The SRb consists of two separate receivers built into a single, ultra compact housing with adapters for video camera receiver slots and for stand-alone use.
Digital Hybrid Wireless® technology provides superb, compandor-free audio quality and compatibility with other wireless systems. The RF performance is extreme- ly stable over a very wide temperature range, making the receiver perfectly suited to the rough environmental conditions found in field production.
A DSP compatibility mode allows the receiver to be used with a variety of Lectrosonics and other brands of wire- less systems and with Lectrosonics IFB transmitters.
The front panel features a menu-driven LCD interface and four membrane switches which are used to view and alter settings. The main LCD window displays the pilot tone indicator, diversity activity, RF level, audio level and transmitter battery status for both receivers. To find clear operating frequencies, a built-in spectrum analyzer scans across the tuning range of the receiver and dis- plays a histogram of RF activity within the tuning range. Areas of little or no RF activity are easily recognizable.
The two internal receivers can be operated separately, each using switching, antenna combining diversity, or in tandem with ratio diversity reception. The audio outputs of the receivers can be mixed internally, or left separated for discrete recording tracks or external mixing.
A variety of output adapters and mounting options are available for camera slot operation. On the SRb5P, a 5-pin connector next to the control panel provides audio output from both channels in addition to the camera slot outputs. The unit is powered from an external 6 to 18 volt DC source.
Digital Hybrid Wireless® is a revolutionary design that combines digital audio with an analog FM radio link to provide both outstanding audio quality and exemplary, noise-free RF performance.
Using a patented algorithm to encode 24-bit digital audio information in the transmitter into an analog format, the encoded signal is then transmitted over an analog FM wireless link.
At the receiver, the signal is then decoded to restore the original digital audio. This process eliminates compandor artifacts and produces an audio frequency response flat to 20 kHz.
Operating Frequencies (MHz):
Block 470: 470.100 - 495.600
Block 19: 486.400 - 511.900
Block 20: 512.000 - 537.500
Block 21: 537.600 - 563.100
Block 22: 563.200 - 588.700
Block 23: 588.800 - 607.900 and 614.100 - 614.300
Block 24: 614.400 - 639.900
Block 25: 640.000 - 665.500
Block 26: 665.600 - 691.100
Camera slot and stand-alone adapters
Dual receiver design for two channel or single channel ratio diversity operation
Frequency Adjustment Range: 25.5 MHz in 100kHz steps Channel Separation: 100 kHz Receiver Type: Dual conversion, superheterodyne
Ch. 1: 248.450 MHz and 350.000 kHz
Ch. 2: 243.950 MHz and 250.000 kHz
Frequency Stability: ±0.001 % Front end bandwidth: 26 MHz @ -3 dB
20 dB SINAD: 1.0 uV (-107 dBm), A weighted
60 dB Quieting: 2.2 uV (-100 dBm), A weighted
Squelch quieting: Greater than 100 dB typical AM rejection: Greater than 60 dB, 4 uV to 1 Volt Modulation acceptance: 85 kHz Image and spurious rejection: 85 dB Third order intercept: 0 dBm Diversity method: SmartDiversityTM phased antenna combining or Ratio Diversity using both receivers for a single audio channel FM Detector: Digital Pulse Counting Detector operating at 250 and 350 kHz RF spectrum analyzer: Coarse and fine scanning modes for RF spectrum site survey Antenna inputs: 50 Ohm; SMA female connectors Audio outputs connectors: Interchangeable D connector adapters, for camera slot interfaces, Dual TA3 male (mini XLR) balanced, output adapter, Balanced output adapter with fixed cables Front panel audio output: Front panel TA5M with two balanced outputs Audio output level: Adjustable -50 to +5 dBu in 1 dB steps; unbalanced output is 6 dB lower Audio channel crosstalk: -80 dB or better