yagi antenna question

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yagi antenna question

Postby essexRXer » Sun Nov 20, 2016 11:35 am

Hi All,

I have seen that a homebrew antenna can be made where the radio itself is the diver, will this only work in lieu of two strips of metal when the *whole* radio is placed between the elements or will placing the rubber duck with coax connected to the radio further down still work?
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Re: yagi antenna question

Postby m0lsx » Sun Nov 20, 2016 12:25 pm

A yagi antenna is a type of antenna where there is a driven element, which is simply a centre fed dipole, with a Reflector behind it. Which makes it an HB-9. And then one or more directors in front of the driven element to make the beam narrow & more directional.
But a directional antenna does not need to be a Yagi or have multiple elements. A loop such as a Halo or a Moxon are also directional.
But a handheld radio is not capable of being used as a part of a directional antenna.
HOWEVER. A handheld radio can be used as a Direction Finding (DF) tool as the signal will null at both the top & bottom of the antenna, with the strongest null being at the base of the antenna. So holding the antenna horizontally rotate it, for the strongest null & the signal should be coming from that direction. This does work, but not as well as a multi element, directional antenna with a narrow field.
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