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Originally Posted by greekman  We planing to install the bridge under the roof,and the antenna on the roof.
I would prefere an external/outdoor antennas because of atmospheric/terrain issues etc.
The cable loss calculations is showing,that I can easily take up to 10 meters.
On the site of radiolabs.com I calculated,that:
--- Free Space Loss on 0.15 km 83,55 dB / to bridge receive sensitivity 96 dB
--- 6 dBi for antenna is enough for 150 meters ,and putting higher gain dBi might be illegal ( in EU 20dB ) ?
--- What I am doubted about,if antennas are with high gain,what is the way to reduce the "drilling power" ?
Here is Freshel Zone - 1st f.zone radius 2m at distance 80m ,and 60% No Obstacle Radius is 2 meters.
On the way of one link,the top of tree is crossing possibly that zone.But not enterely. |
What a shame to hear about the Netgear forums!
You are certainly always welcome here however!
With regards to your link, 20dBm EIRP is pretty low as a legal limit.
In fact operating the WG302 at all in Europe is technically illegal as according to the specs it puts out 25dBm EIRP from the factory! Yet they still manage to sell them fine so I'd personally still go with it.
10m of cable (make sure it's good quality at that length) will provide you with a bit of attenuation so that will help keep things toned down with regards to EIRP. I wouldn't be too concerned about the 20dBm limit if you are only running slightly above this and if the installation is done well with minimal interference to others.
The Fresnel zone issue in your case will be fine. Trees don't do an awful lot to the signal over such a short distance unless they are very thick and as you still have visible LOS there should be no cause for concern once again.
I think the odds are in your favour with this project and you should find it pretty straightforward to get the link running reliably.
I hope it all works out well.