5ghz channel - power differences

Discussion in 'Tomato Firmware' started by Hogan773, Jan 14, 2012.

  1. Hogan773

    Hogan773 Networkin' Nut Member

    Hi all - so I have been rocking my E3000 for about a month and fighting through the 2.4ghz soup in my neighborhood. Getting cruddy up and down performance from my Intel WifiLink 1000 in the laptop.

    Just got an Intel 6205 to allow me to fly high up into the 5ghz band. Seems to work! Although sometimes the connection just decides to max to 150mbps rather than 300?

    Anyway - re: BEST CHANNEL for 5ghz. My neighborhood is WIDE OPEN (yay!) on all channels. So I am reading and googling and see some people saying that the UPPER channels (161 etc) give a much better range thru the house because they allow 20 TIMES the power vs the lower 36, 40 etc channels.

    My question is: from a hardware/burning out my E3000/etc standpoint, is there any reason NOT to roll in the 161 channel? I seem to get good throughput in channel 36 (again since my neighborhood is quiet on 5ghz). Does the 161 really transmit at 20x the power? Does that make my "overheat-prone" E3000 more prone to killing itself over time?

    Just curious and you guys will know the answer I'm sure.......thanks
  2. Toastman

    Toastman Super Moderator Staff Member Member

    I think some of the posters you've been reading have been swigging wood alcohol or something. Just do what you need to and do not worry about the E3000 exploding. It won't. Use the channels that seems best to you.
  3. Hogan773

    Hogan773 Networkin' Nut Member

    I now see why my neighborhood is "wide open" in terms of 5ghz.....because the signal peters out so much more quickly. As I was walking up the stairs and away from the router with the laptop I could literally see the signal weakening with every step according to the reported connection speed and InSSIDER. 10 feet away and I was connecting at 300mbps. By the time I made it up to the bed, its lucky to connect at 40.

    Now the good news is even though it connects at only 40, because the channel is clear it can still give better throughput according to speedtest.net (15-20mbps which is pretty close to my wired internet speed) vs 2.4G which often just gets 4-6 mbps because of all the damn noise.

    What do you think is the maximum power at which I can run the 5G radio? According to the DDWRT pages it seems like near 20dbm according to Linksys for the E3000 (there are lower levels for for "high rates" vs "low rates". Should I just stop at 65 mw or can I crank up the 5ghz radio to 100mw (or 251?) Will it make a difference? Will it burn out the chip?
  4. Toastman

    Toastman Super Moderator Staff Member Member

    I don't recall anyone doing any measurements on 5GHz. Currently I don't have a 5GHz client, but next time I have access to one, I will do some power v. signal strength tests. In the meantime, you'll have to try it yourself. The output power of 5GHz is only around half that of 2.4GHz. What the txpower settings mean is open to question, just consider it as a relative number is best.
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