SMK 1000 Selektive Multicoupler

The simultaneous operation of several HF transmitting lines in close co-location is a major task, for example on board naval platforms or in embassy buildings.
In conventional system design, every single radio link requires its individual antenna, usually implemented by a tuned whip antenna. This frequently results in serious interference effects between the communication lines causing  unacceptable signal distortions and restricts the operation of the HF communication equipment.

The most promising approach to overcoming such restrictions is the use of broadband antennas fed by more than one transmitting line simultaneously.
This requires combining the power of several transmitters upstream of the  antenna feeding point.

Through its product family Selective Multicoupler SMK 1000 TELEFUNKEN  RACOMS offers a novel approach. Using the principle of »Directional Filter« the power of several transmitters is transferred simultaneously to the antenna with lowest combining losses.

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  • The Selective Multicoupler is of a consequently modular design
  • Application specific configurations are built from 7 basic modules
  • The number of Directional Filters forming a chain is limited by the total power rating not to exceed 5 kW
  • The transmitter power at selective inputs of Directional Filters  may be up to 1 kW (up to 5 transmitters of the 1 kW class may feed one antenna)
  • Transmitters of different power rating (e.g. 1 kW and 400 W) may be operated simultaneously
  • Selective Multicouplers of a smaller configuration may be expanded later on by adding Directional Filters 
    (the rack should be prepared accordingly)
  • System Control Unit handles modified configurations of the Selective Multicoupler by just declaring  the additional equipment in the initialization file 


    The Selective Multicoupler SMK 1000 for Short Wave Communication  is a naval and unique approach to

    • Simplify the design of the HF antenna system
    • Support the reduction of ship signatures by the use of “conformal“ antenna systems
    • Improve communication reliability with highly efficient power combining, reduction of unwanted emissions and high isolation between transmitting lines
    • Adopt the upcoming HF communication standards like STANAG 5066