Knogo North America WDD Swept RF EAS System User Manual 8 Mhz

Knogo North America Inc Swept RF EAS System 8 Mhz

Contents

8 Mhz

Knogo North America8MHz Wrap Desk DeactivatorInstallation Procedure1.0 System Description.The 8MHz Wrap Desk Deactivator is an accessory normally used with the P and T seriesRF detection systems. The P and T series detection systems provide the ability to detectsmall parallel LC resonant circuit tags in a zone of up to 6 feet between the receiver andtransmiiter antenna. The system is normally installed at the exit doorway to the store. TheWrap Desk is normally installed at the point of sale register and detects the same tags onthe merchandise at a much smaller range. Sales personnel can then be made aware ofconcealed tags on merchandise that is being rung-up at the register. This preventsembarrasing alarms on paying customers if they were to exit the store with taggedmerchandise. It also has the capability to deactivate small disposable tags. Deactivation isacomplished by inducing enough voltage into the tag so as to exceed the breakdownvoltage of the tuning capacitor resulting in a short circuit that turns the tag off.The transmit signal from the system is a sequence of RF bursts between 7.5MHz, and8.9MHz. This signal is amplified and low pass filtered before it is fed to the transceiverantenna loop. During the transmit burst, if a tag is placed close to the antenna it willabsorb energy from the field. After each burst, there is a delay which allows the trasmitteroutput to decay.The receiver processes the remaining signal on the antenna which is the energy releasedby the tag. The signal is detected and is fed to a sample and hold circuit. If the tag has thecorrect signature, the alarm is sounded.
2.0 System Installation.2.1 Unpacking and Inspection.The unit is shipped in a single box containing the following items:Main Chassis16.5VAC wall plug-in transformerAntenna padInstallation Manual2.2 Power Connection.The supplied 16.5VAC wall plug-in transformer has a low voltage line cord terminatedwith a power plug and the antenna pad with a pluggable terminal block. Simply plug theline cord and antenna pad into the chassis and the transformer into a nearby 120VACoutlet. For best performance, route the power cable directly away from the unit. Do notcoil or bundle the power cable near the unit. If excess cable length is available it may becoiled or tied near the power transformer.2.3 System PlacementProper placement of the system is important due to the effect that nearby tags andmetallic objects may have on performance. Two important points govern installation:1: Try to eliminate metallic objects under and in the immediate area surrounting the unit.2: Tag detection below the system is equal to that above. As a general rule try tomaintain at least 4” of clearance below the unit to metallic objects and approximately 5”horizontally. Small objects such as nails, screws and fittings that might be found in non-metallic counter surfaces do not present a problem and need not be consideredProximity of tags to the system is critical. Normal detection range is 12” to 18”vertically. The bin used to hold removed tags should be as far as practical from thesystem. A metallic container will provide a good degree of sheilding. A foil lining on anon-metallic container is also very useful.If any difficulty is encountered move the unit to a location well free of tags and metallicobjects and retest. Be sure to hold the tag by the ends with the tips of your fingers, wellaway from the palm.2.4 AdjustmentsThere are no system adjusments.If 2 or more units interfere with each other, the user must select a different phase foreach unit via the switch located on the front panel. There are 16 phases to choose from.3.0 Specifications.
Agency Approvals: FCC ID#: J3Q8/2MWDDIndustry Canada:ETL:CETL:Power Requirements: 115VAC 60Hz 0.5A maxPhysical Size: Main Chassis: 8” L X 5.25” W X 2” HPower Supply: 16.5VAC, 650mA max.Weight: Complete System: 2 lbs.Operating Temperature Range: 0 to 50 degrees CIndicators: Audible Piezo beeper on Tag detect, Power LEDAntenna: 9.75” L X 8.25” W X 0.375” H

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