Total posts : 45366
Taken from Earnest G Wilson’s Carrier Current Techniques.
Page 26 in the original print, page 29 on the PDF.
It begins like this:
Exciter: An exciter contains at least 4 DISTINCT circuit functions. These include the oscillator (and buffer), a radio frequency amplifier, and audio amplifier-modulator and a power supply. The output of the exciter is normally a low RF power. In all other respects, it functions as a transmitter.
Power Amplifier: A power amplifier increases the small amount of input RF power to a much larger output power. When used to amplify an already modulated AM signal it must do so without distortion. An amplifier that can faithfully reproduce its input signal while increasing power is said to be a “linear amplifier”
And for the BIG GONG…
Repeater: A repeater IS A LINEAR AMPLIFIER. It is designed to accept low power inputs which are already modulated and provide an increase in that power. It is used at the end of a long run of transmission line to boost signal levels up to a usable value.
And for the ultimate definition of the two separate devices combined as a whole.
Transmitter: An exciter can be used as a transmitter but usually provides a low output level. When FOLLOWED BY A LINEAR AMPLIFIER…the entire circuit becomes a transmitter with greater output power level. Monitoring meters are included to facilitate tuning and other adjustments.
Ahh….so there we are…out of the mouth of the babe himself…as well as countless other far more experienced engineers than anyone here today. That last paragraph I quoted is saying that unless all these things are combined, only then can the entire combination be called a transmitter as all the pieces are functioning as one. But without each individual component, to which DO have their own definition as to what they are..the entire mess becomes not only useless, but refines as to what EACH individual device IS.
Putting all the eggs into one basket is convenient. However convenience does not define nor has ever defined the established standards to what individual devices actually are or what they are defined as. It is much easier to say in one sentence “transmitter” than it is to name out all the individual components that make up the end device..ie transmitter. I rarely hear conversation where the combined device is segmented into its individual parts in said conversations. It all gets compressed down to the convenient single word…transmitter. But just because there is convenience, does not mean the convenience overrides the actual term and definition for each of the components that make up the whole.
A SET of equipment used to generate and transmit electromagnetic waves carrying messages or signals, esp. those of radio or television.
A person or thing that transmits something.
No where in that entire wikipedia page does it have the word “transmitter” in its describing the separate device, which in this case is an amplifier. Nor does the referenced publication by Jerry Whitaker “The RF Transmission Handbook” refers to an amplifier being a transmitter.