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Horizontal and Vertical -Same Time.

Discussion in 'CB Antennas' started by silvereagle1, May 23, 2012.

  1. Zman

    Zman K9FON

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    Eh ill keep my antenna the way it is. This reminds me of the gimmic of adding wires to the reflector of a moonraker or the like to "tighten" the reflector. LOL I knew a local who fell for that gag and his signal was just as strong out the backside of the beam as the front!!! He wound up removing the wires.....


     
    SIX-SHOOTER likes this.

  2. TonyV225

    TonyV225 W9WDX Amateur Radio Club Member

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    Thats hilarious!!! Ive read soooooo many articles on that gimmick of those reflector wire kits myself. I often laughed at it because if it was that great olf a thing to do then amateur radio antenna makers like Cushcraft would be doing it ;)

    As far as the vert and horz at the same time I have a meter with the built in switch box that has the option but SWR jumps up as mentioned above. I know that alot of people would take the maco 4 element and set it up vertical but.....They would actually tilt or angle the elemets and then tighten everything down. The theory behind this is to also achieve vert and horz transmit.
     
  3. Captain Kilowatt

    Captain Kilowatt Professional Amateur
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    Feeding both polarities at the same time will result in a signal that is 3 dB down from what itcould be at any given instant however it will greatly reduce fading due to polarity shift. It works well if it is done right and simply using a TEE connector to join the two cables is not the right way. You need specific lengths and impedances of cables.
     
  4. Robb

    Robb Yup

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  5. Robb

    Robb Yup

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    Signal Engineering's site had an informative write-up on antenna polarization.

    Here is a diagram of how one might wire up a dual polarized antenna:


    [​IMG]


    The Ultimate Guide to 11 Meter CB Antennas
     
    #20 Robb, May 23, 2012
    Last edited: May 23, 2012
  6. KC9Q

    KC9Q Supporting Member

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    Attached is a copy of cross polarized yagi's (aka, circular polarization). Figure 12-3 shows the harness is made from one type of cable (i.e., RG-133). One side of the harness is 1/4 wave of RG-133, and the other side ie 3/4 wave of RG-133. Everything is connected with a tee connector. The main feedline is standard 50 ohm coax. (This is a coy out of the ARRL 1974 Antenna Handbook).
     

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  7. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    Well, now we know how to make CP, and the video shows us how to tell which direction the CP antennas are radiating. All we have to do now is get all the other radio guys to change their setups to doing the same, and then we could all, ohooo! noooo!, what do we do about the directional qualities in CP propagation?

    Well maybe this video guy could direct us all as to which CP works best to all the new CP setups, so we can all communicate without any fading or picket fencing from all the mobiles.

    No Robb, IMO, CP just ain't practical unless maybe we're trying to work two specific stations, or two specific groups that happen to be very close together on each end.
     
  8. HomerBB

    HomerBB Sr. Member

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    I like the idea. It may not be practical, but it is a great idea for more fun. I never accept arguments for the same reason I never endorse a stew I haven't tasted. It's worth me trying some time, and as for not getting everyone in my receive, I've had the same problem with all my antennas. . .
    So it's wait and see for me.
     
  9. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    Homer, I would never say not to go forward with ideas, I was just raising the practical aspects of the usefulness.

    IMO, the idea is only useful when you control both ends of planned line of site type communications, and are assured that all phasing is working as intended. The proof of this should be pretty much in evidence by the links already provided, or at least as it seems to me.:thumbdown:
     
  10. W5LZ

    W5LZ Crotchety Old Bastard

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    What it amounts to is that circular polarization does have a useful purpose. It is not useful in all circumstances, or it's just too much trouble for too little benefit (if any).
    If you are talking about HF then there's no benefit to C.P. unless you're talking to space craft. Wanna try it and see what happens? Do so! Then you can evaluate just how useful it is, if it's worth the time/trouble.
    - 'Doc
     
  11. hookedon6

    hookedon6 W9WDX Amateur Radio Club Member

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    ROBB total BS ad,... circular polizarition requires antennas to be fed OUT of PHASE
     
    Robb, wavrider and Marconi like this.
  12. HomerBB

    HomerBB Sr. Member

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    Marconi, Doc,
    At this point I agree with you both 100%.
    Nevertheless, I have been curious about it for some time, and now that the subject has arisen I may try it. I have a couple of dipoles laying around so it shouldn't be too much trouble. Likely it will be just another look and see thing
     
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  13. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    Homer, go for it.

    Hookedon6 nailed it, but I was trying to be nice of funny one, take your pick. Robb is my friend and one of the few I talk to on my 2-way...on this forum.
     
  14. HomerBB

    HomerBB Sr. Member

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    I'll take a double scoop of both.
    I already knew one set of radials needs to be 90* out of phase to achieve CP.
    I just figured if the seller was marketing his harness it would be most likely to
    folks who neither knew nor cared. Furthermore, if you are selling something
    why tell them how to make it?
     
  15. Marconi

    Marconi Usually if I can hear em' I can talk to em'.

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    Robb gave us the link to Maco's new item and it describes the item to a "T", but I didn't check it out at first, and that is what I asked Robb to describe. Then the discussion, and seemingly nobody checked out the link.

    That harness may do what they claim if the installer has all of his ducks in a row. Like the video guy said clearly, both radiators need to be pretty close in all respects too, and that can be an issue if not watched carefully. That is also what QRN said in his remarks.

    I can't say how much difference it would make, but it could be important to check. That is why we use to recommended on the co-phase harness packaging the proper way to install them on the rear bumper of P/U trucks only, back in the day. This could be like co-phase harnesses too, most will probably show a good enough match, and that is what most CB'rs look for when they install something new. But, when they get through...all of a sudden the thing is better that sliced bread regardless of how it really might be working. This dosen't happen in every case, but it happens.

    IMO, there is a little more to doing new things, rather than just stumbling around in the dark...without any effort to try and understand. Homer, I think you're far more aware, cautious, and understanding than most, and your goal is likely always trying to really see just how things work and perform.

    Not so much with most others, I guess that was my point.
     

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