External Antenna - Poor Speeds

RouterOS Wireless Networking
1

I have RB751U-2HnD and a Dipol Omnidirectional 6-9dBi MMCX antenna.

I’ve attached the antenna to the router and changed Antenna Mode to: antenna b.
If a check my internet speed at http://beta.speedtest.net/ I get 24Mbps at best. 7 of 10 the speed is less than 10Mbps.
My external line is 300/50Mbps. If I plug cable directly into my computer speed will to to 270Mbps, so I know everything is ok with my ethernet connection.

Am I missing something?

Other data:
MTU: 1500
L2 MTU: 1600
Band: 2Ghz only-N
WIFI: 2.4ghz
Channel Width: 20MHz
Frequeny: 2417 (Channel 2)
Wireles Protocol: 802.11
Encryption: WPA2 AES
Frequecy Mode: superchannel
Antenna Gain: 0
Tx Chains: Chain0 & Chain1 (I’ve tried every combination)
Rx Chains: Chain0 & Chain1(I’ve tried every combination)
Tx Power Mode: card rates
Tx Power: 17

On “Current TX Power” tab “rate” value goes from 1Mbps to 54Mbps.
Oh and the router is in IKEA PS Cabinet (http://www.ikea.com/gb/en/products/storage-furniture/cabinets-sideboards/ikea-ps-cabinet-white-art-10251451/). That’s why I need external antenna. I thought It would have solved my problem.

2

Try using the extension channel (40 Mhz), use wpa2-aes only for encryption and enable wmm.

If I understand correct, you’re using one antenna, that’s only one chain:
https://superuser.com/questions/744065/what-is-an-antenna-chain-and-how-do-i-figure-out-the-correct-setting-for-my-rout

3

I am already using WPA2-AES. I use 20MHz width because I’ve read some articles where It says 40MHz is not so good for 2.4MHz WIFI.
Oh and the router is in IKEA PS Cabinet (http://www.ikea.com/gb/en/products/storage-furniture/cabinets-sideboards/ikea-ps-cabinet-white-art-10251451/). That’s why I need external antenna. I thought It would have solved my problem.

4

RB751 external antenna was not very good, it will not improve the situation. What is the signal right now, without the antenna?

5

Signal strength is normal, but speed is 4Mbps (out of 300Mbps). The problem is also that I am not sure which antenna is transmitting. Is there a way to disable all internal antennas?

6

please post specific signal info

for example, from the registration table entry on my device, which has excellent signal (same model as yours):

Last Activity		0.000 s
Tx/Rx Signal Strength		-46 dBm
Tx/Rx Signal Strength Ch0		-48 dBm
Tx/Rx Signal Strength Ch1		-53 dBm
Tx/Rx Signal Strength Ch2		-54 dBm
Signal To Noise		59 dB
Tx/Rx CCQ		100 %
P Throughput		30502 kbps
7 



/interface wireless registration-table> print 
 # INTERFACE                                                              RADIO-NAME       MAC-ADDRESS       AP  SIGNAL-STRENGTH TX-RATE UPTIME              
 0 WLAN                                                                                    					 no  -28dBm@1Mbps    11Mbps  1m15s               
 1 WLAN                                                                                    					 no  -67dBm@1Mbps    39Mb... 1m12s    

/interface wireless registration-table> print oid           
0 signal-strength=.1.3.6.1.4.1.14988.1.1.1.2.1.3.232.78.6.49.128.202.6 tx-signal-strength=.1.3.6.1.4.1.14988.1.1.1.2.1.19.232.78.6.49.128.202.6 
tx-bytes=.1.3.6.1.4.1.14988.1.1.1.2.1.4.232.78.6.49.128.202.6 rx-bytes=.1.3.6.1.4.1.14988.1.1.1.2.1.5.232.78.6.49.128.202.6 
tx-packets=.1.3.6.1.4.1.14988.1.1.1.2.1.6.232.78.6.49.128.202.6 rx-packets=.1.3.6.1.4.1.14988.1.1.1.2.1.7.232.78.6.49.128.202.6 
tx-rate=.1.3.6.1.4.1.14988.1.1.1.2.1.8.232.78.6.49.128.202.6 rx-rate=.1.3.6.1.4.1.14988.1.1.1.2.1.9.232.78.6.49.128.202.6 
routeros-version=.1.3.6.1.4.1.14988.1.1.1.2.1.10.232.78.6.49.128.202.6 uptime=.1.3.6.1.4.1.14988.1.1.1.2.1.11.232.78.6.49.128.202.6 
signal-to-noise=.1.3.6.1.4.1.14988.1.1.1.2.1.12.232.78.6.49.128.202.6 tx-signal-strength-ch0=.1.3.6.1.4.1.14988.1.1.1.2.1.13.232.78.6.49.128.202.6 
signal-strength-ch0=.1.3.6.1.4.1.14988.1.1.1.2.1.14.232.78.6.49.128.202.6 tx-signal-strength-ch1=.1.3.6.1.4.1.14988.1.1.1.2.1.15.232.78.6.49.128.202.6 
signal-strength-ch1=.1.3.6.1.4.1.14988.1.1.1.2.1.16.232.78.6.49.128.202.6 tx-signal-strength-ch2=.1.3.6.1.4.1.14988.1.1.1.2.1.17.232.78.6.49.128.202.6 
signal-strength-ch2=.1.3.6.1.4.1.14988.1.1.1.2.1.18.232.78.6.49.128.202.6 

1 signal-strength=.1.3.6.1.4.1.14988.1.1.1.2.1.3.132.56.53.81.78.122.6 tx-signal-strength=.1.3.6.1.4.1.14988.1.1.1.2.1.19.132.56.53.81.78.122.6 
tx-bytes=.1.3.6.1.4.1.14988.1.1.1.2.1.4.132.56.53.81.78.122.6 rx-bytes=.1.3.6.1.4.1.14988.1.1.1.2.1.5.132.56.53.81.78.122.6 
tx-packets=.1.3.6.1.4.1.14988.1.1.1.2.1.6.132.56.53.81.78.122.6 rx-packets=.1.3.6.1.4.1.14988.1.1.1.2.1.7.132.56.53.81.78.122.6 
tx-rate=.1.3.6.1.4.1.14988.1.1.1.2.1.8.132.56.53.81.78.122.6 rx-rate=.1.3.6.1.4.1.14988.1.1.1.2.1.9.132.56.53.81.78.122.6 
routeros-version=.1.3.6.1.4.1.14988.1.1.1.2.1.10.132.56.53.81.78.122.6 uptime=.1.3.6.1.4.1.14988.1.1.1.2.1.11.132.56.53.81.78.122.6 
signal-to-noise=.1.3.6.1.4.1.14988.1.1.1.2.1.12.132.56.53.81.78.122.6 tx-signal-strength-ch0=.1.3.6.1.4.1.14988.1.1.1.2.1.13.132.56.53.81.78.122.6 
signal-strength-ch0=.1.3.6.1.4.1.14988.1.1.1.2.1.14.132.56.53.81.78.122.6 tx-signal-strength-ch1=.1.3.6.1.4.1.14988.1.1.1.2.1.15.132.56.53.81.78.122.6 
signal-strength-ch1=.1.3.6.1.4.1.14988.1.1.1.2.1.16.132.56.53.81.78.122.6 tx-signal-strength-ch2=.1.3.6.1.4.1.14988.1.1.1.2.1.17.132.56.53.81.78.122.6 
signal-strength-ch2=.1.3.6.1.4.1.14988.1.1.1.2.1.18.132.56.53.81.78.122.6
8

Still having the problem …

9

hello,
looks like client device is stuck at 802.11g rates. please send us supout.rif file to:
support@mikrotik.com