Can-Antenna

[Newbiee]

my friend and i want to share dsl connection .. he had the connection with wireless wifi router .. and i wana access it form 250~300 meters away
i have PCI D-link DWA-520 wifi card with internal antenna (its discription says its range is 100 indoor and 400 outdoor)

i dont have enough money to buy outdoor antenna .. i saw Can-Antenna on this site but those post were too old i think in 2004 ;S(no use askin them i think):bang head

i live in the groundfloor of my appartment surrounded by 30 to 35 feet buildings
but form top i can c this roof (means line of sight)

but if i place Can-Antenna on top it will take wire about 35 to 40 feet which is not good as i know .. if not inform me plz:confused:
and if i place it in my room with 5 to 6 feet wire then i think it wont work coz od surrounded buildings .. if not then tell me plz:confused:

i m going to make it but before making i wana confirm that it works ;;:confused:

plz help me in this !! :cry:

w8ting for replies ..:confused:

[PeddlerOfFlesh]

It's pretty impossible to say without actually trying it. There's too many environmental factors. What is the mw of the card and the dBi of the antennta?

[JigPu]

The information you're providing isn't terribly clear, so I'm not sure how useful my answer will be.

Wifi works best if you have a clear line of sight between the two antennas. With you living in an apartment complex, you'll want to be able to see one of your friend's windows from one of your own windows. Any sort of building, structure, or vegetation which blocks or obscures the view will reduce the signal strength and reduce speeds (at best) or make a connection impossible (at worst).

Correct me if I'm wrong, but it sounds like you can see the roof of your apartment building from the roof of your friend's place. This presents two problems. First of all, your apartment manager might not allow you to place an antenna on the roof -- be sure to check before doing anything else. The second problem is, as you guessed, cabling. While a cantenna can be built from scratch for next to nothing, 40 feet of cheap cable will eat up a lot of your signal, and 40 feet of good cable (such as LMR-400) may cost you over $50...

If I had to do a back-of-the-napkin calculation with LMR-400, it'd look like this:

+ 15 dBm transmit level (a little low, perhaps)
+ 10 dBi cantenna gain (anywhere from 8-12 dB would be expected)
- 3 dB cable loss (~50 feet of cable)
- 90 dB free space loss (distance makes a *big* impact)
- 10 dB misc loss (fudge factor)
=======
-78 dBm recieved strength


Substituting for cheaper RG-6...

+ 15 dBm transmit level
+ 10 dBi cantenna gain
- 9 dB cable loss
- 90 dB free space loss
- 10 dB misc loss
=======
-84 dBm recieved strength


You'd expect cards to make a low-speed connection at -80, -90, or possibly even -100 dBm. Based on that, you might be able to get a usable signal. It's hard to say without more concrete numbers.

JigPu

[Newbiee]

Thank alot guys for the response ..

ok now i m thinking to buy this one
http://img440.imageshack.us/img440/3637/wifioutdoor.jpg

Key Specifications/Special Features:

Frequency: 2,400 to 2,500MHz
Bandwidth: 100MHz
Impedance: 50 ohms
VSWR: 2.0:1
Gain: 2 to 3dBi
Input power: 50W
Polarization type: vertical or horizontal
Working temperature: -40 to +85°C
Humidity: 55 to 75%RH
Waterproof protection: IP67
Size: (D) 13 x 145 or 13 x 162mm

Now tell me .. that if we both (me and frnd) buy this antenna one for my adapter and other for his router .. with 30 ~40 feet wire
having distance of 250 meters (approx) with line of sight

will i work ?

i just want to be sure b4 buying coz i dont wana waste money (dont have enough to wast :P)

[Newbiee]

Reply ASAP plz... coz m using PREPAID wireless net .. have to pay 2$ for just 24 hours :S

so plz replay fast ... i may go for the internet sharing . if response is positive ..

[PeddlerOfFlesh]

We can't say for sure whether it will work. I would put my money on "no". I'd at least get a higher gain antenna.