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Linksys antenna connector for RG6

Discussion in 'Other Linksys Equipment' started by Roughrider, May 13, 2004.

  1. Roughrider

    Roughrider Network Guru Member

    Looking for a connector to connect an RG6 cable ("F" conector) to the back of a Linksys router.

    Also unsure of the effect of connecting an outside omni wifi to one side of the Linksys wireless router.

    Anyone with advice?
  2. bummpr

    bummpr Network Guru Member

  3. jdepew

    jdepew Administrator Staff Member Member

    The connector style that you would want to use is the RP-TNC. That is the style of connector used on Linksys routers and access points, while the connector used on cards such as the PCI WMP54G is RP-SMA.

    A nice litle pictorial of various connectors can be sen here http://wireless.gumph.org/content/3/7/011-cable-connectors.html

    connectors can be purchased at places such as this - http://www.wirelessnetworkproducts.com/index.asp?PageAction=VIEWCATS&Category=642

    We do not endorse WirelessNetworkProducts.com nor are they an affiliate - I just happened to find they have a nice selection of connectors with photos for comparison.
  4. AbNormal

    AbNormal Network Guru Member

    Note also, that RG6 cable is a 75 ohm cable designed for satellite and cable TV use. You should be using a 50 ohm cable instead.

  5. sludgemaster

    sludgemaster Network Guru Member

    AP connection to external omni antenna

    I have successfully connected an AP to coax to an external 10 dbi omni antenna (for marine use). First, as others have noted,you probably do not want to use RG6 due to the resistance and resulting signal loss. The output of WiFi units is so small that cable loss becomes a significant consideration.

    For outdoor use I recommend RG213 (outdoor marine grade) or LMR 400 to run between your AP and antenna. This is 50 ohm, low-loss cable. You can buy this coax and an RP-TNC connector for this cable here: http://www.davisrf.com/

    Depending on the length of the cable run, you may also want to consider an amplifier. You can get them here: http://www.fab-corp.com/

    Be careful when choosing your amplifier power, because the FCC regulations limit you to 15 dbi output.

    If you want to connect RG6, you can purchase an RP-TNC to F -Female.

    I hope this is of some help.
  6. jdepew

    jdepew Administrator Staff Member Member

    good information sludgemaster, thanks!

    TECHONE Guest

    Selecting the Proper Coax for an Access Point

    Selecting the Proper Coax for an Access Point, Repeater, Client...

    Whenever you choose a coax feedline, the frequency of operation is a very important consideration. TV coaxial cable is 75 Ohm and therefore should not be used since the antenna connector on a 2.4GHz access point would be 50 Ohm. Any of the 50 ohm coax will work for your 2.4GHz application, however choosing the best coax for your 2.4GHz system will enhance your overall success and can make a world of difference with regard to time spent "tinkering" vs. time spent "enjoying".

    With 2.4GHz line loss is a major concern and with 4 watts TOTAL EIRP maximum including antenna gain coax choice could be critical. At minimum coax such as RG-214 or Belden 9913 should be used. The RG-214 coax is a double shielded RG-213 type coax and usually is a lot of trouble to find connectors for and work with. For most home applications Belden 9913 is a good choice where coax length is at a minimum. RG-213 is a great coax for long runs operating at VHF (below 300 MHz) or lower frequencies and is not recommended for 2.4GHz due to substantial line loss.

    Low loss 50 Ohm coax (Andrew Heliax) is usually larger in outer diameter (0.5-1.5" typical) and utilizes rigid copper for the inner and outer conductors. It is also more expensive, less flexible and uses either air or low-loss foam dielectrics. Different companies use different outer conductor shapes such as tubular, corrugated or spiral.

    In one of my applications, I use 7/8 inch foam dielectric Andrew Heliax rigid corrugated copper transmission line. Length is short and connected to a Cisco 350 unit in the attic. This 100 milliwatt hop travels to an elevation of 3000 ft higher than my location which is 29 miles away point to point using Andrew 24 dBi Mag Grid Antennas on each end and works quite well. For line loss, the Andrew Heliax is a superb choice, however it is not practical for most home installations as this cable has very little flexibility. In contrast, the Belden 9913 is a good cable that has greater flexibility! Footnote: I use a lot of 1/2 inch Heliax as well more flexible than 7/8 inch... works very well.

    Some popular 50 Ohm coax types. Specifications are typical at 1 GHz.

    TYPE: RG58
    FREQUENCY: 0-3000
    POWER: 45
    LOSS (dB PER 100 ft): 15-20
    DIAMETER (INCH): 0.2"
    COST: low

    TYPE: RG8/RG213
    FREQUENCY: 0-3000
    POWER: 190
    LOSS (dB PER 100 ft): 9-10
    DIAMETER (INCH): 0.4"
    COST: moderate

    TYPE: Belden 9913
    FREQUENCY: 0-1000
    POWER: 275
    LOSS (dB PER 100 ft): 4-5
    DIAMETER (INCH): 0.4"
    COST: moderate

    Times Microwave LMR400
    FREQUENCY: 0-2000
    POWER: 350
    LOSS (dB PER 100 ft): 3.5-4
    DIAMETER (INCH): 0.4"
    COST: moderate - high

    TYPE: 1/2" Alum.
    FREQUENCY: 0-3000
    POWER: 650
    LOSS (dB PER 100 ft): 3-3.5
    DIAMETER (INCH): 0.6"
    COST: moderate - high

    TYPE: 1/2" Heliax
    FREQUENCY: 0-8000
    POWER: 900
    LOSS (dB PER 100 ft): 2-2.5
    DIAMETER (INCH): 0.6"
    COST: high

    TYPE: 7/8" Heliax
    FREQUENCY: 0-5000
    POWER: 2,000
    LOSS (dB PER 100 ft): 1.25-1.5
    DIAMETER (INCH): 1.0"
    COST: high

  8. nickfark

    nickfark Network Guru Member

    wireless amplifier

    the usual length of cable for an external is about 3 feet. was wondering if with an amplifier of some sort can u increase the length of cable.. and how much length...

    NEUVOC Guest

    i did this a couple of weeks ago.... i connected my linkys to 1W amp... the cable from the antenna to amp is about 50cm and from the amp to my router can go from 30-50m.... yes, use the 50ohm cable... the signal is superb....

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