50 kW Medium Wave Broadcast Transmitter MW-50

Harris Corporation; Melbourne, Florida

Data
Forum
Pictures
Collections

  • Year
  • 1976 ?
  • Category
  • Commercial Transmitter (TX not Transceiver)
  • Radiomuseum.org ID
  • 328901

 Technical Specifications

  • Number of Tubes
  • 5
  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Transmitter
  • Wave bands
  • Broadcast only (MW).
  • Power type and voltage
  • Alternating Current supply (AC) / 3 Phase 50 or 60 Hz, 380 V - 480 Volt
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: 50 kW Medium Wave Broadcast Transmitter MW-50 - Harris Corporation; Melbourne,
  • Shape
  • Rack
  • Dimensions (WHD)
  • 144 x 78 x 48 inch / 3658 x 1981 x 1219 mm
  • Notes

  • 50 kW Medium Wave Broadcast Transmitter

    Features:
     

    • High level plate modulated, using a Pulse Duration Modulator [PDM]
    • High overall efficiency... exceeds 60%
    • Minimum power consumption, only 87 kW at 30% modulation
    • Only five tubes, with three tube types
    • Only one power amplifier tube and one modulator tube
    • Quiet, air -cooled operation
    • Compact design
    • High level design with no modulation transformer or reactor
    • Power level is adjusted in low level PDM stage. No loading adjustment is required
    • Switches smoothly from high to low power with. Carrier on
    • Automatic return to operation after a power failure
    • Easily remote controlled

    Specifications:

    POWER OUTPUT:  50,000 watts (rated), 60,000 watts (capable).
    Convenient power reduction to 25,000 or 10,000 watts.
    RF FREQUENCY RANGE:  535 kHz to 1620 kHz.
    RF OUTPUT IMPEDANCE:  50 Ω, unbalanced.
    RF FREQUENCY STABILITY:  ± 5 Hz.
    RF HARMONICS: Exceeds FCC and CCIR specifications.
    CARRIER SHIFT:  Less than 2% at 100% modulation at 1,000 Hz.
    AUDIO FREQUENCY RESPONSE:  ± 1.5 dB from 20 to 10,000 Hz, referenced to 10 kHz at 95% mod.
    AUDIO FREQUENCY DISTORTION:   Less than 3% from 40 to 10,000 Hz, at 95% mod.
    NOISE:  (Unweighted) -60 dB or better below 100% modulation.
    AUDIO INPUT LEVEL:  10 dBm ± 2 dB for 100% modulation.
    AUDIO INPUT IMPEDANCE:  600/150 Ω, balanced or unbalanced.
    MODULATION LEVEL:  100% sinusoidal, continuous, 50 to 5,000 Hz.

    The unknown rectifier is a F-1099 damper diode but I can find no specs for it.

     

  • Net weight (2.2 lb = 1 kg)
  • 5000 lb (5000 lb 0 oz) / 2270 kg
  • Mentioned in
  • - - Manufacturers Literature (Harris Radio Transmitter & Accessories, Broadcast Products Division of Harris Corp. 1976)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum