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Old 28-01-2016, 07:13   #1
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What's this antenna?

I'm about to go up the mast to clean off a bunch of stuff and to install new VHF and Wilson cell antennas. I haven't been up to the very top yet, but am assembling the tools I think I'll need. One mystery is this antenna that's been on the boat a long time. I don't know what this thing is, although I know it's not hooked to anything on board. I'm pretty sure it's on a small coax that terminates in a loose BNC at the foot of the mast, but not 100% sure. In any case, I haven't been able to identify what this is.

Anyone recognize this?
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Old 28-01-2016, 07:18   #2
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Re: What's this antenna?

Looks like an aircraft high band VHF "blade" antenna.
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Old 28-01-2016, 07:26   #3
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Re: What's this antenna?

Satnav?
Loran?
Is it round or is it a blade, be a funny aspect ratio for a blade.
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Old 28-01-2016, 07:29   #4
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Re: What's this antenna?

Quote:
Originally Posted by sailstax View Post
Looks like an aircraft high band VHF "blade" antenna.
===

If so it might have been used with a VOR aircraft navigation receiver. They were popular on boats prior to the availability of Loran-C.

https://en.wikipedia.org/wiki/VHF_omnidirectional_range
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Old 28-01-2016, 07:33   #5
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Re: What's this antenna?

Humm... It looks like a low profile helical VHF or Broadband antenna to me
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Old 28-01-2016, 10:56   #6
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Re: What's this antenna?

It's an "X" shape in cross section. I just went out with my limited zoom and got another photo, with a little more detail on a sunnier day.
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Old 28-01-2016, 12:47   #7
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Re: What's this antenna?

It reminds me of a Magnavox SatNav antenna that was on my previous boat when I first bought it.
That antenna had an X cross section.

Here's one of those Satnavs on eBay, but nothing is said about an antenna.
It's good for a laugh these days.

http://www.ebay.com/itm/RARE-Magnavo...lVN0WJ&vxp=mtr
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Old 28-01-2016, 13:34   #8
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Re: What's this antenna?

Well, there's a now unused original circuit breaker on the DC panel for "SatNav". But I've been searching for images of various sat nav marine antennas, and cannot find anything close to this. I know it's obsolete, and I'm going to take it down when I'm up there. Was mostly curious, as I've been going to sea since my summer jobs running gravity meters and such in the mid 60's working offshore with Loran C, and have at least some experience with just about everything since, and I don't recognize it. I was thinking that if I knew what it was I could offer it for sale or trade in case there's somebody somewhere that wants one of these. Pretty safe bet it's rare these days. Otherwise I'll just chipcan it.
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Old 29-01-2016, 12:02   #9
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Re: What's this antenna?

I KNEW I had a pic of it somewhere.
It was taken right after we purchased the boat.
This antenna was mounted on the stern rail and it went to the Magnaxox 4102 SatNav.
It had a short metal antenna above the white part (probably a loading coil/preamp?)

They are obsolete and missing the upper part and as beat up as yours looks, I doubt you will find a buyer.
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Old 29-01-2016, 13:03   #10
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Re: What's this antenna?

Heck I'd give it away if someone wanted to pay the shipping. Thanks for the photo, and ID. Now it makes sense. Was driving me nuts.
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Old 29-01-2016, 21:43   #11
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Re: What's this antenna?

BTW, that pic was from 1987.
29 years ago! How time flies....
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Old 30-01-2016, 06:06   #12
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Re: What's this antenna?

This boat was built in '85, in England, for an American who took it to the Med and then to the Caribbean and Central America for several years. We know the boat spent two years in Rio Dulce, late 80's. So he would probably have spec'd the satnav to be installed at Tom Lack Catamarans in Christchurch. That antenna has been up there 31 years.
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