Senstar Corporation 24000 User Manual
page 4
E6DA0209-001, Rev B
Senstar-Stellar and the Senstar-Stellar logo are trademarks of Senstar-Stellar Corp. Copyright © 2002. All rights reserved.
The information in this application note is subject to change without notice. Printed in Canada.
The information in this application note is subject to change without notice. Printed in Canada.
Senstar-Stellar Corporation
119 John Cavanaugh Drive
Carp, Ontario
Canada K0A 1L0
Telephone: +1 (613) 839-5572
Fax: +1 (613) 839-5830
119 John Cavanaugh Drive
Carp, Ontario
Canada K0A 1L0
Telephone: +1 (613) 839-5572
Fax: +1 (613) 839-5830
Website: www.senstarstellar.com
Senstar-Stellar, Inc.
43184 Osgood Road
Fremont, CA
USA 94539
Telephone: +1 (510) 440-1000
1-800-676-3300
Fax: +1 (510) 440-8686
email: info@senstarstellar.com
43184 Osgood Road
Fremont, CA
USA 94539
Telephone: +1 (510) 440-1000
1-800-676-3300
Fax: +1 (510) 440-8686
email: info@senstarstellar.com
Senstar-Stellar Limited
Orchard House
Evesham Road
Broadway, Worcs.
U.K. WR12 7HU
Telephone: +44 (1386) 834433
Fax: +44 (01386) 834477
Orchard House
Evesham Road
Broadway, Worcs.
U.K. WR12 7HU
Telephone: +44 (1386) 834433
Fax: +44 (01386) 834477
Senstar GmbH
Riedheimer Str. 8
88677 Markdorf
Germany
Telephone: +49 (7544) 95910
Fax: +49 (7544) 959129
Riedheimer Str. 8
88677 Markdorf
Germany
Telephone: +49 (7544) 95910
Fax: +49 (7544) 959129
Senstar-Stellar Latin America
Pradera No. 214
Col. Pradera
Cuernavaca, Morelos
62170, Mexico
Telephone: +52 (777) 313-0288
Fax: +52 (777) 317-0364
Pradera No. 214
Col. Pradera
Cuernavaca, Morelos
62170, Mexico
Telephone: +52 (777) 313-0288
Fax: +52 (777) 317-0364
Heavy snow areas
Snow accumulation decreases the effective mounting
height. This moves the operating point toward
destructive phasing, which could result in degraded
performance. To compensate for snow accumulation, the
setup of the upper unit should be changed as follows:
height. This moves the operating point toward
destructive phasing, which could result in degraded
performance. To compensate for snow accumulation, the
setup of the upper unit should be changed as follows:
•
Select the height of the upper pair to be at a point of
destructive phasing midway between two nodal
lines. (As snow accumulates, the effective mounting
height will decrease and the operating point will shift
toward an area of constructive phasing).
destructive phasing midway between two nodal
lines. (As snow accumulates, the effective mounting
height will decrease and the operating point will shift
toward an area of constructive phasing).
•
Check the signal strength of the upper unit
according to the product manual. If the signal
strength meets the specification for proper
operation, do NOT adjust the mounting height. If the
signal strength is below the specification, reduce the
mounting height in small increments, until the signal
strength meets the minimum specification.
according to the product manual. If the signal
strength meets the specification for proper
operation, do NOT adjust the mounting height. If the
signal strength is below the specification, reduce the
mounting height in small increments, until the signal
strength meets the minimum specification.
•
Ensure that both units of each pair are in a correct
line-of-sight adjustment.
line-of-sight adjustment.
Advantages of microwave stacking
•
increased zone height
•
increased Probability of Detection (PD)
(There is double coverage from the two pairs for
most of the zone.)
(There is double coverage from the two pairs for
most of the zone.)
•
With an X-Band, K-Band combination, the lower
K-Band unit is more sensitive to slow-moving, and
crawling intruders.
The upper X-Band unit is more sensitive to faster,
upright intruders. This combination provides
increased detection against both types of intruders
K-Band unit is more sensitive to slow-moving, and
crawling intruders.
The upper X-Band unit is more sensitive to faster,
upright intruders. This combination provides
increased detection against both types of intruders
Disadvantages of microwave stacking
•
The cost is almost doubled
•
The probability of nuisance alarms is increased
•
If the lower unit is a K-Band microwave, there may be
an increase of nuisance alarms from rain and snow
an increase of nuisance alarms from rain and snow
•
There is a greater potential for interference between
microwave pairs
microwave pairs
•
Because the upper unit is so high above the ground,
its operating characteristics (received signal) can
change from constructive phasing (strong received
signal) to destructive phasing (weak or no received
signal) with a slight change in mounting height
(Although the mounting height is optimized during
installation, snow accumulation changes the effective
mounting height. Therefore, during a snowstorm as
the snow accumulates on the ground, the operation
of the upper microwave pair can become unreliable.
Some measures can be taken during installation to
anticipate this effect. However, sufficient snow
accumulation will severely affect performance.)
its operating characteristics (received signal) can
change from constructive phasing (strong received
signal) to destructive phasing (weak or no received
signal) with a slight change in mounting height
(Although the mounting height is optimized during
installation, snow accumulation changes the effective
mounting height. Therefore, during a snowstorm as
the snow accumulates on the ground, the operation
of the upper microwave pair can become unreliable.
Some measures can be taken during installation to
anticipate this effect. However, sufficient snow
accumulation will severely affect performance.)
Conclusion
For most installations, the mounting height and
detection coverage of Intelli-WAVE will provide sufficient
protection against bridging attempts, as long as the
recommendations for zone coverage overlap are
followed correctly.
detection coverage of Intelli-WAVE will provide sufficient
protection against bridging attempts, as long as the
recommendations for zone coverage overlap are
followed correctly.
When the stacking of bistatic microwave sensors is
required, Senstar-Stellar recommends the use of two
Intelli-WAVE (MPS 4100) X-Band units:
required, Senstar-Stellar recommends the use of two
Intelli-WAVE (MPS 4100) X-Band units:
•
Intelli-WAVE is easily field-configured
•
Intelli-WAVE antenna elements are field-rotatable
•
Intelli-WAVE will have fewer nuisance alarms from
weather effects than an X-Band, K-Band combination
weather effects than an X-Band, K-Band combination