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Selecting a Radio Installation Site
The 7835C is designed to be mounted on a vertical surface (wall), with the included antenna pointing up.
When selecting mounting a site, maintain distances from various types of electrical equipment as listed in
Table 2. Additionally, observe the maximum wire run lengths (see Table 4).
The 7835C is intended for indoor installation only. Mounting outdoors will cause system failure and
may present a shock hazard.
1.
Remove the cover and install a fully charged battery. If a fully charged battery is not available, you can
connect a 16.5VAC / 40VA transformer.
During battery operation, removal of the lower cover will significantly reduce the life of the charge on
the battery. To get the maximum backup battery life in the event of an AC loss, the lower cover must
be replaced when the installation is complete. (Note that the signal strength bar graph located below
this cover is only needed during installation.)
2.
Select a likely location by monitoring the signal strength bar graph. Refer to the Using an Unregistered
7835C as an Installation Tool paragraph below. A strong signal lights more LEDs than a weak signal.
3.
Find a location where the signal level is consistently better than 2 bars or –98dBm as measured with
the 7720P. The 7835C can function properly with the signal strength level as low as one-half bar
(yellow blinking), but this may be an indication of marginal coverage.
Notes:
1.
Optimum RF performance can usually be found at the highest point within a building, with the fewest
number of walls between the radio and the outside of the premises.
2.
Avoid mounting the antenna near other electronic devices. Table 2 provides minimum distances.
Highest RF energy is in the direct, horizontal line of the antenna. Therefore, vertical separation
(moving electronic devices either higher or lower on the wall) provides a higher level of isolation from
the radio.
Table 2. Minimum Distances From Electrical Equipment
Equipment
PIR
FM radio or TV ant.
Other devices
Using an Unregistered 7835C as an Installation Tool
An unregistered 7835C will display signal strength once the initial
power-on sequence is complete.
Use the guide on the right when selecting an installation site.
Select an installation site where the RSSI is between 2 – 5 bars.
Distance
10 ft.
25 ft.
10 ft. minimum
YEL
GRN
GRN
GRN
GRN
INCREASING SIGNAL STRENGTH
Signal Strength Bar Graph Displays
– 9 –
0.0 no signal
0.5
1.0
1.5
2.0 min
installation level
2.5
3.0
3.5
4.0
4.5
5.0 max signal
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