Posted: Fri Jan 18, 2008 2:50 Post subject: Newbie: Wireless repeater on tower set-up
First off, I am a newbie, so if this question has been answered ad nauseum, please just point me towards a tutorial.
I want a broadband connection, but the only source of said bandwidth is a wireless DSL set-up in a town approximately 2 miles away. Here in snowy Wisconsin, this two miles is _not_ line-of-sight to my house, so a direct link won't work.
Did I say I want a fast link?
I _do_ have access to a ridge about 1500 ft from my house, that has both line of sight to the water tower with the wireless source (ok, I'll need a tower...) _and_ to my house (ok, through the tops of some trees). I think I should be able to repeat the signal from a tower on the ridge to my house.
My question is: what hardware do I need to accomplish this? To be certain, I can install high-gain antennas to both receive the signal from the source, and repeat it to my house (I think) on the tower. Of course, to make things harder, I'll need to make a solar powered electrical source for this tower, so any anecdotal advise on this front would be appreciated too.
Thanks for the reply. Maybe I don't know how to search these forums (which I did), but, while there is a fair amount of dialogue on _repeaters_, I couldn't find anything on the task I have set before me: using a device (or _two), with two separate external antennas to act as a repeater.
I read a lot of posts where people want to extend the range of an AP to include their basement, or their yard out back. All dealt with omni-directional antennas, used for both receive and transmit. I do not think such a topology will suffice for my needs.
In addition, I haven't found any information (yet) on powering such a repeater off solar power.
>the hardware depends on your moneybag and what u can get <Very Happy>
>broadcom or atheros. there are many discusses about pros and cons.
>i like atheros....better wlan. and often better hardware
Do any of these devices you like support two separate external antennas?
I'm actually working on the same subject. We want to provide WLAN access on the ends of an airfield (1500m long), source & target cannot "see" each other.
I'm not familiar with setting up networks and don't know yet exactly what I have to watch out for, but I plan to place two units at the relay point because of two reasons:
a) the full speed is available. A units in repeater mode would have to cut speed in two halves
b) The units I've seen so far use two or more antennas for antenna diversity, which is not recommended to be misused to point the antennas in different directions. With two units each has its own antenna.
The only thing I have to find out, how I tell the two units to connect to each other via Ethernet ports.
If you do not want to use two units, you might consider a power combiner that connects two antennas (even with different directions) to one unit. A power combiner splits a signal into two by transforming the impedance to a value that ensures impedance matching on all ports. This cuts power down to 50% on each antenna (transmit AND receive).
Klaus. _________________ How am I supposed to know what I think before I hear what I say ?!
well, I looked at one of Buffalo's Routers, they need 1.1 Ampère at 3.3 Volt. For a Solar solution with rechargeable batteries, you would prefer a battery with 12V and use a DC-DC converter, because Solar panels with regulators for rechargeable lead batteries for 12V are more easy to obtain.
With an 80% efficiency converter from 12V to 3.3V, you'll need 375mA @ 12V, which leads to 6 Ah to operate router during the "dark" 16 hours of a winter day. Now you need a solar panel that delivers enough current to charge the battery (say 10Ah) within 6 hours of light, even if the sky is cloudy or even rainy.
Charge needed is about 6Ah *1.4 divided by 6 hours = 1.4 A. And 1.4A * 12V = 16.8W.
This minimum size of your solar panel is only meant as a quick estimation what we are talking about. You would have to think about
- sleep mode consumption of router
- maximum hours of operation (without light)
- minimum temperature on the hill
- snow covering the solar panel
- safety against passers by
We have power in the hangar, on top of which I'll mount my bridges...
KLaus. _________________ How am I supposed to know what I think before I hear what I say ?!
You can mount a directional antenna on the ridge of a house on a high pole and run cabling down into your router. It really depends on how high that ridgeline is.
Otherwise you could use 2 routers set as wireless bridges ethernet cabled back to back so that you can mount directional antennas on each pointing to their respective destinations. Waterproofing and solar powering those will work out pretty expensive.