Samsung 4G LTE Network Extender 2 User Manual page 69

Avoiding Interferences
If more than one antenna for other communications, such as an antenna for a base
station or satellite communication, is installed in the surroundings, the GPS
antenna must be installed in a location to which no interference signals flow in.
If interference exists within the GPS L1 frequency bandwidths (1575.42 ± 1
MHz), you should use a band pass filter to prevent them from affecting it.
Furthermore, if the GPS antenna is installed by a transmitter which operates with a
bandwidth similar to the GPS L1 frequency, the possibility of interference
increases (in this case, interference is caused by harmonics). If the GPS antenna
has a problem due to interference, you must move it to a different location where
interference signals can be avoided or minimized in strength.
Inband Noise
Inband noise includes narrow band noise and wide band noise that occur in an
inband width. (L1, 1575.42 ± 1 MHz)
- Narrow band noise in an inband width: If it is higher than 108dBm, it can affect
the operation of the GPS receiver.
- Wideband noise in an inband width: It may not be detected by a measuring
instrument and impair the sensitivity of the GPS receiver, and thus affect its
operation.
If there is an outband interference problem, you can reduce the effects of
interference on the GPS receiver by applying one or more L1 GPS band pass
filters.
The filter should be installed at the following locations:
•
•
The filters above are used to reject jamming tones for outband signals. If
interferences actually occur in the inband signals, they will result in serious
consequences.
Verizon 4G LTE Network Extender 2 User Guide v1.1
Copyright © 2017, All Rights Reserved.
The input connector of the Samsung GPS receiver
Behind the antenna or the front end of a line amplifier
Appendix A Outdoor GPS Antenna Installation
61