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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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Boat: Jeanneau Voyage 37 ft
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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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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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Old 06-05-2018, 17:18   #6
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Join Date: Jan 2012
Location: Southern California, USA
Boat: Beneteau 473
Posts: 148
Re: Sailing boat antenna modeling & radiation patterns

Quote:
Originally Posted by Goudurix View Post
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

This sounds awesome Jan. I would love to see your modeling file. Please use info@tryonmastering.com.

In the past I have used slopers on two different sailboats; one a Rawson 30 and the other a Morgan 41 Classic CC sloop; both with the backstay insulators right at the masthead for sort of an unbalanced sloper with the braid of the coax connected to all the rigging. Funny quick story; I sold the Rawson 30 to a couple that took it all the way around the world in a seven year voyage and I was living aboard my Morgan Classic with its sloper installed. We had incredibly good communications "sloper to sloper" all the way down through the South Pacific.

Now my situation has changed and I've just purchased a Beneteau 473 with TWO backstays! Talk about complicating things! Ha! I plan to run a sloper on each backstay; one short and one long in an effort to pick two lengths that are sort of electrically invisible to each other. Then the plan is to be able to switch between them with two SPDT latching relays at the masthead which can choose my 4:1 and 9:1 Unun for either backstay. My goal being to have the Kenwood TS-480SAT be able to tune all the bands I need without an external tuner.
BalunDesigns.com has some incredible baluns and ununs. Here's a link to the multi-ratio Unun I plan to get >> https://www.balundesigns.com/model-4...-1-54-mhz-5kw/

Thanks much!
Martin
s/v Lucky Spin
Ventura, CA
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