RF output danger level??????

Discussion in 'General Discussion' started by bxtesters, Dec 6, 2005.

  1. bxtesters

    bxtesters Network Guru Member

    Me and my buddies are pretty new to this site as well as ths firmware stuff.
    Gave my equipment hyper wap firmware and it works great.
    Now we would like to jack up the antenna output, it goes up to 251 mw.

    can i run that in my home or is that to dangerous, should it be for uotdoor use if i jack it up that high?

    ALso can i broadcast on the added channels.

    Sorry for the stupid question but like i said im new.

    Any help would be much appreciated
  2. PrimalScream

    PrimalScream Network Guru Member

    Until someone that understands more about RF than I do give us some input (because I know very little), I'll tell you what I think.

    I don't crank the power up that high because I've read that there are heat issues... unless you attach some kind of additional heat dissapation. I am running mine at 100% (~87mw) and the unit remains relatively cool.

    I also have all signals routed to one outdoor antenna about 75' from my house. This is where I have a small tower set up that has various other antennas already attached (t.v., etc.) and keeps me from flooding my house with very strong RF. I have a small child and a pregnant wife and don't want to do anything to endanger their health.

    So, maybe someone with real knowledge will jump in and enlighten us. In the meantime, I would rather be safe than sorry.

    Good post though. I've often wondered about this myself.

  3. danielhaden

    danielhaden Network Guru Member

    To broadcast on the other channels, you will need 1 WRT54G/GL/GS and three WAP54G. Plug all of the WAP54G into the computer ports. Set everything to the same SSID and same wireless security. Use channels 1, 4, 8, 11 because they must all be on seperate channels. Use IP addresses,,, and because they must all have seperate IP addresses.

    Maximum broadcast power for wireless "G" is 168 MW.
    Maximum broadcast power for wireless "B" (slow) is 215 mw
    The latest HyperWRT from Tofu and Thibor provides this as a manual setting. DD-WRT also provides this possibility.

    This level of power is pointless/useless in connecting to a computer. It is to be used in WDS, WET, and backhaul links. Power of 84mw is far higher than you will need if you want to provide a connection to a computer.
    This is because the communication is bi-directional and the client device/computer needs just as much power as the wireless router.

    You can get there with a directional antenna such as the Hawking corner reflect (100 feet) a cantenna (300 feet) a Vagi (500 feet) a yagi (700 feet) or a dish (10 to 83 miles). Many factors affect these figures, such as others nearby operating on the same channel and the fresnel effect of antennas. You may make a homemade dish out of an old PrimeStar antenna by switching the feed horn for a wifi antenna. You can home-brew this with a soldering iron or just glue an economy panel antenna right on the nose. ;)

    Another word about antennas. It is always more important to have a strong antenna on the client because the client device/computer usually has the weaker electronics.
  4. PrimalScream

    PrimalScream Network Guru Member

    Thanks danielhaden.
  5. PrimalScream

    PrimalScream Network Guru Member

    BTW, you are right about the 2-way communication. I increased my end with power, strong antenna, etc. and had no problem really getting the signal out, and although a distant client could see it, the connection was unusable. This was easily fixed by also beefing up the client side.

    Cheers! :)
  6. danielhaden

    danielhaden Network Guru Member

    Cool! After working with this stuff for a while, my first try is always putting a directional antenna of some sort on the client side.

    Your distant client. . .How distant? I'm just curious. . .
  7. PrimalScream

    PrimalScream Network Guru Member

    There a several. The first one is about 1/2 mile... the others, about 3/4 mile, were beefed up as they were installed.
  8. Cancan

    Cancan Network Guru Member

    How do you beef up the power/antenna on the client side? I have an internal wireless on my laptop. Is there a way to adjust or maximise these settings on a Windows XP Pro machine?
  9. NateHoy

    NateHoy Network Guru Member

    Some wireless NICs have power adjustments that allow you to boost power.

    Whether you want one of those "boosted units" sitting on your lap is your call (perhaps you should involve your significant other in that discussion if you have any thoughts of having kids any time). ;)
  10. crawdaddy

    crawdaddy Network Guru Member

    I live directly in one of the lobes of my 15db omni antenna on my roof. I'm running 80mw with the intention of moving up to a full watt soon. I have not experienced any side effects living in the lobe. So I'd say it's fine.
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