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Thread: Very weak wireless signal from the ndiswrapper driver (realtek 8187)

  1. #1
    Join Date
    Oct 2007
    Location
    hk
    Beans
    707
    Distro
    Ubuntu 7.10 Gutsy Gibbon

    Very weak wireless signal from the ndiswrapper driver (realtek 8187)

    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!



    Code:
     iwconfig
    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
                        ESSID:"homerouter269"
                        Mode:Master
                        Channel:10
                        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:tsf=0000001b23f49179
                        Extra: Last beacon: 8ms ago
    
    coppen@coppen-laptop:~$

    MANY THANKS!
    Last edited by afeasfaerw23231233; June 13th, 2009 at 06:40 AM.
    Ubuntu 7.10 on P4 1.8G and PIII 933mHz

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