Signal strength - Transmit Power defaults to maximum at setting 0

Discussion in 'Tomato Firmware' started by voka, Sep 11, 2013.

  1. voka

    voka Networkin' Nut Member

    Sharing my findings from my attempts to maximize router signal strength.

    I have a Linksys WRT54G (v2) and Buffalo WHR-G125 configured as AP and wireless client.

    Installed firmwares: Toastman (Tomato Firmware v1.28.7634 Toastman-IPT-ND ND VLAN-VPN) and shibby (Tomato Firmware 1.28.0005 112 ND SD-VPN) respectively.

    Found that the WEB GUI's advanced wireless setting for Transmit Power is 400 maximum, but setting 400 will not give maximum signal strength.

    Realized this when I telnet into the console and found 'wl txpwr' value is lower than if I set the Transmit Power to 0 in webgui.

    See log:

    (web-gui Transmit Power set to 400)
    root@linksys:/tmp/home/root# wl txpwr
    pwr in mw 104
    pwr in mw after override adj 104

    (web-gui Transmit Power set to 0)
    root@linksys:/tmp/home/root# wl txpwr
    pwr in mw 127
    pwr in mw after override adj 127

    Can future firmware remove the 400 cap for the Transmit Power webgui setting, if i manually try 'wl txpwr xxxxx' values, mine can go up to 1455 giving the txpwr of 1496.

    Just wondering if signal strength can be increased by any other settings?
  2. Toastman

    Toastman Super Moderator Staff Member Member

    Since these routers have a power amplifier chip that has a maximum power output of 251 mW, there is no purpose to change anything. The 1496 indication that you see has no meaning here, it is most likely the maximum power that is possible for a wireless driver to set depending on the router hardware, model number and country - don't forget there are many different hardwares both current and future, that may have been considered when setting this figure.

    The whole subject has been thrashed to death on this forum. Here are some relevant posts, you may find it interesting to read through the thread.

    Don't forget, there are two things you might do before posting for help, look in the "common tomato topics" thread, and use google.
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