Wireless Digital Audio Link


Studio To Transmitter (STL) Digital Stereo Audio Microwave Link

 

NO License Required! NO Monthly Internet Bills!

This affordable digital audio link provides line of sight coverage of up to 5 miles.  The equipment has been pre-configured to allow almost plug and play installation.

The 5 GHz transmitter and receiver are designed to automatically select a frequency free of interference from other signals.

The analog to digital encoder and digital to analog decoder units have high impedance RCA stereo jacks. An optional level converter is available to change these inputs and outputs to balanced XLR type connections.

 

 

The audio link uses a pair of 5 GHz microwave units to transmit and receive the digital audio stream.  These units are mounted outdoors on a tall tower or other support structure. An Ethernet cable connects these outdoor units to power inserters (POE) that are powered from 120 volts AC.  The single Ethernet cable provides both power and data at a distance of up to 300′.

Both outdoor units need to be mounted in clear line of sight of each other for maximum distance.  Each outdoor unit is small in size and only weighs about 1.1 lb (0.49kg). An adjustable metal clamp is used to fasten the outdoor units to a mast or tower leg up to 3″ (7.62 cm).

The Ethernet cable plugs into the bottom of the outdoor unit and is covered by a removable panel to prevent exposure to rain.  An LED signal strength indicator is provided on the back of the receiver.

The digital audio encoder converts stereo analog audio to a digital signal and sends it to the outdoor microwave transmitter through the Ethernet cable.  When the digital signal arrives at the microwave receiver, it is sent through the Ethernet cable to the decoder where it is converted back to an analog signal.  The encoder and decoder have unbalanced RCA stereo connections.  An option audio converter is shown below if balanced audio is required. Power supplies are included.

Optional CleanBox Pro Balanced Audio Converters

Optional CleanBox Pro Balanced Audio Converters

The optional CleanBox Pro balanced audio converters allow the conversion between unbalanced and balanced stereo audio from the encoder and decoder.A 3.5mm stereo audio cable connects between these units and the encoder and decoder.  Separate left and right audio controls allow for proper levels between your equipment and the digital link.

Microwave Link

Spectrum

CHANNEL SPACING: Configurable on 5 MHz increments
FREQUENCY RANGE: 5150 – 5970 MHz (exact frequencies as allowed by local regulations) CHANNEL WIDTH: 20 MHz or 40 MHz

Interface

MAC (MEDIA ACCESS CONTROL) LAYER: Cambium Proprietary
PHYSICAL LAYER: 2×2 MIMO/OFDM
ETHERNET INTERFACE: 100 BaseT, Cambium PoE (V+ = pins 7 & 8, Return = pins 4 & 5)
PROTOCOLS USED: IPv4, UDP, TCP, IP, ICMP, SNMPv2c, HTTPs, FTP
NETWORK MANAGEMENT: HTTPs, FTP, SNMPv2c VLAN: 802.1Q with 802.1p priority

Performance

ARQ: Yes
NOMINAL RECEIVE SENSITIVITY (W/ FEC) @ 20MHZ CHANNEL: MCS1 = -90 dBm to MCS15 = -62 dBm (per branch)
NOMINAL RECEIVE SENSITIVITY (W/ FEC) @ 40MHZ CHANNEL: MCS1 = -87 dBm to MCS15 = -59 dBm (per branch)
MODULATION LEVELS (ADAPTIVE): MCS1 (QPSK 1/2) to MCS15 (64QAM 5/6) LATENCY: (nominal, roundtrip) 6 ms (Flexible Frame Mode)
QUALITY OF SERVICE: Three level priority (Voice, High, Low) with packet classification by DSCP, COS, VLAN ID, IP & MAC Address, Broadcast, Multicast and Station Priority
TRANSMIT POWER RANGE: -17 to +30 dBm (combined, to regional EIRP limit) (1 dB interval)
MAXIMUM TRANSMIT POWER: 30 dBm combined (subject to regional regulatory restrictions)

Physical

ANTENNA CONNECTION: Integrated antenna
SURGE SUPPRESSION: 1 Joule Integrated
ENVIRONMENTAL: IP55
TEMPERATURE: -30°C to +60°C (-22°F to +140°F)
WEIGHT: 0.49 kg (1.1 lb.)
WIND SURVIVAL: 145 km/hour (90 mi/hour) with antenna
DIMENSIONS: (H x W x D) 29.1 x 14.5 x 8.3 cm (11.4 x 5.7 x 3.3 in)
POWER CONSUMPTION: 7 W Maximum, 5 W
Typical INPUT VOLTAGE: 10 to 30 V

Security

ENCRYPTION: 128-bit AES (CCMP mode)

Certifications

FCCID: Z8H89FT0006 INDUSTRY CANADA CERT:  109W-0006

Antenna Details

ANTENNA TYPE: INTEGRATED INTEGRATED
TYPICAL GAIN:  14 dBi 3dB
BEAMWIDTH-AZIMUTH:  30°
3dB BEAMWIDTH-ELEVATION:  20° POLARIZATION(S): DUAL LINEAR, H/ V
FRONT-TO-BACK ISOLATION:  >20 dB CROSS POLARIZATION:  15 dB

Audio Encoder / Decoder

AUDIO SAMPLING BITRATE: 192 kbit/s
AUDIO BANDWIDTH: 20Hz to 20KHz
DECODER FULL SCALE OUTPUT: 5.6 dBu, 4Vpp
DECODER OUTPUT IMPEDANCE: 40-60 ohms
DECODER AUDIO OUTPUT CONNECTION: 3 pole 3.5mm jack & RCA stereo jacks
ENCODER INPUT IMPEDENCE: unbalanced 2K ohms
ENCODER AUDIO INPUT CONNECTION: stereo RCA jacks

 

 

CleanBox Pro Balanced Audio Converter

FREQUENCY RESPONSE: 20Hz to 20KHz
TOTAL HARMONIC DISTORTION: <0.1% @ 1KHz
SIGNAL TO NOISE RATIO: >90db
INPUT IMPEDANCE: Balanced 20K ohms. Unbalanced 100 ohms
MAXIMUM GAIN: Balanced to Unbalanced -6db. Unbalanced to Balanced +21db
MAXIMUM INPUT LEVEL: +21dBu
MAXIMUM OUTPUT LEVEL: Balanced +21dBu. Unbalanced +15dBu
OUTPUT IMPEDANCE: Balanced 100 ohms. Unbalanced 300 ohms
POWER REQUIREMENTS: 7.5 – 12 volts AC/DC <150ma
DIMENSIONS: 1.85″H x 4.6″W x 4.3″D (47mm x 117mm x 109mm) WEIGHT: 1.10 lbs (0.50 kg)
Click here for a link to the CleanBox Pro website