inovonics
631
631 Professional FM Relay Receiver
Overview
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.
The extremely sensitive and selective front end of the AARON 640 digitally decodes the entire Analog baseband. Outputs are low-latency MPX, Balanced Analog and AES-Digital signals for retransmission.
The back panel provides a 50 Ohm (N) antenna connector, a true (off air) composite outputs, Balanced Analog and AES-Digital audio, and remote IP access. Rear-panel and self-logging alarms constantly check for Audio Loss, RF Loss, and RDS Loss (or ‘hijacking’). Online notifications can alert personnel with e-mail or instant text messages when any of the alarms occur. The front panel displays left and right audio metering, local LED alarms and an LCD screen with jog wheel for advanced control and editing of all tuning and monitoring parameters.
AARON 640’s “responsive” web interface allows complete setup, listening, logging and control of the unit from your PC, tablet or smartphone, and reliable 2-way connectivity is ensured with a built-in Dynamic DNS utility. Advanced off-air metering tools include an FM BandScanner and FFT of the MPX region. Reception bandwidth, auto-blending and many other receiver parameters are controlled via manual or automatic reception processing.
Features
- Easy to set-up and use
- Selectable wide/narrow IF bandwidth
- Composite/MPX and balanced L/R stereo outputs
- LCD Display
- Menu-driven selection of functions and readouts
- High-resolution bargraph displays indicate:
- MPX and audio levels
- Total carrier modulation
- Left/Right audio levels
- Incoming RF
- Multipath distortion
- Digitally-tuned
- Carrier-loss and audio-loss alarms
Specifications
TUNING RANGE
87.5 –108.1MHz in 100kHz steps.
ANTENNA INPUT
75-ohm, ‘F’ connector (50-ohm option with ‘N’ connector available).
RECEIVER SENSITIVITY
RECEIVER SELECTIVITY
DISTORTION (in MPX or L/R audio)
STEREO SEPARATION
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
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
