R.V.R. Elettronica TEX20-NV User manual

Manufactured by R.V.R. Elettronica - Italy
TECHNICAL AND MAINTENANCE MANUAL
TEX20-NV

TEX20-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 2
TEX20-
NV 20W FM EXCITER 87.5-
108 MHz RANGE
Technical and Maintenance Manual

TEX20-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
CHAPTER 1
General Description Pag. 10
Technical Specifications (Table A) Pag. 12
Dimensional & Environmental Specifications (Table B) Pag. 15
CHAPTER 2
Electrical Description Pag. 16
"Europa" Version Front Panel Description Pag. 19
"Europa" Front Panel View (Fig.1A) Pag. 20
"USA" Version Front Panel Description Pag. 21
"USA" Version Front Panel View (Fig.1B) Pag. 22
"Europa" Version Rear Panel Description Pag. 23
"Europa" Version Rear Panel View (Fig.2A) Pag. 24
"USA" Version Rear Panel Description Pag. 25
"USA" Version Rear Panel View (Fig.2B) Pag. 27
"Europa" Version Top View Description Pag. 28
"Europa" Version Top View (Photo 1) Pag. 29
"USA" Version Top View Description Pag. 30
"USA" Version Top View (Photo 2) Pag. 31
Block Diagram (Fig.3) Pag. 32
Recommended Test Equipment (Table C) Pag. 33
CHAPTER 3
Installation Procedures Pag. 34
CHAPTER 4
Maintenance Pag. 40

TEX20-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 4
CHAPTER 5
Calibration Procedures Pag. 41
APPENDIX A
Circuit Diagrams, Layouts and Bill of Material Pag. 47
Wiring Diagram Pag. 48
Main Card Pag. 51
Power Supply Pag. 64
CON-PA Card Pag. 69
R.F. Power Amplifier Pag. 73
Frequency Selector Card (Mod. TSW-1) Pag. 78
Frequency Selector Card (Mod. TSW-3) Pag. 82
USA Audio Input Card Pag. 86
Euro Audio Input Card Pag. 90
Clipper Card Pag. 94
TCXO Card Pag. 98

TEX20-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 5
PRELIMINARY INSTRUCTIONS
AND WARRANTY INFORMATION
WARNING: This 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.

TEX20-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 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
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.

TEX20-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

TEX20-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 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).

TEX20-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.

TEX20-NV Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo) Pag. 10
CHAPTER 1
DESCRIPTION OF THE TEX20-
N.V.
1.1 GENERAL DESCRIPTION
The TEX20-N.V. is housed in a 2U, 19" rack-mounting container comprising
a number of interconnected modules mounted internally on the bottom of the
equipment, facilitating removal and substitution.
On the front panel there are: the power output control PWR ADJ, the PWR/DEV
selector to select the power or deviation measuring on the analog meter, the
switch on selector with its relative led and the analog meter for the measuring
of main operating parameters.
For EUROPA version there are two BNC connectors too, one for MONO input and
other for MPX input.
On the rear panel there are: the BNC connector for mains voltage input, the
R.F. TEST -30dB BNC connector, the INTERLOCK BNC connector to block R.F. power
output from external equipment, the R.F. Output N-type connector, and only
for USA version, a EXT. REF. 1KHz BNC connector and audio inputs BNC connectors.
1.2 ELECTRICAL DESCRIPTION
The TEX20-N.V. is an exciter working in the 87.5 to 108 MHz band,
programmable in steps of 10 KHz. Its power output is continuously adjustable
from 2 to 20W into a 50 Ohm load.
It also accepts three SCA signals through the connectors placed on the rear
panel (only for USA version).
The specification features low audio distortion and intermodulation figures
(typ. 0.05%) and a high signal-to-noise ratio (typ. -72 dB).
A voltage selector on the transformer primary allows a variety of supply
voltages to be used.
1.3 METERS AND INDICATORS
The operating parameters of the exciter can be monitored using the analog
multimeter (1 Fig.1A EUROPA ver. and 1 Fig.1B USA ver.) situated on the front
panel.
The parameter to be measured is selected by the selector
(10-11 Fig.1A and 3-5 Fig.1B).
The frequency control (8 Fig.1A and 6 Fig.1B) allows frequencies to be selected
in steps of 10 KHz.
Two red alarm leds indicate VCO unlock (12 Fig.1A and 7 Fig.1B) and the mains
voltage line presence (13 Fig.1A and 9 Fig.1B).
Three green leds indicate the presence of +12V, +15V and +20V (2 Fig.1A
and 1B) voltages which are used to power the various cards inside the exciter.
There are a trimmer (7 Fig.1A and 4 Fig.1B) too that allows to choose the level