An Introduction to Radio Direction Finding

By Eugene Botha and Kalinka Faul Humans do audio direction finding to a remarkable precision of less than two degrees.  Shortly after the development of radio transmitters and receivers, radio direction finding (RDF or just DF) evolved for much the same reasons as human audio direction finding: firstly, for the location of possible threats and…

High-Gain Omni Antennas in Mobile Applications

By Johan Fuhri Antenna Principles High-Gain Omni-directional antennas are used in situations where the direction of the receiving antenna is not static or known.  A typical situation is where antennas are mounted on a mobile platform like a vehicle or vessel. In any communication system, the quality and throughput that can be attained through a…

Spacing Considerations of Multiple LPDAs on a Mast

Written by Johan Fuhri Introduction One of the questions we often get asked at Alaris Antennas, is the question of spacing between multiple antennas on the same mast. Often, this question is related to situations where the space on the mast is limited (mobile or tactical application) and where high-power transmitters are involved.    Unfortunately, there are no…