Appendix C: Grounding and RF protection
TT-98-129218-A
RF interference
68
RF interference
Interference induced from nearby RF transmitters might cause system failures and in extreme
cases permanent damage to the SAILOR FleetBroadband equipment. If there are problems with
interference from HF transmitters, it is advisable to mount ferrite clamps on the coax cable in order
to provide suppression of induced RF. The ferrites will have no effect on the differential-mode
signals but increases the impedance in relation to common-mode RFI.
Recommendations
Use 1-5 pcs. hinged clamp cores (e.g. the RFC or SFC series from Kitagawa) mounted on the
antenna cable near the antenna.
Electrostatic Discharge
In addition to the RFI attenuation, mounting ferrite clamps on the antenna cable will also slow the
fast rate-of-rise of an electrostatic discharge current pulse. This might be an issue during
installation (antenna cable disconnected) where different electrical potentials have had the
chance to build up between the terminal and antenna.
We recommend mounting 1-5 pcs. hinged clamp cores (e.g. the RFC or SFC series from Kitagawa)
on the antenna cable near the antenna.
