The Vimesa PS-2 is a 2 kW FM transmitter with a modular design for reliability. It uses 250 watt power amplifier modules in a redundant configuration, with individual amplifiers that can be removed for service without shutting down the transmitter. The transmitter has a microprocessor control system and can be monitored remotely.

1. VIMESA PS-2
ADVANCED BROADCASTING FM TECHNOLOGY
RELIABILITY, RESILIENCE, SIMPLICITY, ECONOMY

2. VIMESA PS-2
BROADBAND FM TRANSMITTER.
MODULAR DESIGN:
VIMESA XPT-50 EXCITER (50 W)
TWO MODULES POWER SUPPLY.
2 x 1 KW POWER DRAWER SERVICEABLE WHILE WORKING.
4 x 250 W POWER AMPLIFIER PER 1 KW POWER DRAWER.
2 KW COMBINER MODULE.
MICRO PROCESSED CONTROL.
4 x 40 CHARACTERS DISPLAY.
• No need to neither adjust nor tune.
• Double power supply easy to service.
• Double exciter configuration without external switching unit.
• “Fold back“ protection against reflected power excess.
• Micro-processed control. The Central Control Unit manages and monitors continuously the
transmitter parameters.
• 2 x 1 kW Power Drawer..
• 4 x 250 W power amplifiers per 1 kW Power Drawer. Individual power amplifiers could be
removed while the power drawer continuous working.
• The 250 W power amplifiers are independent, interchangeable and can be easily removed from
power drawer using a screwdriver, without a soldering iron.
• All PS family transmitters uses the same 250 W Power amplifier.
• Optional GSM/GPRS remote control.
In order to get the maximum reliability and resilience a modular design with optimal redundancy
has been applied.
Main building blocks are 250 W power amplifiers and combiner modules.
The automatic power control circuits stabilized output power against power supply or power
exciting variations.
“Fold back” protection circuits protects against reflected power excess.
VIMESA PS2 SHORT GUIDE PAGE 2

3. POWER AMPLIFIER SPECIFICATIONS
Mechanical specifications
Height ............................................. 1511,7 mm. (30 RU 19”)
Width...................................................................... 580 mm.
Depth ..................................................................... 800 mm.
Weight.......................................................................180 Kg.
Environmental characteristics
Operating temperature.................................................0 a 50ºC
Maximum relative humidity . . .........................................95 %
Maximum operating altitude .to. ..................................3000 m.
Electrical specifications
Power Supply........................... .220 Vac ± 10%. 50-60 Hz. single phase
Max. consumption................................... 4.000 VA for 2 KW. Power output
RF Output Power ....................................................500-2000 W. adjustable
Frequency range............................................................ 87,5 - 108 MHz
Output impedance ................................................................... 50 ohms
Output Connector ............................................................. 7/16” female
Exciting power ................................................... 20 / 50 W. (model dep.)
Input connector ....................................................................... N female
Spurious radiations ............................................<-1 mW (tipical -75 dB)
AM Modulation.......................................................................... <-50 dB
Audio measurements...........................................Transparent respect
............................................................................................ modulator
VIMESA PS2 SHORT GUIDE PAGE 3

4. POWER SUPPLY:
TWO IDENTICAL MAIN POWER SUPPLIES ARE SINGLE
PHASE CONVENTIONAL SUPPLIES, WITH A CAPACITY OF
DELIVERING 40 A. CURRENT FOR A +48V VOLTAGE.
EACH OF THESE SUPPLIES FEEDS A 1 KW. AMPLIFIER
MODULE..
ALL ITS COMPONENTS ARE WIDELY OVER DIMENSIONED.
EACH OF THEM IS BASICALLY MADE UP OF A MAIN
TRANSFORMER, A FULL WAVE RECTIFIER AND A C - L - C
FILTER, WHICH GUARANTEES THE SPECIFIED LEVEL OF
AM NOISE
THE VIMESA XPT 50 EXCITER IS USED .
DOUBLE EXCITER CONFIGURATION CAN BE MADE
WITHOUT EXTERNAL SWITCHING UNIT
THE EXCITER OUTPUT IS
DIVIDED BY TWO SAME
POWER SIGNAL, AND
DISTRIBUTED BETWEEN THE
TWO 1 KW INPUT DRAWERS
THE DIVIDER IS A RF POWER SPLITTER NETWORK
BUILT IN MICROSTRIP TECHNOLOGY, THAT SPLITS
THE EXCITER’S OUTPUT POWER BETWEEN THE TWO 1
KW. POWER DRAWERS WITHOUT CAUSING ANY PHASE
OR AMPLITUDE ALTERATION.
VIMESA PS2 SHORT GUIDE PAGE 4

5. 1 KW POWER DRAWER GENERAL VIEW
FROM LEFT TO RIGHT: 4 POWER SUPPLY, POWER OUTPUT CONTROL
CIRCUITS, 4 OUTPUT SPLITTER, 4 x 250 W POWER AMPLIFIERS, 4 FILTERS,
4 x 250 W INPUTS COMBINER AND 1 KW OUTPUT.
SPLITTER 4 x 250 W FILTERS 1 KW COMBINER
CONTROL
CIRCUITS AMPLIFIERS
AUTOMATIC POWER
CONTROL CIRCUITS AND
REFLECTED FOLDBACK PER
EACH 250 W AMPLIFIER
VIMESA PS2 SHORT GUIDE PAGE 5

6. TWO OUTPUTS SPLITTER NEXT TO 1 KW POWER
A S
1 KW POWER DRAWER
4 OUTPUT SPLITTER MICROSTRIP WILKINSON
4 x 250 W AMPLIFIERS MOUNTED ON COOPER
PALLET.
USES RF MOSFET-T POWER TRANSISTOR ABLE TO
DELIVERY MORE THAN 25O W OUTPUT POWER.
DIRECT FORWARD AND REFLECTED POWER
CONTROL CIRCUITS ARE BUILT.
TEMPERATURE SENSOR CLOSE TO TRANSISTOR
MONITOR ITS TEMPERATURE
7th A LOW-PASS FILTER
REDUCES THE LEVEL OF
HARMONICS.
THERE IS ONE FILTER PER
EACH 250 W POWER AMPLIFIER.
4 INPUTS LOW-LOSS MICROSTRIP
WILKINSON COMBINER, WHICH
INCORPORATES ITS OWN BALANCING
RESISTANCES
IN CASE OF BREAKDOWN OF ANY OF THE
250W POWER AMPLIFIER. ALLOWS THE
REMAINING AMPLIFIERS TO CONTINUE
WORKING CORRECTLY FOR AN INDEFINITE
PERIOD OF TIME
VIMESA PS2 SHORT GUIDE PAGE 6

7. 1 KW POWER DRAWERS
OUTPUT
THE 2 KW COMBINER IS LOCATED ABOVE THE 1
KW POWER DRAWERS
IT IS A WILKINSON COUPLER THAT RECOMBINE
EACH ONE OF THE POWERS DELIVERED BY THE
TWO 1 KW POWER DRAWERS IN ORDER TO
DELIVER AN OUTPUT POWER OF 2.000W
2 KW COMBINER INPUTS
2 KW OUTPUT GOES THROUGH A DIRECTIONAL
COUPLER BEFORE REACHING THE OUTPUT
CONNECTOR.
IN THE DIRECTIONAL COUPLER, RF DIODES
PROVIDES CONTINUOUS VOLTAGE INDICATIONS
OF FORWARD AND REFLECTED POWER TO THE
CONTROL UNIT AND OTHER MEASUREMENT
EQUIPMENT
VIMESA PS2 SHORT GUIDE PAGE 7

8. RF POWER OUTPUT IS MADE BY MEANS OF ONE
7/16” CONNECTOR AT THE CEILING OF 19” RU
FRAME.
REFRIGERATION IS FORCED BY MEANS OF A
EXTRACTOR FAN AT THE CEILING AND 5 BLOWERS
WORKING CONTINUOUSLY.
THE NECESSARY FLOW OF FRESH AIR IS
CHANNELLED THROUGH THE HEATSINK OUTLETS
INSIDE EACH 1 KW POWER DRAWER,
THE FOUR 250 W POWER AMPLIFIERS
ARE FIXED BY 4 SCREWS ON A BIG
HEATSINK.
2 BLOWERS BEHIND 1 KW POWER
DRAWERS; ASSURE THE NECESSARY
FLOW OF FRESH AIR THROUGH THE
HEATSINK OUTLETS.
THE CENTRAL CONTROL UNIT IS IN CHARGE OF:
• EXECUTION OF LOCAL OR REMOTE CONTROL ORDERS
• AUTOMATISM EXECUTIONS
• PROTECTION OF THE TRANSMITTER
• MANAGEMENT OF SERIAL CONTROL BUS
• SYNCHRONOUS COMMUNICATIONS PORT
IT ALSO DEALS WITH EXTERNAL INTERFACE CIRCUITS,:
INHIBITION CIRCUITS, REMOTE AND CONTROL
MONITORING,
VIMESA PS2 SHORT GUIDE PAGE 8

9. THE 1 KW POWER DRAWER CAN BE PULLED OUT FOR
MAINTENANCE WITHOUT TAKING OFF AIR THE POWER DRAWER.
POWER DRAWERS ARE ACCESSIBLE FROM THE FRONT OF FRAME.
ARE MOUNTED OVER GUIDES TO MAKE EASY THE EXTRACTING
AND INSERT.
ALL THE WIRING IS THROUGH CORD PLUGS, WHICH MAKE
CHECKING, REPLACEMENT, CLEANING OR REPAIR MUCH FASTER
AND EASIER.
ONCE PULLED OUT THE 1 KW POWER DRAWER, THE 250 W POWER
AMPLIFIER PALLETS CAN BE REMOVED EASILY USING A
SCREWDRIVER (WITHOUT THE SOLDERING IRON) AND USING A
SCREWDRIVER) WHILE THE REST OF 250 W POWER AMPLIFIER ARE
WORKING.
VIMESA PS2 SHORT GUIDE PAGE 9

10. DOUBLE EXCITER CONFIGURATION WITHOUT EXTERNAL
SWITCHING UNIT.
THANKS TO THE USE OF TWO VIMESA XPT 50 EXCITERS
WITH AUTOMATIC SWITCH OVER OPTION, THERE IS NOT
NEED TO USE AN EXTERNAL SWITCHOVER UNIT.
AS THE VIMESA XPT 50 PROVIDES 50 W POWER OUTPUT,
THERE IS NOT NEED TO USE EXTERNAL EXCITERS..
THEREFORE, THE PS 2 WITH DOUBLE EXCITER PROVIDES AN
OPTIMAL REDUNDANCY.
.
VIMESA PS2 SHORT GUIDE PAGE 10

11. VIMESA PS TRANSMITTERS FAMILY
PS 1 PS 2 PS 3 PS 5 PS 10
1 kW 2 kW 3 KW 5 KW 10 KW
VIMESA (VIDEO MEDIOS S.A.)
C/ BATALLA DEL BRUNETE, 48
POLÍGONO INDUSTRIAL CODEIN
More information: 28946 FUENLABRADA
MADRID –SPAIN-
Tel.: +34 91 606 8870
e-mail: vimesa@vimesa.es
www.vimesa.es
VIMESA PS2 SHORT GUIDE PAGE 11