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Lectrosonics SRb5P Dual Channel Slot-Mount Wireless ENG Receiver

Abel Code: LEC-SRB5P
Mfr. Code: SRB5P
Estimated to Ship – 5-10 Business Days
Ideal for cameras with (1) audio output. This SRb5P Wireless Receiver features an additional audio output on front and audio outputs on the rear of the Receiver. Uses state-of-the-art filters, RF amplifiers, mixers, and detector to capture encoded signal.
Key Highlights
  • 2 lightweight receivers in 1 box
  • Removable antennas
  • 256 selectable UHF frequencies


The SRb Series are two-channel, slot-mount Digital Hybrid Wireless® diversity receivers. The SR receiver offers two independent channels and fits into the standard video camera slots found on professional cameras. The (2) audio channels can feed separate inputs or can be mixed internally to feed a single input. Digital Hybrid Wireless® technology provides superb, compandor-free audio quality and compatibility with other wireless systems. The RF performance is extremely stable over a very wide temperature range, making the receiver perfectly suited to the rough environmental conditions found in field production. Encodes digital audio into analog format that you transmit over an analog FM wireless link.

The SRb5P variant, this Lectrosonics SRb5P Dual Channel Slot-Mount Wireless ENG Receiver, is equipped with an external audio output for cameras with only one audio input in the slot. Both audio channels can be connected with optional external cable (MCSR/SPXLR2). The unit is powered from an external 6 to 18 volt DC source.

A DSP compatibility mode allows the receiver to be used with a variety of Lectrosonics and other brands of wireless systems and with Lectrosonics IFB transmitters.


  • Camera slot and stand-alone adapters
  • SmartSquelch for noiseless muting
  • 256 selectable UHF frequencies
  • Dual channel SmartDiversity reception
  • Single Channel Ratio Diversity reception
  • Automatic Power State Restoration
  • DSP-based pilot tone squelch
  • Rear Panel and Front Panel audio outputs
  • Supports HH Transmitter talkback feature

Digital Hybrid Wireless

Digital Hybrid Wireless (US Patent 7,225,135) 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 at to 20 kHz. 

Front Control Panel

The front panel features a menu-driven LCD interface and (4) membrane switches, that 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 displays a histogram of RF activity within the tuning range. Areas of little or no RF activity are easily recognizable.

Controls & Indicators include:

  • Sealed panel with membrane switches
  • LCD monitors pilot tone
  • Antenna phase
  • Receiver battery level
  • Transmitter battery status
  • Audio level
  • RF level

The (2) 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.

When Ratio Diversity is enabled, both receivers are combined to pick up the same transmitter. This means the Main Window will display a single audio channel.

Once again, the 5P version of the SRb receiver is intended for use with cameras that do not have both audio channels enabled in the camera slot. In addition to the audio out- puts on the rear panel, a second set of outputs are also provided through a 5-pin connector on an adapter next to the control panel.

Connectivity & Mounting

A variety of optional 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. 

Smart Noise Reduction (SmartNR)

The wide dynamic range of digital hybrid technology with a at response to 20 kHz makes it possible to hear the -120 dBV noise oor 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 with- out sacri cing audio high frequency response.

The Smart Noise Reduction algorithm works by attenuating only those portions of the audio signal that t a statis- tical pro le for randomness or electronic hiss. Because it is much more than a sophisticated variable low pass filter, the transparency of the audio signal is preserved. Desired high frequency signals having some coherence are not affected, such as speech sibilance and tones.

The Smart Noise Reduction algorithm has three modes, selectable from a user setup screen. The optimal setting for each application is subjective and selected while simply listening to the audio.

IF Amplifiers & SAW Filters

The first IF stage at 244 MHz employs two state-of-the- art SAW (surface acoustic wave) filters which significantly increases the depth of filtering while preserving sharp skirts, constant group delay, and wide bandwidth. Though expensive, this special type of lter allows primary filtering as early as possible, at as high a frequency as possible, before high gain is applied, to deliver maximum image rejection. Since these filters are made of quartz, they are very temperature stable.

After the SAW filter, the 244 MHz IF signal is converted to 350 kHz in receiver 1 and 250 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, it offers outstanding AM rejection over a very wide range of signal strengths and produces an excellent noise improvement at low signal strengths.

Digital Pulse Counting Detector

The SRb Series receivers use an elegantly simple, yet highly effective digital pulse counting 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.

DSP-Based Pilot Tone

The system uses a DSP generated ultrasonic pilot tone to control the receiver audio muting at turn on and turn off, with brief delays applied to eliminate thumps, pops or other transients that can occur. The pilot tone frequency is different for each of the 256 frequencies in the tuning range of a system (frequency block). This eliminates squelch problems in multichannel systems where a pilot tone signal can appear in the wrong receiver via intermodulation products. The DSP generated pilot tone also eliminates fragile crystals, allowing the receiver to survive shocks and mishandling much better than older crystal-based pilot tone systems.

Smart Squelch

After the pilot tone opens the audio output, several techniques are used to remove distracting noise without the squelching action itself becoming a distraction. One of these techniques involves waiting for a word or syllable to complete 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 SR can deliver acceptable audio quality from otherwise unusable signals.

Supersonic Noise-Based Dynamic Filter & Squelch Control

In addition to SmartNR, all hybrid receivers are equipped with a supersonic noise-based dynamic lter 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 lter 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.

There is no better way to track the signal-to-noise ratio than to measure it directly, and this noise-based system requires no calibration.

Talkback Function

The Talkback function works with your HH handheld transmitter to use one of the output channels for communication with staff and crew. One of the audio outputs is connected to the mixer, recorder or house feed. The other output is connected to a "com" channel.

When the talkback button on the transmitter is pressed, the audio output on the receiver is switched to the opposite output jack. When the button is released, the audio output toggles back to the original output jack.

Auto 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.

Camera Compatibility from Manufacturer


All current Ikegami camcorders with Uni-Slot receiver mounts are dual-channel capable in the slot with a simple switch activation on the UI board, including models:

  • HDS-V10
  • HDN-X10
  • DNS-33W


Cameras currently shipping with the two-channel* audio operation within the receiver slot (Unislot) with the SR/SRa Receivers. If you have an older version of these cameras. Be sure to update your camera to the latest Panasonic firmware.

  • AG-HPX300
  • AJ-HPX2000
  • AJ-HPX2100
  • AJ-HPX2700
  • AJ-HPX3000
  • AJ-HPX3700

*NOTE: SRb, SRb5P, SR, SRa, SR5P and SRa5P Receivers all operate in Diversity Mode in either single or dual-channel modes.



NOTE: Not all camera have (2) audio channels enabled in the slot. 

What's in the Box

  • Limited 1-Year Warranty
  • Quickstart Guide
  • 2 x Antennas (part #AMJXX)
  • Adjustment Tool (part #35679)
  • Lectrosonics SRb5P Dual Channel Slot-Mount Receiver Wireless ENG Receiver


Key Highlights

  • 2 lightweight receivers in 1 box
  • Removable antennas
  • 256 selectable UHF frequencies
  • Feed separate audio or combine signal
  • SmartSquelch for noiseless muting


Input Voltage:
6-18V - 1.4 W
Power Input:


Receiver Options:
Dual Conversion - (superheterodyne)
Wireless Frequency:
486.400 to 511.900 MHz - Frequency adjustment range: 25.5 MHz (in 100 kHz steps)
External Antenna(s) - Antenna Inputs: 50 ohms (SMA female connectors)
Quieting: >100 dB (typical)


2.8 in
0.8 in
5.1 in
2 lb
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