SUPER LOOP ANTENNA
Contents
1. AOR SUPER LOOP ANTENNA LA800 Instruction manual AOR Ltd Authority On Radio Communications Table of contents Introduction 2 22 82 eo ea a eee Included in this package 222 nenn eeene ernennen Hardware Setup ee ee ee teens Operating instructions 2 0 ce ens Directivity of a loop antenna 0 00 eee Characteristics of a shielded loop antenna Options viral ii Specifications o o oooooooonoon nor 1 Introduction Thank you for purchasing the LA800 SUPER LOOP ANTENNA LA800 is AOR s new and first OUTDOOR and WATERPROOF shielded loop antenna for reception between 10kHz and 500MHz To get the best possible results from your LA800 we recommend that you read this manual and familiarize yourself with the antenna First a word of caution LA800 is a RECEIVE ONLY antenna Do not transmit with it or its circuitry will be severely damaged maybe even beyond repair 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 LA800 is our latest product based on the technology we developed since the original LA320 indoor loop antenna In addition to its exceptional directivity in order to minimize the effects of local noise the revolutionary LA800 offers with its REMOTE TUNING SYSTEM the perfect solution to keep the antenna a2. ignal strength is greatest in the directions indicated by the arrows Horizontal radiation pattern of LA800 NULL Angle from which magnitude of the radiation pattern decreases to zero In other words these are the sides from which the antenna receives the least Maximum reception performance is achieved when these sides of the loop face the signal 6 Characteristics of a shielded loop antenna Ashielded loop antenna is less susceptible to nearby electrical interference sources thanks to the electrostatic shielding of the loop afforded by the grounded metallic conduit enclosing the wire coils By these principles LA800 responds to the magnetic field rather than the electric field thus efficiently isolating the low frequency electrostatic noise from the distant signal to be received Shield circuit of LA800 y I I With this design all parts of the loop will have the same capacitance to ground The shield also protects the loop from the induction field created by nearby disturbances The induction field refers to the electric and magnetic fields in the immediate vicinity of an antenna Those fields decrease rapidly in strength with distance and the induction field is usually ignored However wires and other metal objects near the loop can take energy from a passing wave and produce induction fields that can induce spurious voltages in the loop A shield over a loop antenna will not appreciably dec
3. loop element box _ _ sass a 4800 Super Loop Antenna nenas 3 Hardware setup Caution LA800 is a RECEIVE ONLY antenna Do not transmit with it or its circuitry will be severely damaged maybe even beyond repair As pictured below mount the LA800 loop element to a non supplied antenna mast using the supplied U bolts Antenna masts are typically sold at home centers Antenna mast use 30 to 60mm dia meter SAFETY PRECAUTIONS If you are installing an antenna for the first time for your own safety as well as others seek professional assistance Installation of this antenna near power lines is dangerous Do not work on the system or connect or disconnect cables during periods of lightning activity Do not work on a wet or windy day Do not locate the antenna near overhead power lines or other electric light or power circuits or where it can come into contact with such circuits When installing the antenna take extreme care not to come into contact with such circuits as they may cause serious injury or death For balcony mount you can also use typical satellite dish balcony mounts as pictured below Such mounts are not supplied by AOR but are usually sold at home centers The loop element s electronic circuitry is housed in an ABS plastic box water and dust proof to IP65 standard The control and coaxial cables enter the plastic box through two rubber gaske
4. nt figures with supplied AC adapter Impedance 50 Ohm Sizes mm projections Loop element 800 W x970 H x84 D included Control box 120 W x38 H x101 D Weight Loop element Approx 1 4kg Excluding mount U bolts Control box Approx 240g Supported mount mast 30 60mm Supplied accessories AC power supply Control cable LAN type 10m BNC F BNC F RG 58U coaxial cable 10m Two U bolts for mast mount Printed user manual e Product specifications and design subject to change without prior notice Assembled dimensions 97cm 10 Memo A l AOR Ltd 2 6 4 Misuji Taito ku 111 0055 Tokyo Japan Authority On Radio Communications www aorja com Sept 25 2013
5. ntenna POWER 3 TUNING f e 2 vr N 4 Z IN N o5 ia E tae o _ y Band switch O Peak the received signal by turning the TUNING knob slowly to either the left or the right The white dot on the tuning know helps you to see the approximate location of the tuning For your reference when the dot is on top as on the above illustration the tuning PEAK is approximately in the middle of the selected band For example for band switch position 1 150kHz to 800KHz it would be roughly peaked on 475kHz Tuning is most critical above 3MHz For best performance of LA800 and optimal reception conditions make sure the selected band is appropriate for the received frequency and search for the signal peak with the tuning knob Aloop antenna is very directional Reception can be improved by using a third party antenna mast rotator and rotate the loop element until your receiver s signal 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 5 Directivity of a loop antenna Asignificant advantage of a loop antenna is its directional pattern a figure 8 shape with two null points separated by 180 degrees The null in reception that is located at right angles to the plane of the loop can be used for interference reduction On the other hand received s
6. rease the amount of magnetic flux that passes through the loop when a wave goes by as long as it does not form a complete turn A gap is left in the shield so that it does not become a shorted turn Without the gap the shield would reduce the magnetic field linking the loop so that no signal could be received by the internal wire With the gap alternating currents can be induced in the metal shield and voltages will be induced in the internal wire 7 Options GT 1 Galvanic isolation transformer To be connected between the receiver and the LA800 antenna Does greatly reduce local noise by breaking the ground loop effect between antenna and receiver Supported frequency range 40kHz to 30MHz MC 600 Impedance matching transformer Passive impedance matching transformer interface which allows your LA800 to be connected to any antique receiver with a 600Q antenna terminal Supported frequency range 10kHz to 30MHz MC 600 has the same isolation feature than the GT 1 accessory 8 Specifications LA800 Super Loop Antenna Loop size Diameter 780mm to the pipe center Loop type Aluminum pipe 20mm 2mm thick Frequency range 10kHz 500MHz Aligned range 150kHz 30MHZz 5 band selectable Unaligned range 10kHz 150kHz 30MHz 500MHz Gain 20dB min Operating temperature 10 C 60 C Power requirements 12 16V DC Power consumption Approx 14mA 100mA band depende
7. ts as shown below Connect these to their respective sockets ANT OUT and REMOTE AOR LA800 SUPER LOOP ANTENNA RECEIVE ONLY 10kHz 500MHz Tuning Range 150kHz 30MHz AOR LTD Den www aorja com www aor co jp ANT OUT REMOTE 4 L Control cable Run the coaxial and control cable a bit below and then back up to the hole into the building thus providing a drip loop to prevent rain from running down the cable and into the building On the receiver side connect the control cable to the control box and the coaxial cable directly to your receivers antenna socket Finally connect the AC power supply to the control box LA800 Loop outdoors Indoors V REMOTE AC y SS A power supply Receiver s antenna input socket To connect LA800 to an antique receiver with 6000 antenna terminal use the optional MC 600 Impedance Matching Transformer 4 Operating instructions Connect the AC power supply and push the red power button on the control box A blue LED will light up Tune your receiver to the desired frequency Now you need to select one of the 6 available band ranges using the band switch numbered from 1 to 6 Refer to the printed switch number band range information on the top of the control box Please note that position 6 is non tunable as the loop is wired to act as an amplified whip a
8. way from noise sources by setting it up in quiet areas While the control tuning box stays at hand s reach the WATERPROOF loop element can be permanently setup outdoors 10kHz to 500MHz 6 position band switch to peak only on the wanted signal Built in low noise amplifier for exceptional 20dB gain Loop element diameter of 80cm for maximum reception performance Remote tuning The supplied 10m control and coaxial cables separating the antenna from the control box allow to conveniently operate band switching and fine tuning controls placed on the control box 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 Waterproof The loop element s electronic circuitry is housed in a ABS plastic box water and dust proof to IP65 standard 2 Included in this package o Description Qty Loop element Two U bolts for mast mount Control box Control cable LAN type 10m BNC F BNC F RG 58U coaxial cable 10m AC power supply Printed instruction manual for Japanese market only O OC COHLLOPilz Product sticker for the
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