Hi,
i am very long time trying to get best from new 802.11n technology using Mikrotik. There is very noticeable improvement in version 5.4 generaly. It looks like it has better CCQ and holds higher data rates. Looks like it better understands what other site sends.
Using 2x433AH + R52Ncards + very perfect 24dB and good isolated dual polarisation antenas.
All tests done on simple way :
local WWW server ↔ 433AH AP<-> 433AH Client<-> PC just using multiple http downloads
Signal 47/48dB
Run short ping 100x second before each test to get the best wirelles rate, than stoped and run the download test
The best what i can achieve is with 40MHz channel, using nv2 and single chain. It makes 100/100CCQ and holds rock solid 150/150Mbit (before 5.4 just 130/130 in nv2). The download speed comes to 68-83Mbit and looks to be good.
Any other combination was not able to run as fast. Dual chain 40Mbit channel has poor CCQ just over 40/40, and even at modulation speeds 300/300Mbit is not able to deliver more than very unstable 28-48Mbit.
I realy dont know what iam doing bad, because i was not able to achieve good resluts on dual chain outdoors. The single chain is always more stable and has more troughput. Many locations even 50km away, and always the same result.
Technical parameters
Frequency range 5,45 - 5,9 GHz
Gain 23,6 ±0,6dBi
VSWR ≤ 1,5
Isolation between connectors 53dB (≥50dB)
Front to back ratio ≥ 38 dB
Beamwith-3 dB 9°
Connector N - Female - JRC-24DuplEX
R-SMA - JRC-24DuplEX-SMA
Polarization linear, horizontal and vertical
Parabola ø 38 cm
aluminium alloy with baking colour
Cover UV steady plastic ABS
Instalation for mast ø 27 - 74 mm
I already watched videos from MUM Hungaria, and tryed lower down the output power
10dB fixed results in lost off cca 5% troughput
5dB fixed results in lost off cca 10% troughput
0dB fixed results in lost off cca 20% troughput
The signal level for both chains is simetrical. (nearly the same)
Just an idea: Is it possible it want work right with extra 40Mhz wide channel? Ill try it with 20Mhz tonight. Is there some difference on R52N cars usinf MMCX or UL-F output connector? We use MMCX
But like i said, i was never able to get stable link speed using dual chain.
2 dallas: And how do you test it ? If you use the BTest on Mikrotik 2 Mikrotik makes 120MBit udp simplex on single chain on my setup - this is irelevant. If i use BTest on dual chain it makes over 240Mbit siplex or 117Mbit duplex but again UDP BTest is irelevant. The troughput is different from this.
2 Dallas: You are still talking about theretical troughput readed from some testengine. Try to download some real files trough this link. You will see the difference.
I did bandwidth test udp half duplex via the wireless card. We are only talking about 802.11n, not the throughput of the board going through the ethernet port.
I think what he is getting at is that the built in BW test isn’t the most accurate test method. You really need to set up two PC’s on either end of the link and run an IPperf test across it to get accurate link capacity.
