Figure 1-3.—High-frequency receive system.Figure l-3 shows atypical high-frequency receivesystem. Refer to the figure as we follow the signal paththrough the system.1.2.3.4.5.6.A transmitted high-frequency signal is receivedby the antenna, which converts electromagneticenergy to electrical energy.The signal travels through a transmission line toan antenna patch panel, where it can bedistributed to any of a number of receivers.The receiver converts the RF signal into ateleprinter or voice signal, depending upon whatis desired.The output of the receiver is then sent to thereceiver transfer switchboard.If a teleprinter signal was selected, theteleprinter signal from the switchboard goes tothe AN/UCC-1 and then follows the same pathas we described in the low-frequency receivesection. Identical pieces of equipment are used,and they perform the same functions.If a voice signal was selected, the voice signalfrom the receiver transfer switchboard is sent tothe radio set control. The output is then sent to ahandset. The voice signal can also be sent fromthe switchboard to a remote speaker amplifier.There, it can be placed on a speaker so that the1-4user can listen to the received signal withoutholding onto the handset.VERY-HIGH-FREQUENCY SYSTEMSThe very-high-frequency (VHF) band (30-300MHz) is used for aeronautical radio navigation andcommunications, radar, amateur radio, and mobilecommunications (such as for boat crews and landingparties). Figure 1-4 shows a basic block diagram of aFigure 1-4.—Very-high-frequency transmit and receivesystem.
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