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LIMITERS ANI) AMPLIFIERS

COLLINS 26U-3 PEAK LIMITING AMPLIFIER

The basie purpose of the 26U-3 is to ensure that peak signals are attenuated sufficiently to prevent over-modulation at the transmitter output. Some "soft" means of accomplishing this is desirable to keep distortion due to clipping to a minimum, and yet keep the overall signal level as high as possible. This has been accomplished by utilizing optimum attack and release times of the age signal.

In the limiting amplifier, symmetrical or unsymmetrical clipping is controlled "behind-the-panel" to prevent inadvertent adjustment. Manuał Controls engage preemphasis and deemphasis networks for FM transmitter installations. The 26U-3 provides a truły balanced 600-ohm input and will provide either 600- or 150-ohm operation.

Frequency Response: 50 Hz to 15 kHz Total Distortion: Less than 1% at maximum output and all compression levels

Automatic Gain Control Rangę: 10 db dynamie rangę, minimum

Compression Ratio: 10:1 minimum Normal Input/Output Levels: 10dbm Maximum Output Level: 20 dbm Attack Time: 2 microseconds Release Time: 150 milliseconds Input Impedance: Fully balanced, 600 ohms Output Impedance Dual floating 150-ohm secondaries for any 600- or 150-ohm connection Size: 5-1/4" 03.3 cm)H; 19" 48.5 cm)W; 15-3/4" (40 cm)D.

Weight: 15 Ibs (6.8 kg)

26U-3    758 5778 001 Peak Limiting Amplifier automatic gain control rangę than comparable models. It can be operated in pairs to achieve stereo broadcasting.

This compression amplifier incorporates the latest solid-state techniques, including maximum use of linear integrated circuits for inereased reliability and lower power dissipation. A balanced H-pad network with 600-ohm inpedance provides a truły balanced 600-ohm load for operation from a balanced or unbalanced source.

Frequency Response: 50 Hz to 15 kHz, fiat within 1 dB Total Distortion: Less than 1% at maximum output and all compression levels

Automatic Gain Control Rangę: 30 db dynamie rangę, minimum

Compression Ratio: 15:1 minimum Normal Input/Output Level: 10 db Maximum Output Level: 20 db Attack Time: 5 milliseconds Release Time: 9 seconds Input Impedance: Fully balanced, 600 ohms Output Impedance: Dual floating 150-ohm secondaries for any 600 or 150-ohm connection.

Automatic Gain Control Threshold: 20 db below normal input

Gain Below Threshold: Automatically returns to nominał gain after extended signal pause Size: 5-1/4" (13.3 cm)H; 19" (48.5 cm)W; 15-3/4" (40 cm)D.

Weight: 15 Ibs (6.8 kg)

26J-3    758 5776 001 Auto-Leve! Compression Limiter

Collins 26U-3 Peak Limiting Amplifier

Collins 26J-3 Auto-Level Compression Amplifier

With the 26J-3 Compression Amplifier, a broadcaster is afforded automatic level control of program materiał. This compact unit, which provides either 600- or 150-ohm operation in either AM or FM installations, has 10 db morę

Collins 26J-3 Auto LeveI Compression Amplifier

CBS FM Limiting Amplifiers

This family of units provide$ the FM broadcaster with an effectiveness means to prevent overmodulation caused by pre-emphasized signals, prevent SCA crosstalk, achieve higher modulation levels without distortion, and maintain automatic level control. The Model 4100 automatic peak controller processes Iow, middle. and high frequencie$ independently; overall instantaneous limiting assures no overmodulation will occur. Frequency response is fiat ± 1 dB below the limiting threshold; harmonie distortion is less than 1%; attack time is less than 1 microsecond (depending on wave form); and recovery time varies between 200

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