Mechanical Description
The CCA AM50,000F requires only 51 Square Feet of floor space and is housed in three medium-size cabinets. The AM50,000F utilizes reliable vacuum tubes and is state-of-the-art implementation of proven technology. The AM50,000F is air-cooled and access to all components is through rear interlocked and front-hinged doors. Additional access is provided through interlocked panels. Every part and component can be seen by simply opening the appropriate door or panel. Interlocked doors and panels protect personnel from access to all circuitry with exposed terminals operating at 300 volts or greater. Fast-acting bleeder circuitry and automatic shorting of high-voltage power supplies protect personnel from excessive voltages.
Full-size meters display all necessary operating and maintenance parameters. Meters are prominently displayed along the top of all cabinets. Additional status lights indicate operation of control and overload circuitry.
Automatic recycling of the transmitter overload circuits is provided to allow continuous operation if a fault condition is temporary. The overload indicator will remain lit to advise engineering personnel that an overload occurred and to indicate which circuit was at fault. A re-set switch is provided to restore normal status of all indicators.
The AM50,000F is cooled by high-volume, high-pressure blowers. Separate blowers for each modulator and the power amplifier are provided within their respective cabinets. Cabinet exhaust fans are also provided with filtered air-intake. All cooling greatly exceeds tube manufacturer recommendations assuring long tube life and reliability. All transmitter components are self-contained within the three cabinets.

Electrical Description
RF circuitry begins with a stable crystal oscillator providing two independent switchable circuits. The oscillator output is buffered and amplified to drive the 4-1000A (for Medium Wave) or 5CXI500B (for Short Wave) Intermediate Power Amplifier (IPA). A single 4CX35000C tetrode Power Amplifier (PA) conservatively produces 55KW of carrier power at 125% modulation.
The AM 50,000F audio circuity begins with a solid-state driver amplified by 4CX15000A modulators in the classic push-pull configuration. The modulator output is coupled to the power amplifier through a conventional modulation transformer and reactor configuration. High-level plate-modulation provides superior audio quality, reliability and ease-of-maintenance.
Transmitter control is provided by front panel switches. Reliable and easily maintainable relay logic control is utilized throughout the AM50,000F. This circuitry is easily interfaced with most modern remote control systems and metering samples are provided as well. No modification of the transmitter is necessary for remote control interfacing.
All power supplies are solid-state providing reliable, stable and efficient operation. A maximum plate voltage of 10KV is required to achieve rated power output. All power supply components were chosen for long-life and their ability to reliably provide high voltage and currents necessary for operation.
The CCA AM50,000F tubes are operated so conservatively that it is realistic to anticipate over 35,000 hours of tube life!

Technical Specifications
Frequency Range: 3 to 17 MHz or 500 to 1600 KHz
Frequency Stability: +/-5 Hz
AF Input Impedance: 150/600 ohms
AF Input Level: +10 dbm +/-2 dbm (for 100% Modulation)
AF Response: 50-10,000 Hz @ 95% Modulation ±1.5 db
AF Distortion (90% Modulation): 3%, 50 - 7500 Hz
Noise Unweighted (below 100% Modulation): 55 db
Modulation: High Level
Type of Emission: A3
Type of Output (3-1/8" EIA): Unbalanced
Output Impedance (unbalanced): 50-300 ohms
Carrier Shift, 100% Modulation: 3% or less
RF Voltage (frequency monitor): 10V, RMS, 75 ohms
RF Voltage (modulation monitor): 10V, RMS, 75 ohms
Power Output Capability: 55KW
Power Supply (Specify) Line Voltage 380/460V, 3 Phase Line Frequency 50/60 Hz
Power Consumption: 0% Modulation 95KW Average Program 103KW 100% Modulation 140KW
Power Factor: 0.9
Voltage Variation and Regulation: +/-5%
Spurious Emission (2nd Harmonic & above): 80 db
Operating Ambient Temperature Range: 0 degrees C to 50 degrees C
Operating Relative Humidity: 100% Maximum
Operating Altitude (specify for higher): 8500 Ft. Max.
Storage Temperature -35 degrees to 60 degrees C

Mechanical Specifications
Single Cabinet Size (approx.): 48" x 50" x 86" (transmitter requires three cabinets)
Floor Space Required: 51 Sq. Ft.
Overall Weight (approx.): 9,500 lbs.
Shipping Weight (approx.): 10,000 lbs.
Shipping Mass-Ft.3 (approx.): 485
--Per Cabinet (approx.): 162

[FM TRANSMITTERS ] [ AM & SHORT WAVE TRANSMITTERS ] [ HIGH PERFORMANCE FM EXCITERS ] [ NEW PRODUCTS ] [ TV & RADIO SYSTEMS ] [ INTERNET PRODUCTS ] [ WORLD WIDE MIF ]