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Post by Deleted on Feb 26, 2019 11:50:49 GMT
I've recently bought a (moderately sized) Poynting antenna for improving my internet access on board. It comes with a few ways to mount the thing including suckers to mount to a window, a bracket to mount to a pole or to a wall - or I could drill holes in the side of the boat, but I don't fancy doing that to be honest. So was thinking rather than using the suckers, because where I'm going to mount it there is no window, I'd use some magnets a bit like this:
Radio frequency and antenna experts! Will these have any kind of affect on the signal? Part of me thinks it might do.
Cheers!
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Post by IainS on Feb 26, 2019 17:01:07 GMT
Never had a problem with mag mount antennae. The magnetic field from the magnet will be constant, so won't interfere with the electromagnetic radiation.
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Post by Deleted on Feb 26, 2019 17:19:47 GMT
I think I'll give it a go. Those magnets are only pretty small although they should be able to hold the antenna in the strongest of winds. Thanks!
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Post by phil70 on Feb 26, 2019 23:51:17 GMT
I bought some round magnets from eBay, about 20mm dia by 2mm thick. Had a hell of a struggle separating them and so strong it was a nightmare to lift them off whatever piece of metal I stuck them on. So if you want strong magnets they care there to be found.
Another use for them is to use 2 and give yourself Blackman pinch,.... If you like that sort of thing.
Phil
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Post by Deleted on Feb 28, 2019 13:37:43 GMT
I bought some round magnets from eBay, about 20mm dia by 2mm thick. Had a hell of a struggle separating them and so strong it was a nightmare to lift them off whatever piece of metal I stuck them on. So if you want strong magnets they care there to be found. Another use for them is to use 2 and give yourself Blackman pinch,.... If you like that sort of thing. Phil
I had to google that!
I received some magnets in the post but to be honest, I'm not convinced they're going to be suitable. I'm thinking of a more permanent fixture but I'm a bit hesitant to drill through the boat. So looking for other ideas on how to mount this antenna!
This is the antenna I've bought:
So basically either bolt to the side of the boat or attach to a mast. (or use the rubber sucks to mount to a window but I'm not doing that)
I'm probably going to have to drill at least one hole in the boat to get the cables out.
Wondering if anyone has any suggestions on how I might be able to mount the antenna? I was thinking of some kind of heavy duty double sided table perhaps, then at least I can remove it at some point.
And actually how to weather-seal the hole once I've drilled it for the antenna cables!
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Post by JohnV on Feb 28, 2019 17:08:40 GMT
There are stuffing glands that have a grommet designed for shotgun cable which is what that antenna appears to use but I haven't seen any for years, we used them on cctv installations but I got out of that 15 or more years ago and although I have had a quick google round, I can't find a source.
From the outside it looked like a conventional plastic stuffing gland but the rubber insert was shaped for the figure 8.
Failing that Use a conventional stuffing gland, don't do it up tight so you don't squeeze the cable too much and use a good sealant to make the dome watertight
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Post by Deleted on Feb 28, 2019 17:28:51 GMT
There are stuffing glands that have a grommet designed for shotgun cable which is what that antenna appears to use but I haven't seen any for years, we used them on cctv installations but I got out of that 15 or more years ago and although I have had a quick google round, I can't find a source. From the outside it looked like a conventional plastic stuffing gland but the rubber insert was shaped for the figure 8. Failing that Use a conventional stuffing gland, don't do it up tight so you don't squeeze the cable too much and use a good sealant to make the dome watertight
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Post by JohnV on Feb 28, 2019 18:24:16 GMT
That is the kind of thing .... stuffing gland was the name used for the original type of metal bodied cable glands back when Adam was a lad.
The "shotgun" cable (with RG59 coax as one barrel) shouldn't be pinched too tight. If it is crushed it will cause a signal loss (though possibly not very great) and as I said the standard types do not readily accommodate figure 8 construction cable. It is truly amazing how much water can leak down a cable gland even when done up tight around a circular cable ..... so I would recommend a judicious addition of sealant.
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