5 Mile Link

Discussion in 'Other Linksys Equipment' started by GeeTek, Mar 20, 2005.

  1. GeeTek

    GeeTek Guest

    Just put in a 5 mile link with 24Db antennae and a cheap brand of Access Point in Bridge mode 802.11b/g. Have plenty of signal, but very poor throughput. Turns out that standard Wi-Fi protocol has ACK (ACKnowledgement) timing fixed at a short range setting, causing the re-send rate to go way up and the available bandwidth to go down on longer links. There are a few AP radios on the market that have adjustable ACK timing to allow for multi-mile links with full bandwidth. (Cisco Aironet 1300 for example). Does anyone know of any custom firmware for the inexpensive LinkSys WAP that resolves the ACK timing issue, or of any other AP/Bridge that has this ability for less than $300 ? Thanks ! Jim. geetekjim@yahoo.com
  2. donphillipe

    donphillipe Guest

    Another question

    Where did you find information about setting this up? Where did you purchase or how did you build your antenna? Do you know if the WET11 has the same problems you identified with this AP? I have a 4 mile line of site need for a relative. Want to get something going without spending a lot of money.

  3. t4thfavor

    t4thfavor Network Guru Member

    almost all of the firmware upgrades available on this site can do aomething like this..
    i use a wrt54g
    i would recomment a wrt54gs due to its larger flash and ram more is gooderer.

    whats the terrrain like in your area..
    i would like to know i need to do a 1 mile link through forest (not very thick)

    and i would like more details
  4. jagboy

    jagboy Network Guru Member

    i didnt know michigan had forests
  5. AbNormal

    AbNormal Network Guru Member

    How thick is "not very thick"? More than 10 feet? I think you are being somewhat optimistic.

    You really do want a clear line of sight. While you can probably shoot through a single tree, a forest is simply out of the question.

    Sorry to be the bearer of bad news...
  6. oopsibrokeit

    oopsibrokeit Network Guru Member

    big fat antennas

    to do stuff like this, you need biiiiiiiiig antenna's with phat gain on them...

    stuff like http://www.stelladoradus.com/2.4.ghz.parabolic.antennas.php

    these are available worldwide and are pretty reasonably priced - my 24db antennas cost £30gbp each, i have a 2 mile not-quite line of site working at about 36mbps to a friends house.
  7. GeeTek

    GeeTek Guest

    Re: Another question

    Sorry to be taking 2 months to reply. I was away for awhile. The radio I use is D-Link DWL-2100AP and 24 Db Grid antennas. The radios are < $100 ea. and the antennas are about $55 ea. Use the antennas at horizontal polarity for improved interferance resistance.

    Telnet into the Ap and issue these commands.

    set super g disable
    set wireless mode 11g
    set rate 0.25
    set super g enable

    Now when you enter the command "set rate" the list of available baud ratres will include the rates 0.25 and 0.5, indicating that the radios are in extended range mode. Recent loop testing shows actual throughput between 15 and 18 Mb over my 4 mile link at the 48 MB setting in the radio. Tower to tower Ping times are a continuous string of 1ms.
  8. GeeTek

    GeeTek Guest

    More info

    My link is actually 4.3 miles, not 5 or 4. My line of sight is perfect. Towers both 65' above avarage terrrain with no tree blockage. (Del Rio Texas, tallest tree = 16 feet). I purchased the antenna from Hyperlinktech.com with custom terminator RP-SMA to fit the D-link radio. You can order the antenna with the N-connector and buy an adapter for less than they charge for the RP-SMA connector installation. Here is the link to the antenna.


    The outdoor boxes are these ;


    Shop around for the Radios. Tiger Direct will sell you refurb hardware without telling you. I have good luck with newegg.com

    I wired the tower with 110v and put in venting ports with PVC pipe and a 110v muffin fan from Radio Shack. Up-Time has been 100% 24/7 since my first post. :D
  9. JingYou

    JingYou Network Guru Member

    hi i have a home antenna ontop of my roof which i used to receive television channels, but now i am on cable and its up on my roof useless, doing nothing. i was wondering if i could use it as my router's antenna? i'm using linksys WRT54g, and would like to know if there are specially made cables for me to connect my wrt54g into the TV/RADIO at the wall which link its way up to my roof's antenna? Please advice, post a link on the special made cable or anything helpful.
  10. t4thfavor

    t4thfavor Network Guru Member

    nope the antenna you have is onthe wrong frequency for the 802.11 standard
    it will not work as is.
    i am somewhat sure that if you wanted to cut it up you could use pieces of it for the antenna for the ap

    as for me i have also been away for some time.
    the forest i have is very wide. just not thick. it has small twigs and stuff.

    i still dont think it will work.

    but hey im optomistic
  11. Zlatnia

    Zlatnia Network Guru Member

    Great question GeeTeek!

    Hey guys , everybody look for that option ACK or the similiar in Linksys firmwares. It will be in great help for me and I think for many more people. I use Linksys WRT54Gs to do a long distance connection and that devices are great. I use it in very rood environment, winter -15 C, right now - pouring rain and everything is working great. And the only thing that I need is the ACK adjustement becose of covering longer distances.
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