Knogo North America Inc UHFWRAP Benutzerhandbuch
Knogo North America
UHF Wrap Desk
Installation Procedure
UHF Wrap Desk
Installation Procedure
Prepared By:
D. Lundquist
Date:
4/2/2000
Revision:
0
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: 1)
This device must not cause harmful interference; and (2) This device must accept any interference received,
including interference that may cause undesired operation. This device complies with RSS-210 of Industry
and Science Canada. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) This device must accept any interference, including interference that may
cause undesired operation of the device.
This device must not cause harmful interference; and (2) This device must accept any interference received,
including interference that may cause undesired operation. This device complies with RSS-210 of Industry
and Science Canada. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) This device must accept any interference, including interference that may
cause undesired operation of the device.
USER NOTICE
The KNOGO system operating on your premises is registered with the FCC in compliance with Part 15
rules. The FCC identifier for this equipment can be found on a label which is affixed to the system itself.
The FCC requires that the following statement be supplied to all users of registered equipment.
rules. The FCC identifier for this equipment can be found on a label which is affixed to the system itself.
The FCC requires that the following statement be supplied to all users of registered equipment.
CAUTION
CHANGES OR MODIFICATIONS NOT EXPRESSLY APPROVED BY THE PARTY RESPONSIBLE
OR COMPLIANCE TO THE FCC RULES COULD VOID THE USER'S AUTHORITY TO OPERATE
THIS EQUIPMENT.
OR COMPLIANCE TO THE FCC RULES COULD VOID THE USER'S AUTHORITY TO OPERATE
THIS EQUIPMENT.
1.0 System Description.
The Ranger III Wrap Desk is an accessory normally used the Ranger III UHF EAS detection system. The
Ranger III system itself provides the ability to detect small, diode-based tags in a zone extending up to 12 ft
(3m) from the system. The system is normally installed concealed in a ceiling above the desired detection
zone providing coverage down to the floor and up to 20 ft wide for a single system. The Wrap Desk is
normally installed at the point of sale register and detects the same tags on merchandise at a much smaller
range. Sales personnel can then be made aware of concealed tags on merchandise that is being rung-up at
the register. This prevents embarrasing alarms on paying customers if they were to exit the store with
tagged merchandise.
Ranger III system itself provides the ability to detect small, diode-based tags in a zone extending up to 12 ft
(3m) from the system. The system is normally installed concealed in a ceiling above the desired detection
zone providing coverage down to the floor and up to 20 ft wide for a single system. The Wrap Desk is
normally installed at the point of sale register and detects the same tags on merchandise at a much smaller
range. Sales personnel can then be made aware of concealed tags on merchandise that is being rung-up at
the register. This prevents embarrasing alarms on paying customers if they were to exit the store with
tagged merchandise.
The transmit signal from the system is a 916MHz carrier which is switched at 4KHz rate between two ¼
wave antennas built into the unit. This modulation provides both spacial diversity to eliminate nulls, and a
unique signature the receiver can use to eliminate false alarms. Transmit power is approximately 0dBm
(0.001W).
wave antennas built into the unit. This modulation provides both spacial diversity to eliminate nulls, and a
unique signature the receiver can use to eliminate false alarms. Transmit power is approximately 0dBm
(0.001W).
The tags are optimized to produce large amounts of second harmonic re-radiated field when exposed to the
916MHz carrier from the transmitter. Tags are made up of zero-bias Schottkey diodes attached to stamped
brass antennas which are mounted inside molded plastic housings.
916MHz carrier from the transmitter. Tags are made up of zero-bias Schottkey diodes attached to stamped
brass antennas which are mounted inside molded plastic housings.
Receive 1830MHz second harmonic from the tags is picked up via an single1830MHz quarter wave
antenna encorporated onto the main PCB. After being filtered and amplified, the receive signal is fed to a
diode detector to extract the 4KHz modulation. The detector output is further amplified and filtered at
baseband before being fed to a 12bit analog to digital converter. The digitized baseband signal is then
processed by a DSP (digital signal processor) to provide additional filtering and false alarm rejection. The
output of this DSP is a signal which finally drives an integral piezo audio alarm.
antenna encorporated onto the main PCB. After being filtered and amplified, the receive signal is fed to a
diode detector to extract the 4KHz modulation. The detector output is further amplified and filtered at
baseband before being fed to a 12bit analog to digital converter. The digitized baseband signal is then
processed by a DSP (digital signal processor) to provide additional filtering and false alarm rejection. The
output of this DSP is a signal which finally drives an integral piezo audio alarm.