Specifications

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for the receiver.
INSTALLATION
The ALA 1530 Loop Antenna comprises of a loop/amplifier Head Unit together with an Antenna Interface and a
12 volt regulated power supply. RG58C 50 ohm coaxial feeder cable is recommended for the antenna. The
maximum feeder length is 100m. The Antenna Interface feeds the 12 volt dc power to the antenna. A 1m coax.
lead connects the Antenna Interface to the receiver.
The ALA 1530 and the ALA 2000 should be positioned away from sources of interference such as fluorescent
lights, TVs, computers and electrical wiring. In most cases satisfactory results can be obtained by mounting the
antenna at ground level.
TECHNICAL INFORMATION
Power consumption:
12 volts at 120mA
Intermodulation typically:
With two signals of 30mV 2nd order -87dB
3rd order -114dB
Intercept point typically:
2nd order +70dBm
3rd order +40dBm
1dB compression point: +25dBm
Output impedance: 50 ohms, BNC Connector
TYPICAL INSTALLATION
Active Loop Antenna Model ALA 1530
150kHz-30MHz 1m dia. Aluminium Loop
The Wellbrook Active Loop ALA1530 long, medium and shortwave antenna.
This unique broadband magnetic antenna is only 1m diameter and rotatable to provide deep nulls to reject noise
and interference. Ideal for users with small gardens... This new broadband untuned Loop antenna is the only
active antenna designed specifically to reject locally radiated and mains borne noise from TVs, computers, mains
wiring etc.
The Loop antenna responds primarily to the Magnetic-Field and rejects locally radiated Electric-Field noise
providing far lower noise reception than active whip/dipole antennas. Compared to active whip/dipole antennas,
the Loop will reduce locally radiated noise by up to 30dB and mains borne noise by up to 60dB. The ALA 1530
has 30dB nulls to further reduce interference.
It is ideal for small gardens, indoors and directional reception using an antenna rotator.
The ALA1530 offers significant advantages over the traditional tuned Loop, because the Loop can be used away
from local interference. Whereas, a tuned Loop has to be positioned next to the receiver where there are high
levels of local noise.
This antenna is probably the most advanced broadband active Loop antenna available to the Short Wave
Listener, offering professional performance at an affordable price. The Loop antenna is supplied with an Antenna
Interface and a 12 volt regulated Power Supply (UK only).
An Indoor version, the ALA 1530P with a semi-rigid Loop is also available.
Large Aperture Active Loop Antenna Model ALA100
50kHz to 30MHz.
The Wellbrook Large Aperture Loop ALA100 is a specialists antenna designed for the long wave and medium