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3.
4.
5.
MOUNTING THE 7920SE
Connect the antenna to the Transceiver using 50 ohm coaxial cabte. To avoid
signal loss through attenuation, cable lengths should be 25 feet or less. Use
onty the cables and No. 7670 bracket avaitable from Ademco. To insurs the
integrityof the eecwfty system, do not assemble your own extension cables.
Order the followingcable lengths
5 feet
=
No. 7626-5
12 feet =
No.
7626-12
25 feet =
NO.
7626-25LL
Tapa atl conn~"ons with a quality insulatingtape.
IMPORTANT!
With cable Ienaths over 25 feet. the Hiah Securitv check
may fail to indicate a fault if ca61e tampering occurs. To ~~ if the=
is
tamper protected, trigger an alarm message transmission (after first pmperfy
wiring and powering unit) and monitorthe "Radm OW terminat (TB2 pin 7). It
should read a voltage of about +5VDC (If it reads a low voltage white the
antenna is connected, the cable is defective and should be reptaced).
Disconnect the antenna from the end of the cable and trigger another alarm
transmission. The voltage should now below. tf it still reads hii,
the cable is
too tong. Use a shortercable and repeat the test.
No. 7625-3dB
and No. 7674 Antennas
In the event that acceptable signal strength cannot be achieved using the No.
7625 antenna, the optional No. 7625-3dB high gain or No. 7674 YAGI antanna
may be used. The No. 7625-3dB adds about 3dB gain when compared to the
standwd No. 7625, and mounts in exacttythe same way.
The No. 7674 antenna mounts outdoorsin a suitabte tocation@tacketement up)
using the bracket supptied (the No. 7670 bracket is not required), has directkmd
characteristics,and must be aimed in the direction wh~h provides the stmgeat
signal. Once this direction has been determined, the antenna should be
pennanenttymounted in preciselythe same position. Connect the antenna to the
7920SE using the shortest of the available f~
ohm coaxial cables whii
witl
reach. Tape atl connectionswith a good qualii instating tape.
INSTALLING
CHASSIS
TAMPER
SWITCHES
If chassis cover tamper protection is desired, mount Ademco No. 945WH or No.
945BR tamper switchesto both chassis covers, wiringthem in series with the "+"
lead of the first switch connected to TB1-5, and the outgoing lead of the tast
switchconnected to one of the six channel inputterminats ~
pins 1-6). When
mountfngthese switches, do not exceed a gap of
7/6-
between the contact and
the magnet.
Note that tamper protection
k required
for (X
"AA" rated
installations.
-20-
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