3-4
transmitter transfer switchboards when more than six transmitters are installed in the system. When the
rotary switch is placed in the OFF position the remote control station is removed from the system.
Let's look at an example of one transfer switchboard application. When remote control station
number two is to have control of transmitter number three, the switch knob designated number two is
rotated until its pointer indicates position three on its dial plate.
The receiver transfer switchboard permits the operator to transfer the audio output from a receiver to
a remote control station audio circuit. A representative receiver transfer switchboard is shown in figure 3-
4. This switchboard contains ten seven-position switches. Each switch is connected to a remote control
station, and each switch position (one through five) is connected to a receiver.
Figure 3-4.—Receiver transfer switchboard.
The X position on each switch allows transfer of circuits to additional switchboards just like with the
transmitter transfer switchboard.
Q1. What are the basic functions of a handset?
Q2. What capability does a transmitter transfer switchboard provide?
Q3. What function does a receiver transfer switchboard perform?
TRANSMITTERS
You learned earlier that transmitters may be simple with low power (milliwatts) capabilities. These
may be used to send voice messages a short distance. You may also use highly sophisticated units that use
thousands (even millions) of watts of power to send many channels of data (for example voice,
teletypewriter, television, telemetry) simultaneously over long distances. Let's look at a complete
transmitter set.
