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Aerial siting headache

PostPosted: Thu Feb 15, 2018 9:18 am
by Halfajobrob
Hi all,

I live in a mid terrace (so no gable to access).

The first floor up to the roof is covered in hanging tiles, which are unlikely to take the weight of tk bracket without cracking and causing damage...

I also want to be able to access it myself so I can change aerials etc so the chimney isn’t great either - on a budget this option would need me to pay an aerial fitter...

The only solution I can think of is this: put the TK bracket below the tiles (1-2m off the ground) and send up a 4 or 5m pole to get me clear of the eves...

Something like this... http://www.wrightsaerials.tv/roguesgallery/126.shtml Which is mocked by the professionals :biggrin: :embarrased:

Anyone else had similar issues and what did you do?

73s
Rob

Re: Aerial siting headache

PostPosted: Fri Feb 16, 2018 9:11 am
by G4RMT
I think I'd mock it too - I can imagine the banging in high winds when it hits the building. The obvious solution for the building where you need to access the antennas is something like the products these folk sell.
https://www.mm0cug.co.uk

Not going to be cheap - but if you want height and don't want to wreck the house..........

Re: Aerial siting headache

PostPosted: Fri Feb 16, 2018 12:15 pm
by m0lsx
If you put the main mounting brackets low down & then put a second bracing bracket from the barge board to the mast. The bottom bracket on a TK should always be the K, as that takes all of the weight & the top T should not be over tightened onto the pole to stop it snapping in the wind. The top T should just hold the pole in balance, so be firm, but not a point of weakness as the wind moves the pole at that position. So with a long pole you could simply add a second T higher up the mast at the barge board. Being screwed into thin wood rather than into brick work it will be less secure than the bottom T, but it's a second balancing brace.
The other option that is cheaper than G4RMT's, but slightly more expensive than my suggestion above. Get a cheap & simple manual telescopic mast & make sure you do not leave it up all the time.
Moonraker sell a 50 foot (15 meter) heavy duty telescopic fiberglass mast for £350.
https://www.moonraker.eu/antennas/masts-poles-tripods/tmf-3-50ft-heavy-duty-fibreglass-telescopic-mast

Re: Aerial siting headache

PostPosted: Mon Feb 19, 2018 3:17 pm
by Halfajobrob
Thanks both. I can see this getting quite expensive quite quickly! I only wanted to get just above the eaves to get in to a few more repeaters.

Hence the 'bodge job' which would only cost me £50 in comparison to those expensive masts :biggrin:

Oh dear. Well local repeaters it is for now, as they say, any aerial is better than none!

Re: Aerial siting headache

PostPosted: Mon Feb 19, 2018 4:27 pm
by G4RMT
I suppose the only other practical al alternative is just a 50mm 6m Ali tube on two brackets which might reach above the roof and be stiff enough to not move much. With a bit of ingenuity, you could also perhaps change use Doughty clamps which will allow very easy on and off without tools.

https://www.stagedepot.co.uk/rigging-install-staging/hardware/hook-clamps-and-half-couplers/doughty-half-coupler-clamp-polished?sku=ENL-2877&gclid=Cj0KCQiAiKrUBRD6ARIsADS2OLnmJDxRpycw0hDG3D1nunqrKEKEeEvv7sc-Vxzc854Zzxd-IVioJSwaAufZEALw_wcB

Image


One on each bracket.

Re: Aerial siting headache

PostPosted: Mon Feb 19, 2018 4:38 pm
by m0lsx
Halfajobrob wrote:Thanks both. I can see this getting quite expensive quite quickly! I only wanted to get just above the eaves to get in to a few more repeaters.


I did also suggest a third bracing bracket at the barge board. This would give the longer pole needed some rigidity & stop too much pressure from being put on the two lower brackets. But the barge board is thin-ish & the main weight & bracing needs to be into the lower brickwork.