What is the purpose of a transmitter?

In the Telecommunications world, a Transmitter is a device that produces radio waves radiating from an antenna. In the world of process control, a Transmitter is a device that converts the signal produced by a sensor into a standard instrumentation signal representing a process variable being measured and controlled.

What is the difference between transmitter and antenna?

A transmitter is a different kind of antenna that does the opposite job to a receiver: it turns electrical signals into radio waves so they can travel sometimes thousands of kilometers around the Earth or even into space and back. Antennas and transmitters are the key to virtually all forms of modern telecommunication.

How does frequency transmitter work?

The transmitter combines the information signal to be carried with the radio frequency signal which generates the radio waves, which is called the carrier signal. The radio signal from the transmitter is applied to the antenna, which radiates the energy as radio waves.

Do you need an antenna for an FM transmitter?

Yes because the impedance of the output of the radio has to match the antenna. It is not necessary to have an antenna for the receiver but it will work much better if it did.

Can a transmitting antenna also be used as a receiving antenna?

You can use the same antenna, even when transmit and receive are at identical frequencies. This has been done for simple short range Doppler radar where the transmit signal breakthrough is used an the reference signal to drive the homodyne receiver mixer.

What is the purpose of transmitting antenna?

TV and radio broadcasting stations, use transmission antennas to transmit specific types of signals that propagate through the air. These signals are detected by receiving antennas which convert them into signals, and are received by the appropriate device (e.g., TV, radio, mobile phone).

Can an antenna tuner be used to fix an antenna?

Most amateur transmitters require a 50 Z load. Impedance changes with frequency. An antenna tuner will not “fix” an inherently flawed antenna. It will only create an acceptable impedance load for the transmitter. Manual tuners with variable capacitors and inductors can be adjusted to an exact match.

How is impedance matching achieved in an antenna tuner?

Impedance matching is achieved in the antenna tuner by presenting a complex conjugate impedance match at Point C. Essentially, the tuner is canceling out the reactive component of the complex impedance presented to it by the mismatched antenna system by presenting it with a reactive component of equal value, but opposite sign.

What are the disadvantages of automatic antenna tuners?

The main disadvantage of automatic tuners is that there is a finite combination of possible settings. On a severely mismatched antenna system, your antenna tuner may have difficulty finding the 50 ohm sweet spot. Antenna tuners built into many popular radios are well known for this shortcoming.

Why won’t my antenna tuner pull the SWR down?

Antenna tuners built into many popular radios are well known for this shortcoming. If the integrated automatic antenna tuner on your radio clicks and clicks but won’t pull the SWR down as far as you hoped, it’s because built in antenna tuners are only there to make minor tweaks.