Davis Instruments Radio Surge Protector, 7681, 7863 User Manual
Product # 7861 & 7863
R
ADIO
S
URGE
P
ROTECTOR
F
OR CELLULAR TELEPHONE MODEM
,
S
PREAD-SPECTRUM RADIO
M
ODEM
,
AND
UHF R
ADIO
M
ODEM
The Radio Surge Protector provides surge protection between any antenna
cable with BNC connector and the UHF radio modem (UHF-RM), spread-spectrum radio modem (SS-RM), or cellular telephone modem (CTM). The use of
the Radio Surge Protector is essential if the UHF-RM, SS-RM, or CTM is being
used in an area where lightning induced surges are a possibility.
Note: Davis recommends the use of the Radio Surge Protector for all wireless installations.
C
OMPONENTS
The Radio Surge Protector comes with the following components. Please make
sure you have all listed components before continuing.
Radio
Surge
Protector
Ground Lug
Aluminum
Spacer
#10-32 x 1"
Machine Screw
Internal Tooth
Lock Washers
#10-32
Hex Nut
12" BNC Connector Cable
Included with #7863 (Radio
Surge Protector for Spread-Spectrum
and UHF) only
Ground Wire
Page 2 Radio Surge Protector
I
NSTALLING
IN
C
OMPLETE
S
YSTEM
S
HELTER
Follow the instructions below to install the Radio Surge Protector (referred to
as the protector) in the Complete System Shelter (CSS).
1. Using a 7/32" drill bit, drill a hole in the CSS in the location shown below.
2. Install the protector and ground lug as shown below, using the #10-32 x 1" (25 mm)
machine screw and the tooth lock washers and #10 hex nut from the mounting hardware kit supplied with the protector.
Note: Do not use the spacer when installing in the CSS.
3. Insert one end of the ground wire into the ground lug and tighten.
The use of a heavier ground wire or strap is recommended if nearby lightning strikes are likely.
4. Attach the other end of the ground wire to a suitable earth ground.
5. Connect the cable coming from the antenna to the ANTENNA side of the protector and
the cable from the modem to the EQUIPMENT side of the protector.
Consult the manual supplied with your installation kit for exact cabling
instructions.
User-Drilled Hole
7/32" Diameter
(.218", 5.5 mm)
Machine
Screw
Lock
Washer
Lock
Washer
Hex Nut
Radio
Surge
Protector
6.0" (152 mm)
2.0" (51 mm)
Ground Lug
Ground
Wire
Note: Aluminum Spacer not used.
Centerline
of Shelter
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