AOR LA380 User manual

HI-Q active loop aerial
LA380
Instruction Manual
AOR,LTD.
AuthorityOnRadiocommunications
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The LA380 is a compact active (30cm diameter) loop aerial specifically
designed to provide good reception when away from the main
monitoring location or when large external aerials are not practical.
Compact, but achieving high performance, featuring an internal
high-gain amplifier (20dB for 10kHz-250MHz) and excellent overall
strong signal handling (high IP3 +10dBm).
LA380 vs. its predecessor LA350
With similar performances, the LA380 has following advantages:
-Wider frequency coverage (10kHz-500MHz), LA350 covering only 200kHz-30MHz.
-Full frequency coverage (10kHz-500MHz) with one single receiving element! LA350 needed 4 switchable
elements.
Directionality / reception pattern properties
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A rotating loop antenna is very directional. The loop will allow signals on opposite sides to be received,
while off the sides of the loop the signal will decrease or be nulled out.
For example the nulling feature will allow you to remove a station on a frequency and pick up another
(transmitting from a different direction) on the same frequency. Of course the directional characteristics
when listening to distant sky-wave signals will not be as pronounced as local ground-wave propagation.

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Thanks to its directionality, it is also ideal for minimizing the effects of unwanted interfering local terrestrial
signal and noise.
The loop element features a 5 positions band switch and a High-Q poly-variable capacitor to tune and peak
the wanted frequency, while achieving maximum rejection of unwanted out of band signals ? valuable
additional selectivity for your receiverf sfr on-end stages.
Using the LA380 active loop aerial
1) Connect the power supply to the rear
panel DC input socket, the LA380 requires
12V DC at 50mA (9-15V DC). A 9V
regulator is built into the LA380 control unit.
To minimize noise, keep the power supply
as far away from the LA380 as practical. To
minimize electrical interference from the
power supply, for the receiving range
between 10kHz and 1.6MHz, you may wish
to consider use of a (non supplied) low
noise regulated power supply.
2) Connect the supplied BNC-BNC coaxial
lead between the LA380 and your receiverf s aeri al i nput. If your r ecei ver i sfitt ed wit h a connect or ot her t han
BNC, an appropriate adaptor must be used.
3) Insert the receiving loop element into the top panel BNC socket of the LA380 cabinet.
4) Push the red front panel power switch, the green LED will illuminate to confirm that power is connected to
the control unit.
5) Switch on the receiver and tune to the desired frequency. Select the correct frequency range with the
band switch on the loop element. There are 5 positions to choose from:
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60 kHz to 3 MHz
40 MHz to 500 MHz.
Others
Shortwave bands 33 to 7 Meters.9-40 MHz
Shortwave bands 100 to 30 Meters.3-10 MHz
Specifically for US, UK & Japan time signal. 60 kHz
Specifically for Japan time signal40 kHz
CommentsFrequency

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6) Rotate the tuning dial on the loop element (clockwise and anticlockwise) until the receiverf s si gnal
strength meter (S-meter) deflects to maximum and the incoming signal sounds clearest. If your receiver
does not have an S-meter, simply adjust for maximum received signal. Rotate the loop element until the
signal is strongest and any interfering signal is nulled.
It is advisable to locate the LA380 close to a window in
order to achieve the best possible reception.
In case your listening station is too far way from a
window, you have the possibility to use a (non-supplied)
BNC-BNC coaxial patch lead between the control box
and the loop.
The lead shouldn t be longer than 5m.
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Specifications subject to change without notice or obligation.
LA380 Control box with loop
AC power supply
BNC
-
BNC Coaxial patch lead
Supplied acc.
External DC 12V (9-15V), approx. 50mA. Power
1m RG58A/U (BNC plugs)
Cable
10
kHz
-
500MHz
Frequency range
BNC
Connector
Approx.500g without accessoriesWeight
50
Ohm
Impedance
LA380
Specifications:

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Precautions
The LA380 is NOT intended for transmit purposes.
The LA380 is intended for indoor use only, do not use it outdoors.
We are not responsible for any damages to the antenna or your radio equipment due to
improper use.
E&OE AOR LTD, 2005
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Version of June 15, 2005
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Copyright c 2005 All rights reserved
AOR, LTD.
2-6-4, Misuji, Taito-Ku
Tokyo, 111-0055, Japan
http://www.aorja.com