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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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VR Field

VR Field Portable Six Channel Modular Receiver  
Portable Six Channel Modular Receiver

The wideband design provides the flexibility to deal with a congested RF spectrum in any field or studio environment by changing receiver modules. No tools are required to remove and install the modules.

The receiver is comprised of these components:

  • The master host assembly
  • Up to six receiver modules
  • Built-in antenna multicoupler with loop-thru output
  • LecNet2 software for setup and control
Flexibility is the core concept of the design. The receiver modules can be operated separately, each with switched diversity reception for a total of six audio channels, or operated in pairs for more robust frequency or ratio diversity reception with a total of 3 audio channels. Various combinations can also be used for particular applications, such as a pair with ratio diversity reception and the other four with switched diversity reception for a total of five audio channels. The receiver modules are easy to change with no tools required.

A high quality antenna multicoupler is included in the receiver to ensure ideal signal distribution and isolation between modules and to reduce overall size and complexity. The multicoupler is actually a 1-in/7-out splitter which provides six outputs for the receiver modules and an additional output as a "loop thru" for another Venue receiver. A single pair of broadband antennas can feed several receivers connected with coaxial cable over a wide range of frequencies. Phantom power for remote antenna amplifiers can be turned on and off with internal jumpers.

The front panel provides an easy-to-use LCD interface for setup, and provisions for quick monitoring to assist in troubleshooting. In normal operation, the LCD shows RF and audio levels, diversity status, pilot tone status (where applicable) and transmitter battery status (when available) for all six receivers at the same time. Individual screens for each receiver are also available to provide additional information and setup adjustments. A headphone jack and level control is provided for individual channel monitoring. The NP1-type battery compartment is just below the LCD.

The rear panel provides six balanced audio outputs on standard XLR connectors, 50 ohm BNC antenna inputs, 50 ohm BNC antenna outputs from the built in zero-gain multi-coupler, power jack with a locking connector, USB port and RS-232 serial port for the computer interface. The assembly is powered from an external source of 10 to 18 VDC for a wide variety of applications in stage, studio and mobile applications. The power cable can also be used with an external distribution module to power the receiver and other devices simultaneously.

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.

Operating frequencies (MHz) for receiver modules:
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

Passband for VR Field host asssembly: Wideband Low (470 - 691 MHz passband)
Digital latency: 1.5 mS (receiver only - hybrid mode), 3.0 mS (receiver and transmitter in hybrid mode), 3.0 mS (receiver only - analog compatibility mode). The 3.0 mS latency in analog compatibility mode time aligns the audio from analog and hybrid transmitters when they are used together in a Venue system.
Frequency selection: 256 frequencies in 100 kHz steps per 25.5 MHz frequency block
Channel Spacing: 100 kHz
Dual Block Range: Built in antenna mulitcoupler covers a two block range
Pilot tone: 25 to 32 kHz; 5kHz deviation; unique pilot tone frequency for each selected carrier frequency (Hybrid mode)
Deviation: ± 75 kHz (max) (Hybrid mode)
Receiver Type: Triple conversion superheterodyne
Frequency Stability: ±0.001 %
Front End Bandwidth: VR Master: 50 MHz @ -3 dB, VRS Module: 30 MHz @ -3 dB, VRT Module: 11 MHz @ -3 dB
Sensitivity (20 dB Sinad): 0.9 µV
AM Rejection: >60 dB, 2 µV to 1 Volt
Image and Spurious Rejection: 85 dB
Third Order Intercept: VRS:+0 dBm, VRT: +6 dBm
Diversity Methods: Switched, ratio and frequency
FM Detector: Digital pulse counting detector @ 300 kHz
Frequency Response: 32 Hz to 20 kHz (±1dB), overall system (400 Series mode)
THD: 0.2% (typical) (400 Series mode)
Input Dynamic Range: 125 dB (with full transmitter limiting)
Audio Output Level: -15 dBu to +8 dBu, in 1 dB increments
LCD: 122x32 graphical display
Power Requirements: 10 to 18 VDC; 17.2 W max. (1.72 A @ 10 VDC to 1.05 A @ 18 VDC) via external power supply or NP1-type 12V battery
Weight: 5.77 lbs. (2619 g) with 6 VRS receivers & clips
Dimensions: Height: 3.5" (8.89 cm), Width: 11.88" (30.18 cm), Depth: 8.25" (20.95 cm) (cover to end of BNC jacks, +1.5" for rear handle)
Specifications subject to change without notice.
Copyright © 2009 Audio Services Corporation (Canada) Limited. All rights reserved.