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3 antennas

Discussion in 'Tomato Firmware' started by rs232, Sep 10, 2012.

  1. rs232

    rs232 Network Guru Member

    On my old Buffalo WHR-HP-G54 under advance/wireless I have the option to select the receiving/transmitting antenna as A (internel) B (external) or AUTO (default). How does it work on e.g. the RT-N16 where the antennas are 3 external? I can still see A,B,AUTO in the options.

    Thanks
     
  2. Elfew

    Elfew Addicted to LI Member

    the third antennas is only for MIMO - look at wikipedia

    leave this settings to AUTO
     
  3. lefty

    lefty Networkin' Nut Member

    What i mostly found with the RT-N16 is that the middle antenna doesn't do much in effecting the signal, i upgraded the antennas on my RT-N16 with D-Link 7dBi's and i switched the middle one with the 7dBi and the stock antenna, didn't see any difference in signal when i switched. The 2 on each end though, very much effect the signal.

    And to note, the 3rd antenna isn't only for MIMO, you can have 1 antenna and still have MIMO, MIMO is the multiple streams used within, you can have 1 antenna and still have an N 150mbit MIMO... and since the RT-N16 is a 2x2 MIMO config, well you can figure out the rest ;)
     
  4. rs232

    rs232 Network Guru Member

    Very informative. Thanks a lot!!!
     
  5. lefty

    lefty Networkin' Nut Member

    It maybe possible for the RT-N16 to be a 3 receive x 2 transmit but i somehow still suspect that its a 2x2 MIMO config, because 3x3 denotes the 450mbit (150x3) units you see around, and there isn't many of them. The RT-N16 was made before all the 3x3 unit madness hit the scene and is advertised as a 300mbps max (150x2) which in order for it to report that, it would need two 150mbit streams, so that is why i lean more towards it being a 2x2 MIMO config. But i would still say if you only have a 2x2 300mbits wireless adapter in your computer or other wireless device, it could only use the 2 receive antenna chains and the 2 transmit antenna chains, it wouldn't be able to utilize the 3rd (middle antenna) receive stream to the unit. Probably why the middle antenna never seemed to affect the signal for me, i only have 2x2 adapters. And most times the middle antenna config on a 3 antenna unit is a dedicated receive antenna. But unless you have a 3x3 wireless adapter, it won't utilize it.
     
  6. rs232

    rs232 Network Guru Member

    Good stuff, not the MIMO stuff it's crystal clear.

    Just another question on the antennas and tomato's settings. I understand the Receive A/B/AUTO, but when it come to Transmit antenna AFAIK the signal is sent out both antennas. If that's true, should the Transmit options be A/B/BOTH?
     
  7. lefty

    lefty Networkin' Nut Member

    I always leave it auto, but you could always try and see, it shouldn't hurt to test it because you can always switch back to auto if it doesn't work.
     
  8. mito

    mito LI Guru Member

    To know which antena is the most proficient for me, I stayed with my comp 30 feet and two walls from my RT-N16 -avatar pick- and with inssider tested both antenas in "Auto" then both in "A" , then both in "B" and choosed the ones got best signal, in my case both in "A"
    Btw, my three antenas are 9 dbi.
    Just my 2 cents.
     
  9. lefty

    lefty Networkin' Nut Member

    Doesn't having 9dBi antennas as close on your unit as they are, cause much interference? Most times, if its 7dBi or over, a separate antenna stand base is recommended and even at 7dBi you end up teetering on cross interference..
     
  10. mito

    mito LI Guru Member

    I don'nt think so, as radio frecuency is not as matematics, if fine tunning,at some point you must go with "trial and error" system :cool: , i found that these antenas at more than 30 feet from client and checking wich one works better, works just fine for me, not if you stay closer.
    Rgds.
     
  11. mito

    mito LI Guru Member

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