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How collinear antenna works?
In telecommunications, when two or more dipole antennas are vertically stacked in such a way that their corresponding elements are parallel and collinear with each other, it is called a collinear antenna array. The antennas are linked in such a way that the radiating dipoles sum up all radiation intensities.
What is the most common type of antenna for VHF?
vertical whip
The most common type of GMDSS VHF antenna is a vertical whip. Longwire antennas are normally used for HF. VHF communications are normally vertically polarized so horizontally-polarized antennas should not be used. What is the purpose of the antenna tuner?
What is meant by collinear array?
A Collinear array consists of two or more half-wave dipoles, which are placed end to end. These antennas are placed on a common line or axis, being parallel or collinear. The maximum radiation in these arrays is broad side and perpendicular to the line of array.
What is an advantage of a collinear antenna?
Collinear array The main purpose of this array is to increase the power radiated and to provide high directional beam by avoiding power loss in other directions. Advantages of collinear array antennas include increasing directivity with a reduction in power losses.
What are the reasons for using antenna array?
Arrays can be used to achieve higher gain, to give path diversity (also called MIMO) which increases communication reliability, to cancel interference from specific directions, to steer the radio beam electronically to point in different directions, and for radio direction finding (RDF).
What kind of antenna is a collinear antenna?
Home-brew Compact 6dBi Collinear Antenna – This page details the construction of an easy-to-make collinear 360 degrees omni-directional, vertically polarised, antenna for 802.11b/g wireless networking. Omni-Gain Vertical Collinear Antenna – This rugged antenna, an omnidirectional collinear, is capable of surviving harsh environments.
When did the omnidirectional collinear antenna come out?
The original version of this article appeared in the August 1990 issue of “73” Amateur Radio Magazine. It is reproduced here with permission. This rugged antenna, an omnidirectional collinear, is capable of surviving harsh environments. It’s a good choice for repeater installations and can be top, or side mounted to the tower.
When to adjust decoupling sleeve on vertical collinear antenna?
If the SWR is over 1.5:1 you can adjust the decoupling sleeve slightly up or down for the best reading. If you have designed the antenna for downtilt you can check it by observing the signal strength of a nearby repeater.
How did Karl Shoemaker build the collinear antenna?
Using a sharp cutting tool or tubing cutter, cut 5/8″ of tined braiding off each section end. Cut 1/2″ of insulation from center conductor, leaving 1/8″ between center conductor and braiding. After soldering all sections and balun stub together, check the return loss.