Typically a transmitter design includes generation of a carrier signal, which is normally sinusoidal, optionally one or more frequency multiplication stages, a modulator, a power amplifier, and a filter and matching network to connect to an antenna.
32.
These passive ( and active ) impedance-matching devices are optimized for different applications and include baluns, antenna tuners ( sometimes called ATUs or roller-coasters, because of their appearance ), acoustic horns, matching networks, and terminators.
33.
The cause of these losses is related to the relatively low radiation resistance of an electrically short radiator with respect to the r-f resistance of the ground system and matching networks, all of which are in series with the antenna current.
34.
There are no matching network buildings at the bottom of the masts used for medium wave transmission & ndash; the devices for tuning the masts to the transmission line are placed in the open air, similar to those in the longwave antenna system.
35.
A typical phasor has separate controls to adjust the phase of the current going to each tower, adjustable power divider controls, and a common point impedance matching network to adjust the system input impedance to 50 ohms with no reactance without disturbing the phase or amplitude of the tower currents.
36.
Matching is a much more critical requirement at RF than it is at voice frequencies, so when cable started to become available that was truly 50 ? a need arose for matching circuits to interface between the new cables and legacy equipment, such as the rather strange 51.5 ? to 50 ? matching network.
37.
Along with transceivers and separates, the 4-Line included a set of matching accessories including the L-4 linear amplifier, C-4 control console, W-4 and WV-4 power meters, transmit and receive converters for the 50 MHz ( 6 meter ) and 144 MHz ( 2 meter ) bands, and antenna impedance matching networks ( tuners ), the MN-4 and MN-2000.
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