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Thread: RG58 Vs RG8X Vs LMR400 (The true radio buffs in here should know this)

  1. #1
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    Wink RG58 Vs RG8X Vs LMR400 (The true radio buffs in here should know this)

    I currently have the COM-8068 10db Gain Nextel Yagi with the standard 14' of RG58 Cable which I've had great luck with.

    My only issue is that the 14' of RG58 simply wasn't long enough. I stopped by Radio Shack and picked up a 50' length of RG58 with the appropriate connectors to replace my existing cable and have since noticed a significant amount of loss with the increased cable length.

    I'm attempting to decide between LMR400 and RG8X cable to replace the lossy RG58. I assume the LMR400 cable is a lower loss cable than RG8X, but exactly how much lower for a 50' run at around 806-866MHZ? What kind of difference is there between the RG58, RG8X, and LMR400 when it comes to loss? Also, what is the difference in diameter between these cables?

    I figured the Ham / Shortwave radio buffs and maybe the networky folks might be able to shed some light on the subject. Thanks in advance.
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  2. #2
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    LMR400 - Diameter: .400 6.7db loss/100 ft @ 2.4 Ghz (50 feet max recommended length)
    (Got it from this site: http://www.netnimble.net/cables.html)

    Here's another cable loss chart I found from
    (http://gir.seattlewireless.net/piper...ry/002611.html):
    cable diam db/100' vel. imp. cap. cost/ cost/ source
    at 2.4G fact (pf/ft) ft 1K ft
    ------- ---- ------- ---- ---- ------- ----- ----- ------
    LMR1700 1.25 1.7 $6.95 www.fab-corp.com
    LMR1200 1.2 2.3 .88 50 23.1 $4.19 www.fab-corp.com
    Heliax .875 2.3
    LMR900 .870 2.9 .88 50 23.1 $3.49 www.fab-corp.com
    Heliax .5 3.9
    LMR600 .509 4.4 .87 50 23.4 $0.99 $970 www.fab-corp.com
    LMR500 5.4
    LMR400 .405 6.7 .85 50 23.9 $0.63 $470 www.fab-corp.com
    9913 .405 7.5 .84 50 24.6
    9914 .405 8.7
    LMR240 .242 12.65 50 24.2 $0.46 $400 www.fab-corp.com
    RG213 .405 13.7
    RG8/U .405
    LMR200 .195 16.5 $0.38 www.fab-corp.com
    LMR195 .195 $0.37 www.fab-corp.com
    RG8 .405
    RG8X .242 21.6
    RG58/U .195 35 .66 53.5 28.5
    RG58A/U .195 35 .66 50 30.8
    LMR100A .105 38.9 $0.29 www.fab-corp.com
    RG174 .110 75

    Looks like LMR400 or above would be your best bet, keep in mind your loss will be a little less since they are measuring at 2.4ghz, and also the general rule is 3db of loss is losing half the signal.

    Hope it helps,
    Nick

  3. #3
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    One other thing to add. Try to have the least amount of connectors as every connector will create about 1-2dB of loss. I wouold suggest using LDF4-50a. This is what we use for our tower antenna jumpers from the larger LDF5. Check this out:

    http://www.econ2way.com/catalog/publ...nded_cable.htm

  4. #4
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    Thanks folks. That econ2way link was especially helpful.

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