Question about transmitter antennas

[obrien136]

Hello,

I am trying to purchse an antenna for a 27MHz transmitter that I am building to be used for radio controlled vehicle. Does it have to have 2 inputs or can a telescopic antenna be connected to one sideof the transmitter output?

George

 

[jiripolivka]

A typical 27 MHz transmitter has a coaxial output connector to which you connect a whip antenna. The connector is used to test the transmitter before the antenna is connected.

Various RF devices may be designed with a symmetrical (two-prong) output or input, most have the unsymmetrical (coaxial) input and output. The coaxial ports are typically specified with the impedance of 50 Ohms most test equipment have.
The best conditions to transmit power from a source (transmitter) to a load (antenna) require power matching, or, that both sides have 50 Ohms impedance.

 

[obrien136]

In the case of a rc car controller, would it also be coax?

 

[jiripolivka]

In the case of a rc car controller, would it also be coax?

Yes, the whip antenna you will purchase has a coax connector.

 

[chuckey]

RC transmitters use a monopole, i.e. a single aerial rod. The "earth" connection is done by the case and the operator. So just buy a whip and attach it.
Frank