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ASC (Canada) Ltd.
310 Judson, Unit 8,
Toronto, Ontario, Canada
M8Z 5T6

Phone: 416-251-5409
Toll Free: 1-877-251-5140
Fax: 416-251-7438

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SRa/SRa5P 2 Channel Receiver

SRa5P version of 2 channel receiver shown with some of the available adaptors  
Camera Slot UHF Receiver

The SRa5P and SRa 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 extremely 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 SR to be used 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. A built-in spectrum analyzer scans across the tuning range of the receiver to locate RF signals in the vicinity 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.

Several different rear panel adapters are available to configure the receiver for popular camera slots and for stand-alone use. The rear panels are held in place by two screws and are easily changed. Camera slot adapter kits include top panel bezels with hardware for a secure fit into the camera body. On the SRa5P, 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.

NOTE: Not all cameras have two audio channels enabled in the slot.

Digital Hybrid Wireless® is a revolutionary new design that combines digital audio with an analog FM radio link to provide outstanding audio quality and the exemplary RF performance of the finest analog wireless systems. This overcomes channel noise in a dramatically new way, digitally encoding the audio in the transmitter and decoding it in the receiver, yet still sending the encoded information via an analog FM wireless link. This proprietary algorithm is not a digital implementation of an analog compandor. Instead, it is a technique which can be accomplished only in the digital domain. The process eliminates compandor artifacts, expanding the applications to include test and measurement of acoustic spaces and musical instruments.

Available Adaptors:

SRUNI - Adapter kit for Unislot® camera slots such as those provided on Ikegami® and Panasonic® cameras (note: not all cameras have two audio channels enabled in the slot - please check with the camera manufacturer). Includes bezel, hardware and rear panel DB25 connector wired for power and audio connections.

SRSNY - Adapter kit for Sony® camera slots (note: not all cameras have two audio channels enabled in the slot - please check with the camera manufacturer), includes bezel, hardware and rear panel DB15 connector wired for power and audio connections.

SREXT - For stand-alone use, this kit includes a rear panel with two TA3 male jacks for the balanced outputs and a power jack with a locking connector. Trim the power cable to the desired length.

SRHARNESS - Ideal for use in portable "bag systems". Two balanced output cables and the power cable are 6 feet long. Cut the cables to the desired length and terminate as needed.

SRBATTSLED - The receiver can be powered with an optional "battery sled" adapter that attaches to the outside of the housing. The adapter includes an integrated connector plate and accepts L and M type video camera rechargeable batteries. The adapter sled does not include charging circuitry. Batteries must be recharged with their respective chargers. The external power jack includes a switch that disconnects the battery when a plug is inserted.

Operating frequencies:
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

Frequency Adjustment Range: 25.5 MHz in 100kHz steps
Channel Seperation: 100 kHz
Receiver Type: Dual conversion, superheterodyne
IF Frequencies: Ch.1: 243.950 MHz and 250.000 kHz, Ch. 2: 248.450 MHz and 350.000 kHz
Frequency Stability: ±0.001 %
Front end bandwidth: 26 MHz @ -3 dB
Sensitivity: 20 dB Sinad: 2 uV (-101 dBm), A weighted, 60 dB Quieting: 4 uV (-95 dBm), A weighted (Single antenna measurement)
Squelch quieting: Greater than 100 dB typical
AM rejection: Greater than 60 dB, 4 uV to 1 Volt
Modulation acceptance: ±50 kHz Deviation
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: Two flexible steel removable whips
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 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
Front Panel Controls and Indicators: Sealed panel with membrane switches, LCD monitors pilot tone; antenna phase, receiver battery level; transmitter battery status; audio level, RF level
Transmitter battery level tracking: LCD display with "bottle" icon and timer readout
Audio test tone: 1 kHz, -50 dBu to +5 dBu output (bal); 1% THD
Transmitter battery type Selection: 9V alkaline, 9V lithium, AA alkaline, AA lithium, NiMH
Phase invert: Audio output phase normal or inverted
SmartNR (noise reduction): OFF, NORMAL, FULL modes (available in 400 Series mode only)
Frequency Response: 32 Hz to 20 kHz (± 1dB)
THD: 0.3% (system) typical in 400 mode
Signal to Noise Ratio (dB): 95 dB or better (overall system, 400 Series mode)
Total Harmonic Distortion: 0.2% typical (400 Series mode)
Input Dynamic Range: 95 dB (with full Tx limiting)
Rear Panel Connection Options: DB15 camera slot adapter/DB25 camera slot adapter/Dual TA3 (mini XLR) and external DC
Powering Options (external DC): Min. 6 V to max. 18 Volts DC; 1.4 W 80 mA at 18 VDC, 115 mA at 12 VDC, 180 mA at 7.2 VDC, 200 mA at 6 VDC
Operating temperature: -40° C to +75°C
LCD visible temperature range: -25° C to +75° C
Weight: 195 grams (7 ozs.) with SREXT adapter
Dimensions: 2.68" wide x .72" high x 3.52" deep (68 mm x 18 mm x 89 mm)
Specifications subject to change without notice.
Copyright © 2009 Audio Services Corporation (Canada) Limited. All rights reserved.