NOTE: All radio direction finding (RDF) antennas have a frequency range in which they work efficiently and accurately. Above or below that range of frequencies, they lose efficiency and accuracy; the elements need to be changed both in separation from each other as well as length. The WiNRADiO RDF array works best if the highest and lowest frequencies are not more than 2.5:1. For example, if the highest frequency is 250 MHz, then the lowest frequency would be 100 MHz (that's a 2.5:1 ratio). Thus, if coverage is 100-500 MHz, then two arrays: the first for 100-250 MHz (that's a 2.5:1 ratio), the next for 250-500 MHz (which would actually work fine to 625 MHz since 250-625 is a also the desired maximum 2.5:1 ratio)..
The
AX-55D direction finding antenna system represents a direction finding solution
for frequencies between 50 and 1000 MHz. This frequency range is expandable down
to 20 MHz (option AX-55D-20).
The AX-55D antenna is supplied in an easy to assemble modular kit form, making
it possible to use the antenna in different configurations, optimized for the
frequency range of interest, and tailored to common application scenarios, in
both stationary and mobile environments. Such high modularity and flexibility is
not very common with DF antennas, and this is what makes the AX-55D antenna so
unique. In fact, the AX-55D represents six antennas in one (three
stationary and three mobile ones).
With the AX-55D-20 low-frequency option, yet another configuration is available,
which makes it possible to operate in the low-VHF range, down to the high HF
bands.
The AX-55D antenna is lightweight
and portable. It is designed for fast hand-assembly and disassembly without the
need of any specialized tools. All parts of the antenna fit into an
inconspicuous carry bag (supplied with the antenna) which can be easily carried
by one person. One person can easily assemble and disassemble the entire antenna
within minutes.
The AX-55D direction finding antenna system is ideally suited for applications
in both military and civilian environments, where simplicity of operation,
portability, flexibility and ease of deployment are required.
The complete kit includes an Antenna Control Unit, compatible with WiNRADiO WD-3000 Direction Finding Receiver. Together with this receiver, this system represents a universal, reliable direction finding solution suitable for many demanding applications.
The AX-55D antenna is designed as a
fast-deployable field unit, i.e. it is made of modules which can be quickly
assembled and disassembled in the field. It is not designed to be permanently
fixed on a mast and exposed to elements.
The standard cable lengths are 15ft (5m).
http://www.winradio.com/pdf/ax55d-man.pdf
