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831 F-1 KM Transmitters

The Collins 831F-1 Transmitter provides the same Iow cost operation that the high power 831G series does through sound design concepts and state-of-the-art components and methods. The same modular construction and vertical component placement make routine maintenance proce-dures simple. As in the other lines that Collins offers, the 10-kW 831F-1 FM Transmitter utilizes the Collins 310Z solid State exciter for a sound that is as clean and distortion-free asa live performance.

Automatic power output control is a standard feature, as well as automatic filament voltage regulation to within 2%. Another automatic function is the overioad recycling and fault indicator system. In the event of a failure, whether it be internal or external, the automatic recycle function will attempt to put the transmitter back on the air, but after a predetermined number of tries. will cease to operate. thus protecting the transmitter system components.

The transmitter is completely assembled and tested on the customer's frequency and power level to assure rapid installation and worry-free operation over a long time span. For shipment, a few components are removed to assure shipment without damage. A complete set of test data is supplied. showing all the operating parameters of the specific transmitter received. Since the entire Collins transmitter linę is designed to exceed FCC minimums, futurę concern about obsolescence is minimized.

The 831F-1 has only two tubes, a 4CX250B driver, and a 4CX5000A power amplifier operating at Class C. Neutraliz-ing provides for stable operation, and ease of tuning. A completely solid State power supply assures long life and steady performance.

831 F-1 specifications

Output Power.........

Output Impedanca ......

Frequency Rangę .......

Frequency Stability......

Modulation Capability . . . .

Audio Input Level.......

Audio Frequency Response . .

Audio Frequency Distortion . .

Stereo Separation.......

Harmonie Attenuation . . . . FM Noise Level........

AM Noise Level........

Altitude ...........

Power Source.........

Permissible Linę Voltage Variation.......

Power Requirements . Size .........

Weight 831F-1

10 kW

50 ohms, vswr 2:1 maximum 88 to 108 MHz ±1000 Hz ±100 kHz 10dBm ±2dB

Complies with FCC standard pre-emohasis curve

Monaural: PTR is NMT 1.0%. (Typical) is 0.5% or less) 50 to 15,000 Hz

35 dB minimum, 50 to 15,000 Hz (39 dB typical)

-80 dB minimum

65 dB below 100% modulation (±75 kHz)

■55 dB rms

Operating 7500 ft at 30°C Nonoperating 10.000 ft 200 to 250 volts ac 50/60 Hz 3-phase. Available taps on trans-formers are for 200, 210, 220, 230, 240, and 250 volts

±5%. In addition, each phase volt-age shall be within 5% of the average of all three phases. Nominał 10 kW output requires 21 kVA at 037 power factor 65-15/16" (175.1 cm) H; 71-1/2" (181.6 cm) W; 27-1/2" (698 cm) D.

2300 Ibs (1025 kg).

FM Transmitter, 10 kW

831 F-1 FM Transmitter

831 F-1 Con troi Panel

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