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60100 - VOX Shelves
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60100 - VOX Shelves

The Raven VOX Shelves provide a way of interconnecting various types of mobile radio equipment at the voice level without losing the first few syllables. The VOX/Delay Module is the component that digitally delays the audio while the transmitter is keying up to prevent speech clipping.

The 60100-400 VOX Shelf is configured to accommodate up to four 61649 VOX Modules, each module is capable of two VOX circuits, for a total capacity of up to eight independent VOX circuits. Push-to-talk (PTT) relay outputs, COR inputs and audio delay are provided on each VOX circuit.

The 37600-410 VOX Shelf is configured to accommodate up to ten 37649 or 37649-01 VOX Modules, each module is capable of two or four VOX circuits, for a total capacity of up to 20 or 40 independent VOX circuits. Push-to-talk (PTT) relay outputs, COR inputs and audio delay are provided on each VOX circuits.

The VOX Shelves are capable of operating with redundant power supplies, where both power supply assemblies are turned on. If either power supply fails, the other supply will continue to supply power through diode logic. Redundant supplies are optional; if a single supply is specified, the diodes are not used.

Raven has recently introduced the M4 Communication System , 47600 Series, which has more capabilities than the VOX Shelves discussed above. M4 can be equipped with as many lines as your application requires. A few more of the advantages to M4 are tone sequencing, tone remote control, as well as many other communication capabilities.

The Raven VOX Module provides the detection and delaying of voice frequencies (o.2 to 3.4 KHz). When voice frequencies above the threshold level are detected, a relay contact closure is provided. The VOX Module uses CMOS and microcomputer technology to digitally convert, detect, delay, and reconstruct analog signals. Switches are provided to set the amount of time delay (up to 1 second) and to set the analog detect level. The input can provide gain and the output amplifier provides gain or attenuation.

LEDs are provided to give a visual indication of which channels are active. Additional circuitry is provided to allow for a COR (carrier operated relay) input. Each COR input can be individually programmed as active high or active low. The VOX Module can use this signal to provide additional input (TTL) to determine how the keying relay operates.

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