What's in the Box
- (1) x Lectrosonics SRc Dual-Channel Receiver with SuperSlot
- (1) x Lectrosonics 35679 Adjustment Tool
- (2) x Lectrosonics AMJXX Antennas
- (1) x Quickstart Guide
What's in the Box
Due to manufacturer's restrictions this item cannot be shipped outside of the United States.
The SRc design includes two separate receivers built into a single, ultra compact housing with adapters for video camera receiver slots and for standalone use. 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.
DSP compatibility modes allow the receiver to be used with a variety of Lectrosonics systems, other brands of wireless 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 displays a histogram of RF activity across the band. Areas with 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. The receivers are powered from an external 7 to 18 volt DC source. The SRC5P model provides a 5-pin connector next to the control panel with audio output from both channels in addition to the camera slot outputs.
The Lectrosonics SRb Camera Slot UHF Receiver is a two-channel slot-mount Digital Hybrid Wireless diversity receiver that supports 640.000 - 665.500 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.
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.
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.
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.
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.
This particular wireless microphone device operates in portions of the 617-652 MHz or 663-698 MHz frequencies. Beginning in 2017, these frequencies are being transitioned by the Federal Communications Commission (FCC) to the 600 MHz service to meet increasing demand for wireless broadband services. Users of this device must cease operating on these frequencies no later than July 13, 2020. In addition, users of this device may be required to cease operations earlier than that date if their operations could cause harmful interference to a 600 MHz service licensee’s wireless operations on these frequencies. For more information, visit the FCC’s wireless microphone website at www.fcc.gov/wireless-microphones-guide or call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC).