Kada postavljate long-range Wi-Fi vezu, želite biti sigurni da je veza čvrsta, no možete li koristiti mješavinu vrsta antene ili biste trebali koristiti samo visoku dobit? Današnji SuperUser Q & A post ima odgovore na pitanje zbunjenog čitatelja.
Današnja pitanja i odgovori nam se javljaju zahvaljujući SuperUseru - podjele Stack Exchange-a, zajednice-driven grupiranja Q & A web stranica.
Fotografija ljubaznošću Karlis Dambrans (Flickr).
Pitanje
Korisnik korisnika SuperUser želi znati treba li imati visoke antene na oba kraja njegove široke Wi-Fi veze:
I am trying to understand how long range Wi-Fi works. As far as I know, Wi-Fi consists of Rx and Tx. When a laptop is connected to an AP, the laptop is able to receive data from the AP (Rx) and also transmit data back to the AP (Tx).
Suppose I want to build a long range Wi-Fi setup to cover a large area and I connect a high-gain omni-directional antenna like the one shown in this diagram to the AP.
So assume that the original AP’s Wi-Fi signal radius is 250 meters, but by using the high-gain antenna, the radius become 1,000 meters.
At 1,000 meters away from the AP and using a normal laptop (without a high-gain antenna), I try to connect to the AP. The signal from the AP is able to reach the laptop, but the signal from the laptop should not be able to reach the AP. Under these conditions, can the laptop actually connect to the AP?
Wi-Fi diagram courtesy of Freeman’s Garage Blog.
Da li korisnici zapravo trebaju visoke antene na oba kraja njegove široke Wi-Fi veze ili ne?
Odgovor
Dobavljači SuperUser-a mgjk, Jamie Hanrahan i David Cary imaju odgovor za nas. Prvo, mgjk:
The antenna changes the shape of the transmission. The electrical signal does not become more powerful, but less is wasted during transmission in directions which are not useful (i.e. up and down).
Similarly with reception, the signals are received from a more narrow field, which strengthens reception and reduces interference.
It is similar to talking through a cone, then listening through the cone for a response. The person at the other end does not need any special equipment, but you have increased the range and sensitivity.
Slijedi odgovor Jamie Hanrahan:
High-gain antennas provide gain on both transmitting and receiving. So, with such an antenna at only one end, you will get more range than with a standard antenna at each end, but less than with a high gain antenna at both ends.
I naš konačni odgovor David Caryja:
You might also mention antenna reciprocity - if a directional antenna can transmit four times as far as a standard antenna, then the same directional antenna can receive from four times as far away as a standard antenna.
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