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Large Aperture Active Loop Antenna

 	Large Aperture Active Loop Antenna
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Price: £149.00
Availability: In Stock
Model: ALA100HG-2
Manufacturer: Wellbrook

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  • USA, Canada   £15.00
  • UK, Ireland   £5.00
  • Europe   £10.00

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Large Aperture Active Loop Antenna Model ALA100HG

North American version

New High Gain Bipolar Transistor design

50kHz to 30MHz.

The Wellbrook Large Aperture Loop ALA100HG is a specialist's antenna designed for the Long wave, NDB Band and Medium and Short wave DXer.

The antenna uses a 20m circumference thin wire loop to provide optimum S/N. The ALA100HG uses the similar interference reduction properties as the ALA1530.

The Active Loop Antenna ALA100HG is a large aperture antenna designed to provide improved performance compared to traditional active and passive antennas.

The new ALA100HG is the Forth generation of this antenna and uses 4 RF transistors in parallel push-pull with optimum noise-less transformer feed-back resulting in a low amplifier noise floor. 
The gain has been increased by approx. 4dB to 22dB.
The IMD performance is improved too:
Second Order Intercept point is +105dBm
Third Order Intefercept point is +49dBm
Noise Figure at 500kHz is approx. 3dB

 North American version with psu

ACTIVE ANTENNA CONSIDERATIONS

Currently there are several active antennas available providing similar performance.

These active antennas generally fall into two types:

1) Whip and dipoles, responding mainly to the electric field.

2) Loops, responding mainly to the magnetic field

Whip and dipole antennas are more numerous because they easier to design for broadband performance.

The loop antennas are either manually tuned or wideband. The manually tuned antennas can provide excellent results because their selectivity reduces intermodulation products. However, having to manually tune the antenna in step with the receiver is a considerable disadvantage. Thus the broadband loop antenna offer considerable operational advantages. Also it is nearly impossible to obtain a tuned loop antenna that will provide coverage of LW through to SW. In most cases several tuned loops would be required at a considerable cost.

Where active antennas are used in the presence of local interference. The balanced dipole and balanced loop designs provide the best interference rejection. Whip antennas that use the feeder as an RF return path are prone to interference induce on the feeder screen and mains borne noise.

Product Information - click here for pdf

Generally the loop antenna is less sensitive to local interference and static. Also a balanced loop antenna will have a "figure of eight" directivity pattern with deep nulls to further enhance interference reduction.
 

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