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Changing Signal Strength

Discussion in 'Sveasoft Firmware' started by JohnRChick, May 5, 2005.

  1. JohnRChick

    JohnRChick Network Guru Member

    Hey. I just upgraded to the new Satori firmware on my WRT54G. Im wondering if increasing the signal strength would provide any more coverage or performance. If so, how much would much could i safely increase it to?

  2. jagboy

    jagboy Network Guru Member

    in satori the limit is 84 i am pretty sure you can go 84mw. i am using dd-wrt which is much better and i am using it at 120 mw. yes increasing it will imporve signal strength but might diminish the quality of the signal like a dirty signal
  3. gotamd

    gotamd Network Guru Member

    It should increase the range and increase the reliability of the signal in places where the connection is a little iffy right now. You're probably safe upping it to the 40-50 range and maybe more, though I'm not sure exactly where it starts to become risky. I've run mine for extended periods of time at 45 with no problems.
  4. jagboy

    jagboy Network Guru Member

    fyi if you need help finding the xmit power option it isshown below.

    (ps i think dd-wrt is a better option)

  5. bigclaw

    bigclaw Network Guru Member

    I'm always curious about the theory behind such transmit power boosts. If this only boosts the one-way power with which the router emits signals, how does it improve overall connection strengths since the wireless NIC's signal may still be too weak to come back to the router. Does increasing transmit power somehow improve the router's ability to "hear" signals sent by wireless NICs as well?

    Of couse if the original limiting factor is the router to begin with, and wireless NICs are already capable of sending signals back to the router from a greater distance, the benefit of such router power boosts is apparent. But somehow it's hard to believe that's the case.
  6. jagboy

    jagboy Network Guru Member

    i dont know the anwser ot the quesiton but hey it works it works

    it might beter the hearing of the signal and transmitting power
  7. davidsonf

    davidsonf Network Guru Member

    You pretty much have the right idea. If, and only if, the transmit path from the AP to the Client is has too weak a signal, will increasing transmit power from the AP help.

    In practice that does happen though. But it is not likely to be seen as improved range, so much as just fewer problems at the maximum range. In most cases, for example if the connection is getting 54Mb rates, it simply isn't going to do anything.

    Note that 3 dB is twice the power. It usually takes about 6 dB to double the range. Since increasing the AP's transmit power does not help the AP receive any better, there is a very practical limit to any benefits. A 3 dB increase (56 mW) probably does provide a measurable increase in fade margin, and if you often work at fringe ranges it might be worth doing. 6 dB (112 mW) is almost certainly not significant over just 3 dB.

    I tend to set mine a 56 mW, though I have used 84 mW too.
  8. aaronamd

    aaronamd Network Guru Member

    I would say go as high as you want, but keep an eye on how much heat the router is putting out, you can fry your poor WRT like that if you increase it too much. It's always better to get stronger anntenae because you will have much better signal quality that way. it's really worth spending the money!
  9. zgamer

    zgamer Network Guru Member

    I've played around with a bit along with some other antennas. When using the stock antennas and upping the output I could see more access points/routers when doing a site survey....which is good for channel selection(to keep interference to a minimum) but when upping it to a higher output the only benefit was that if I could see the router and send to it from my laptop but I have some problems with the response from the router, this would fix it. Essentially when you up the power in ups the routers response to your laptop, however when the laptop sends the signal if it fails sending it doesn't help any. What this will also help is if you currently have a weak signal and you up the output it will help ensure a reliable connection....assuming you don't up it to insane amounts with the stock antennas.

    When using larger after-market antennas(pair of 9db Comp USA omni's...they were cheap:p ) I would find that my overall coverage area increased to a point, however when I would up the output some the coverage area both-ways is better. This would suggest that if one swaps the stock equipment out with larger equipment and wishes to maximize the range they would need to up the output in order to fully utilize the larger equipment. Basically if you get a big antenna that physically has a bigger antenna in the inside you'd need to up the output to have the same signal strength throughout the antenna....you up one, you up the other.

    As far as how to do it for any situation, I do not know. I know that the stock is 28mw and the stock antennas are 2.5db(if memory serves) each.

    Another place for some more general information....found this after typing was Wifi Faq
  10. aaronamd

    aaronamd Network Guru Member

    do the compusa antennea work well? I'm thinking about upgrading. I am glad that you got it to work!
  11. J_Man61

    J_Man61 Network Guru Member

    i was at staples and they have $80 linksys antennas. are they alot better since they just about cost more than the router itself
  12. aaronamd

    aaronamd Network Guru Member

    I'll look into those, thanks!
  13. Crashmaxed

    Crashmaxed Network Guru Member

    Insane p0wer output

    I've had mini wifi-box.net have option up to 254mw but who in the world would be crazy enough to do that much? I've only jacked mine to around 80mw.

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