2
Hi-Z 8A Element Man. 3.0
© 2011 Hi-
Z Antennas™
www.hizantennas.com
8125
Hi-Z 8A Phase Controller
1 – Hi-Z 8 direction Shack Switch
8 – Hi-Z Amp PLUS or PLUS6
1 – Hi-Z 75Ω In-line Pre-amp PLUS
1 – Hi-Z 75Ω to 50Ω Transformer
1 – 2 foot long RG6 cables (to inserted the Pre-amp)
1 – 2 foot long wire with terminals (power to Inline pre-amp)
Options
BCB Filter
HPF
At the end of this manual there is a chart of measurements to layout your array.
Material That the Customer Supplies –
1.
Control cable (7 conductor –5 wires for control and 2 for power)
2.
Short two conductor cable for DC power. Hi-Z supplies the connector for the shack switch.
3.
http://www.hizantennas.com/hiz_verticals.htm
4.
8 short ground rods. Depending on soil type, in the range of 2 –3 feet long.
5.
RG6 coax and connectors (connecting the verticals to the phase controller and from phase controller / in-line
pre-amp to shack receiver location). RG6 coax is more than adequate to lengths out to 1000 feet long.
6.
Make 16 9-10” long wires. Wire size can be made from 18 – 20 gauge wire. Terminate each end with #6 ring
terminals. Recommend that after the terminals are crimped, that these terminals are soldered for reliability.
For Hi-Z Amp terminations.
7.
Weatherproofing the electronics
. You will need an adequate cover or enclosure that will keep rain and snow
off the phase controller, in-line pre-amp and filters if installed, and the Hi-Z Amps at the base of each vertical.
Water getting inside of these enclosures WILL cause DAMAGE.
The Hi-Z Antennas 8 elements receiving system utilizing shortened vertical elements has been designed to provide
a high-performance receiving antenna for the Amateur low bands covering 160 or 80 meters. The unique
advantage of the 8-element system is that it can be switched electrically to provide receiving capability in eight
different directions. This system is also somewhat unique in that it uses high-impedance amplifiers at each antenna
to extract the signals. Using these amplifiers negates the need for an extensive ground radial system around each
antenna element in most areas with decent (1-2 foot deep dirt, not rock) ground conditions. This system can be
used in place of the well-known Beverage receiving antennas that use very long wire elements and only provide
one or two receiving directions per wire. This system can also be used in place of various types of receiving loops
and arrays of multiple loops. This system when well built will outperform most all other low-band receiving antenna
types.
See the antenna comparison chart here:
http://www.hizantennas.com/comparison.pdf
What Can be Achieved With the Narrow 8 Circle Array
Most receiving systems being compared against another are most often compared for their front to back response
ratio and their directivity. Front to back ratio is generally expressed in dB and then directivity, Relative Directivity
Factor (RDF) in dB as well. There have been many spacing layout dimensions evaluated in order to get maximum
performance from these arrays. The results of this evaluation has shown that for an emphasis on 160 meter band
operation the circle dimension 200 feet diameter will give great performance on 160 meters. The same
performance on 80 meters requires only a 100-foot diameter. The following plots are based on a 160 meter band
diameter of 200 feet and they show the resulting performance characteristics. The phasing delay cable values
required in the 8 circle controller has been chosen for optimum performance. .
Basic Narrow 8 Circle Element Physical Layout
