User manual GARMIN VHF 720

[. . . ] VHF 720 Marine Radio Owner's Manual & Reference Guide © 1999 GARMIN Corporation GARMIN International, Inc. Compliance 1200 E 151st Street, Olathe, Kansas 66062 USA Tel. Statement or 800-800-1-20 913-397-8200 Fax. Unit 5, The Quadrangle, Abbey Park Industrial Estate, Romsey, SO51 9AQ UK Tel. 1, Lane 45 , PaoHsing Road, Hsin Tien, Taipei, Taiwan, R. O. C. [. . . ] 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 5 5 4 Only Signals Stronger 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. Before activating the scan feature you must program at least two channels into memory. You can do this by pressing the U/I/C key to select the desired channel band and then use the UP/DOWN arrow keys to select channels in that band. Press the MEM key to place the displayed channel in the scan memory. Repeat this process for the desired channels. Press the SCAN key to begin the scanning process. [. . . ] "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. [. . . ]