Andrew 24GCA User Manual
User and Installation Manual
UltraSpan™
Integrated AAntenna/Gain-ccontrolled,
Bi-ddirectional AAmplifier
2.4-2.5 GHz ISM Band, 420 mW Version
Bulletin 237726
2
System Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Typical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Functional Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Table of Contents
System Description
Antenna
Applications
The UltraSpan™ antenna/amplifier system extends the operating range of broadband wireless systems operating in the 2400-2500 MHz spread spectrum band.
The basic unit consists of a MICROCEPTOR
®
antenna and a built-in bi-directional
amplifier operating in Time-Division Duplex (TDD) mode. It features intelligent
algorithm and Automatic Gain Controlled (AGC) circuits which maintain transmit
power and prevent transmit signal saturation, thus minimizing signal distortion.
The system also includes a universal power supply, a DC power inserter, and
mounting hardware.
The UltraSpan system has applications in a wide range of wireless systems
where TDD technology is used, such as Wireless Local Area Network (WLAN),
Wireless Local Loop (WLL), Wireless Internet Access (WIA), and wireless modem
connection with point-to-point systems.
MICROCEPTOR Antennas are small, aesthetically pleasing antennas for broadband applications. They feature a patented feed design for excellent directivity in
a low profile package.
This key feature automatically detects the power level and adjusts the amplifier
gain to allow for system variables. For example, the AGC adjusts for different
interconnecting cable lengths and radio modems with different output powers.
The AGC Transmit Amplifier is fully operational in a wide transmit input power
range of 1 to 200 mW. An input signal of 2.5 mW delivers the maximum U.S.
FCC specified power level. The AGC attenuates input signals greater than 4 dBm
and maintains a maximum output power of 26.2 dBm.
The amplifier is built into the back of the MICROCEPTOR antenna and is
encased in a weatherproof enclosure. It features a low noise amplifier and an RF
filter that decreases potential RF interference and overload caused by out-ofband frequencies, such as those received from higher power wireless communication systems.
Automatic Gain Control
(AGC)
Low Noise Amplifier
This equipment complies with Part 15 of the U.S. FCC Rules and
Regulations. Any changes or modifications, not expressly approved by
the manufacturer, could void the user's authority to operate the equipment.
Important Notice:
3
110/220 VAC to 7.5 VDC converter.
DC Power Inserter injects the 7.5 VDC onto the coaxial feeder cable to power
the low noise amplifier.
Standard Mounting Hardware consists of a mast clamp and L bolt. Optional
Elevation Adjustable Mount is available.
The table compares the UltraSpan™ amplifier with other TDD antenna-mount
amplifiers.
Amplifier Comparison
ULTRASPAN™ Other TDD Amplifiers
Transmit gain Intelligent self adjusted Fixed
Transmit power level Maintained Varies, depending on
input power level
Transmit signal distortion Minimized at all times Much worse at high input
power levels
Input power range Wide range accepted Designed for narrow
requirements range only
Amplifier Mounting Built into the Antenna Usually tower mounted
Configuration requiring separate instal
lation
Operation
The universal power supply provides the DC power; the radio modem supplies
the RF signal. Both connect to the dc power inserter. The radio signal and the
DC voltage are supplied to the antenna/amplifier via coaxial cable (not included). The antenna installs on a mast.
The system operates automatically and no user adjustments are required.
Features
• Automatic gain control minimizes signal distortion.
• Wide range of transmit input levels (1.4 mW to 200 mW).
• Low noise amplifier provides system noise figure of 3.5 dB.
• Universal, auto switching, 110/220 VAC to 7.5 VDC power adapter.
• Green LED indicates DC power on.
• DC ground for lightning protection.
• Power inserter equipped with surge protection.
• Industry standard "N" connectors ("F" connectors optional).
• Weatherproof, outdoor enclosure.
Mounting Hardware
Universal Power
Supply
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