Table 13: Coaxial Cable Delay - RuggedCom RuggedRouter RX1000 Family Installation Manual

Dielectric Type
Solid Polyethylene (PE)
Foam Polyethylene (FE)
Foam Polystyrene (FS)
Air Space Polyethylene (ASP)
Solid Teflon (ST)
Air Space Teflon (AST)

Table 13: Coaxial Cable Delay

4.10.2.3 Lightning Considerations
Although it is not possible to protect the antenna from a direct lighting strike, the
antenna and connected components can be protected from secondary affects
through installation location and protection devices.
Install the antenna at least 15 meters away from and lower than any structures that
attract lightning. GPS antenna damage is usually not the result of a direct lightning
strike, but due to high currents induced by the effects of a lightning strike on a nearby
structure. RuggedCom also recommends installing lightning arrestors in the antenna
line to protect the receiver and connected devices. If a lightning arrestor is installed it
is important to ensure that it has a low impedance path to ground.
4.10.2.4 Line Amplification and Filtering
Although an active antenna has gain, depending on the length of the coaxial cable
used it may not be enough in which case a line amplifier will be required as well.
Most active antennas include filters; however, if there is a high potential for
electromagnetic interference, such as from the near field of a radio transmitter,
though the antenna system, additional antenna line filtering may be necessary.
®
RuggedRouter RX1000 Family
Time Delay
(ns/ft)
1.54
1.27
1.12
1.15-1.21
1.46
1.13-1.20
37
Communication Ports
Propagation
Velocity
(% of c)
65.9
80.0
91.0
84-88
69.4
85-90
®
RuggedCom - Rev.122