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The Collins 310Z FM Exciter features the newest concepts in FM broadcast exciter design. This exciter, completely solid State, provides a frequency-modulated 88- to 108-MHz signal suitable for further amplification.

Monaural, stereophonic, and SCA audio inputs are provided to facilitate any type of operation. The 310Z is designed to match a 50S2 load, and accepts input frequencies up to 75 kHz. Plug-in Circuit card construction makes the exciter compact and easily maintained. The Circuit cards may be extended from the transmitter front panel for test and maintenance.

Output power may be adjusted manually at the unit, or automatically from a remote location. Accessibility and maintainability are greatly improved through total modular construction, and all circuitry and adequate test points are accessible from the front of the exciter.

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786V-1 Stereo Generator

For stereo, or SCA operation, the optional 786V-1 Stereo Generator or 786W-1 SCA Generator cards may be em-ployed. Collins uses the direct FM method of modulation, superior to any other method in use.

786W-1 SCA Generator

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31 OZ Błock Diagram

During monaural operation, audio isapplied directly to the baseband amplifier. The 14-MHz oscillator is modulated with the signal from the baseband amplifier. The result of this is a 14-MHz signal with a ±75-kHz peak deviation about the center frequency. The output of this oscillator is then mixed with another crystal-controlled oscillator that operates on a frequency that is 14 MHz below the station frequency. The resulting sum frequency is then amplified in in a three-stage amplifier and provided as an output.

310Z FM Exciter

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