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MFJ-917 Laboratory Balun Performance

Discussion in 'Amateur Radio Equipment Reviews' started by WB9YPA, Oct 19, 2021.

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  1. WB9YPA

    WB9YPA Ham Member QRZ Page

    I wanted to see how well the MFJ-917 lab balun performed so I hooked one up to my HP8753D vector network analyzer. I am pleased with what I found. This is a sweep from 1MHz to 60MHz with markers at 1.8MHz, 29.7MHz, and 54MHz.
    The second photo shows the Return Loss in dB and impedances.
    mfj917_lab_balun.jpg mfj-217_return_loss.jpg
    Last edited: Oct 19, 2021
    WA9UAA likes this.
  2. KU3X

    KU3X Ham Member QRZ Page

    Looks like return loss is pretty good. But, with a VNA, why not show how much attenuation the balun provides? Not inline losses but how much attenuation it provides from keeping the RF from coming back down the transmission line.
  3. WB9YPA

    WB9YPA Ham Member QRZ Page

    Good idea Barry. I'll see what I can come up with when I can get a break from work.
  4. K8DO

    K8DO Ham Member QRZ Page

    Give it a 3:1 mismatch and hit it with 1500 watts for three minutes. Let us know how it goes.
  5. WB9YPA

    WB9YPA Ham Member QRZ Page


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