DEV ADJ control (8 Fig.1)
on the front panel.
Use a small screwdriver blade to adjust the level.
7)For the audio input connections see as reference Fig.4