Where Does CB Signal Transmit From In Antenna?

[Richard]

Antenna is a GME 4705.

Richard

[9W6VX]

Richard,

Spot on.

Antennas are an animal by itself and can be a very technical subject when it comes to yagi or directional, number of elements etc etc.........

Cheers

Brendon

[Richard]

Does it radiat from the top of the antenna or the whole length?

Richard

[TOMUCH]

Mate, there are basicly two types of antennas, ground plane and ground plane independant. the first requires a large metal surface beneath it to radiate the transmission signal out, IE the center of your roof. As this is not practicable the other independant type is used. it does not require a graound plane to help withthe signal and can transmitt mounted on a bar. I am pretty sure (dont quote me) that the siganl radiates from the length of the antenna. I remember years ago have to have an antenna SWRd in, meaning the lenght had to be adjusted to optimise the signal strength. also HF type radios use a directional antenna to bounce their signal off the ionisphere (Spellcheck) to gain increadable distances. this is related to the length (compared to Freq) and angle of the antenna. If any comms tech savvy gurus out there can correct me, please feel free.. Cheers TOMUCH

[olcoolone]

All antennas are different, depends on the design.

There are a lot of thing they do in making an antenna do what they want it to do like phasing and loading, different dB gains can alters the angle of radiation making the antenna better for long or short communications.

[Richard]

No answer as yet.

Richard

[rodw]

My guess would be full length because the length of the antenna is designed based on the wavelength of the frequency being transmited and received. eg. you hear people talking about 1/4 wave length, 1/2 wave, full wave antennas etc. That's why wireless internet has such a short antenna, as it is a very short wavelength.

[Indy]

Have a look at this link Richard, it may help.

http://www.roity.com/rc/airwaves.html