250 kW Short-Wave Broadcast Transmitter SK 53 C3-2

BBC - Brown Boveri; Switzerland

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  • Year
  • 1981 ??
  • Category
  • Commercial Transmitter (TX not Transceiver)
  • Radiomuseum.org ID
  • 329045

 Technical Specifications

  • Number of Tubes
  • 4
  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Transmitter
  • Wave bands
  • Short Wave (SW only)
  • Power type and voltage
  • Alternating Current supply (AC) / 3-24 k Volt
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: 250 kW Short-Wave Broadcast Transmitter SK 53 C3-2 - BBC - Brown Boveri;
  • Shape
  • Rack
  • Notes

  • The 250 kW Short-Wave Broadcast Transmitter, Type SK 53 C3-2 is fully automatic tuning equipped with a class “B” Modulator.

    Main features:

    • transistorized preliminary RF and AF stages
    • Class B modulation
    • Only four tubes 
    • all rectifiers with solid state elements
    • automatic tuning
    • unlimited choice of frequency in automatic tuning mode in broadcast bands; on special request outside bands
    • frequency change time maximum 60 seconds for automatic version
    • sinusoidal and trapezoidal modulation
    • possibility of high-power SSB service using PSM
    • easy provision of DCC
    • protective and automatic sequence circuits ensure safety of the equipment
    • personnel security system fulfills IEC 215-1
    • very simple layout of RF circuits ensures easy accessibility to components through doors at front and rear
    • very high overall efficiency
    Abridged Specifications  
    Carrier power output 250 kW over full frequency range
    Frequency range 5.95-21.85 MHz
    Output impedance 50 Ω unbalanced/300 Ω balanced (with balun)
    Permissible standing-wave ratio (SWR) 1:2.0 at 50 ohm output/1:1.7 at 300 ohm output
    Carrier noise level below m = 100% f = 1000 Hz unweighted: -55 dB
    Carrier shift with sudden application or removal of 100% modulation the variation in the carrier voltage will not exceed 5%
    AF input level for m = 100% modulation across 600 Ω balanced input impedance: 0 dBm - 20 dBm. Recommended 18 dBm
    Required time for frequency change 60 s maximum 
  • Mentioned in
  • - - Manufacturers Literature
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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