Tweaking the Endfed antenna SWR chart correction

 I was reading my most recent post and something clicked.....and it was not a good "click". I looked at the posted SWR chart from my 44-foot antenna experiment and the numbers looked very familiar! Somehow I copy and pasted the numbers from the 41 foot SWR results and reposted them for the 44-foot experiment. Below are the corrected results for the 44-foot Endfed wire. 

SWR with a counterpoise:

Band          Freq             SWR
80m            3.500            8.4
80m            4.000            9.0
40m            7.001            4.6
40m            7.060            4.6
30m           10.100           4.6
30m           10.150           4.6
20m           14.001           2.1
20m           14.060           2.1
17m           18.068           2.3
17m           18.168           2.3
15m           21.001           3.1
15m           21.060           3.1

SWR without a counterpoise:

Band          Freq             SWR
80m            3.500            6.8
80m            4.000            6.1
40m            7.001            3.5
40m            7.060            3.5
30m           10.100           4.6
30m           10.150           4.6
20m           14.001           1.4
20m           14.060           1.4
17m           18.068           2.0
17m           18.168           2.1
15m           21.001           3.1
15m           21.060           3.1
Mike Weir, VE9KK, is a regular contributor to AmateurRadio.com and writes from New Brunswick, Canada. Contact him at [email protected].

2 Responses to “Tweaking the Endfed antenna SWR chart correction”

  • Andy G0SFJ:

    Hi Mike, I call the two different lengths of wire an offset-centre dipole and feed both wires from a 9:1 balun, one wire each side. Short coax to the balun.It could also be a 4:1 balun or any other windom type antenna balun. It willl be resonant on at least one of the bands, probably many. It works for me with my IC-7300 auto tuner. I just accept that some bands won’t work.

    hope this helps

    73 de andy g0sfj

  • Mike VE9KK:

    Good morning Andy and very nice to hear from you, it’s great that this configuration is getting you on the air. At this point in time I have not been at this location all that long and still trying to feel out the HOA here. I don’t want to push it as a dipole type antenna will kinda stick out.
    Thanks for stopping by and taking the time to read and leave a comment.
    73,
    Mike
    VE9KK

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