Increase gain in Linksys dd-wrt repeater

Discussion in 'PC Hardware' started by freejazz, Jan 24, 2015.

  1. freejazz

    freejazz Guest

    Hi, i have the Linksys in subject with my dd-wrt installed. I
    activated Repeater function and works fine. Then i tried to take
    the tx power to 2000mW and i attached an Alfa antenna mod. APA
    M04 with only scotch tape and the signals i received from outside
    are more strong.
    Now i would want increase the gain to receive and which antenna do
    you suggest me....that i can plug in router connector as well...
    :lol:

    I tried an Alfa AWUS036H with my notebook but i noticed many
    issues to receive station or to switch the router feature...and
    the notebook should be turned on as well.
    Any suggestion??
    --
    'zaFo'!
    sent from Android mobile phone - Rome, Italy


    ----Android NewsGroup Reader----
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    freejazz, Jan 24, 2015
    #1
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  2. Not able to answer your actual question, but wanted to mention, if you
    raise the transmitter power level higher than the default setting in
    DD-WRT you may need to include a cooling fan. Without a fan it might
    work for days or possibly weeks but it will usually fry when you need to
    use it the most.

    Usually the default power setting given was the factories method of
    keeping the unit working without needing a fan to keep from overheating
    the transmitter.
     
    GlowingBlueMist, Jan 24, 2015
    #2
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  3. freejazz

    Paul Guest

    There are apparently "Fake" Alfa products as well as real ones.
    Check to make sure the Alfa is a real one. This is the internals
    of AWUS036H compared to a Chinese "fake".

    http://ts3.mm.bing.net/th?id=HN.607990270876844962&pid=15.1&P=0

    And if you need an antenna, go big like these guys. I'm sure
    their EIRP is not in violation of the unlicensed spectrum
    usage rules :) Yagi and parabolic antennas are available in
    the 22dBi to 30dBi region, but they have a beamwidth of 6 degrees
    and are difficult to point properly. Microwave repeater systems
    are like that too, hard to point properly, and when the wind blows,
    the antenna can be twisted off-axis causing signal loss. Too much
    antenna gain is not a good thing, because of the directional
    aspects.

    http://wireless.ictp.it/school_2006/lectures/Rob/diy-antennas/pix/shootout.jpg

    Paul
     
    Paul, Jan 25, 2015
    #3
  4. freejazz

    freejazz Guest

    Thank you so much for your informations.
    This is first time i use this product with modified firmware. I'll
    read more to know better.
    I wonder if there is a proper model fan for this well-known
    product with its modifies.

    --
    'zaFo'!
    sent from Android mobile phone - Rome, Italy


    ----Android NewsGroup Reader----
    http://usenet.sinaapp.com/
     
    freejazz, Jan 25, 2015
    #4
  5. freejazz

    freejazz Guest

    Is the fake is on the right?
    I have just bought an Awus036nhr v2 and seller gas guaranteed me
    to be an original one.
    It seems that the hologram is not enought to certicate the
    original product. Only one way is to ask to Alfa manufacturer
    confirm for that serial no. and mac.
    I used an AWUS036H for few day but o had very disappointing
    results although i have the hologram.
    I cannot open device because tomorrow I will send back it to seller.
    Yeah. Thanks Paul.
    Then you should find a good quality directional antenna as well
    although all things you said are true.
    However for these operative conditions once you point properly the
    antenna i thing that is only solution to gain signals from one
    station and meanwhile attenuate disturbs from other directions.
     
    freejazz, Jan 25, 2015
    #5
  6. freejazz

    freejazz Guest

    Is the fake is on the right?
    I have just bought an Awus036nhr v2 and seller gas guaranteed me
    to be an original one.
    It seems that the hologram is not enought to certicate the
    original product. Only one way is to ask to Alfa manufacturer
    confirm for that serial no. and mac.
    I used an AWUS036H for few day but o had very disappointing
    results although i have the hologram.
    I cannot open device because tomorrow I will send back it to seller.
    Yeah. Thanks Paul.
    Then you should find a good quality directional antenna as well
    although all things you said are true.
    However for these operative conditions once you point properly the
    antenna i thing that is only solution to gain signals from one
    station and meanwhile attenuate disturbs from other directions.
     
    freejazz, Jan 25, 2015
    #6
  7. freejazz

    Paul Guest

    Purchase an antenna locally. Look for something
    with relatively solid construction.

    The thing is, for 2.4GHz operation, the antenna requirements
    are not as difficult to meet as for a TV antenna (which is a
    broadband device working on more than one band). If you look
    at the Yagi antennas for Wifi, the element length and spacing
    seems to be almost the same for all elements. Even if the
    manufacturer cannot saw the elements off to the correct length,
    the antenna will still have tremendous gain. If it says 30dBi,
    you're likely to get at least 15dBi from it, even if it is
    built by purely incompetent people.

    The only thing to watch for, is "Pringles Can antenna" or
    Cantenna. It is possible to make those work, but some
    of the plans on the Internet for those, have wrong dimensions.

    Antenna designers on the Internet, use programs like 4NEC2 to
    verify antenna designs, and predict performance. I don't think
    4NEC2 would necessarily be the best program for verifying
    the dimensions on a Cantenna, but you need to find a
    design which has been verified by an expert, before wasting
    time on such a thing.

    Even the BestBuy has Wifi antennas, well hidden on their
    web page. That's a 24dBi TP-Link antenna. The connector on
    the end won't be the one needed, and tracking down an
    adapter cable solution will also be a chore.

    http://www.bestbuy.ca/en-CA/product...antenna-tl-ant2424b-tl-ant2424b/10219157.aspx

    http://www.tp-link.com/en/products/details/?model=TL-ANT2424B

    Dimension 1000mm x 600mm (39.37 inch wide, 23.6 inch high)
    Beamwidth 10 degrees one axis, 14 degrees other axis

    If you are sitting in a small room, this will take up major
    space. But it is a powerful antenna. And the lobe should
    point out the front of the antenna (no gain on the back side).

    HTH,
    Paul
     
    Paul, Jan 25, 2015
    #7
  8. freejazz

    freejazz Guest

    I'm agreed with you but i think that is much better to look for a
    better constructive quality materials one.
    I read about this "Cantenna" by Napleswireless.net and few years
    ago i constructed a little one to apply on antenna of router to
    direct waves and effectively the gain increased a bit but wasn't
    enought for my needed.
    Yeah, thank you Paul for your links.
    I think that the ANT2424B TPLink with 24dB should be a good
    antenna to get my goals.
    On the market exists an identical antenna producted by Telcom
    (24dB) and i think that is only a change of brand..
    I read about a Tp 5210gamplifier receiver, ap/router and all
    direction antenna with 12dB gain that you can adapt with
    Gregorian antenna you suggested me.
    I wonder is 12dB gain of amplifier will be add at Gregorian antenna.
    I suppose that's not. The Gregorian will exclude internal
    antenna's Tp 5210g...
    --
    'zaFo'!
    sent from Android mobile phone - Rome, Italy


    ----Android NewsGroup Reader----
    http://usenet.sinaapp.com/
     
    freejazz, Jan 26, 2015
    #8
  9. freejazz

    Paul Guest

    The output power, takes into account the antenna gain.
    As the rating is EIRP. EIRP is how the unlicensed wireless
    specification is set up. The more gain the provided antenna
    has, the less power the RF transmitter could have, in order
    to stay within the EIRP power limit. That is done, so that
    the lobe of the transmitted signal (out in front of the antenna),
    stays at a legal power level.

    http://www.tp-link.com/en/products/details/?model=TL-WA5210G#spec

    If you buy a product that comes with a weak antenna, then
    slap on an antenna with huge gain, that gives you an illegal
    power level right out in front of the antenna. And that's the reason
    for using the fancy antenna. Knowingly exceeding the EIRP by
    using an antenna with gain. You unscrew the 2dBi stick antenna
    and connect the 24dBi antenna in its place.

    Note that companies can sell gear intended for commercial usage
    (in a mall), with power levels above the unlicensed value, but then
    you just apply for a license to use the equipment. It makes you
    visible to the government.

    That's why these requests for fancy antennas are funny, as the
    owner of the antenna will truly be able to claim they
    don't know what an EIRP is, and they could not possibly
    know the power level was at the license-required level out in
    front of their antenna. Since our society triggers most
    things based on "complaints", if you disrupt the Wifi of
    your neighbors with your contraption, that's when the
    Department of Communications comes looking for the source.
    They would not normally check the transmit power level out
    in front of your antenna, just for fun. As the 2.4GHz band
    is already a mess, and it serves no purpose to patrol the
    entire city looking for parabolic dishes. But if a neighbor
    spots your parabolic antenna, and their Wifi stops working
    as a result, you are the first person they will blame.
    (Even if it is not your fault.) Just like they blame a
    Ham Radio operator here, if their TV doesn't work. Even if
    the Ham Radio operator no longer has a transmitter hooked
    to the antenna tower outside their home. The Ham Radio
    operator is the first person to receive a visit from
    the government.

    Paul
     
    Paul, Jan 26, 2015
    #9
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