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Thread: coax length

  1. #11
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    yes at times i do agree, but it depends on set-up !!!!
    RCI-2950DX, 1978 Cobra 148 GTL Taiwan, SHURE526T MIC, Tug-8 With Astatic 10 DA Head, Astatic 575M6, ASTRON 70/20 AMP POWER SUPPLIES, IMAX 2000 W GROUND PLANE KIT. TIMES MICROWAVE LMR-400 COAX, RF CHOKES. DIAMOND SWR/POWER INLINE METER. 250 of Sea Level Under Me. Recent World Radio Member.

  2. #12
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    Breaker breaker...coax length does play a roll when factoring your common mode current coming back down the coax from an improperly constructed (matched) antenna system...if you have a sufficient amount of reflected energy making your coax shield radiate like part of your antenna system then adjusting the length of the feed coax to match the antenna will affect any reading whether testing for lowest SWR or even plugging in your MFJ 259B or equivelent antenna analyser...key is to ensure your antenna is the proper length for the frequency your TXing on and ensuring that your impedence matches what your radio is designed for (50ohms), then the length of your coax really doesn't matter except for loses. Velocity factors only play a role when your trying to determine the length of your antenna when transmitting through that material, some people use coax as an antenna so they factor in the velocity factor of the coax coating and shorten the length depending on the percentage...so both of y'all are correct depending on how you look at it, if your antenna is not built correctly then length does matter but if it is then loses are pretty much all that your going to need to worry about with increased length of any measurement.
    Last edited by Moonchild 747; 05-04-2013 at 11:17 PM.

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    BOOTY MONSTER (05-06-2013)

  4. #13
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    I agree with moonchild 100%

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