Co-phased collinear for 2m – discussion of phasing devices

An exploration of a cophased collinear array with coax phasing stubs explored various structures for encouraging co-phase operation of a 3/4λ vertical over perfectly conducting earth (PCE). This article expands that set with NEC-4.2 models of some variations on the traditional Franklin form of the antenna. Let’s start with review of the traditional Franklin form … Continue reading Co-phased collinear for 2m – discussion of phasing devices

Franklin antenna – how does it work?

(Franklin 1924) described a technique to cophase sections of a long antenna by “concentrating alternating half wave length portions of the wire within a small space, by winding such portions as inductance coils or by doubling such portions back on themselves so that there is practically no radiation from these portions”. Let’s explore his second … Continue reading Franklin antenna – how does it work?