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Does the MFJ-1984MP need a tuner? I put it to the test.

Discussion in 'Amateur Radio News' started by K5QBF, May 26, 2021.

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  1. W1YW

    W1YW Ham Member QRZ Page

    All long wires are resonant. Resonance here is irrelevant. Its the current distributions-- which determine the power patterns.

    An arbitrary longwire will likely not have a preferred, desirable power pattern at any ham band of interest. It will likely have lobes that will prevent useful operation at low angles, and at some azimuths, at one or more ham bands.

    End feeding is just a mechanical convenience for a feed connection, made practical in modern times by ferrite toroids. and ferrite chokes.

    Any SWR at the feedpoint can be conjugate matched/transformed by a decent tuner--if needed.
    M1WML likes this.
  2. K1CWB

    K1CWB Ham Member QRZ Page

    Nicely done on the test and video. Although I enjoy making my own antennas it is nice to know that some commercially made antennas seem to actually do what they claim. At the price of the low powered version it might be worth a try for me.
    M1WML and K5QBF like this.
  3. KQ4CD

    KQ4CD XML Subscriber QRZ Page

    not bad at all 73
    M1WML and K5QBF like this.
  4. KB2QQM

    KB2QQM Premium Subscriber QRZ Page

    How does this antenna work on 30M ?
    M1WML likes this.
  5. AF2B

    AF2B XML Subscriber QRZ Page

    I have this antenna in HP (800w version) but otherwise same, 1984HP 40-10, and I do not have the high SWR you on 28MHz. My max SWR on all the bands was at or below 1.3:1, 40m was literally flat like yours, my needle doesn't even move. I went from a shorty 40 dual band 40/20 dipole to this one and really saw an improvement in range and SWR. I like this one a lot.
    M1WML and K5QBF like this.
  6. K5QBF

    K5QBF XML Subscriber QRZ Page

    It is cut for 40M, so you get the harmonics. 40/20/15/10m.
    M1WML likes this.
  7. AG4I

    AG4I Ham Member QRZ Page

    Great video. Who makes the support pole you used? Also mfj? I would recommend experimenting with counterpoise wire or wires for the vertical/sloper config. I would start with one cut for 1/4 wave at middle of 40m using the old 234/freq in MHZ to get wire length in feet. 14g stranded should do fine. When it comes to ground wires for verticals, you will probably get as many opinions as responses, so have fun experimenting.
    M1WML likes this.
  8. K5SOP

    K5SOP Ham Member QRZ Page

    Very nice presentation. MFJ owes you, I just ordered one for portable use.
    M1WML likes this.
  9. M1WML

    M1WML Ham Member QRZ Page

  10. W6DMW

    W6DMW Ham Member QRZ Page

    This sounds like my scenario (going from 40/20 to this EFHW). What height was your old antenna at? How is the EFHW positioned now? I'm trying to see if going this route is really a good idea or not. I haven't decided the EFHW orientation yet though. Just looking for more info from those who have paved the way.

    Thanks! 73.

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