Does a long wire antenna have to be straight?
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Does a long wire antenna have to be straight?
The wire may be straight or it may be strung back and forth between trees or walls just to get enough wire into the air. Due to the great variability of the (unplanned) antenna structure, effectiveness can vary wildly from one installation to another.
How thick should antenna wire be?
As a general rule of thumb, 16 gauge is sufficient up to 100 watts, but 12 would be ideal. Any system exceeding 100 watts really needs to have the actual current and skin effect calculated, and that is dependent on frequency and also somewhat on antenna type.
Is stainless steel wire good for antennas?
stainless is not recommended for a “low impedance” antenna (such as a simple dipole). However, it would be OK for an antenna with a higher RF impedance than a single dipole (e.g. 300 ohm or greater antenna, (e.g. folded dipole etc.))
What is the best wire to use for an antenna?
With braided copper cable the electrical HF conduction is fine It is strongly recommended to use insulated antenna wire at all times. When the cable will be used uninsulated, it will work well in the beginning. Over time, the cable will corrode, affecting the outside of the conductor.
What makes an antenna high gain?
High-gain antennas are focused antennas with narrow radio beams, allowing for precise targeting of radio signals. This antenna is used in space missions as well as in flat, open areas where the geography won’tdisrupt radio waves.
Why is antenna gain measured in dB?
dB is antenna gain in decibels reference to how much times gainincrease there is with respect to 1(0dB) . dBi is antenna gain with respect to isotropic antenna. Since isotropic antenna has gain 1 ( 0 dB) thats why here dB and dBi are same. Gain of 3 dB means 2 times increase in gain.
What affects antenna gain?
As a practical matter, the maximum directive gain (directivity) of an antenna depends upon its physical size compared to wavelength. The uniformly illuminated aperture type of antenna has been found to give a higher gain in practice than other antennas, at least for large apertures.
