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Old 20-03-2018, 04:37   #1
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Join Date: Aug 2011
Location: Zeebrugge, Belgium
Boat: Jeanneau Voyage 37 ft
Posts: 259
Sailing boat antenna modeling & radiation patterns

Hi folks,
haven't been here on this forum for quite a while.
With all discussions on choice of HF antenna (isolated backstay - whip vertical - sloping wire alternative backstay antenna etc) - and using a 9.2m end-fed sloping wire myself - I was interested to find out what the radiation patterns are (horizontal & vertical) and the influence of the rigging.
Have made a model of a 37ft sloop including spreaders, lower shrouds, boom, guardrails, and modeled in 4NEC2 for several type of antenna's:
41 ft isolated backstay
41 ft sloper parallel to backstay
9.2m isolated backstay
9.2 m sloper
9.2m vertical whip (just for fun...)
7.2m vertical placed midstern - placed 0.3m from center - on side 1.5m from center.
Quite interesting to see the patterns from 2.2 Mhz up till 28 Mhz and directivity effects of the rigging on some frequencies.

Anyone interested in the file? PM me jan dot de dot smet8 at telenet dot be
I am also interested to share conclusions with people who have done the same.
Jan
ON3ZTT, Belgium
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Old 20-03-2018, 10:37   #2
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Re: Sailing boat antenna modeling & radiation patterns

Jan, tried sending you a email but it bounced back. Appreciate if you could send file to me W4GRJ at Arrl.net
73's
Jack
W4GRJ
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Old 21-03-2018, 10:06   #3
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Location: Penobscot Bay
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Re: Sailing boat antenna modeling & radiation patterns

Jan, I would be very interested in seeing your modeling result. Please send the files to wguinon@gmail.com Regards Walter Guinon
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Old 22-03-2018, 10:20   #4
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Location: Zeebrugge, Belgium
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Re: Sailing boat antenna modeling & radiation patterns

Hi Walter have sent you the file. Enjoy

Jan
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Old 23-03-2018, 05:04   #5
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Location: Camden, ME
Boat: A Thistle and a Hallberg-Rassy 36
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Re: Sailing boat antenna modeling & radiation patterns

Quote:
Originally Posted by Goudurix View Post
Hi Walter have sent you the file. Enjoy



Jan


Jan -

Good job. I would like the file too.
summitradioman@gmail.com

Thanks
Chip
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