Advice Needed Longest pole possible on wall mount brackets

[kingkad]

Hi Guys

I'm doing a 500m point to point link and plan to pole mount the antennas as high as possible to clear the fresnel zone. They will be attached to the wall of a 2 story building on both sides. The antenna on top weights nothing.

Whats the best way to mount the poles? T&K or something else?
Whats the longest poles I can use (not in terms of law but in terms of feasibility)

Thanks

 

[Captain Jack]

Use several K brackets as far apart as possible. All depends on the size and weight of the pole and the wall construction it will go on. Lamp posts are pretty high up but those are concreted into the ground ...

Btw, do you still have that 3.7m dish in London?

 

[kingkad]

Yep the big dish is still there, have moved to midlands now but dish is still there on the roof in croydon not doing much.

With this pole, if if have 2.5m of wall to play with and a use 3 brackets, you reckon 20ft? 24ft? pole. Do I want a heavier higher gauge pole or lighter. On both sides the actual weight of the pole wont be on the brackets as the bottom of the pole will be sitting on a flat roof.

 

[Terryl]

If you need to clear the fresnel zone for the antenna's you need to know the total height of any obstruction in the path, then use this calculator to find out how high you have to go.

https://www.hol4g.com/cgi-bin/fresnel/main.cgi

 

[TJExcalibur]

I prefer these brackets, load spread over a wider wall area. Satix SMN00200

 

[RustySpoons]

If you need to clear the fresnel zone for the antenna's you need to know the total height of any obstruction in the path, then use this calculator to find out how high you have to go.

https://www.hol4g.com/cgi-bin/fresnel/main.cgi

Can't get that link to work here, is it down?

 

[Channel Hopper]

Yep the big dish is still there, have moved to midlands now but dish is still there on the roof in croydon not doing much.

With this pole, if if have 2.5m of wall to play with and a use 3 brackets, you reckon 20ft? 24ft? pole. Do I want a heavier higher gauge pole or lighter. On both sides the actual weight of the pole wont be on the brackets as the bottom of the pole will be sitting on a flat roof.

Use a minimum of a 3" pole on 18' above the top bracket, and 4" if you are considering anything higher.

A metal lamp-post is designed to be flexible, so avoid using one for this purpose.

 

[RustySpoons]

A metal lamp-post is designed to be flexible, so avoid using one for this purpose.

That's is very true! A lot of structures are designed to be flexible, a lot more so than people realise.
Certainly no good for a dish.

Same with Ham radio towers, fine for antennas not for dishes.

 

[aceb]

I'm glad my tower don't flex! Don't think the neighbours would be to happy watching 15M of mast and beams sway around in the wind Trilite or other aluminium tri trussing is probably much more rigid than a single pole, shouldn't be that difficult to fabricate some wall brackets to fix it too.

 

[RustySpoons]

I'm glad my tower don't flex! Don't think the neighbours would be to happy watching 15M of mast and beams sway around in the wind Trilite or other aluminium tri trussing is probably much more rigid than a single pole, shouldn't be that difficult to fabricate some wall brackets to fix it too.

They flex enough that you will lose signal on a sat

 

[kingkad]

In this case flexing is not so much of an issue. because of the wide beam pattern (60degree tolerance in Az and El) of each antenna and relatively short link (500m) I have a lot of margin to play with.

This is the Link AP weighs 500g
https://dl.ubnt.com/datasheets/NanoBeam_ac/NanoBeam_AC_Gen2_DS.pdf

Assuming im going for a 20ft pole. Ill put the bottom of the pole in a bucket of cement which will be sitting on the flat roof. Then 2 sets of T&K brackets to hold it on the wall.

So pole gauge and diameter with this setup? Thanks