Lectrosonics SRb Camera Slot UHF Receiver (Block 470)

BH #LESRB470 • MFR #SRB-470
Lectrosonics SRb Camera Slot UHF Receiver (Block 470)
Key Features
  • 470.100 - 495.600 MHz
  • Dual Receiver Design
  • Dual Channel SmartDiversity Reception
  • Single Channel Ratio Diversity Reception
The Lectrosonics SRb Camera Slot UHF Receiver (Block 470) is a two-channel slot-mount Digital Hybrid Wireless diversity receiver that supports 470.100 - 495.600 MHz operating frequencies. The SRb receiver offers two independent channels and fits into the standard video camera slots found on professional cameras. The two audio channels can feed separate inputs or can be mixed internally to feed a single input. Plus, a DSP compatibility mode allows the SRb to be used with Lectrosonics IFB transmitters.
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Lectrosonics SRB Overview

  • 1Description
  • 2Digital Hybrid Wireless
  • 3RF Front-End & Mixer
  • 4Smart Noise Reduction (SmartNR)
  • 5SAW Filters
  • 6IF Amplifiers
  • 7Digital Pulse Counting Detector
  • 8Supersonic Noise-Based Dynamic Filter & Squelch
  • 9Smart Squelch
  • 10Talkback Function
  • 11Automatic Power State Restoration

The Lectrosonics SRb Camera Slot UHF Receiver (Block 470) is a two-channel slot-mount Digital Hybrid Wireless diversity receiver that supports 470.100 - 495.600 MHz operating frequencies. The SRb receiver offers two independent channels and fits into the standard video camera slots found on professional cameras. The two audio channels can feed separate inputs or can be mixed internally to feed a single input. Plus, a DSP compatibility mode allows the SRb to be used with Lectrosonics IFB transmitters.

The device's RF performance is extremely stable over a very wide temperature range, making the receiver well suited for the rough environmental conditions found in field production. 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.

Other features include SmartSquelch for noiseless muting and a built-in spectrum analyzer that scans across the tuning range of the receiver to locate RF signals in the vicinity and find clear operating frequencies. The two internal receivers can be operated separately, each using switching, antenna combining diversity, or in tandem with ratio diversity reception. Clear frequencies are easily found with the built-in RF spectrum scanner and graphical LCD. The audio outputs of the receivers can be mixed internally, or left separated for discrete recording tracks or external mixing.

Digital Hybrid Wireless

Digital Hybrid Wireless is a design that combines digital audio with an analog FM radio link to provide both high audio quality and 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.

RF Front-End & Mixer

Each antenna signal is first passed through a high quality SAW filter to reject high power RF signals above and below the operating frequency. A high current amplifier follows the SAW filters and passes the signal to an internal splitter so that both antenna signals are available to both receivers for SmartDiversity reception.

Smart Noise Reduction (SmartNR)

The wide dynamic range of digital hybrid technology with a flat response to 20 kHz makes it possible to hear the -120 dBV noise floor in the mic preamp, or the (usually) greater noise from the microphone itself. To put this in perspective, the noise generated by the recommended 4k bias resistor of many electret lavaliere mics is -119 dBV and the noise level of the microphone's electronics is even higher. In order to reduce this noise a Smart Noise Reduction algorithm is used to remove hiss without sacrificing audio high frequency response. The SmartNR algorithm preserves the transparency of the audio signal. Plus, desired high frequency signals are not affected. The SmartNR algorithm has three modes, selectable from a user setup screen. The optimal setting for each application is subjective and selected while simply listening.

SAW Filters

The first IF stage at 244 MHz employs two state-of-the-art SAW (surface acoustic wave) filters that increase depth of filtering while preserving sharp skirts, constant group delay and wide bandwidth. This type of filter allows early primary filtering at a high frequency, before high gain is applied, to deliver maximum image rejection. The filters are made of quartz as well, which makes them very temperature stable.

IF Amplifiers

After the SAW filter, the 244 MHz IF signal is converted to 250 kHz in receiver 1 and 350 kHz in receiver 2. Only then is the majority of the gain applied, just before the signal is converted to audio. Although these IF frequencies are unconventional in a wide deviation (±75 kHz) system, they offer outstanding AM rejection over a wide range of signal strengths and they support noise improvement at low signal strengths.

Digital Pulse Counting Detector

The SRb Series receivers use a simple, yet effective digital pulse detector to demodulate the FM signal rather than a conventional quadrature detector. This eliminates thermal drift, improves AM rejection and provides very low audio distortion.

Supersonic Noise-Based Dynamic Filter & Squelch

In addition to SmartNR, all hybrid receivers are equipped with a supersonic noise-based dynamic filter and squelch system. The incoming audio is monitored for energy above 22 kHz, pilot tone excepted. Excessive high frequency energy indicates that the received signal is too weak to achieve an acceptable signal-to-noise ratio. Under marginal conditions, a variable low pass filter is rolled in dynamically, masking the noise while preserving as much of the transmitted signal as possible. When the channel is too noisy even for the filter, the audio is squelched. Plus, unlike analog squelching, this noise-based system requires no calibration and there is no better way to track the signal-to-noise ratio than to measure it directly.

Smart Squelch

The SRb Series receivers are designed to remove distracting noise without the squelching action itself becoming a distraction. They use a technique that waits for a word or syllable to be completed before squelching. Another technique incorporates recent squelching history and recent signal strength, adjusting squelching behavior dynamically for the most serviceable result under variable conditions. Using these and other techniques, the receivers can deliver acceptable audio quality from otherwise unusable signals.

Talkback Function

The Talkback function provides a second audio channel separate from the main audio channel to allow the user to communicate with staff and crew. When the button on the housing is pressed, the audio output on the receiver is switched to a different output jack. When the button is released, the audio output returns to the main output jack on the receiver.

Automatic Power State Restoration

The firmware "remembers" whether it was turned on or off when power is disconnected and returns to that state when power is restored.

Lectrosonics SRB Specs

Operating Frequencies470.100 - 495.600 MHz
Frequency Adjustment Range25.5 MHz (in 100 kHz steps)
Channel Separation100 kHz
Receiver TypeDual conversion (superheterodyne)
IF FrequencyChannel 1: 248.450 MHz and 350.000 kHz
Channel 2: 243.950 MHz and 250.000 kHz
Frequency Stability±0.001%
Bandwidth26 MHz at -3 dB (front end bandwidth)
Sensitivity20 dB SINAD: 1.0 uV (-107 dBm) A weighted
60 dB Quieting: 2.2 uV (-100 dBm) A weighted
Squelch Quieting>100 dB (typical)
AM Rejection>60 dB (4 uV to 1 V)
Modulation Acceptance85 kHz
Image & Spurious Rejection85 dB
Third Order Intercept0 dBm
Diversity MethodSmartDiversity phased antenna combining or Ratio Diversity using both receivers for a single audio channel
FM DetectorDigital Pulse Counting Detector operating at 250 and 350 kHz
RF Spectrum AnalyzerCoarse and fine scanning modes for RF spectrum site survey
Antenna Inputs50 ohms (SMA female connectors)
Audio OutputsInterchangeable D connector adapters for camera slot interfaces
Dual TA3 male (mini XLR) balanced output adapter
Balanced output adapter with fixed cables
Front Panel Audio OutputFront panel TA5M with two balanced outputs
Audio Output LevelAdjustable -50 to +5 dBu in 1 dB steps (unbalanced output is 6 dB lower)
Audio Channel Crosstalk-80 dB or better
Front Panel Controls and IndicatorsSealed panel with membrane switches
LCD monitors pilot tone
Antenna phase
Receiver battery level
Transmitter battery status
Audio level
RF level
Audio Test Tone1 kHz (±5 dBu balanced output); 1% THD
Transmitter Battery Type Selection9V alkaline
9V lithium
AA alkaline
AA lithium
Phase InvertAudio output phase normal or inverted
SmartNR (Noise Reduction)Off, Normal and Full modes (Available in Digital Hybrid mode only)
Audio Performance (Overall System)Frequency Response: 32 Hz to 20 kHz (±1 dB)
THD (System): 0.3% typical in Digital Hybrid mode
THD (400 Series Mode): 0.2% typical
Signal-to-Noise Ratio: 95 dB or better (overall system, Digital Hybrid mode)
Input Dynamic Range: 95 dB (with full Tx limiting)
Rear Panel ControlsXLR audio output jack
External DC input
Battery compartment access
PowerDC 6 - 18V (1.4W)
Current Consumption90 mA at 18 VDC
120 mA at 12 VDC
195 mA at 7.2 VDC
210 mA at 6 VDC
Runtime with SRBATTSLED Adapter7.2V (2200 mA) "L" style battery will typically provide about 11 hours of operation
Battery Level IndicatorLCD display with "bottle" icon and timer readout
Operating Temperature-4 to 122°F (-20 to 50°C)
Dimensions2.7 x 0.7 x 3.5" (68 x 18 x 89 mm)
Weight6.9 oz (195 g) with SRaEXT adapter
Packaging Info
Package Weight0.95 lb
Box Dimensions (LxWxH)9.8 x 7.9 x 3"
See any errors on this page? Let us know



will this fit in sony pxw-320 slot?
Asked by: Ken D.
The slot on the Sony PXW-320 XDCAM is designed for their own wireless receiver which offers dimensions of 3.5 x 5.5 x 1.25 (88.9 x 139.7 x 31.75 mm).The Lectrosonics receiver is: (WxHxD) 2.7 x 0.7 x 3.5 (68 x 18 x 89 mm) http://bhpho.to/26fzK6N
Answered by: Mark S.
Date published: 2018-08-28


Does it comes with SREXT back plate or it must be bought separately?
Asked by: Joao C.
You will need to order it separately.
Answered by: Jim B.
Date published: 2018-08-28


Is there any optional mounting hardware required to use this wireless receiver on a Panasonic AG-HPX370?
Asked by: Anonymous
Not really. Just behind the end of the handle where it ends at the back of the camera you will see a little plate. Remove the screws and take the plate off. A slot for the receiver will be revealed. Just drop the receiver in the opening and use the plate screws to secure the receiver in place.
Answered by: John P.
Date published: 2018-08-28
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