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The exciter is really a very small transmitter. It produces the exact kind of signal that the transmitter makes, except that its power is too low to be of much use. In the transmitter there is an amplifier that boosts this low power to a high level so that it can reach farther.

A classical design example is an FM transmitter. A small exciter cabinet contains an audio input section, and RF oscillator and modulator, and a small power amplifier of perhaps 10 watts, and a small power supply to run these things. This is the exciter. The audio feed is sent into the exciter and an FM signal comes out. If you were close to the exciter with your receiver, and the exciter were connected directly to the radio antenna, you could listen to the station just fine.

But 10 watts will only go a few miles. To cover a small town, you might need 1000 to 10,000 watts, or for a large city, you could use 100,000 watts.

The transmitter therefore includes, besides the exciter cabinet, a much larger cabinet, or set of cabinets, containing a substantial power supply and amplifier to boost the exciter's power output to the proper level. It is this high-power output that is fed to the antenna.

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