TM 55-1930-209-14&P-122.Rotate the squelch control fully counterclockwise.3.Set the channel selector switch to the desired channel.4.Rotate the squelch control clockwise until the background noise just disappears. This is the proper squelchsetting, and the control should not be rotated beyond this point or receiver sensitivity will be degraded.5.Set the desired hi/lo power setting. This switch should be in the "LO" position when conditions allow it. Use the"HI" position when you cannot make contact in the "LO" position or you are a considerable distance from thestation you are attempting to reach.NOTE: Selection of channel 15 (Horizon USA) or 17 (Horizon USA and Horizon Canada) automatically reduces the radiooutput power to one watt, in compliance with FCC and DOC regulations.6.When a message is received, adjust the volume control to the desired listening level.7.To transmit, depress the push-to-talk switch on the microphone and hold it in while you give your message.Speak slowly and distinctly. (Before transmitting, insure that the channel selected is not in use, as required byFCC regulations.)8.When you have finished transmitting your message, release the PTT switch so incoming messages can bereceived.NOTE: The transceiver cannot receive a call while transmitting. Therefore, wait until an incoming message is completedbefore transmitting.INSTALLATIONPRE-INSTALLATIONPrior to installation of the transceiver, its performance should be checked to insure optimum operation. In addition, FCCregulations require that the deviation and frequency of the radio be checked before the unit is placed in operation and atleast annually thereafter. Refer to the Performance Test section of the Maintenance chapter for complete performancecheck instructions. (If the transceiver does not meet the performance check requirements, proceed with the alignmentand troubleshooting procedures, also in the Maintenance chapter, until the requirements are met.)Consideration should be given to the following to determine the most ideal location for the transceiver.1.Keep in mind that cables from the antenna, power source and external speaker (if used) must be connected tothe radio unit.2.Do not locate the radio unit or external speaker close to the compass. Both the microphone and speaker containpermanent magnets which could result in erroneous compass readings.4
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