convert cb antenna to ham multiband?

Discussion in 'General Technical Questions and Answers' started by N1BRU, Nov 7, 2008.

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  1. N1BRU

    N1BRU Ham Member QRZ Page

    I have a cb antenna similar looking to the Cushcraft AR6 vertical(about same height). It has the tuner ring at the bottom. How, if any can I convert it to at least a 6 band amatuer antenna? I am limited for radial space but height is no problem, I have a Yeasu 857D HF radio with auto tuner but don't have HF antenna only 2meter/440 homebrew. Since this antenna is just laying in the garage and doing nothing I figured I could convert it to do ham frequencies. Any help would be appreciated. My "shack" is on the 3rd floor of 2 family house, have many overhanging tree limbs and really don't have the leasure in doing a long wire, would have to be end fed do to the location of shack. I really don't want to spend any cash for an antenna, I would rather make one, if I can.
    Thanks in advance for any help

    KB1QNU
    73's:)
     
  2. WJ5O

    WJ5O Ham Member QRZ Page

    CB antenna for multi HF frequencies

    I use a CB designed antenna for a ten meter beacon....... but, I have found that it will also tune 17, 15 & 12 meters with an external tuner........
    The rings are a bit sensitive for the original adjustment but once adjusted seems to stay there. The antenna is an Antron 99 and is about the same height as the Cushcraft that You describe. :confused:
     
    Last edited: Nov 7, 2008
  3. KA4DPO

    KA4DPO Ham Member QRZ Page

    If you have a very good RF ground system you could use it as the top portion of an end fed system. Run a wire up to it and tune it using an external tuner not the one in your radio, it doesn't have sufficient impedance range.

    The only othe suggestion would be to connect ground radials and connect an SGC auto tuner to it. The bands covered will be limited by the length of the radiator.

    It can probably be made to work on 10 meters with very little modification.
     
  4. G0GQK

    G0GQK Ham Member QRZ Page

    If you use this old CB vertical as part of a longer antenna, if you can extend it to about 31 ft , used with an ATU you could use it on 40, 30, 20, and 15 metres but it would require a counterpoise radial to be efficient.

    G0GQK
     
  5. W5DXP

    W5DXP Ham Member QRZ Page

    If he extends it to 123 feet, he can use it on 160m. :)
     
  6. K7MH

    K7MH Ham Member QRZ Page

    Sounds like you have an AR10 or a CB Ringo which is not much different and may be the same antenna. Cushcraft makes the Ringo for 2, 6, 10 and CB. They are all called Ringo's. You can probably tweak it as it is for 10, 12, and maybe 15 meters but that is probably about it and then only have it set up for one of those bands at a time unless you use a tuner. It cannot realistically be modified to be used as a 5 or 6 band vertical like a Hustler 4-BTV or similar trapped vertical antenna. You can use a tuner and get it to work to some degree on other bands perhaps but I wouldn't expect much in the way of performance at all. I would look for something else for the other bands depending on what you may have room for and/or budget for.
    One of the big problems I see people have when making the transition from CB to the ham bands is that they are used to one rather simple to install antenna that covers everything they want to do on CB. It is not quite so simple on the various ham bands. I used a Hustler 5BTV in the ground with no radials as a Novice and had a blast with it even as inefficient as it was.
     
  7. KI6UMH

    KI6UMH Ham Member QRZ Page

    I have a Yaesu FT-60R could i connect my old CB antenna to it for use on the 2m ,440 bands the antennas is a simple Radioshack antenna
     
  8. KA0GKT

    KA0GKT Ham Member QRZ Page

    I once used just such a Cushcraft CB antenna on HF. Here's what you do:

    1) Remove the ring and all of the parts associated to it with the exception of the SO-239 (the Female PL-259 connector)

    2) Adjust the length of the radiator so that it does not present a multiple of a quarter-wave on any frequency upon which you intend to operate (23-Ft. [7-m] is a good length).

    3) Place an outdoor weatherproof antenna tuning unit as close to the bottom of the antenna as possible, include the length of any hook-up wire from the ATU to the radiator in your length calculations and adjust the antenna length accordingly.

    4) Run at least three radials from the base of the antenna (the ground connection on the ATU) as long as possible; the more the better, the longer the better, resonant radials are best, but not necessary.

    5) Route a run of decent (RG-8 size or larger) coaxial transmission line along with the ATU control cable(s) from the ATU to your operating position and connect to your transceiver and if necessary the ATU control box.

    6) Adjust the transmit frequency to a portion of the band where you have privaleges, allow the automatic ATU to adjust to match the radiator to the transmission line, key mic and intone "CQ, CQ, CQ, this is N1BRU".

    Perhaps I'll see you down the log.
     
    Last edited: Jan 3, 2009
  9. K8MHZ

    K8MHZ Ham Member QRZ Page

    Release the hounds! :D
     
  10. W9PSK

    W9PSK Ham Member QRZ Page

    That depends on how badly you want to release the magic smoke trapped inside your radio. :D
     
  11. K8MHZ

    K8MHZ Ham Member QRZ Page

    You may be surprised!

    It's pretty hard to smoke a modern HT, and since the antenna in question is greater than a full wave, it may work better than a duck.

    I, for one, am not against at least trying it.

    That's what it's all about.
     
  12. KI6UMH

    KI6UMH Ham Member QRZ Page

    Okay Thank you for the information
     
  13. K9FON

    K9FON Guest

    Or it could even try to persuade one into qutting thier job and living on welfare in a crappy trailer court.
     
  14. W9PSK

    W9PSK Ham Member QRZ Page

    I tried it shortly after I got licensed. The SWR readings were through the roof, so I never tried it again. But, you can give it a shot and tell us how it works out.
     
  15. KI6UMH

    KI6UMH Ham Member QRZ Page

    I think i will just hold off an and buy a 2m 440 mag mount i don't want to risk messing up my radio especially seeing as how i do not have An SWR Meter at this time
     
  16. VO1GXG

    VO1GXG Ham Member QRZ Page

    i had a CB antenna i cut down to slightly less then a 1/4W on 2Meters and shorted the coil out. worked pretty good for my first antenna project.
     
  17. W4INF

    W4INF Ham Member QRZ Page

    If you put up a vertical copper pipe of some length, you can load it up and work it too. Probably better than any Cushcrap, etc..

    Andrew
     
  18. KA0GKT

    KA0GKT Ham Member QRZ Page

    And you base this statement upon what evidence?


    Yes, a straight piece of copper pipe or wire can be made into a perfectly good radiator; however you fail to take into consideration the following:

    1) He already has the antenna, he will probably need to buy the copper.

    2) The aluminum antenna will stand up to the wind far better than the Copper pipe.

    3) The copper pipe will require an insulator, the 11-meter Ringo already has an insulating section.

    4) The copper pipe will need some kind of mounting hardware, teh 11-meter ringo already is designed to mount on a mast.


    I must apologise in advance if I might seem a bit strident here; however poo-pooing a piece of aluminum simply because it came from a CB antenna is about as logical as dissing a General class operator because he was once a CBer or a No-Code Tech.
     
  19. VE3FMC

    VE3FMC XML Subscriber QRZ Page

    Feed it with 450 ohm ladder line. Lay down your ground radials, put one side of the ladder line to the radials, the other to the base of the antenna.

    Sure it might not be efficient on 40 meters but it should work ok from 20 meters up to 10.

    I have a 17 meter ground mounted vertical made from an old aluminum golf ball retriever and it works fine. I need to lay down more radials if I decide to keep using it. But it works, my first contact was Holland with 25 watts on SSB. Total cost, $0.00. The retriever was tossed out at the golf course I work at. I have one made for 20 meters too.

    My motto, if it is aluminum it can be made into some sort of antenna ;)
     
  20. W5DXP

    W5DXP Ham Member QRZ Page

    How does one achieve the balun function at the feedpoint (required by good engineering practice)?
     
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