5314027926

831E Series FM Trunsmilters

The Collins 831E series includes two high-performance transmitters the831E-l and the 831E-1B. These two units have a power output of 5 kW and 7.5 kW respectively. Physically, they are identical except for power supply com-ponents. The Collins 310Z solid State exciter is used to supply the rf signal to the transmitter. At that point, it is amplif ied by a 4CX250B driver and a neutralized 4CX5000A tetrode operating in Class C. Because of the method of neutralization. tuning and output adjustments are simple and straightforward. To promote long tubę life, the lila-ment voltage is automatically controlled to within 2% of optimum value. Output is also controlled automatically by a servo system that maintains it within 2% of autho-rized level.

Ali interlocks, Controls and indicators are operated by a 28-Vdc system, eliminating problems with remote control interfacing, and providing additional safety for the operator.

FM Noise Level........ 65 dB below 100% modulation

(±75 k Hz)

AM Noise Level........ -55dBrms

Ałtitude............ Operating 7500 ft at 30°C

Nonoperating 10,000 ft

Power Source......... 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

Permissible Linę Voltage

Variation........... ±5%. In addition. each phase volt-

age shall be within 5% of the ave^ge of all three phases.

Power Requirements..... Nominał 5 kW output requires 14

kVA at 0.97 power factor; nominał 7.5 kW output requires 17.5 kVA at 0.97 power factor

Size.............. 68-15/16" (175.1 cm) H; 71-1/2"

(181.6 cm) W. 27-1/2" (698 cm)

D.

Weight............. 2300 Ibs (1025 kg)

831 E-1........... FM Transmitter, 5 kW

831 E-1 B.......... FM Transmitter. 7.5 kW

Filament and piąte Controls are located on the front panel, with a built-in 120-second delay in the piąte Circuit to provide for tubę warmup. Overload sensors in both the driver and finał amplifier monitor the transmitter's opera-tion, and fault indicators pinpoint trouble areas, easing maintenance efforts. If a fault occurs. an automatic recycle system will attempt to re start the transmitter either two or four times in a 30-second period, as set by the siation engineer.

As in all other Collins FM transmitters, the 831 E-1 and

831E-IB feature vertical component placement, and remov-

able panels for ease of maintenance. Also, when necessary,

the control panel may be removed and located up to 50 ft 831E Caeity

from the transmitter, solving installation problems and pro-

viding operation according to FCC regulations.

r-r

83IF Series specificalions

I I I !■

Output Power.........

Output Impedance ......

Frequency Rangę.......

Frequency Stability......

Modulation Capability . . . .

Audio Input Leveł ......

Audio Frequency Response . .

Audio Freguency Distortion. .

Stereo Separation.......

Harmonie Attenuation . . . .

831 E-1: 5 kW

831 E-1 B: 75 kW

50 ohms, vswr 2:1 maximum

88 to 108 MHz

±1000 Hz

±100 kHz

10dBm r2dB

Complies with FCC standard pre-emphasis curve

Monaural: 1% IN PTR will mea surę like 831G-1 (0.5% or less typical) 50 to 15,000 Hz

35 dB minimum, 50 to 15.000 Hz (39 dB typical)

80 dB minimum

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831E FM Transmitter

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