OPTION DESCRIPTIONS
Environment: -40
o
C to +85
o
C
Sealing: Waterproof IP66 Standard (Mil, etc.)
Bypass Voltage: 6 Volt Max. with Gas Insert.
Bypass Current: 1 Amp
DC Resistance : < 1 Ω
Length: 4.53 Inches
Width: 1.36 Inches.
Depth: 2.6 Inches Not Including Type N Connectors.
1.3 LIGHTNING ARRESTOR INSTALLATION
The following installation procedure balances the voltage potential thus preventing inductive
interference to parallel signal lines within the protected area.
• Mount the Lightning Arrestor on a metal mounting plate or bar (customer furnished) with a
thickness not to exceed 0.33 inches. See Figure One.
• The Lightning Arrestor should be mounted so that the mounting plate and the Lightning
Arrestor are outside of the enclosure where the GPS unit is housed.
• The Lightning Arrestor should be placed on the unprotected side.
• The connection between the mounting plate and the ground terminal should be accomplished
with a low resistance path such as a copper strap (customer furnished).
• The contact surface of the mounting plate must be conductive (free of any paint, anodization
or oxides). Tighten the mounting nut to reduce the contact resistance between the arrestor
body and the mounting plate.
• Connect an AWG 5 or larger wire between the ground terminal on the mounting plate to a
good earth ground. Remove the gas capsule arrestor access cover and insert the gas arrestor
capsule into the lightning arrestor body and tighten the capsule holder to a minimum torque
of 4.43 foot pounds.
• When connecting the cable from the antenna to the Lightning Arrestor, install a drip loop
before it enters the arrestor. This keeps any large amounts of moisture from coming down
the cable and collecting at the connector, causing a loss and/or failure.
Symmetricom Inc ET6xxx ExacTime GPS TC & FG (Rev C) C-49
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