The issue of antenna height is of greater relevance when considering Class B AIS transmission, because at either 2 or 5W the effective reception range is directly dependent upon this (and may in any case be far less than the nominal VHF horizon).
It’s worth noting that a Splitter operating via a 156MHz antenna is a good 10% down on efficiency when compared to AIS connected direct to an AIS antenna, tuned to 162MHz.
When you are on an ocean passage, it's good to know what else is out there and it adds interest to dull night watches, so increased AIS range is beneficial. We have two masthead antennas, for redundancy, so there's no issue in having one devoted to AIS.
It’s all about priorities. With a choice of only one antenna up at the highest point I’d opt for voice-optimised VHF first. If you’ve got space for two, lucky you. With a ketch aid put voice on the main mast and AIS on the mizzen.
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Makes sense. Thanks for sharing, and especially for keeping it short and to the point :-)
I always try and keep it short and to the point. Brevity is my middle name. As a boating journalist on a leading magazine I could always cut stuff down to fit the page, but really struggled to add words when I’d already written all I felt was correct.
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Take a breather , love it !
The issue of antenna height is of greater relevance when considering Class B AIS transmission, because at either 2 or 5W the effective reception range is directly dependent upon this (and may in any case be far less than the nominal VHF horizon).
It’s worth noting that a Splitter operating via a 156MHz antenna is a good 10% down on efficiency when compared to AIS connected direct to an AIS antenna, tuned to 162MHz.
When you are on an ocean passage, it's good to know what else is out there and it adds interest to dull night watches, so increased AIS range is beneficial. We have two masthead antennas, for redundancy, so there's no issue in having one devoted to AIS.
It’s all about priorities. With a choice of only one antenna up at the highest point I’d opt for voice-optimised VHF first. If you’ve got space for two, lucky you. With a ketch aid put voice on the main mast and AIS on the mizzen.
Makes sense. Thanks for sharing, and especially for keeping it short and to the point :-)
I always try and keep it short and to the point. Brevity is my middle name. As a boating journalist on a leading magazine I could always cut stuff down to fit the page, but really struggled to add words when I’d already written all I felt was correct.
Brevity is my middle name.
Great video. Would the same logic apply to radar? I’m in the market for a radar system and not sure where to mount it.
I’m not keen on high mounted radar scanners on yachts. Who cares what’s 12 miles away? Much more interesting to know the 2-3 miles around you.
Hey sir
Can I get your social account I want to contact you to see my sextant it is literally very old