Sound Devices A20-Nexus Manual


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A20-Nexus
8-, 12-, and 16-Channel, True-Diversity Receiver
with SpectraBand Technology
User Guide v1.50
Table of Contents
Welcome to the A20-Nexus 3
Key Features 3
SpectraBand 4
Digital Wireless Modulation 4
NexLink Wireless Transmitter Control 4
GainForward 4
Architectural Overview 6
Panel Views 7
Typical Setups 11
Quick Start 15
Powering 18
Navigating the A20-Nexus User Interface 20
RX Views 22
Menus 30
RTSA (Real Time Spectrum Analyzer) 32
Scan Mode 35
AutoAssign 35
TX List 37
RF Menu 39
Antenna RF Overload Indication 41
Audio Outputs 41
Timecode 44
Networking 45
System Menu 47
Quick Setup Menu 50
Nexus Web App 52
Updating Firmware 56
Channel Expansion Licenses 56
Accessories 57
A20-QuickDock for 8-Series 57
A20-Monarch Antenna 62
A20-Shelf 62
A20-2.4G Ant+Mount 62
NexLink Status Alerts 64
Frequency Band Restrictions 65
Connector Pin Assignments 66
A20-Nexus Specifications 68
A20-Monarch Specifications 70
Note on RF Interference 71
Servicing the A20-Nexus 71
Warranty 71
Legal Notices 72
Declaration of Conformity 75
A20-Nexus User Guide
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Welcome to the A20-Nexus
The A20-Nexus is an ultra-high performance, 8-, 12-, and 16-channel wireless microphone receiver in a compact ½-rack wide
chassis. It features 8 independent, true-diversity channels which can be expanded to 12 or 16 true-diversity channels via software
license. The A20-Nexus features NexLink, an innovative concept in wireless microphone receivers: full remote control of microphone
transmitters via an integrated, long distance RF link.
The A20-Nexus can be mounted in a standard 19-inch rack or easily placed remotely near the microphone transmitters due to its
ability to be powered by Power-over-Ethernet (PoE+), its Dante audio-over-IP, and built-in web server for control via phone, tablet, or
computer.
Additionally, the A20-Nexus can be docked to Sound Devices 833, 888, or Scorpio mixer-recorders using the A20-QuickDock
accessory, which provides convenient power, audio, and timecode connections with no additional cables. This accessory allows the
A20-Nexus to connect and disconnect from the 833, 888, or Scorpio in seconds with no tools, and be remote mounted when
desired.
Key Features
8-channel ultra-high-performance, true-diversity receivers in a ½ rack size (8.0” x 6.6” x 1.6”).
Expandable to 12 or 16 channels via 4-channel expansion licenses.
169 MHz – 1525 MHz tuning range via SpectraBand Technology.
NexLink: integrated, long distance remote control of all wireless transmitters inc. group power on/off.
Integrated Real Time Spectrum Analyzer (RTSA) and scanning for intuitive frequency coordination.
AutoAssign: automatic deployment of clean frequencies in seconds.
Dante audio-over-IP of RF receiver audio.
Flexible powering: via PoE+, DC input, 8-Series, or AC mains (with optional adapter).
Web App control from browser on any computer, smartphone or tablet.
Full remote operation capability: Power via PoE, audio via Dante, control via Web App.
Dual DB-25 connectors for 16 channels of mic, line, or AES outputs.
Convert 16 channels of Dante to analog & AES on DB25 connectors for sending IFB, VOG & more from mixer to set.
Wide, 6.2” color OLED array with touch for control and monitoring.
Optical Fiber Network option via SFP slot. SFP accepts a wide variety of modular network transceivers.
A20-QuickDock allows docking and undocking in seconds from 8-Series mixer-recorders with no tools.
Supports GainForward Architecture: No gain setting on the A20 transmitter. Adjust gain at the receiver or mixer.
100% digital long-range modulation delivers the longest transmission distance of any digital system on the market.
RF SAW filters for excellent rejection of interference from nearby IFB or camera hop transmitters.
Excellent audio quality, full 10 Hz – 20 kHz audio bandwidth.
BNC timecode input for auto timecode sync of transmitters over NexLink
Front panel and rear panel BNC antenna inputs. Compatible with passive, bias-powered, and smart antennas.
Cascade out option on rear BNCs for cascading multiple A20-Nexus units.
Front-panel headphone output.
USB-A port for thumb drives, keyboards, transmitter pairing, and timecode syncing. Supports USB hubs.
Our friendly and knowledgeable support team, based in the USA and the UK, is here for all your questions and comments.
A20-Nexus User Guide
3
SpectraBand
The A20-Nexus incorporates SpectraBand, a technology that enables the A20-Nexus to tune over a super wide range of 169-1525
MHz. Tuning within this range varies by country.
For instance:
In the USA, the available frequency ranges are:
The VHF band (169-216 MHz)
The entire UHF TV band (470-608 MHz)
The 600 MHz guard band (614-616 MHz)
The 600 MHz duplex gap (653-663 MHz)
The 900 MHz ISM Band (902-928MHz)
The 950 MHz STL Band (941.5-960 MHz)
The 1.5 GHz AFTRCC band (1435-1525 MHz), with an appropriate license.
In the UK, the available frequency ranges are:
The VHF band (173-210 MHz)
The core UK UHF TV band (470-702 MHz)
The 800 MHz duplex gap (823-832 MHz)
The 800 MHz guard band (863-865 MHz)
The DME bands (961-1015 MHz, 1045-1075 MHz, 1105-1154 MHz), with an appropriate license.
The IMT band (1518-1525 MHz)
Please see https://www.sounddevices.com/available-frequencies/ for further detailed information on which frequency ranges are
available for each country.
Tuning Bands
SpectraBand’s 169-1525 MHz range is divided into multiple, tightly-filtered tuning bands. The sharp attenuation at either end of a
tuning band’s range significantly reduces out of band interference resulting in excellent range performance.
Digital Wireless Modulation
Long Range and Standard Modulation
The A20 wireless products offer two proprietary digital modulation schemes that provide unbeatable range, unrivaled audio quality,
and very low latency. Long Range or Standard modulation can be selected on a per-receiver-channel basis. Long Range modulation
has better sensitivity which results in better range. The modulation setting must match between the A20 transmitter, A10-TX and the
A20-Nexus in order for the transmitted signal to be received and decoded.
Intermodulation Immunity
Because the A20 and A10 digital RF transmission is inherently resistant to intermodulation, multiple A10 and A20 Digital Wireless
systems can be used simultaneously on nearby adjacent frequencies without significant worry of intermodulation interference.
Systems can be used together when separated by at least 400 kHz. When operating in the 902-928 MHz Band, it is recommended
to separate channel frequencies by at least 1 MHz.
NexLink Wireless Transmitter Control
NexLink is a proprietary 2.4 GHz bidirectional wireless data link technology that allows multiple A20 transmitters to be controlled,
monitored, and timecode synced from an A20-Nexus over long distance. NexLink is designed to offer robust and reliable control
over distances far exceeding that of the wireless audio transmission, even in the presence of Wi-Fi and Bluetooth interference. An
A20-Nexus can pair with up to 64 NexLinked transmitters.
GainForward
The A20-Nexus supports the A20 transmitter’s GainForward feature. GainForward eliminates the need to adjust microphone
preamplifier gain at the wireless transmitter. Audio levels from the transmitter are controlled either directly from the 8-Series (or any
other mixer) trim controls, or from the A20-Nexus receiver screen. If the talent speaks too softly or emotes too loudly after being
A20-Nexus User Guide
4


Produkt Specifikationer

Mærke: Sound Devices
Kategori: Modtager
Model: A20-Nexus

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