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Buying end fed, any advice?

Discussion in 'Amateur Radio Antennas' started by 338_MtRushmore, Oct 3, 2017.

  1. kopcicle

    kopcicle
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    Yes the OCFD can be scaled to 40m
    Distance above ground affects feed point impedance and therefore percentage of offset.
    Yes the OCFD can be supported in the middle by a non-metallic pole.
    The OCFD is best supported from the feed point.
    An inverted Vee is best supported from the feed point.
    A vertical requires some sort of radial system to work off of. (the difference with and w/o the radial system is very noticeable)
    A pneumatic push-up vertical (approximately 36') for night time use with a tuner that can be pulled down for day time is another possibility. (PM if you are really interested) .

    Just some thoughts :)


     
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  2. Tallman

    Tallman
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    W9WDX Amateur Radio Member, KW4YJ EXTRA class

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    Mine gets into the Ice maker with 500 watts! Joking, I don't use amps. I had one neighbor have some trouble with my signals getting into his TV that did not have cable.
    It was an old RCA Victor 25" floor model. I bought him a new 32" insignia LCD TV and an outside antenna. I put his antenna on the side farthest side away from my antenna. Now I don't bother him any more and he is happy as clam and he thinks I am very rich.
     
  3. Tallman

    Tallman
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    I would like to have one of those towers!
     
  4. 338_MtRushmore

    338_MtRushmore
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    I can't see one of those pneumatic poles working well in the winter, unless it was a large commercial unit.

    I have thought about isolating my mast from the camper frame and adding some ground radials. Not sure if a vertical would work very well that close to the camper though, not to mention tuning.
     
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  5. K3ACZ

    K3ACZ
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    With about 40' of wire and my pre-made unun from eBay for $37 I can get down to 80m easily. Talk East coast to Michigan easily.
     
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  6. Road Squawker

    Road Squawker
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    Have you considered "moving" to the lot, waaay down in the corner, that no one wants to use?
     
  7. 338_MtRushmore

    338_MtRushmore
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    I am already there, but it isn't exactly a dump where I can dig supports and weave a web of wire wherever.
     
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  8. kopcicle

    kopcicle
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    not to divert traffic but save some space ...

    https://www.eham.net/ehamforum/smf/index.php/topic,110756.0.html
    It isn't large or commercial but just good ole backyard engineering.
    I can see it being a pita in a freezing rain or covered with snow but otherwise okay. It's just simple bushing and O-ring construction with the option of a Nitanol (nickel-titanium) alloy conductor that relaxes into the same shape when retracted. Maybe stepped, conical, slinky, of decreasing diameter gets the picture across .

    I built one of pvc and started with a large drain pipe.
    I built the metallic version as well as the hybrid.
    Eventually I'd like to build one beginning with a 24" inner diameter but DOM gets pricey in those sizes . I'm a pretty good scrounger as well. I even have a shade tree method to put a finish on an inside diameter of one to two feet. It just seems like a lot of work for a 160m vertical. Not quite within the realm of conventional construction but, just a thought ?
     
  9. Tallman

    Tallman
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    I'm almost ashamed it took me this long to remember this well hidden antenna. When I say almost ashamed the fact I remembered at all is a miracle. After all can any body complain about displaying the flag? If they complain label them as "Unpatriotic" very loudly and publicly and see if they don't back down.

    http://hamuniverse.com/kx9dk4btvflagpole.html

    I have often thought about trying a similar design using a balun to end feed a metal pipe for the radiator. For radials you could lay down bare copper grounding wire. There is a machine you can rent from Home Depot that will set a wire fairly deep with out tearing the yard up.
     
    #39 Tallman, Oct 5, 2017
    Last edited: Oct 5, 2017
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  10. firerunner

    firerunner
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    I have run a MY Antennas 8010 end fed it does what they and made many contacts with it. They make a 160-40 also never used that one. the 8010 is very well made and easy to put up.
    http://myantennas.com/wp/product-category/antennas/efhw-multi-band/

    I ran 700 watts through it with no problem especially after I grounded it.
     
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  11. 338_MtRushmore

    338_MtRushmore
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    I ordered the balun desings 4:1/9:1 unun. I'm curious to see how it is made, and I can try it out on a vertical too.

    It looks like the other "half wave" style end feds use a voltage transformer that is completely different from an unun. Maybe I'll try one of those next.
     
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  12. 2RT307

    2RT307
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    Have you had time to string it up? Just curious how it's working for you. I just ordered the EARCHI and also bought the 9:1 "QRP" unun from Balun Designs. I'm going to try them both out and see what I think. Looking to put these in my "go box" just for kicks.

    73,
    Brett
     
  13. 338_MtRushmore

    338_MtRushmore
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    I made a mounting plate and was going to telescope the mast down but there was too much ice. Hopefully I can get to it next week.
     
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  14. 338_MtRushmore

    338_MtRushmore
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  15. 338_MtRushmore

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    I strung it up last night with with 72' on the 9:1. Noise floor was s9 to 20 over. Lots of experimenting to do, but it's a start.
     

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