How The World Communicates

419H/420D-DRM 300/500kW
Shortwave Broadcast Transmitters
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The Continental Electronics Type 419H/ 420D-DRM Transmitters are versatile, state-of-the-art, high-efficiency 300 kW / 500 kW DRM shortwave transmitters capable of being operated in standard amplitude modulation (AM), Controlled Carrier-level Modulation (CCM) or digital streaming in the DRM mode (when used with the optional DRM Encoder/ Exciter).  The 419H-DRM and 420D-DRM are essentially the same transmitter, the differences being the final output tube, vacuum capacitors, high voltage transformers, and input power switchgear.

From a central master control panel or from a remote computer, the 419H/ 420D-DRM Transmitters may be set up and either preset or automatically tuned to deliver full carrier power at any frequency between 3.9 and 26.1 MHz.  If desired, they may also be manually tuned using controls and indicators located on the central master control panel.

The Continental Electronics Type 419H/420D-DRM Transmitters employ some of the most technologically advanced components available today.  Both transmitters include all required switch gear, power supplies, protective circuits, amplifiers, controls, and cooling and peripheral equipment. They are compact in design yet easy to service and maintain. Particular care in the design has been given to operational reliability and efficiency, resulting in transmitters delivering high performance broadcast service with minimum maintenance and down time.


  • Selection of up to 280 preset frequency channels achieved within 30 seconds between any two frequencies

  • Standard Frequency Range 3.9 – 22.0 MHz with available option of 3.9 – 26.1 MHz

  • New Computer-Assisted Touch Screen Control System, as well as front panel button operation

  • TCP/IP Based Remote Control System allows unattended operation, with complete control from off-site with no modification

  • 71 – 73 % overall efficiency on average

  • DRM Operation with standard optional DRM Encoder/ Exciter, plus all AM/PM Modes

  • High-Efficiency Solid State Modulator and HV Power Supplies offer low-stored energy protection without crowbar

  • Exclusive CCM (Controlled-Carrier level Modulation) allows carrier reduction from 0-6 dB in 1 dB steps

  • Self-Contained Water System for Primary Loop Cooling to external heat exchanger or facility water

  • Dual Fan, Epoxy Coated, External Heat Exchanger with Coated Coils for Corrosion Resistance

  • High-Speed Arc Sensors In All Critical RF Component Areas

  • Both PA and Driver Tubes and Vacuum Capacitors available from alternate sources


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419H-DRM 300 kW
420D-DRM 500 kW
Shortwave Broadcast Transmitters