Xmit Power question

Discussion in 'Cisco/Linksys Wireless Routers' started by DLB527, Jan 23, 2006.

  1. DLB527

    DLB527 Network Guru Member

    just wondering what the safe max is for this. Also ive herd that the higher the mW the worse quality wirless net will be? or something like that..

    Could some one please clear this up. Thanks.
  2. vincentfox

    vincentfox Network Guru Member

    You want your AP to reach typical client further out?

    Simple answer, get better antenna!

    It could be as simple as the home-made reflectors shown at http://www.freeantennas.com/

    A reflector improves receive gain by same amount as transmit gain. It is just as important to be able to HEAR a weak/distant client as it is for it to hear you. WiFi is 2-way communication so both directions of the conversation need to be addressed to have good communication.
  3. DLB527

    DLB527 Network Guru Member

    Oh ya forgot, I think i also read someware that its better to take off the left antenna as you will get better range that way is this true? I need as much range as possoble.

  4. DLB527

    DLB527 Network Guru Member

    well the reason i asked is it seams to get me about 25% more range when going up to about 50mW
  5. vincentfox

    vincentfox Network Guru Member

    I don't increase my transmit power at all, I put on high-gain antenna. It really is just that simple. This is 2-way radio! Does it make sense to have a 28 mW client talking to a 251 mW base station, not much really. For the minimal trouble and expense of making a reflector you will see 50-100% *real* range improvements.

    Better answer, just try it.

    I believe CompUSA was also selling reflector "kits" for $10 for those who didn't know to find the instructions online.
  6. DLB527

    DLB527 Network Guru Member

    Is this "reflector" mainly directional? I need as better range in about a 180* area.

    Also any more links and such on making one of thease reflectors?
  7. vincentfox

    vincentfox Network Guru Member

    Please, really, just try building one. It'll take you a short while with some aluminum foil, cardboard, and a ruler. Particularly the corner reflector is very easy to make.

    These things are *somewhat* directional, in radio you have to settle for focusing most of your energy in a given direction. You never get all of it. Example I have a 24 dBi dish which has a VERY narrow high-gain pattern. However I still get good signal behind and below it if I am within 50 feet or so.

    You can search on the internet all day, or you can spend less than 30 minutes making one and find out for yourself.
  8. DLB527

    DLB527 Network Guru Member

    Another question, sorry

    Is it better to leave rx and tx to auto, or will it help to have rx and tx on there own antenna? i.e. rx on right and tx on left?

    EDIT: another question :oops:

    Will it hurt any to have the router say one floor obove the laptop/computer thats useing wireless?
  9. vincentfox

    vincentfox Network Guru Member

    Hmmm, this site badly needs a FAQ for these questions. I can't tell you how many hundreds of times I've seen this question. On other sites, you just point people to the FAQ.


    If you have 2 antenna both with reflectors, just point them same direction. It makes no sense to set one for TX and one for RX as this violates the intent of the diversity mechanism used. There is only one radio in there, you think those antenna posts go to separate radios or something? No they don't. In fact, radio is half-duplex so you cannot be receiving while you are transmitting.

    I hate to refer people off-site, but the FAQ for the broadbandreports.com "Wireless Networking" forum will answer many basic questions. Linkage:

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