CONTINENTAL ELECTRONICS 416 C

GENERAL DESCRIPTION


Type 416C 10 kW HF AM Broadcast Transmitter

photo Continental Electronics 416 C Designed for operation in the International short wave broadcast band, the Type 416C utilizes Continental's field-proven screen modulation system which makes possible an excellent degree of performance. Transmitter is manually tuned over the frequency range from 3 to 22 megacycles. Excitation is provided by either a crystal oscillator or a variable frequency oscillator. The Type 416C is housed in frameless aluminium cabinets which provide excellent shielding, light weight and easy access to all components.

ADDITIONAL CAPABILITIES
The Type 416C can be adapted to provide pre-set channeling and automatic tuning. It can also be provided as a communications transmitter with the following power capabilities: 20 kw for CW or FSK emission; 30 kw peak envelope power for SSB. By removing one P.A. tube, the Type 416C becomes the Type 415C, and has a power output of 5 kw.

R.F. CIRCUITS
Any appropriate crystal oscillator or variable frequency oscillator having an output of 0.2 watt into a 75-ohm line, can be used to excite the Type 416C. The exciter amplifier unit is followed by the tuned driver and power amplifier circuitry. Modulation and carrier level regulation are accomplished at the screen grids of the final amplifier tubes, using a direct-coupled cathode-follower circuit. Over-all RF feedback is sampled from the output of the transmitter, rectified and applied to the first audio stage to reduce noise and improve linearity.

POWER AMPLIFIER
Two 4CX10,000D tubes are operated in parallel to provide the 10 kw power output. Grid circuit is driven through a Pi network from a single 4CX300A. Output circuit of the Power Amplifier consists of a Pi network and a harmonic filter.

SCREEN GRID MODULATION
Screen grid modulation offers the following features and advantages: problems of power-line regulation and carrier shift are minimized, reduced modulator power requirements, use of small audio components, no audio output transformers, low distortion, and continuous 100% modulation over audio spectrum.

POWER SUPPLIES
All power supplies utilize solid state rectifiers, eliminating warm-up time and improving transmitter operation in areas of temperature extremes.

COOLING
Transmitter is air cooled, with air intake from the rear.

TECHNICAL SPECIFICATIONS
Audio Input Impedance 150/600 ohms
Audio Input Level (100% modulation) +10 ±2 dbm
Audio Frequency Response
(95% modulation)
50-7500 cps
30-10,000 cps

±1 db
±1.5 db
Audio Distortion (95% modulation) 50-10,000 cps 3%
Noise (Below 100% modulation) -60 db
Carrier Shift (95% modulation) less than 2%
Type of Modulation high-level screen grid
Frequency Range 3-22 mc
Type of Emission A3
Type of Output unbalanced coaxial
Output Impedance 50 ohms
Output Capability 10,600 watts
Maximum Ambient Operating Temperature +45° C
Power Source Required:
Voltage
Frequency
208/230 volts, 3 phase
50-60 cps
Power Consumption 30 kw (approx.)
Power Factor 90%
Permissible Combined Voltage Variation and Regulation ±5%
Mechanical:
Height
Width
Depth
Floor Space
Weight (unpacked)
Building Entrance Requirements
78 inches
72 inches
41 inches
18 sq. ft.
2300 lbs.
36 inches wide by 41 inches high
Specifications may change without notice

TUBE COMPLEMENT
RF stages AF stages and modulator
Number Type Number Type
2 4CX10,000D

1 4CX300A



THIS TYPE OF TRANSMITTER IS INSTALLED IN THE FOLLOWING COUNTRIES

ITU Country
ITU Country