AOR LA400 User manual

Since the invention of this revolutionary
concept by KOLSTER in 1915, loop
antennas, especially of the active type,
have also been widely used by the
military in the 70’s, before becoming
very popular among hobby listeners.
In recent years, the increase in
man-made local noise (typical city noise)
poses a problem for the reception of
distant signals in the long wave, medium
wave and shortwave bands. LA400 is our
latest product based on the technology
we developed since the original LA320
loop antenna. In addition to its
exceptional directivity in order to
minimize the effects of local noise, the
revolutionary LA400 offers, with its
REMOTE TUNING SYSTEM, the perfect
solution to keep the antenna away from
noise sources by setting it up in quiet
areas!
While the control (tuning) box stays at
hand’s reach, the loop element can be
set away by using simple LAN and BNC
coaxial cables.
10kHz to 500MHz, 5 position band switch
to peak only on the wanted signal. Small
size 30.5cm diameter loop with
exceptional 20dB gain.
L A400 MAGNETIC
LOOP ANTENNA
10KHZ-500MHZ

FEATURES
Ultra-wide reception range 10kHz 〜 500MHz. Four band selectable
between 150kHz 〜 30MHz and precisely tunable for best receiving
experience. Sharp alignment characteristics by electronic tuning.
Exceptional 20dB gain thanks to built-in low noise amplifier.
Shield loop antennas have the advantage, over non shielded ones, to
be very robust against local noise from electrical devices such as
televisions, PCs, fluorescent lightening, switching power supplies, etc...
Remote tuning – Unlike previous amplified indoor loop antennas, the
band switching and fine tuning controls are not tied anymore to the loop
element. With these controls now on the control box and by using the
optional LA400-RCK extension cables, it is now possible to tune the
antenna while the loop element is setup at the most reception friendly
location possible (window, covered balcony, etc...). Compatible with 3rd
party cables. Maximum length: 20m.
A relay system is used for band switching, providing excellent isolation
characteristics. The relay is efficiently placed inside the loop element,
while you can operate it through the control box via the control cable.
Electronic tuning from 150kHz〜30MHz allows very sharp tuning to
the desired frequency. Shift the aligning point slightly to attenuate
unwanted signals while amplifying the wanted signal.
Any type of receiver - LA400 can accommodate not only any kind of
communications receiver between 10kHz and 500MHz, but also your
beloved antique vacuum tube receivers, especially with option MC-600
described on the right side. Can also be used as an antenna for portable
FM radios, while improving tuner performance (selectivity).
SPECIFICATIONS
LA400 Magnetic loop antenna
Frequency range 10kHz 〜 500MHz
Aligned range 150kHz 〜 30MHz 4 band selectable
Unaligned range 10kHz 〜 150kHz, 30MHz 〜 500MHz
Gain 20dB min.
Operating temp. -10℃ 〜 +60℃
Power req. 9〜15V DC, 80mA @ 12VDC
(Min. voltage 12V when using an extension)
Impedance 50Ω
Sizes (mm)
projections incl.
Loop 305mm diameter
Loop element 305(W)x367(H)x38(D)
Control box 118(W)x59(H)x112(D)
All assembled 300(W)x425(H)x110(D)
Weight Loop element 220g
Control box 300g
Supplied
accessories
Control cable (LAN type) 30cm
AC power supply
BNC (F)/BNC (F) RG-58U coaxial cable (1m)
Printed user manual
LA400 is NOT intended for transmit purposes!
Not waterproof, use only indoors.
OPTIONAL ACCESSORIES
LA400-RCK Extension cables (10m each)
This set of cables allows you to separate the control (tuning) box from the
loop element, by up to 10m. Conveniently place the loop element as closely
as possible to an open space, such as window, covered balcony, etc...away
from local electrical noise, for a quieter reception experience.
MC-600 Impedance matching transformer
Passive impedance matching transformer interface which allows your LA400
to be connected to any antique receiver with a 600Ω antenna terminal.
Supported frequency range: 10kHz to 30MHz. MC-600 has the same
isolation feature than the GT-1 accessory described below.
GT-1 Galvanic isolation transformer
To be connected between the receiver and the LA400 antenna. Does greatly
reduce local noise by breaking the ground loop effect between antenna and
receiver, especially when the LA400-RCK 10m separation cables are used.
Supported frequency range: 40kHz to 30MHz
Product specifications and design subject to change without prior notice
AOR, LTD.
2-6-4 Misuji, Taito-ku, Tokyo 111-0055, Japan
Tel:[phone] Fax:[phone]
www.aorja.com
10m of RG-58/U coaxial
cable with BNC female
connectors.
10m control cable of
LAN type
(Sept.25, 2013)