upgrade from Bullet 2HP - is it worth in my case?

[Honza7]

Hi,
I'm currently using 2x Bullet2HP (p2p) however I'm planning to switch to Bullet M2 as they (hopefully) appear in the end of August. My current parameters:
Signal Strength:
-67 dBm
TX Rate:
48 Mbps
RX Rate:
48 Mbps
Noise Floor:
-94 dBm
Security:
WPA2
ACK Timeout:
24
Transmit CCQ:
96%
QoS Status:
No QoS

while the real throughput is about 2800kBps down, 1100kBps up and <1% packet loss. Range cca 100m, lots of trees (NLOS). Temperatures -20°C ~ +40°C

If I look in your datasheet (http://www.ubnt.com/downloads/b2hp_datasheet.pdf) I should be able to achieve 54Mbps link speed with B2HP however for some reason I can't (link dies and throughput goes down).

/a/
My question is is it wort in my case to upgrade to Bullet M2? I guess I will be able to achieve about MCS4 which is 90Mbps link rate - is my guess correct? What is real throughput at 90Mbps link rate when using 802.11n?

/b/
I've lots of broad leaf trees in my area (it will loose leafs in Autumn) so during Winter I'll be fine however from Spring to Autumn I'm suffering - when trees occur is it better to use 2,4GHz or 5GHz? (generally)

Thank you for your reply.
BRGDS Honza

[WHT]

2.4 will always be better when dealing with trees.

[stonefish]

Really? How's that work?
I thought the problem was that trees are full of water, which resonates at 2.4

[rado3105]

Yes, but sometimes where there is another network in place you radiate, noise causing worse parameters in 2.4 than in 5Ghz with trees. Theses days in many are is crucification yourself to use 2.4GHz(a lot of people use wifi-2.4 to wirelessly cover house...So only 5GHz usable these days.

[rado3105]

Yes, but sometimes where there is another network in place you radiate, noise causing worse parameters in 2.4 than in 5Ghz with trees. Theses days in many are is crucification yourself to use 2.4GHz(a lot of people use wifi-2.4 to wirelessly cover house...So only 5GHz usable these days.

[WHT]

water, which resonates at 2.4Ummmmm......No.

That is a common misconception. Resonance occurs at several frequencies, all of which are over 20 GHz. Microwave ovens use 2.5 GHz, as well as 915 MHz because they are in the ISM radio bands for unlicensed radio emitters.

[cwnetwork]

And so back to his other question... is it a good idea for him to go the m2 way? will the troughput be higher despite the fact that the m2 has 200mw less power? (his snr will change is what i mean)

[rconaway]

If you were running true 802.11N with multiple radios, the answer is yes.

I would say you would probably see an improvement but that also depends on what power output you have the HP's at.

[Honza7]

Thank you guys for your replies. I'll probably stick with my current 2HP as long as it has better txpower. Maybe later when it won't be enough I'll switch to better antennas and then switch to M2.

About that 2,4GHz vs 5GHz + trees, I asked about that a friend of mine who works as ISP technician who built quite a lot of wireless networks and he said, that even though there are trees and it's NLOS it's still worth a try. However what I remember from school lower frequencies are generally better when NLOS...

[Barlennan]

If trees are your problem and not interference in the 2.4ghz range then you can try circularly polarized antennas on both ends to get a better link through trees. If there is a lot of 2.4ghz chatter in the area you will double your interference with a circularly polarized antenna. Don't go 5hz the wavelength is smaller and you will get a worse signal. But if you are just looking at a p2p link and considering new equipment anyway just get something in the 900mhz frequency and you will shoot right through trees without much of a problem at all.