Commercial Antennas

Contents
  1. A Little Antenna Theory
  2. RFI BA80-67
  3. RFI OA20-41 VHF Antenna
  4. Diamond X6000A Triband Base Antenna
  5. Diamond VX1000 50/144/430mhz VHF UHF 6m 2m 70cm
  6. Diamond D-130J Super Discone Antenna
  7. The Southern Cross Tower with Antennas Layout
  8. References

A Little Antenna Theory

Horizontal Dipole (Eg Horizontal Yagi):
E and H Plane_horizontal - yagi.png

Diagram showing the relationship between the E and H planes for a horizontally polarized directional yagi antenna.
In this case E-Plane is Horizontal and the H-Plane is Vertical.


Vertical Dipole (Eg Vertical Pole):
E and H Plane - vertical

Diagram showing the relationship between the E and H planes for a vertically polarized omnidirectional dipole antenna.
In this case E-Plane is Vertical and the H-Plane is Horizontal.

Source: https://en.wikipedia.org/wiki/E-plane_and_H-plane https://en.wikipedia.org/wiki/Radiation_pattern

Some pratical Notes:



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RFI BA80-67

UHF Omnidirectional Dipole Arrays330-520 MHzBinary Array Series
Image Image

The BA80-67 arrays utilise an internal phasing harness in PTFE based double screened coaxial cable with polyethylene jacket to aid waterproofing and resist bird attack. The use of a unique phasing arrangement provides extensive side lobe suppression and null fill characteristics. The arrays will accept an input power level of 500 watts continuous, making them ideal for high power multiple transmitter applications. The BA80 series are offered with 3°, 5° or 8° downtilt, to further enhance close-in coverage characteristics.

All welded alodined aluminium construction and new fabrication techniques in both the harness and dipole sections have proven to minimise intermodulation and noise generated within the antennas. The entire array rests at ground potential and offers the ultimate in lightning resistant antennas.

Source:https://www.rfiwireless.com.au/base-antennas/dipole-array/uhf-binary-dipole-array-ba80-67.html
and:https://www.rfiamericas.com/wp-content/uploads/2018/01/40945-2_ba-series_uhf.pdf

ba80-67 radiation pattern

What is the purpose of alodine?

It is primarily used as a corrosion inhibitor, primer, decorative finish, or to retain electrical conductivity. The process is named after the chromate found in chromic acid, also known as hexavalent chromium, the chemical most widely used in the immersion bath process whereby the coating is applied.
Source: https://en.m.wikipedia.org/wiki/Chromate_conversion_coating

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RFI OA20-41 VHF Antenna

VHF Offset Dipole Arrays 136-174 MHz OFFSET ARRAY SERIES
RFI OA20-41 VHF Antenna https://www.rfiwireless.com.au/base-antennas/dipole-array/vhf-dipole-array/vhf-offset-dipole-arrays-oa20-41.html

https://www.rfiwireless.com.au/media/downloads/pdfs/oa20_oa40.pdf

oa20-41 E radiation pattern

oa20-41 H radiation pattern

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Diamond X6000A Triband Base Antenna

Diamond X6000A Triband Base Antenna
Features: Specifications: Source: https://www.diamondantenna.net/x6000a.html
x6000's 145MHz radiation pattern:
x6000's 145MHz radiation pattern
x6000's 145MHz radiation pattern:
x6000's 435MHz radiation pattern
x6000's 1280Mhz radiation pattern:
x6000's 1280Mhz radiation pattern

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Diamond VX1000 50/144/430mhz VHF UHF 6m 2m 70cm

Diamond VX1000 50/144/430mhz VHF UHF 6m 2m 70cm

Diamond VX1000 50/144/430MHz(6m/2m/70cm) is made of fibre glass construction, pre-tuned and fully weatherproofed. No radials are required. Mast mounting brackets are included.



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Diamond D-130J Super Discone Antenna

Diamond D-130J Super Discone Antenna

The D-130J Super Discone Antenna is an ultra-wideband antenna covering amateur radio, commercial 2-way, cellular, air traffic control and various utility frequency bands. Rust-free stainless steel is employed in major component parts making the antenna rust resistant and durable.

Special Features:

Specifications: Source: https://www.diamondantenna.net/d130j.html

A discone antenna is a version of a biconical antenna in which one of the cones is replaced by a disc. It is usually mounted vertically, with the disc at the top and the cone beneath. Omnidirectional, vertically polarized and with gain similar to a dipole, it is exceptionally wideband, offering a frequency range ratio of up to approximately 10:1. The radiation pattern in the vertical plane is quite narrow, making its sensitivity highest in the direction of the horizon and rather less for signals coming from relatively close by.
Source: https://en.wikipedia.org/wiki/Discone_antenna
The Discone Assembly Instructions:

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The Southern Cross Tower with Antennas Layout


Southern Cross Tower with Antennas

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Example Antennas

Antennas-2018-08-03-16.42.29 Antennas-2018-08-03-16.42.45 Antennas-2018-08-03-16.42.48 Antennas-2018-08-03-16.42.51 Antennas-2018-08-03-16.42.59 Antennas-2018-08-03-16.43.16

References

Diamond Antenna Product Catalogue: https://www.diamondantenna.net/pdfdocs/2017DiamondCatalog.pdf

Notes on HF Discone Antennas L. B. Cebik, W4RNL
http://mirror.thelifeofkenneth.com/lib/electronics_archive/NotesOnHfDisconeAntennas.pdf

Discone Antenna Design - Written by Bill Pretty Highpoint Security Technologies
www.hipoint.ca/whitepapers/WhitePaper_DisconeAntenna.pdf

All About the Discone Antenna: Antenna of Mysterious Origin and Superb BroadbandPerformanceSteve Stearns, K6OIK
www.fars.k6ya.org/docs/All_About_the_Discone_Antenna,_QEX,_Jan-Feb-2007.pdf

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20190328 - pre published v0.9