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631 Professional FM Relay Receiver

Inovonics' Model 631 is our second generation of frequency-agile, digitally tuned receivers for FM translator and other critical off-air reception applications. Featuring menu-driven access of display and function selections, the 631 provides a switchable IF bandwidth to help solve difficult adjacent-signal problems and readouts of signal strength and multipath distortion to aid antenna alignment. Selectable options and alarms may be remotely controlled or monitored, and high-resolution bargraph readouts give accurate indications of incoming RF and MPX/stereo audio levels.

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TUNING RANGE
87.5 –108.1MHz in 100kHz steps.

ANTENNA INPUT
75-ohm, ‘F’ connector (50-ohm option with ‘N’ connector available).

RECEIVER SENSITIVITY

MONO: 10μV for 60dB S/N
STEREO: 150μV for 60dB S/N.

RECEIVER SELECTIVITY

WIDE: –6dB at ±140kHz
NARROW: –6dB at ±80kHz

DISTORTION (in MPX or L/R audio)

WIDE: <0.2% THD
NARROW: <0.6% THD

STEREO SEPARATION

WIDE: typ. >40dB
NARROW: typ. >20dB

COMPOSITE/MPX OUTPUT
Unbalanced, 75-ohm BNC; adjustable between 2V p-p and 6V p-p at ±75kHz carrier deviation.

OVERDEVIATION LIMITER
An internal clipping circuit limits the MPX output to a maximum level equivalent to ±100kHz carrier deviation.

PROGRAM LINE OUTPUTS
Left/Right active-balanced XLR outputs deliver +4dBm at ±75kHz deviation.
Frequency response ±0.5dB, 20Hz–15kHz
de-emphasis set by internal jumpers to 75μs or 50μs.

LOW-SIGNAL MUTING
Composite/MPX and L/R audio muted when incoming RF falls below the user-programmed LOW-SIG level.

AUDIO LOSS ALARM
Responds to loss of either stereo channel; alarm delay is user-programmable between 5 seconds and 4 minutes.

FAULT INDICATORS
Front-panel LCD indication of low incoming RF or loss of program audio. Open-collector NPN transistor switches enable remote alarm indication via rear-panel terminal strip.

POWER REQUIREMENTS
105-130VAC and 210-260VAC; 50/60Hz; 20W.

SIZE AND SHIPPING WEIGHT
23” x 16” x 2” (2U); 8 lbs
584mm x 406mm x 51mm ; 3.6 kg