PT EUROPE AM TRANSMITTER
AM TRANSMITTER
The equipment of the DSW-N series has a robust, modular, easy-to-maintain modular design, designed to operate in any environment, from mountain range to sea. It includes components of easy acquisition and great part of its circuits are removable, even without needing to remove the station off-air. The DSW-N series has advanced PWM Interphase Polyphasic technology, you can add AMC carrier dynamic control has been incorporated, allows to reduce up to 30% of total electrical energy consumption. The carrier frequency has a stability better than 1 hz, this is thanks to the implementation of a digital oscillator of the "DDS" (Direct Digital Synthesizer) digital synthesizer of the latest technology, which is associated with a processor that allows to modify the frequency of the carrier +/- 10khz in order to measure the width of the radiant system band without the need of an external frequency meter. Our modulated RF amplifier, PA2K5N supply 2.500watts Carrier power. It is composed by nine H bridges, which in turn are switched by nine other high power HEXFET type mosfet. The output of the nine modulated RF amplifiers is combined in the same module by a wilkinson-series combiner, with which we get a correct distribution of the impedance and currents of each RF Power Amplifier H-bridge, with an efficiency> 96%. Our PA working at 1.666 watts of Carrier power in the different models, approximately 40% less than its maximum capacity. The dsw series to uses mixture of wilkinson more L/C phase shifters RF final combiner which has incomparable advantages compared the equipment with serial RF final combiner, example:
a) It provides good isolation between modules without the necessity of imbalance resistor. It is therefore more cost effective and more efficient than balanced hybrids with dissipative resistive loads. It also provides initial low-pass filter of the harmonic rich square wave PA output.
b) The power module failure mode can be either low or high impedance and cannot cause any damage to the combiner.
c) It can be extended to combiner two or more groups of modules to create higher power level transmitters.
* Automatic start after the electrical reset, memorizes the last power level in which the equipment is located. (Fold-back).
* Surge protector and VRD's in the main source.
* Double exciter stage with automatic change.
* Output Power level schedule.
* Telemetry and control via text message SMS, LAN / IP.
* Decrease of power before increase of VSWR, does not leave off-air, sending alert by SMS/Email.
* Removable forced ventilation system, facilitates maintenance. (> / 3kw)
* Removable modulated RF amplifiers in operation. Plug type (> / 3kw)
* Four levels of power all independent.
* Folding auxiliary source control unit.
* Pre-amplifier of broadband RF, 300Khz to 2Mhz.
* System of measurements and alarms of micro processed
DSW-N Series
