The Continental Electronics Type
419G/420C Transmitters are versatile, state-of-the-art, high
efficiency 300 kW / 500 kW shortwave transmitters capable of
being operated in standard amplitude modulation, controlled
carrier-level modulation or single side band service. The 419G
and 420C are essentially the same transmitter with the principal
differences being in the type of final output tube, rating of
some vacuum capacitors, power rating of the high voltage transformers,
and input power switch gear.
From a central master control panel or from a remote computer
control and monitoring station, either of these transmitters
may be set up and either pretuned or automatically tuned to
deliver full carrier power at any frequency between 3.90 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 419G/420C Transmitters described
herein employ some of the most technologically advanced components
available today. From the highly efficient modulator using the
latest insulated-gate bi-polar transistors, to the final power
amplifier that uses the most modern tetrodes, components and
circuitry have been selected to provide optimum performance
and reliability.
Both transmitters include all required switch gear, power supplies,
protective circuits, amplifiers, controls, as well as 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 capable of providing high quality broadcast service
with minimum maintenance and down time.
Typical Installation
Features
High efficiency tetrode RF power amplifier using tubes available
from several sources.
High efficiency Solid State Modulator using insulated-gate bi-polar
transistors.
Overall transmitter efficiency in excess of 73% under all conditions
of RF frequency and modulation depth.
Full remote control and monitoring capability via RS-232 or
RS-422 data link.
RF output frequency range of 3.95 to 26.1 MHz.
Controlled Carrier-level Modulation (CCM) for reduced power
consumption.
Built-in capability for optional single side band (SSB) operation.
Exceptional audio signal quality.
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