Can you mix two kinds of 50 ohm coax?

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by N1QWI, Dec 31, 2020.

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  1. N1QWI

    N1QWI Ham Member QRZ Page

    Hi everyone,

    Is there any reason why it would be in advisable to mix RG 8/U with LMR- 400 feedline on my 150 foot run from the 80 m loop to my shack?

  2. W1VT

    W1VT Ham Member QRZ Page

    I mix cables all the time. It makes more sense to use my short runs of 1/2-inch Heliax than to store them in the garage!

    Zak W1VT
    WD4ELG and N1QWI like this.
  3. K7JEM

    K7JEM Ham Member QRZ Page

    Sure, no problem.
    N1QWI likes this.
  4. W9KEY

    W9KEY XML Subscriber QRZ Page

    I suppose you could at least record the approximate lengths in your station notebook, since it's possible they will have slightly different velocity factors (as can the same cable type from different manufacturing runs - at least so I've been told). The actual velocity factor is generally unimportant, unless you use the coax for some critical length application like stubs / tuned elements. VF is a baseline setting in my RigExpert AA-230 Zoom antenna analyzer and important if you use the TDR function to determine cable length or "discontinuities" like an open / short location.
    AK5B likes this.
  5. AI3V

    AI3V Ham Member QRZ Page


    Please take special care at the splices.

    That's where the trouble usually is.


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