Cb antenna for dummys!!!

Discussion in 'CB Radio Forum' started by craig_sez, Sep 18, 2016.

Page 19 of 25
  1. Oct 13, 2016 #181
    rabbiporkchop

    rabbiporkchop Road Train Member

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    X=8.9 is a bad thing.. that's partially responsible for your extra impedance
     
    rabbiporkchop, Oct 13, 2016
    rabbiporkchop, Oct 13, 2016
    #181
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  3. Oct 13, 2016 #182
    craig_sez

    craig_sez Road Train Member

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    That 66.5 ohm reading..WTF is it..Is that supposed to be impedence? Oh and ifs a tad high and resistence as well and resonce is a lil off,you can squeeze some better #'s from your set up
     
    craig_sez, Oct 13, 2016
    craig_sez, Oct 13, 2016
    #182
  4. Oct 13, 2016 #183
    craig_sez

    craig_sez Road Train Member

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    Rabbi..thats a negitive 8.9 not a positive 8.9
     
    craig_sez, Oct 13, 2016
    craig_sez, Oct 13, 2016
    #183
  5. Oct 13, 2016 #184
    craig_sez

    craig_sez Road Train Member

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    Not good either way actually
     
    craig_sez, Oct 13, 2016
    craig_sez, Oct 13, 2016
    #184
    rabbiporkchop Thanks this.
  7. Oct 13, 2016 #185
    lilillill

    lilillill Sarcasm... it's not just for breakfast

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    X doesn't cross the 0 line and go positive until 36.985 mhz.

    2016-10-13 17.00.01.jpg
     
    lilillill, Oct 13, 2016
    lilillill, Oct 13, 2016
    #185
  8. Oct 13, 2016 #186
    lilillill

    lilillill Sarcasm... it's not just for breakfast

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    But then SWR is through the roof at 36.985... 11.8
     
    lilillill, Oct 13, 2016
    lilillill, Oct 13, 2016
    #186
  9. Oct 13, 2016 #187
    craig_sez

    craig_sez Road Train Member

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    Well depending on the freq you wanna tune for resonce you need to adjust your whip to make messary change
     
    craig_sez, Oct 13, 2016
    craig_sez, Oct 13, 2016
    #187
  10. Oct 13, 2016 #188
    craig_sez

    craig_sez Road Train Member

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    Impedence should be as close to 50 ohms as possible..The resistance should also be 50ohms and the x should be 0 at choosen freq..
     
    craig_sez, Oct 13, 2016
    craig_sez, Oct 13, 2016
    #188
  11. Oct 13, 2016 #189
    Ridgeline

    Ridgeline Road Train Member

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    Wrong ... sort of.

    You won't see 50 ohms resistance or should see it.

    The x is not really accurate measurement, because to complete the antenna thing, you have to take in account three components of the system, Xr Xc and X L.

    I know I'm not explaining it well, stupid cold, but if your X<0 then you have inductive reactance, X>0 you have capacitive reactance and if X=0 you have then the impeadence is resistive.
     
    Ridgeline, Oct 13, 2016
    Ridgeline, Oct 13, 2016
    #189
    rabbiporkchop and lilillill Thank this.
  12. Oct 13, 2016 #190
    lilillill

    lilillill Sarcasm... it's not just for breakfast

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    Z is impedance, which, as I understand it, is the sum of all resistance to current flow... reactance, resistance, etc.
     
    lilillill, Oct 13, 2016
    lilillill, Oct 13, 2016
    #190
    rabbiporkchop Thanks this.
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