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| Exhibition held in Dubai in CABSAT Mena family of 2-20KW transmitter was introduced to the sector ... |
 2-20KW transmitter family was introduced to the sector at CABSAT Mena Exhibition held in Dubai on 3-5 March 2009.
This High Power FM Transmitter project supported by European Union was started in early 2008 and has been introduced the Radio TV broadcasting sector firstly.
OM30 model 30W Digital Exciter developed in this project has AES/EBU input, remote control which can be control of all parameters by PC and 90 dB S/N. Front Panel has a knob which can change all parameters and can be viewed by LCD Panel. Many renowned manufacturers assessment the OM30 which will meet the needs of the industry's during the world move to digital broadcasting in this period.
OFA2K model Amplifier developed in this project has 4 pc’s 500W Pallet Amplifier which uses latest generation LDMOS transistors. Forward and reflected powers, Voltage and Current values and in/out temperature values of each amplifier can be viewed from LCD Panel of OFA2K.
Each 500W Pallet Amplifier of OFA2K has separate power supply and in case of malfunction Transmitter will run at lower power. Protection circuit of device works as foldback logic. This means if reflected power increase output power will decrease automatically for safe working of Transmitter.
Similarly, if the temperature exceeds 70 degrees, transmitter power passes automatically to the safe working range is reduced. A special cooling system is designed for the transistor. Due to using more powerful transistors, a special cooling techniques and devices used in the 7 / 24 security operation has been achieved. The transmitters up to 20 kW are manufactured by combining OFA2K 2 kW Amplifiers. Combining are done by “Wilkinson Coupler”. Each Transmitter has Control Module. This module operates cooling fans of terminating resistors if power decreases or any failure occurs. If the temperature of terminating resistors exceeds 70 degrees, this module cuts off power of Exciter and switch off the Transmitter. Control Module also cut off the output power at increasing reflection, decrease or increase of supply voltage. Operator is informed by GSM messages if these cases occur and operator can reset and operate the Transmitter by sending GSM message or via Internet.
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