User manual GARMIN VHF 725

[. . . ] VHF 725 submersible marine radio owner's manual and reference guide © 1999 GARMIN Corporation GARMIN International, Inc. 1200 E 151st Street, Olathe, Kansas 66062 USA Tel. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ UK Tel. 1, Lane 45 Pao Hsing Road, , Hsin Tien, Taipei, Taiwan, R. O. C. [. . . ] (Figure 4) The unit was set at the factory to channel 10 before shipment. Press the UP or DOWN arrow key to scroll through the channels available on the selected band. (Figure 4) If you dont know which channel to select, refer to the Channel List in Appendix C on pages 28 and 29. Selected Channel Band Select Channel Select FIGURE 4 16 NOTE: You will notice an A indicator adjacent to some channel numbers in the USA and Canadian bands. These are simplex channels (transmitting and receiving on the same frequency) while the International counterpart is a duplex channel (transmitting on one frequency while receiving on another. ) GETTING STARTED Setting the Squelch Threshold Setting the Squelch Threshold Setting the Squelch is important for reception of signals you want to hear. There are ten threshold levels, from 0, which allows all signals to be received, to 9, which allows only the strongest signal to be heard through the speaker. The diagram in Figure 5 demonstrates how setting the threshold level allows you to hear only the signals you desire, while weaker, unintelligible signals are not heard. Adjust the Squelch to the lowest setting by pressing and holding the Squelch (SQ) key, then pressing the DOWN arrow key repeatedly until the display indicates L0. If you hear a voice transmission, change to another channel and repeat this step. While holding the Squelch (SQ) key down, use the UP arrow key to increase the squelch level to L1. If no static is heard, you have set an acceptable squelch threshold level. If you hear static, then increase to the next threshold level, repeating the process until unwanted static is eliminated. Release the SQ key to return to your selected channel. The squelch setting is universal for all channels, but it may require resetting from time to time NOTE: During squelch adjustment, Tri-Watch, Scan, and Weather Alert are suspended. Up/Down Keys Squelch (SQ) Key Signal At Level 6 5 4 Only Signals Sronger Than Level 5 Will Be Heard 3 2 1 EXAMPLE of THRESHOLD SET AT LEVEL 5 Selected Squelch Level FIGURE 5 17 GETTING STARTED Adjusting Volume, Scanning Adjusting the Volume +/- keys. The volume level is indicated by the To adjust the volume: 1. Press the + key to increase the volume or the - key to decrease the volume. (Figure 6) The Volume key may be adjusted using the band of gradually rising bars on the LCD display. Scanning Channels Volume Level Indicator Volume Decrease Increase FIGURE 6 You may want to keep in contact with several vessels in your immediate area at the same time. For this purpose, the scan feature is available. You can program up to ten channels from any combination of USA, International, or Canadian bands into memory. Whenever a transmission is received, the scan will stop at that channel until the transmission ends and then move on until it recognizes another transmission. You cannot scan weather channels since they broadcast continually and do not allow a break in transmission for the scan to move to the next channel. You can utilize the WX Alert feature to monitor for severe weather conditions. To scan channels: Scanning Display Band Select Channel Select 1. [. . . ] "TX" and "RX" - If these two icons flash together or the "TX" only flashes whenever the PTT key is pressed, the unit must be serviced. Contact the GARMIN Product Support Department at (1-800-800-1020) or (913-397-8200) for information. 33 APPENDIX F Glossary Glossary of Radio Terminology and Abbreviations Canadian Channels: Channel designations as defined by the International Telecommunications Service, (ITS). Duplex: Transmit and receive on different frequencies. FM: Frequency Modulation International Channels: Channel designations as defined for use in international waters by the ITS. [. . . ]