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Active Loop ALA1530S+ Imperium

Brand: Wellbrook
Product Code: ALA1530SP-1
Out Of Stock
Price inc VAT: £322.80
Ex Tax: £269.00
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Review by RadioUser

Reproduced with kind permission of the copyright owner PW Publishing Ltd

No Longer Manufactured - replaced by the ALA1530LNP

Re-engineered Active Loop Antenna ALA1530S+ Imperium

50kHz-30MHz 1m dia. Aluminium Loop

The design of this new loop is now based on the recently upgraded ALA1530.
The Head Amplifier noise has been lowered and the loop MW OIP3 has been increased.
LF gain extended down to 50kHz
HF gain and s/n have been improved by approx. 3dB.
Unique 2 transformer Norton amplifier with a higher HF gain is now fitted in the Antenna Interface.
MW OIP3 has been increased to +55dBm; thus giving  this active antenna one of the highest third order intercept points in its class. Also the MW OIP2 has been improved to +90dBm.

This new antenna is believed to be the highest gain active loop to provide coverage from VLF to HF with low Intermodulation.

An FM band filter is now fitted. A resettable fuse is now fitted to the Antenna Interface.

The mechanical design is now improved to afford increased reliability and to facilitate ease of servicing:
The amplifier is now house in a separate module, thus isolating the electronics from the mechanical stress caused by wind loading on the loop. The amplifier to loop wire terminations use tin plated silicone insulated wire and crimp terminals rated down to –40 Celsius.  The module sits on of the loop box and is secured by stainless steel screws.

The amplifier module can be easily replaced in the unlikely event of a failure, without the customer having purchase a new loop antenna with the associated high shipping costs.
A new retrofit amplifier is now available for all pre April 2014 loops at a reasonable cost.

Due to the high gain of this antenna, it should not be used close to high power transmitters, otherwise this may cause receiver overload problems.

This Balanced low impedance Magnetic loop has enhanced performance compared to shielded and Moebius loop types. The unique use of an amplifier to match the loop's reactance is a technological breakthrough in Broadband loop design.

Comparison of the Mobius Loop verses a Wellbrook loop

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 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 1530S+ has up to 30dB nulls to further reduce interference.

It is ideal for small gardens and directional reception using an antenna rotator.

The ALA1530S+ 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.

The Loop antenna is supplied with an Antenna Interface and a 12 volt regulated Power Supply.

UK, European and North American version with psu.

Product Details


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