[BulletM2] Importance of channel 6 when operating in 802.11N

[MCunha]

Hi,

I need a short distance link (only 200m) with high throughput, but the two buildings are in a area with A LOT of 2.4ghz LANs. So, my 1st plain was use two BulletM5 to avoid the highly saturated 2.4ghz frequency range. But I'm having a lot of difficult to found low gain 5ghz panels, especially rated to operate from 5.1 to 5.4, which I believe to be a clean range and would suffer a little less interference from 5.8ghz cordless phones.
I found at eBay an interesting panel: SuperPass model SPD-D1-J1 (dual band, 2.4ghz and 5.1-5.9ghz, 9dBi) (http://www.superpass.com/SPD-D1-J1.html). But, including import duty and shipping, each panel will cost the same as two bullets. It isn't logical :D

So, now I'm concerning to keep the link @ 2.4ghz, using the actual 12dBi panels, but changing the actual Bullet2 units to BulletM2.
As far I know, when using turbo (40mhz channels), the quality and throughput is dependent from have a clean channel 6/2.437GHz (when using 11g, 2.4ghz).
Finally, the question is: the same applies to 11n @ 2.4ghz? To achieve maximum throughput will I need a clean channel 6 (which I don't have)? I'm thinking to use channels between 2.312 GHz and 2.402 GHz, if available in these new devices.

Regards.

[UBNT-Mike.Ford]

Hello,

For the most part this hold true as the extension channel (if you select any channel will be in part of channel 6. 40Mhz is not usually advisable in 2.4ghz due to the amount of inteference generally present.

Thanks,

[MCunha]

Hi Mike,

Thanks for the extremely fast answer :)
11N is really new to me... To achieve maximum advised throughput, will I need 40GHz channel?
What happens when using 5GHz range (BulletM5)? Any channel will be needed as extension channel?

Thanks in advance.

[UBNT-Mike.Ford]

Hi Mike,

Thanks for the extremely fast answer :)
11N is really new to me... To achieve maximum advised throughput, will I need 40GHz channel?
What happens when using 5GHz range (BulletM5)? Any channel will be needed as extension channel?

Thanks in advance.

Hello,

Yes to achieve the fastest speeds you will need 40Mhz. As for the 5ghz range, whatever channle you select will have an above or below extension channel.

Thanks,

[mobilexpert]

Hi Mike,

Thanks for the extremely fast answer :)
11N is really new to me... To achieve maximum advised throughput, will I need 40GHz channel?
What happens when using 5GHz range (BulletM5)? Any channel will be needed as extension channel?

Thanks in advance.

and 200m is really a short range, i doubt that on those distances,
anything could interfer even on 40MHz channel width ...
use horizontal polarization, and i think it will go slightly.

b.r.
Alexandar

[anthony24x]

How about this baby?
http://www.bizsyscon.com/product.php?id=4025&wastoproduct=yes

[FedeK]

Hello, Use 21dBi solid or grid, It rejects interference much better than low gain antennas.

[WHT]

If you compare apples to apples, say a 21 dBi flat panel antenna to a 21 dBi grid antenna, the grid antenna has lower side lobes which means its going to pick up less interfernce off the main beam axis.