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AIS Ship plotting thread
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<blockquote data-quote="Terryl" data-source="post: 986290" data-attributes="member: 369937"><p>Most of the VHF traffic in the marine band is limited to 1 watt or 25 watts in port depending on the channel, and you have several channels to work with.</p><p></p><p>My house boat is only 10.2 air miles from me, but due to the terrain I can't get a good enough signal to establish reliable communication, (ship to ship channels) even at 25 watts on both stations. </p><p></p><p>Now once I'm down at the marina the hand held at 5 watts has no problems in contacting the boat at 4 miles.</p><p></p><p>You would need a very high gain VHF dipole, or a good yagi to pick up anything beyond 10 to 15 miles.</p><p></p><p>Shakespeare makes a good line of VHF marine band antennas that cover the 156 to 162 MHz band quite well.</p><p></p><p>Now most long range communications for ship traffic is in the HF and MF bands and is mostly single side band, these bands are in the 2, 4, 6, 8, 12, 16, 18 and 22 MHz range.</p></blockquote><p></p>
[QUOTE="Terryl, post: 986290, member: 369937"] Most of the VHF traffic in the marine band is limited to 1 watt or 25 watts in port depending on the channel, and you have several channels to work with. My house boat is only 10.2 air miles from me, but due to the terrain I can't get a good enough signal to establish reliable communication, (ship to ship channels) even at 25 watts on both stations. Now once I'm down at the marina the hand held at 5 watts has no problems in contacting the boat at 4 miles. You would need a very high gain VHF dipole, or a good yagi to pick up anything beyond 10 to 15 miles. Shakespeare makes a good line of VHF marine band antennas that cover the 156 to 162 MHz band quite well. Now most long range communications for ship traffic is in the HF and MF bands and is mostly single side band, these bands are in the 2, 4, 6, 8, 12, 16, 18 and 22 MHz range. [/QUOTE]
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