Furuno FS-1562-15, FS-1562-25 manual Transmitting, Tuning the antenna, Using the handset

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1.6 Transmitting

After selecting class of emission and frequency, you can transmit by pressing the PTT (press-to-talk) switch on the handset or microphone. Output power can be evaluated on the operation display.

Do not transmit any signal other than emergency during the silence period, 00 to 03 min and 30 to 33 min of every hour.

Tuning the antenna:

Maximum transmission power is achieved only when the antenna impedance and transmitter impedance match each other. Because the antenna impedance changes with frequency a means must be provided to match (tune) the antenna impedance with the transmitter impedance. This is done with the antenna coupler. The antenna coupler automatically tunes the transmitter to a wide range of different antenna length (7 - 30 m). To initiate the automatic tuning, do the following:

•Press the PTT switch on the handset (microphone); or

•Press [7] TX TUNE key.

After one of the above is done;

1.“TUNE” appears on the display.

2.Tuning will be completed within 2 to 5 seconds for a newly selected frequency, or less than 0.5 seconds for a once tuned frequency. (A built-in memory remembers coil and capacitor settings.)

3.When the tuning process is successfully completed “OK” appears.

Using the handset:

Hold the handset close to your mouth, press the PTT switch and speak clearly.

Monitoring transceiver output power:

During transmission, the meter deflects depending on the current being fed to the antenna feeder from the ATU. The unit of readout is amperes. The antenna current varies with the effective antenna impedance. The swing differs by the frequency or antenna length. The output power is proportional to the square of an antenna current. But don’t be very nervous about the meter swing.

0 1 2 3 4 5 ANT

J3E

-1.10-

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Contents Page T 9 9 Safety Instructions Do not disassemble or modify the equipment List of Contents Features IntroductionSpecifications of MF/HF Radiotelephone model FS-1562 GeneralReceiver Operation Front View of Transceiver Unit Rotary controlsKeys Page Power Supply Unit AC and DC power switchesFuses Starting operation Selecting FrequencyTX Freq Standard type Netherlands type Special type YESDirect frequency entry J3ECustom channels ITU telephony channels SSBITU Telex channels Monitoring transceiver output power Tuning the antennaUsing the handset TransmittingReducing transmitter power Distress Call on 2182 kHzDistress frequencies Distress calls and Distress messageEvent of Antenna Coupler Failure DSC Distress CallingReceiving Noise blanker NB Frequency ScanSquelch control Channel scanFrequency Sweep ITU channelsOptional Devices Telex CommunicationIntercom Remote StationSetting Page Page This page is intentionally left blank Diagnostic Test Testing the transmitter with a dummy antennaWeekly Checks Page LCD/Keyboard Test & ROM Version No. Confirmation Antenna Coupler Test Competent technicians onlyMaintenance Page Troubleshooting Troubleshooting List For qualified personnel onlyTrouble Probable Cause Remedy Error Indication Replacing FusesThis page is intentionally left blank Appendix MF band working carrier frequencies ref. US CFR 47 Part MF band SSB working carrier frequencies CH noMHz ITU SSB carrier frequencies ITU RR Appendix Following frequencies are factory programmedAP.5 12/16 MHz ITU SSB carrier frequencies ITU RR Appendix AP.7 Telex Channels MF Band Telex Frequency TableMHz Band ITU Nbdp Telex Frequency Table ITU RR AppendixAP.10 AP.11 12/16 MHz Band ITU Nbdp Telex Frequency Table AP.13 18/19 MHz Band ITU Nbdp Telex Frequency Table AP.15 22, 25/26 MHz Band ITU Nbdp Telex Frequency Table
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