I have a R52Hn and RB493G
http://routerboard.com/R52Hn

I have my WLAN set to 5GHz-only-N with freq 5180
My laptop is connected to it with 802.11n yet windows reports my speed at 54 Mbps, sometimes it get up to 58 Mbps. I'm ten feet away from the router, full signal quality.

On my old router I was getting full N speeds with this laptop.

i tried following post 3 of this:
http://forum.mikrotik.com/viewtopic.php?f=3&t=46858

if i choose 'above control' then for a split second windows says 300 but then it goes back to 54
if i choose 'below control' then for a split second windows says 150 but then it goes back to 54

in the first picture of that thread, he can adjust Channel Width, i dont have that option

check with RouterOS 5.7. make sure you have both chains enabled. you have frequency that supports one of the modes (20/40 above control or 20/40 below control). also, select rate-selection=advanced

Also, usually rates go up when bandwidth increases. And another note - you can get trouble if signal strength is too high.

check with RouterOS 5.7. make sure you have both chains enabled. you have frequency that supports one of the modes (20/40 above control or 20/40 below control). also, select rate-selection=advanced

Also, usually rates go up when bandwidth increases. And another note - you can get trouble if signal strength is too high.

Helo Janisk.

You could explain better on "you can get trouble if signal strength is too high."
The problem happens when both chains enabled?

Thanks.

I just upgraded to 5.7, my board came shipped with 4.14 ...

on the HT tab, i have chain0 for both Tx and Rx checked, chain1 is unchecked

on the Wireless tab:
Band: 5GHz-only-N
Channel Width: 20/40Mhz HT Above
Frequency Mode: manual_txpower
Wireless Protocol: 802.11

the speeds are really making me angry right now, it has issues streaming 720p movies

i am about to try rate-selection=advanced

EDIT: with rate-selection=advanced my connection speed is 120-150 Mbps, it keeps changing
any idea how to bump that up to 300?

if i switch Channel Width to 20/40Mhz HT Below my speed drops to 65 Mbps

increasing my Frequency above 5180 (which is the lowest) drops by speed to 65Mbps, when I switch back to 5180, the speed goes back to 130Mbps...

EDIT 2:
On the HT tab, enabled chain1 for Tx and Rx brings my speed from 160-300 Mbps, it keeps changing about as well, but at least it's somewhat working now

I just upgraded to 5.7, my board came shipped with 4.14 ...

on the HT tab, i have chain0 for both Tx and Rx checked, chain1 is unchecked

on the Wireless tab:
Band: 5GHz-only-N
Channel Width: 20/40Mhz HT Above
Frequency Mode: manual_txpower
Wireless Protocol: 802.11

the speeds are really making me angry right now, it has issues streaming 720p movies

i am about to try rate-selection=advanced

EDIT: with rate-selection=advanced my connection speed is 120-150 Mbps, it keeps changing
any idea how to bump that up to 300?

if i switch Channel Width to 20/40Mhz HT Below my speed drops to 65 Mbps

increasing my Frequency above 5180 (which is the lowest) drops by speed to 65Mbps, when I switch back to 5180, the speed goes back to 130Mbps...

Well, you still didn't enable chain1 isn't it? If only one chain is enabled you only get 150Mbps max.

Connection rates as messaged by the adapters is not the speed. It is actually the rate both radio's agreed upon to work with. The routine on which both agree to communicate with each other is a result of the quality of the link.
The quality of the link is measured in how many package are reaching ´the other end´ without the need to be resend. The more re-sends needed, the poorer the link. Both radio's might than decide to work at a lower rate. This because lower rates (and in ´n´ protocol this can also just mean "other rates" with different coding technology) are usually more stable and sees less ´re-sends´.
Since its all wireless and circumstances are changing every second at times you'll see the rates jump up and down. Just the movement of a pet or human body in the same room changes it. Even a heating source as TV or radiator can already have influence! Even the fact how much data is transported already has an influence on the way how the radio software interprets on what quality the link has.
(I package re-send in 10 is 10% which makes a link not so good. But 1 package in 100 is only 1% which is 10 times better! So the more data send while the amount of package resends stays sort of the same it increases the link quality and the radio's decide to step up to a higher level.)

Mentioned 300Mbps speeds are maximum connection rates that can be reached under ideal circumstances.
Since radio's while sending date packages to each other also send info they both use for setting the link quality and (amongst several other) encryption etc. the real ´usable´ bandwidth of the link is always much lower.
And even if one radio is only downloading that same radio has to send some traffic back to sender (all the data both communicate about on how the packages are receiving and if the rates need to be set and the encryption etc. etc.) so it is almost impossible to reach the 300Mbps download. Speeds mentioned in wireless are therefore also always "aggregated".

So, if you would have a stable maximum connection rate between 2 radio's that can maintain such under heavy load traffic the maximum user data throughput (like a file transfer) will be somewhere in the 250Mb region. Yet again, ideal circumstances!
I would say that if you would manage to get 200Mb tcp traffic through a wireless pipe in full 40Mhz mimo you already have done a good job!

chain0 and chain1 are enabled
i am the only one connected to the wireless right now, no one else is here, and i am 15 feet from the router, getting speeds of 180-300

so it seems to be working fine.

thanks for the detailed info

ok, i'll try with a little more comments:

difference between above and below control - when you select frequency radio will work on you set middle frequency of the channel. When you want to use 40MHz channel instead of 20MHz, you add additional channel above or below selected channel. If you are at lower bound of allowed channels you cannot select below, because that channel is not allowed any more and radio will continue to work at previous channel width. Same goes for upper channels and above control.

selection of HT-chains:

by default radio is configured to use chain0 only. For maximum possible throughput you have to select both chains. Just note, that receive chain0 should always be selected for this card (in general, use chain0 and if require higher rates add chain1)

ok, i'll try with a little more comments:

difference between above and below control - when you select frequency radio will work on you set middle frequency of the channel. When you want to use 40MHz channel instead of 20MHz, you add additional channel above or below selected channel. If you are at lower bound of allowed channels you cannot select below, because that channel is not allowed any more and radio will continue to work at previous channel width. Same goes for upper channels and above control.

selection of HT-chains:

by default radio is configured to use chain0 only. For maximum possible throughput you have to select both chains. Just note, that receive chain0 should always be selected for this card (in general, use chain0 and if require higher rates add chain1)

Hi Janisk.

And on your previous post you says: "you can get trouble if signal strength is too high.". You could explain better.
The problem happens when both chains enabled?

Thanks.
Dzieva

if signal strength is too high your data throughput will not be good. If in your test signal is in range -40 dBm to 0 dBm then you have a problem and you have to lower your tx power to reduce it to something more usable strength -60 dBm to -40 dBm. High signal may cause self interference or even damage rx part.

You can search for more conversations about thas in this section of the forum.

I too have speed issues with the R52Hn card in a 493G Routerboard running 5.7.

I compared my laptop's Atheros AR9280 Dual Band performance on both the Routerboard as an AP and a Netgear Dual Band.

I can get 90-150Mb through my Netgear but only 30-40Mb with the Routerboard. (I am unplugging my Netgear while testing the Routerboard to avoid interference)

I think the TX rate being too high is my problem.

Only thing is, that I dont know whats a good TX Power in DB.

Should I set it to manual and try values from "17db" the default down 1db at a time until I get -40db signal strength at my laptop from 20 feet away by line of site?

If not, then whats a good guide line?

In my neighborhood, nobody is using any of the 5Ghz band. Nothing appears on inSSIDer anywhere on my property in 5Ghz so I guess I should get good performance once I dial the TX strength right.

Try setting the distance on the Advanced tab to "indoors"

I have found this change makes a huge difference when using the R52Hn as an AP.

Try setting the distance on the Advanced tab to "indoors"

I have found this change makes a huge difference when using the R52Hn as an AP.

This had a dramatic improvment, thanks

No problem

Karma !