How to Increase Antenna Range

Discussion in 'Antennas' started by alimp5, 25 Mar 2013.

  1. alimp5

    alimp5 Active Member

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    hi hi hi
    i have TP-link 7200 ND 500MW
    but my signal is very bad
    i cant get better signal in range. but my wireless laptop is very better.
    please help me for build homeMade antenna
    see pics
     

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  2. Gordon

    Gordon Member

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  3. alimp5

    alimp5 Active Member

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    any body here??? for help to me????
     
  4. Gordon

    Gordon Member

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    if your 500 MW TP-link card is not as good as your 50 MW laptop you have a hardware problem.
    A couple of possibilities:
    1. Bad antenna
    Unscrew from RP-SMA connector
    Replace with one borrowed from a friend
    Test i if reception is better you can order an antenna off ebay for $

    2. Broken solder joint to RP-SMA connector to antenna.
    unplug from USB
    remove the cover of your card
    check for a good connection between PC board and antenna connector with a multimeter (low resistance = good)

    3. Something broken with the internal circuits.
    buy a new one here.
    http://www.ebay.ca/sch/i.html?_trksid=p5197.m570.l1311.R8&_nkw=usb+wifi+adapter&_sacat=0&_from=R40
     
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  5. Mr. Penguin

    Mr. Penguin Administrator
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  6. alimp5

    alimp5 Active Member

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    very very thanks for help ;) :)
    question:

    1:for tp-link 7200ND 500MW antenna omni 12dbi is good? or excellent? or bad? 500mw suupport of 12dbi antenna?
    2:for tp-link 7200ND 500MW antenna directional 12dbi is good? or excellent? or bad? 500mw suupport of 12dbi antenna?
    3: ...................................... pannel antenna or antenna grid? or antenna parabolic???
     
  7. Gordon

    Gordon Member

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    A few thoughts . . .
    1. 12 dBi omni directional is hard to do without a huge antenna.
    Sellers may claim 12 dBi omni, but anything more than 9 dBi has an antenna that is hard to work with because of size.

    2. I prefer an 18 dBi yagi antenna like the one below.
    I have several like this that are NOT 20 dBi as advertised, but just over 16.
    http://www.ebay.ca/itm/2-4GHz-20dBi...tenna-For-Modem-PCI-Card-Router-/230856582634
    They are not very good outside for our icy and snowy winter here in Canada.
    I have one inside my office pointing to my wifi 3 buildings away and get 100% signal. (-38 RSSI)

    3. If you are "wardriving" and experimenting you want to start with OMNI to see what signals are in the area.
    The I switch to a directional antenna like the one above and aim it to get the strongest signal.
    Under windows I us Inssider (http://www.metageek.net/support/downloads/) for the time graph
    I aim the antenna for 1 minute intervals and see which signals come in stronger at that angle.
    Inssider is also good for driving as it handles GPS.

    When you asked about supporting a particular antenna, I am not sure I know what you mean.
    Here in Canada I believe the maximum broadcast power I am allowed WITHOUT A BROADCAST LICENSE is 1 Watt.

    so . . . 500 MW device with a 2 dBi antenna give 1 W broadcast.
    I am using a 2000 MW broadcast with an 18 dBi YAGI antenna so I am 36 times over the legal limit for my country.
    The law is probably designed to stop Radio Interference, so they probably don't care about my directional, narrow band, point to point WIFI network, but they may tell me to change my setup if someone complains about interference.

    This has good basic info - http://www.microsoft.com/athome/setup/wirelesstips.aspx#fbid=1C8Zru2yDHc

    This gets technical, but the section on ground scattering helped me fix some problems for our network.
    - http://www.l-com.com/content/WiFi Antenna Installation Best Practices.pdf
     
  8. ImJoJo

    ImJoJo The One & Only
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    I have this one and it's located in.....a drawer. It's good to try and reach things as well..lol :D 18 dBi?..yeah right!
    CAM00473.jpg
     
  9. Mr. Penguin

    Mr. Penguin Administrator
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    I have the exact same one ImJoJo crap for me too. My 5dBi has the exact same performance.
     
  10. Gordon

    Gordon Member

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    A quick check of real length vs dBi

    1135 mm is the calculated length for a 12 dBi dipole antenna.
    ((that is 44.65 inches)) for my American friends.

    I assume your antennas were not high end carefully tuned for frequency.

    You can look up the calculations for theoretical maximums for a given style and length.
    I also test in real world using a quick and dirty windows (Inssider) or 'NIX environments (airmon).

    every 3 dBi is a doubling in real power.

    if your read the RSSI you can test the difference that different antennas and adapters make.

    Here is an example of my laptops internal intel chipset VS my external Realtek 8187b with 6dB1 antenna

    https://www.facebook.com/media/set/?set=a.10151349919263779.1073741827.563258778&type=1&l=469b554082
     
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  11. ganja13

    ganja13 New Member

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    i have too tp-link wn7200nd and suuucks so bad:mad: , so just buy new one buy alfa awus036h the best ;)
     
  12. Remington

    Remington Well-Known Member
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    I also have that antenna and my experience is the same as yours.
     
  13. bobmy knob

    bobmy knob Active Member

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    yes alfa is the best Wi-Fi for $$ and with endless configuration for home-made antennas from kitchen ware to kitchen appliances for their reflective quality's. enjoy much this site yours sincerely,the newb
     
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