Yagi vs Hexx beam

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by K2DN, Apr 17, 2011.

Thread Status:
Not open for further replies.
  1. K2DN

    K2DN Ham Member

    Let me start by saying that I am on a limited budget which probably does not go well with either of the scenarios below, but...

    I have a Hy-gain TH6-DXX, a CD-44 rotor and 50 feet of Rohn tower ready to put up.
    However I will need to buy a guying bracket plus the guying materials, turnbuckles, etc. I will also need to construct the concrete base. All of that amounts to $$$

    Bottom line on the TH6-DXX is that I still have a lot of work to get done and none of it is going to be cheap.

    Or.....I could buy a hexx beam and a push up mast and erect the whole works myself.

    So the question is, should I save a little more money and go with the TH6-DXX or go with a Hexx beam?

    Any opinions?
     
  2. WB2WIK

    WB2WIK Premium Subscriber

    I can't guide you on this, but I might comment that a CD-44 rotator turning a TH6DXX will last maybe six months and grind the gears to pieces. The CD-44 hasn't any brake and the TH6DXX is a big antenna.

    I destroyed a CD-45 (the newer version of the 44) in one weekend with a beam about that size on it (windstorm).

    Having said that, the TH6 is also a very good antenna and will run rings around a Hexbeam in terms of performance. Don't know what "work you have to get done," though. If you're doing a major re-build on the beam for some reason, that might indicate the one you have is old, broken, missing parts or whatever. Unless a re-build is very expertly done, it may never work as new.

    The CD-44 will turn a Hexbeam just fine and probably last a very long time; it's a much easier load to rotate than a TH6. Hexbeams can also be found in 5 and 6-band versions, which is 2-3 more bands than the TH6 covers.
     
  3. K2DN

    K2DN Ham Member

    No work to be done to the beam, it is in great shape, the work that need to be done is to the tower(concrete base, guying ,etc) Sorry, I can see where I was a little confusing, I just meant that on the TH6-DXX setup, I had a lot of work to get done.

    Thanks for the reply.
     
  4. WB2WIK

    WB2WIK Premium Subscriber

    If you go with the TH6 + tower, you'll need a different rotator.

    Good luck with the installation! It's a great antenna.
     
  5. W8NSI

    W8NSI Ham Member

    Hexx or Thunderbird

    Steve is not jerking your chain on this...

    That rotor will EASILY handle a hex-beam for a lifetime.

    The TH6-DXX will destroy that rotor. You need a MUCH heftier rotor. The TH6 is a heavier antenna with a much larger wind-sail area... it will catch the wind and turn, and that rotor will NOT hold it.

    The real question is: "Do you want to put up your tower and then have to climb it within a year to replace the rotor?" ...assuming that you live in a windy area and decide to put up the TH6. I knew a ham with a tribander and a TRUE armstrong rotor, geared and chain drive that he turned by hand from in his basement shack (near Sparta, Michigan) but that is another story for another thread.

    The TH6 is a tribander (20/15/10). On these three bands a TH6 will rule over the Hexx-beam but you are limited to those bands.

    The hexx can be built to cover 20/17/15/12/10/6 (all on the same antenna at the same time) and will work acceptably well on all considering it is a 2 element beam on all of them.

    There are your choices laid out. (TH6 tribander and a larger rotor versus existing rotor and a 6 band hex beam)
     
    Last edited: Apr 18, 2011
  6. W8NSI

    W8NSI Ham Member

    Just an afterthought, but if you go with a bigger rotor, be sure that it will fit in the tower. I know a guy that bought a rotor and discovered that he couldn't get it inside the tower... It's sad seeing a grown man cry like that. :)

    Also... sweet call sign for cw, Todd!
     
    Last edited: Apr 18, 2011
  7. N0AZZ

    N0AZZ Ham Member

    The Yaesu rotors will fit in your tower and the G-1000DXA will handle that beam fine I had one on a TH-7DX for a year or so and worked fine. The TH-6 is a better antenna on 10-15-20m than the Hex beam will cover more bands just depends on what band you work the most. I just erected another 25g tower with a hazer on it so no climbing for me my other towers are crank-up and fold over.

    You can find the Yaesu rotors used for about 2-300 dollars new about 500.
     
  8. K2DN

    K2DN Ham Member

    Funny you should mention that. My father's original callsign which he kept for 40+ years was WB4HII.When I was picking out a vanity callsign I received a lot of coaching from him as to what to look for in a callsign for CW.

    Thanks everyone for the advice on the rotor. I still do not know which way I am going to go. The TH6-DXX would be nice but the amount of work I am going to have to do to get it in the air seems a bit daunting; not to mention the financial side of the equation.

    The only two antenna's I have ever used are a ground mounted Hustler 4BTV with 32 radials and a carolina windom at about 30', so I do not have a whole lot of reference points. Can someone tell me what to expect when going from either of the above antennas to either the hexbeam or the TH6-DXX? I can read the technical specs all day, and I understand them, but without having some real world reference, it is hard to understand just how much of a difference there will be.

    Thanks.
     
  9. WB2WIK

    WB2WIK Premium Subscriber

    You're in for a complete shock. A TH6DXX at 40' or higher on a tower will work stuff you had no idea was even on the band. You'll hear signals the other antennas aren't hearing, period.
     
  10. G3TXQ

    G3TXQ Ham Member

    There are audio clips on my web page which may give you some idea. There are several which demonstrate the F/B performance of the hexbeam, and one which is A/B switching between a multiband doublet and a hexbeam; section 2, here:

    http://www.karinya.net/g3txq/hexbeam/broadband/

    73,
    Steve G3TXQ
     
  11. KM1H

    KM1H Ham Member

    The original Hexbeam has excellent F/R while the copycat versions with modification gives up that performance for a little more 2:1 VSWR bandwidth.

    Since you already have the TH-6 why change now? A used HAM 3 or 4 shouldnt be that expensive and every part needed for repair or overhaul is readily available.

    Carl
     
  12. G3TXQ

    G3TXQ Ham Member

    Not just more VSWR bandwidth, but more performance-bandwidth.

    2-el beam performance-bandwidth is strongly dependent on the bandwidth of the parasitic reflector. The compressed "W" shape Reflector used in the original Hexbeam has 3.2% bandwidth between the frequencies where the impedance phase angle is +/-45 degrees; the corresponding figure for my more open Reflector shape is 5.8% - an increase of over 80%. That's why it maintains its Gain and F/B over a wider bandwidth.

    The increased VSWR bandwidth is a useful by-product - not the primary reason for the alternative design.

    73,
    Steve G3TXQ
     
  13. KM1H

    KM1H Ham Member

    The original Hexbeam designer would maybe disagree. Since Steve is the originator of the alternative version he may be a bit biased:rolleyes:

    Id suggest that anyone contemplating one get all the facts first.

    Carl
     
  14. G3TXQ

    G3TXQ Ham Member

    It should be pretty easy for any unbiased readers to judge which of those two reflector shapes will have the wider bandwidth.

    They might also like read the web sites of the suppliers of the two designs; they can draw their own conclusions from the fact that the supplier of one design invites buyers to specify which part of a band they want the antenna "cut" for, whereas suppliers of the other design don't need to.

    73,
    Steve G3TXQ
     
  15. KF6ABU

    KF6ABU Ham Member


    It's not hard to argue over facts, however it is hard to disregard them. The facts are already presented by both parties... If you just want to claim Steve's wrong you can certainly do that, however facts would not be on your side.
     
  16. KM1H

    KM1H Ham Member

    Since there are 2 competing designs with both in commercial production (this means money plus ego is involved) all I suggest is making sure you understand both. If high F/B and a single mode of operation is planned then the original may be a better choice. An antenna tuner can take care of VSWR if you decide to operate elsewhere in the band as hams have done for generations with many other antennas.

    Carl
     
    Last edited by a moderator: Apr 21, 2011
  17. G3TXQ

    G3TXQ Ham Member

    Folk should also choose the original design if they want:

    * "An apparent gain of 6dBd" - that's 3-el monoband Yagi performance from a 2-element antenna half the size
    * "Pronounced rejection of man-made noise"
    * "Noticeable signal intactness and less fading"
    * "Audio remains more intact"
    * "Works well at relatively low height"

    I can assure potential buyers that my alternative design does none of those things!

    Steve G3TXQ
     
  18. WB2WIK

    WB2WIK Premium Subscriber

    I'd suggest keep tweaking it until it achieves all that.

    Alternatively, hire a marketing department and they'll take care of it.
     
  19. N6EAG

    N6EAG Ham Member

    1. Since when was using a tuner on a coax fed resonate antenna a good idea for increasing bandwidth?

    The tuner only provides a good match to the transceiver. It does nothing to reduce the losses that the coax line will incur with a high VSWR.

    2. Fake performance data from less scrupulous antenna manufacturers is not new.

    3. Let me add this to Steve's joke about the impossible antenna data. "It will toast your bread to perfection."
     
  20. KM1H

    KM1H Ham Member

    Excellent suggestions:D As much as some try to demean the true Hexbeam, it does perform rather well going by the many Ive worked.

    Ever since coax became popular and especially with trap and other shortened antennas. A tuner does not resonate an antenna BTW

    Which can be quite manageable with quality coax and short runs. Or use an auto tuner right at the feedpoint which is becoming rather popular at the 100W level.

    Would you care to elaborate how that has any bearing to this thread?
     
Thread Status:
Not open for further replies.

Share This Page

ad: SteppIR-1