View Full Version : [ubuntu] Very weak wireless signal from the ndiswrapper driver (realtek 8187)

March 11th, 2009, 10:31 AM
The wireless signal of my wlan (realtek 8187) is very weak in ubuntu. When my notebook is away from the router more than 3 metres the connection is broken.

I put my router right beside my notebook and do the ping test in windows xp and ubuntu for comparison[package size is 64bytes in both os]. The response time in xp is 1ms and 30ms for ubuntu.

Is that because of the low transmission power of the wlan in ubuntu? How can I turn it up? Is there anyway to boost up the signal? Many thanks!

wlan0 IEEE 802.11bg ESSID:"router"
Mode:Managed Frequency:2.457 GHz Access Point: 00:23:45:1a:56:31
Bit Rate=54 Mb/s Tx-Power=27 dBm
Retry min limit:7 RTS thr:off Fragment thr=2352 B
Power Management:off
Link Quality=39/100 Signal level:56/65
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

coppen@coppen-laptop:~$ iwlist scan
wlan0 Scan completed :
Cell 01 - Address: 00:19:5B:DF:63:DA
Frequency:2.457 GHz (Channel 10)
Quality=43/100 Signal level:52/65
Encryption key:on
IE: WPA Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
48 Mb/s; 54 Mb/s
Extra: Last beacon: 8ms ago