hi guys.
so why are sectors so expensive? do they have better range or better throughput? can u hav more clients on a sector than an omni?
thanks

Hi,

of course sectors have more range. You can reach more KM with sector. All power goes to 120º or 90º. As in omni the power goes 360º you can't reach the same KM.

Also sector have more vertical degrees.

As you could se here, this sector is an omni with more components:
http://www.hyperlinktech.com/LargerImag ... G2415P-180


I hope this could help you ; )

oh ok. so a 14dbi 12o degree sector antena will go further than a 18o degree 14dbi sector?thanks

Yes. It's like a flashlight (directive), focus (sector) or bulb (omni) every light for one think.

Not more distance, different area. 14dbi is 14dbi. You will not transmit any farther. By reducing the horizontal angle covered, the vertical angle increases. A 14db 120 degree sector has a vertical beam width of about 20 degrees. A 14db 180 degree has a vertical beam width of about 12 degrees. It is a physics thing. It is a relationship of power to the area covered by the antenna.

thanks tim.
so thats why omnis have shorter range because of the large vertical area?eg flashlight example?correct?

the poster wanted to know why they are more expensive, not about performance. Is the mfg really that different to where it justifies the cost difference ?

Hi!

Let's joke a little.

changeip, if you see my first reply you could see a link.

I didn't explain it very well but now I'll try to do it to close the topic.

As you can see in my link this is a 15dBi omni of hyperlink. It's price is 100x. As the 180 degree sector have more components (reflector, and more metal pieces and supports) is more expensive (100x+20y) than the first one.

Let's see:

hahaha
well actually i was interested in the performance comparison btwn omni and sector. i culdnt undastand why a 12 dbi omni was cheapa than a 12dbi sector. bt nw i undastand why

ok next question.
i knw that 2.4 has beta range. bt does 5.8 hav beta throughput?if so why?

ok next question.
i knw that 2.4 has beta range. bt does 5.8 hav beta throughput?if so why?

And the short answer is... sort of.

There are more channels available in the 5GHz bands, so more capacity.

A single 2.4 vs a single 5.8 is virtually identical tho.

so the only advantage of 5.8 is more channels?

smaller fresnel zone, more loss over distance than 2.4. Less noise in general though.

Main advantage (especially in urban areas) is that 5.8GHz have MUCH less interference, and even if it have some, it's probalby weaker than 2.4 Ghz as the amps and equipment are more expensive. In my city i have better link on 5Ghz with -77 signal than on 2.4Ghz with -48.
So, basically, you can have better troughput/ping with same signal on 5.8Ghz than with 2.4Ghz, and you have more channels (this is related to approved channels in your country and may vary becouse of it).

hi dragonmen,
what equipment are u using for highsite and cpe?thanx

ATM we have 158 client APs excluding bridges.
Mikrotik AP's are connected to NOC with 5GHz links using Hypergrid antennas (we also manufacturing 5GHz and 2.4GHz grid and sector antennas). For the active equipment we use CM9 cards (any CM9 series) on the both sides of bridge connections. For AP cards we use various ones (but not CM9 since it's expensive), mostly TPLINK.
Clients have also various equipment, Linksys WRT54G, Ovislink 5460, and mostly D-Link and Gigabyte cards. Recently we started to sell our wifi cards.

oh i also have a few linksys 4 my cpe's. ive seen tplink bein sold at my distributor bt havnt tried them yet. are they reliable?

We use TL-WN551G and TL-WN651G (atheros chipset).
Card very rarely got stuck (in worst case once in 3 months, most of them never got stuck) so you need to disable/enable it, no other issues.
It's also cheap for atheros card.

ok kwl. i think ill give tplink a try then

... 5GHz also has higher (coax) cable loss, something to keep in mind.

thanks 4 pointing that out. i knw that 2.4 is 0.6 for lmr195 and 0.2 for lmr4oo but what is the loss for 5.8? thanks

the manufacture's data sheet of the desired cable will have that info.

Dragonman, do you have a link for those sectors you make? thanks.

the manufacture's data sheet of the desired cable will have that info.

yeah i knw but im away 4 a week so dnt hav much access 2 info except cellphone browser:)

is it possible 2 make a reflector and attach it to an omni to make a sector?

@JR:
Sector info: http://www.reinkjet.co.yu/proizvodi_antene.html
Sector picture and some basic info: http://www.pakom.com/KatalogProizvoda/O ... ra=9007888, price is 4295 din or 52 EUR

@-headstrong-:
Cable loss calculator: http://www.timesmicrowave.com/cgi-bin/calculate.pl
Don't see how it's possible to make sector out of omni.

thanks 4 those links
have u tried making them before? are they as effective as a proper sector?

thanks bill. ill give these DIY antennas ago sumtime

oh ok. so a 14dbi 12o degree sector antena will go further than a 18o degree 14dbi sector?thanks

Actually, is a kg of iron harder than a kg of plastic ?

To the object: It's not about power, it's more about isolation. On an omni, you will always catch the usable signal and the noise from all of the area (360 degrees) Also, usually you can tilt sectors, but it would be no use to tilt omnis....... you will "catch the air" on the other side.
There are by design tilted omnis, but they are quite expensive.
Also, one significant part of sectors are printed pcb's.