User manual HUMMINBIRD DC 25

[. . . ] What You Need Your Humminbird VHF radio requires the connection of a VHF marine band antenna. These antennas are readily available through marine distributors and come in a variety of shapes, materials, and mounting types. A high Quality antenna will maximize your transmit range and reception clarity, and compliment your Humminbird VHF radio. You can use your Humminbird VHF radio with any other quality marine band antenna . [. . . ] Note: Do not operate the Humminbird VHF radio without a 50-ohm marine band antenna. Attempting to do so may damage the unit. Humminbird is not responsible for damages caused by operation without an antenna or with an inappropriate antenna. TESTING THE INSTALLATION After connecting your antenna to the Humminbird VHF radio, you're ready to verify that it is properly installed and powered up. Turn the radio volume knob to the right. The LCD screen should light up and display the number 16 (for the preselected Channel 16). Pick up the microphone; press the button on the microphone and keep it pressed as you look at the LCD screen. If the "T" transmission symbol blinks at the left of the channel indicator, the unit is properly powered up and capable of transmission. Complete information on operating the Humminbird VHF radio is provided later in this manual. First, spend a few minutes with the following pages to acquaint yourself with the radio controls. HUMMINBIRD VHF RADIO CONTROLS All features of your Humminbird VF radio are controlled by the front panel knobs and buttons, plus the microphone button. VOLUME ON/OFF turns power to the radio on and off, and controls the volume of both the built-in speaker and any auxiliary speaker connected to the radio. When power is first turned on, the radio is automatically set to Channel 16 (emergency and calling) in the USA frequency band. SQUELCH eliminates background noise when the radio is not receiving a signal and controls the sensitivity of the scan function. CHANNEL selects the channel to use for transmission and reception in the current frequency band (selected with the USA/INT and WX buttons). Turning the knob to the right advances through the channels in ascending order, and turning it to the left selects channels in descending order. Note that some channels have a specific purpose; be sure to see the "Table of Marine Channels" that appears later in this manual. SCAN scans all channels for signals in the selected frequency band. Pressing SCAN causes the radio to begin scanning from the lowest channel, and to lock in on the first channel for which a signal is detected. When a signal is no longer present on that channel, scanning resumes. There are several ways to channel scan: Press the scan BUTTON again, press the microphone button once, or turn the CHANNEL knob. Scanning is also cancelled if you press the CH 16 button. DUAL enables the "dual watch" function, which lets you monitor Channel 16 while receiving on any other channel. The radio switches immediately to Channel 16 of the last-selected frequency band (USA/INT) when a call is detected, then switches back when the Channel 16 call is completed. To cancel dual watch, press the DUAL button again. HI/LO selects the power level for transmission. HI transmits at the maximum legal wattage for each channel, usually 25 watts; LO transmits at 1 watt. Use LO for in-port or short-range communications, HI for longer range communications. The current HI/LO selection is indicated on the LCD screen. Holding the HI/LO button down while transmitting will override the low transmit default on USA channels 13 and 67, and International channels 15 and 17. WX selects the Weather frequency band (Weather Channels 0 through 9), as shown by the WX indicator that appears on the LCD screen. Note that the Weather channels are receive-only; pressing the microphone button when you are in this frequency band turns off the speaker, but transmits nothing. [. . . ] To resume speaking to the other party, depress the microphone button and again, speak at a normal voice level. Note: You must give your call sign at the end of any transmission that lasts for more than 3 minutes. Break and give your call sign at least once every fifteen minutes during long ship-toshore calls. Limit unanswered calls to no more than 30 seconds, and do not repeat a call for more than two minutes. [. . . ]