mW power..need clarification

Discussion in 'Tomato Firmware' started by fearz, Jul 26, 2012.

  1. fearz

    fearz Serious Server Member


    I have a problem with wireless range in my house, 2.4 & 5 GHz! I feel the router should deliver very much wider coverage...also I don't think the 5GHz is delivering bandwidth speed as it should...the maximmum i got while transfering data (450Mb to 450 Mb) is 6 MB/sec...Thats between my MBP late 2011 & Mac mini 2012!

    I bought the RTN66U from the US and I live in Egypt, I tried setting mW from 100 to 500, no gains...

    Can someone explain the mW / Transmit Power, how it works? is it safe? can raising it too high damage the router / wireless signal?

    What settings should I set to have the maximum wireless range?

    Does setting the country / other countries affect this subject?

    Using 097 by Shibby...

    Thank you all in advance...
  2. ntest7

    ntest7 Network Guru Member

    The more mW, the stronger the signal. You won't damage the router or fry your eyeballs regardless of the setting used since both the transmit chip and driver have built-in hard limits.

    The country you select silently limits the max power available, and may also affect which channels are available. I've heard Singapore is pleasant this time of year.

    The 5GHz band is far more sensitive to walls and other obstructions, and generally has less range.

    I don't have that model router, but I get very nice results with other Asus routers by setting the power to "0" zero for the driver default, which is apparently max power.

    Also, these are very low power signals, and are easily affected by interference such as other wifi routers, microwave ovens, cordless phones, baby monitors, etc. Sometimes you can get better results by changing channels, even if nothing shows up on the "bad" channel.
  3. mraneri

    mraneri Network Guru Member

    Too much power can cause linearity problems and slow your thruput (due to retransmitted packets). The best power for bandwidth is not always the highest power.
  4. Toastman

    Toastman Super Moderator Staff Member Member

    When using the ND, RT, RT-N drivers, maximum power is reached with a setting of approximately 60 on all routers I ever tested. Increasing it beyond that figure will make no difference.

    Also, remember that there is not a linear relationship of signal strength to power. Doubling the power gives 3dB increase in strength. Using most wireless card's RSSI indicators this might not even be noticeable.

    "0" is supposed to allow the wireless driver to set the power that is legal in the country that you've selected. Many people find this best, others find 60 is best. However, some people have reported different throughputs with different transmit power settings.
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