Walkie-talkie (HX-500S VHF/FM marine handheld transceiver)
7.5 Vdc (+/-15 percent)
Transmit - 156.025 to 157.425 MHz
Receive - 156.050 to 157.425 MHz
RF power output
Low - 1 W
High - 5 W
Walkie-talkie battery charger (Model CSB50AM battery charger)
Input power requirement
Any 120/220/240 Vac, 50/60 Hz source
Power handling capability
Regulated power output
8.7 Vdc at 90 mA
5-6 Description of operation
5-6.1 General. Each radio has four main components: antenna, transceiver (radio) and speaker, regulated DC power
supply, and microphone. When power is turned on, the radio can be used for receiving or transmitting radio messages.
Receiving and transmitting radio messages are described in paragraphs 5-6.2 and 5-6.3.
5-6.2 Receiving radio messages. After radio is turned on, the antenna picks up incoming radio waves. These input
radio waves are then converted into sound (audio) output signals to produce words and sounds through the radio
5-6.3 Transmitting radio messages. After the radio is turned on and the microphone push-to-talk button is pressed,
words spoken into the microphone are converted into radio waves in the transceiver. The radio waves are then broadcast
from the antenna for reception by other radio stations.
5-7 Operating Instructions
5-7.1 Operating controls and indicators. Controls and indicators for radio communications system major components
are shown in Figures 5-6 thru 5-11.
5-7.2 Prestart procedures. The following prestart procedures should be performed by system operator before activating
radio communications system.
Perform before operation checks below as appropriate:
Make sure Army radio and marine radio installations are complete, connected to a power source
and electronically connected.
Make sure walkie-talkie battery pack is fully charged.
Use only clean water and a cloth to clean plastic surfaces. Do not paint plastic
surfaces. Damage to plastic will result if cleaned with solvent or painted.