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2. Marine VHF radio - Wikipedia

   en.wikipedia.org/wiki/Marine_VHF_radio

   A standard handheld marine VHF, mandatory on larger seagoing vessels under the GMDSS rules A VHF set and a VHF channel 70 DSC set, the DSC on top A vintage (76–89) marine VHF radiotelephone. Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship ...

3. Maritime mobile amateur radio - Wikipedia

   en.wikipedia.org/wiki/Maritime_mobile_amateur_radio

   These antenna configurations are more common on merchant ships. A handheld amateur VHF radio transceiver ready for "maritime mobile" use on a 28' yacht. For VHF and UHF operation, one option is to mount a small Yagi antenna to a pole 1–2 m (3–6 ft) long and haul this to the masthead using a flag halyard. If the halyard is correctly knotted ...

4. Very high frequency - Wikipedia

   en.wikipedia.org/wiki/Very_high_frequency

   VHF is the first band at which wavelengths are small enough that efficient transmitting antennas are short enough to mount on vehicles and handheld devices, a quarter wave whip antenna at VHF frequencies is 25 cm to 2.5 meter (10 inches to 8 feet) long.

5. SINCGARS - Wikipedia

   en.wikipedia.org/wiki/SINCGARS

   A Marine Corps 2ndLt operates a PRC 119 during training in Quantico, Virginia. November 1983: ITT Corporation (ITT) wins the contract for the first type of radio, for ground troops. May 1985: ITT wins the contract for the airborne SINCGARS. May-June 1988: 4th Bn, 31st Infantry begins initial field tests of the SINCGARS radio at Fort Sill

6. Land mobile radio system - Wikipedia

   en.wikipedia.org/wiki/Land_mobile_radio_system

   Land mobile radio systems use channels in the VHF or UHF bands, since the antennas used at these short wavelengths are small enough to mount on vehicles or handheld transceivers. Transmitter power is usually limited to a few watts, to provide a reliable working range on the order of 3 to 20 miles (4.8 to 32 km) depending on terrain.

7. Digital selective calling - Wikipedia

   en.wikipedia.org/wiki/Digital_Selective_Calling

   For VHF, DSC has its own dedicated receiver for monitoring Channel 70, but uses the main VHF transceiver for transmission. However, for the user, the controller is often a single unit. [ 1 ] MF/HF DSC devices monitor multiple bands for distress, urgency and safety sécurité transmissions in the 2, 4, 6, 8, 12 and 16 MHz marine bands.