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03-13-2021, 05:07 PM
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#1
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Senior Member
City: Russell NZ
Vessel Name: MV Unique
Vessel Model: Salthouse Coastal 35
Join Date: Jul 2013
Posts: 191
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VHF antenna rebuild
I am not greatly optimistic but living in hope that some one can help me with this inquiry I have drawn blanks here locally and cannot even get Shakespeare to respond.
I have suffered a lightening strike on my 2 meter VHF antenna, the fiberglass pole, chromed brass base is fine apart from a burn mark and the internal 36inch brass rod and accompanying 2 1/2inch brass tube soldered at the base are fine however the coax entry and connections at the base are fried and internal soldering where coax center was soldered to rod melted.
I have purchased a new coax cable and am seeking advice as to how to rebuild etc.
I am presuming the coax center will be soldered to the 36 inch brass rod as previously however unsure as to where to attach the earth braid and whether any other fittings are required.
Any help available would be greatly appreciated
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03-13-2021, 05:53 PM
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#2
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TF Site Team
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 15,400
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Personally I would not trust an antenna that has been struck by lightning. The VHF is a primary safety device and as such I would not trust a damaged antenna for calling in an emergency. Just my 2 cents worth...
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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03-13-2021, 06:01 PM
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#3
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Senior Member
City: Brentwood Bay, BC
Vessel Name: Golden Dawn
Vessel Model: Krogen 42
Join Date: May 2011
Posts: 227
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A 2-m Shakespeare antenna - one of the least expensive things you can buy for a boat isn't it? Last one I bought was about $50 . . .
__________________
John Harper
Golden Dawn, KK42-82
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03-13-2021, 06:53 PM
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#4
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Senior Member
City: Jacksonville
Vessel Model: American Tug 41
Join Date: Sep 2018
Posts: 222
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Phil,
a 36-inch VHF is a half-wave end-fed monopole. They generally do not require a ground plane, however, there could be some type of transformer or matching circuit inside the base that is used to help match the very high impedance of the antenna to the low (50-ohm) impedance of the coax. I can't speak for shakespeare so I don't know how they do this matching.
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03-13-2021, 09:33 PM
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#5
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Guru
City: St Augustine,Fl
Join Date: Sep 2009
Posts: 3,632
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Why wouldn't you just replace it rather than guess at a repair? You may end up spending more on a bandaid fix..
__________________
Jack ...Chicken of the sea! Been offshore 3 miles once
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03-13-2021, 10:13 PM
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#6
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Guru
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,420
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Sorry it’s trash for use on a boat.
__________________
Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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03-13-2021, 10:44 PM
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#7
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Senior Member
City: Russell NZ
Vessel Name: MV Unique
Vessel Model: Salthouse Coastal 35
Join Date: Jul 2013
Posts: 191
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Wanting to rebuild for landbased/home use just for the hell of it got so many old lying aroind
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03-15-2021, 12:06 PM
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#8
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Guru
City: Palm Coast, FL
Vessel Name: Coquina
Vessel Model: Lagoon 380
Join Date: Jan 2017
Posts: 2,353
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https://we.riseup.net/assets/295748/...F+antennas.pdf
check out page 16; Gain Sleeve Dipole. You haven't said the overall length of your antenna. This applies to the popular 8' versions.
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