A Better Reel - Flatlanders end fed half wave antenna

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  • Опубликовано: 2 ноя 2024

Комментарии • 58

  • @swenner64
    @swenner64 3 месяца назад +2

    I like mine!!!! I used it on fieldday. Need to adjust to the middle of band. It was well tuned to the lower portion of the bands. Seems really well made I left it in the backyard for about a month and other than tree sap seemed yo surve just fine. Love the way the balun is integrated into the winder.

  • @ryankc9oza118
    @ryankc9oza118 3 месяца назад +3

    I have one and works well. Ham radio dude got one and he added a ground lug

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад

      It wouldn’t be difficult to add a counterpoise if you wanted it

  • @paulKJ5GKK
    @paulKJ5GKK 3 месяца назад +1

    Thank you Michael. Love your activations. Keep them coming.

  • @DitDahDit
    @DitDahDit 3 месяца назад +2

    I have this antenna and love it for POTA. So easy and quick to deploy. A ground lug option would be nice, as would a smaller 40-10 option.

  • @johncheyney3515
    @johncheyney3515 3 месяца назад

    Thanks for finally getting me in the log. Glad I didn't sound like a Goober. John KF5PFP.

  • @russellroberts2228
    @russellroberts2228 3 месяца назад +1

    Great video...this seems to be an excellent antenna for both home and portable us. I almost thought the reel was from my old fly casting days. Thanks for reviewing this antenna. Aloha de Russ (KH6JRM).

  • @HAMRADIODUDE
    @HAMRADIODUDE 3 месяца назад +2

    Excellent presentation!

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад

      I'm glad you enjoyed it. I don't watch other online reviews until after I have finished mine, but yours is excellent too!

  • @unclemikeyplays
    @unclemikeyplays 3 месяца назад +7

    I notice it does not come with a counterpoise or a lug to add one, clearly expecting the feed line to double as counterpoise. I wonder if that accounts for the slightly high SWR?

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад +3

      I think you could be correct. I may have to add a choke to the feed line and clip a counterpoise to the ground side of the feed point connection to see if that makes a difference.

    • @flatlandermirrors
      @flatlandermirrors 3 месяца назад +6

      Michael, thanks again for doing the review on my antenna. During the last 2 years of developing this antenna I’ve set it up variations of it over a hundred times and sometimes using a 1:1 choke would bring down the swr sometimes not. I think it has a lot to do with the ground conditions. I never had any good results using just a counterpoise which is why there is no provision for attaching one. About using a choke I recommend putting a piece of coax maybe 7 ft long then the choke.
      Once again thanks for the review.
      Mike kd9obf
      I do make a Random Wire Antenna with a 71 ft long wire, no capacitor. It has a 9:1 balun using the same toroid. It comes with a 20 ft counterpoise which connects to the housing via a 2 mm banana plug. You do have to have a 1:1 choke and a good tuner to use it.

    • @timg5tm941
      @timg5tm941 3 месяца назад +2

      It was just a little long.

    • @PaulTaylor1
      @PaulTaylor1 3 месяца назад +2

      Get too carried away with the counterpoise and it's no longer an end fed halfwave, it's an off-centre fed doublet. ☺️ Truth is, it's never going to be a perfect HW, which on paper doesn't require a counterpoise.

  • @ChrisBeiting
    @ChrisBeiting 2 месяца назад

    I really like my X-Tenna EFHW, but I might have to check this one out for the portability alone. Pretty smart design.

  • @CriticalThinker-42
    @CriticalThinker-42 2 месяца назад

    Thanks for the review. FYI that Fair-Rite 2643251002 core close wound with a 100 pf TDK capacitor, as tested by Colin, MM0OPX Field Radio, and others is very efficient, more so than the 140-43 core 49:1 xfmr's. And handles 100 watts better, without saturation.
    73 mike

  • @theramblingsoflarry9290
    @theramblingsoflarry9290 3 месяца назад +2

    Hey great QSO Tuesday
    AL7NS

  • @MrThisIsMeToo
    @MrThisIsMeToo 16 дней назад

    Thank goodness you responded fast to Larry - F5PYI. If you don't he will continually call out his call without a care about overstepping - rude even. Had it happen to me twice and couple of friends. A thorn in the POTA World in my mind.

  • @M9A1MAN
    @M9A1MAN 3 месяца назад +2

    Love your videos Sir.

  • @Real_Berserker
    @Real_Berserker 3 месяца назад

    According to the law of physics, an inductor creates a magnetic field around itself. The magnetic field dampens all impulse interference around itself (coming from household appliances and passing vehicles). Therefore, an antenna with an inductor is the best antenna in urban conditions. On the other hand, the inductive and capacitive resistance of antennas is many times worse than the purely active ohmic resistance of the antenna at the resonant frequency. Therefore, it turns out that in urban conditions, the best antenna is a vertical antenna with an inductor, which can be tuned to different frequency ranges.

  • @davewhite7679
    @davewhite7679 2 месяца назад

    I recently discovered a dip in the VSWR plot of my Flatlander 4010 reel up EFHW, which unexpectedly puts the entire 160-meter band under 3:1 VSWR. With my G-90, I'm making mid-summer "late shift" POTA contacts on 160-meters with this 66' wire. I'm pleasantly perplexed. 🤫
    KZ9V

  • @vinniec5286
    @vinniec5286 3 месяца назад

    I'm not an expert, but all other 49:1 un-uns I have seen have a double winding on the 2 turn portion. I did not see that on this one. Did I miss it?

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад +3

      There are a couple different methods in winding a 49:1 transformer. Both have their advantages and disadvantages, which I won't go into great detail here. The Flatlander EFHW uses the Autotransformer method, instead of the more familiar 14 primary and 2 secondary turns with the crossover in the middle, the turns are all bunched together with primary and secondary taps in the line of the turns. This method results in more capacitance which cancels out leakage inductance, thereby making the transformer a bit more efficient. This method only works with certain types of ferrite cores, though, so it isn't ideal for every design, but it is a good choice for the core used in this antenna. Here's more background information: www.kn5l.net/kn5lEfhwUnun/

    • @vinniec5286
      @vinniec5286 3 месяца назад

      @@KB9VBRAntennas Fantastic! Thank you very much for the link. I will absolutely check it out. Always trying to learn. :)

  • @miltonklein9113
    @miltonklein9113 2 месяца назад

    Mike: Enjoyed the video. BTW, what rig and headset are u using?

    • @KB9VBRAntennas
      @KB9VBRAntennas  2 месяца назад

      I use a Yaesu FT-891 transceiver and the Heil BM-17 dual side headset.

  • @PhilBaker1
    @PhilBaker1 3 месяца назад

    Sorry if I missed this, but is this a resonate EFHW or non-resonate EFHW antenna? Thanks for the review Michael- Phil KZ4JK

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад +2

      I probably should have clarified in the video but an end fed half wave (EFHW) is always a resonant half wave antenna. A non resonant end fed antenna is referred to as either an end fed random wire or an end fed non resonant antenna. Because a non resonant antenna will not be a half wave on any frequency, you really can’t call it a non resonant EFHW. This antenna is a resonant EFHW.

  • @jeffferrell.k9hca531
    @jeffferrell.k9hca531 3 месяца назад

    Great video, Michael! I could not tell from the video how you had it configured, was it a straight vertical or a sloper? K9HCA

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад

      The antenna is in a sloper configuration, the peak at about 35-40 feet and the transformation at about five feet. The black stealth wire doesn't photograph well, so it is really hard to see on the video.

  • @mwillson100
    @mwillson100 3 месяца назад +3

    Too bad the wire windup mechanism doesn't wind like a fishing reel. It's backwards and cumbersome I see.

    • @TheMisterNomad
      @TheMisterNomad Месяц назад

      String it all the way out and rewind on the reel in the opposite direction - problem solved.

  • @johnallen6440
    @johnallen6440 3 месяца назад

    Would like to find the values for the parallel capacitor/resistor?

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад

      Mike does a really good job listing all the technical details of his antenna in the instructions. You can read them here: www.dropbox.com/scl/fi/7hmjt9vs7vki8s3dd1soy/FlatLanders2643251002Antenna.pdf?rlkey=3zzekqeny17glzktyw1wf1bet&dl=0

  • @BusDriverRFI
    @BusDriverRFI 3 месяца назад +1

    It uses lossy resistance.

  • @randomcrap763
    @randomcrap763 3 месяца назад

    Does this antenna need a counterpoise?

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад +1

      The antenna doesn't come with a counterpoise. Some feel that a counterpoise is important and other feel it isn't necessary. If you don't have a counterpoise, one risk is that the feed line braid starts to act as your counter poise. If you feel that is an issue, you can add a counterpoise to the antenna and choke off the feed line.

    • @randomcrap763
      @randomcrap763 3 месяца назад

      @@KB9VBRAntennas Thanks! I'm still confused on this whole "When is a counterpooise or radial needed" thing LOL :) 73!!

    • @PaulTaylor1
      @PaulTaylor1 3 месяца назад

      ​@@randomcrap763​@KB9VBRAntennas on paper an EFHW doesn't need one, as both "sides" of the antenna are present on each half of the single wire. But of course in practice there's always an imbalance... I never worry about it in the field, but at the home QTH I imagine you'd want a choke or something to make sure you don't get RF where you don't want it!

  • @davidsradioroom9678
    @davidsradioroom9678 3 месяца назад +1

    If it would to 80 meters, it would be great.

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад +1

      An 80 meter end fed half wave is a very long antenna (twice the length of one that does 40 meter). What I do when I want to work 80m as part of a POTA activation is instead use an end fed random wire (non-resonant) antenna. You need to use a tuner with them, but the radiator is only 71 feet long, which is much more manageable.

    • @ronpetroski7203
      @ronpetroski7203 Месяц назад

      @@KB9VBRAntennas i would use the wolf river coil for 80 10.

  • @willian.direction6740
    @willian.direction6740 3 месяца назад

    Don't see the convenience of a reel antenna because you have to unwind it first on the ground to deploy it. That would become a caught up mess on the ground cover in my environment. The cranking spool is too small making it really low geared too. Cant beat winding light weight antennas on finger and thumb figure of 8 from my experience.

    • @TheMisterNomad
      @TheMisterNomad Месяц назад

      Have a helper hold it, or cut something like a short piece of 2x4, cut out a round in it the shape of the real. Maybe put two eyelets on the 2x4 to put a short bungie cord over the spool to hold it on the 2x4 while you unspool it.

  • @NamasenITN
    @NamasenITN 3 месяца назад +1

    It can probably be 3d printed and reverse engineered easily, given the simplicity of the design.

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад +6

      Why go through all that trouble when it’s easier to support the creator.

    • @ronki5gnl689
      @ronki5gnl689 3 месяца назад +2

      Agreed 👍💯.

    • @mfbengs1
      @mfbengs1 3 месяца назад

      @@KB9VBRAntennas couldn’t agree more. I think my time is worth more!

  • @ronniet5680
    @ronniet5680 3 месяца назад

    Again these are modified antennas from the original yoyo vee antenna

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад

      I'm not sure of your point, as this is nothing like the yo-yo vee, other than using a reel mechanism for storage.

  • @chrismosquad1056
    @chrismosquad1056 3 месяца назад +1

    Stupid sexy Flatlanders... ⛷️
    (Relax, it's a Simpsons reference!) 😂
    Looks like a great POTA tool! Great video, as always, Michael! 👍🏻

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад +1

      We say the same thing when they invade up-north Wisconsin.

  • @Francois_Dupont
    @Francois_Dupont 3 месяца назад +1

    inferior copy of the Eclise Antenna.

    • @KB9VBRAntennas
      @KB9VBRAntennas  3 месяца назад

      Never heard of that antenna, so I can't say.