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#1
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I think that everyone on this forum has missed the point.
The op does not understand how antenna's works, is stuck in the CB radio and won't listen to reason. A 9' long Ringo is 6 meters - 50 MHz. It is also a 1/4 wave antenna for 27 MHz but will not work for 11 meters, because the impedance is all wrong - almost 5:1 VSWR.... When you shorten a antenna that is designed to work on another frequency, the design has to match in order for it to work and have the right impedance and be resonant. A full wave antenna, other then a dipole antenna is not a balanced load. The ring on the Ringo is the match, and the ring is around 32 inches long. You have to subtract 30 inches from the total length - which a resonant antenna would only be about 40 inches long. That doesn't leave much of a stub sticking up for a vertical radiator. I gave away a HALO antenna for two meters, for working SSB and digital modes and the diameter of it was only about 24 inches. Making a antenna is not as simple as just sticking something up in the air and connecting the coax to it and cutting off the excessive length and expecting it to work, like a mobile CB radio antenna........ Who was it that said, you can't fix stupid! Buy a 2 meter antenna, forget about trying to make something out of your CB radio crap to save a couple of bucks. What you could do is buy the ARRL antenna book and make a 4 element beam antenna out of the antenna segments of the Ringo if you had a piece of box tubing - antenna boom and a Gamma Match..
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#2
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Ok
So the 11 meter ringo wont work after shortening and tuning and pruning for 2m. Other than making a beam out of it like you suggest, is there anything I can transform it into? I don't want it for cb, just 2m. You are right, there is a lot more to know about making antennas then what I am doing, I wont dispute that. I only want to know some good ideas or practical ideas for this clean antenna. Yes, I could buy a new antenna, but I don't want to. Thanks,, 73s "Channel Jumper" wrote in message ... I think that everyone on this forum has missed the point. The op does not understand how antenna's works, is stuck in the CB radio and won't listen to reason. A 9' long Ringo is 6 meters - 50 MHz. It is also a 1/4 wave antenna for 27 MHz but will not work for 11 meters, because the impedance is all wrong - almost 5:1 VSWR.... When you shorten a antenna that is designed to work on another frequency, the design has to match in order for it to work and have the right impedance and be resonant. A full wave antenna, other then a dipole antenna is not a balanced load. The ring on the Ringo is the match, and the ring is around 32 inches long. You have to subtract 30 inches from the total length - which a resonant antenna would only be about 40 inches long. That doesn't leave much of a stub sticking up for a vertical radiator. I gave away a HALO antenna for two meters, for working SSB and digital modes and the diameter of it was only about 24 inches. Making a antenna is not as simple as just sticking something up in the air and connecting the coax to it and cutting off the excessive length and expecting it to work, like a mobile CB radio antenna........ Who was it that said, you can't fix stupid! Buy a 2 meter antenna, forget about trying to make something out of your CB radio crap to save a couple of bucks. What you could do is buy the ARRL antenna book and make a 4 element beam antenna out of the antenna segments of the Ringo if you had a piece of box tubing - antenna boom and a Gamma Match.. -- Channel Jumper |
#3
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On Sun, 27 Jan 2013 21:36:14 +0000, Channel Jumper
wrote: I think that everyone on this forum has missed the point. The op does not understand how antenna's works, is stuck in the CB radio and won't listen to reason. Have you ever posted anything that didn't begin by insulting the person you were allegedly trying to help? May I suggest you drop the intro for no better reason than improving your credibility. A 9' long Ringo is 6 meters - 50 MHz. It is also a 1/4 wave antenna for 27 MHz but will not work for 11 meters, because the impedance is all wrong - almost 5:1 VSWR.... The CB version of the Ringo Ranger is 7 meters (23 ft) long or 5/8 wave at 27Mhz. See link at bottom. It could best be used as an HF vertical (with an antenna tuner). When you shorten a antenna that is designed to work on another frequency, the design has to match in order for it to work and have the right impedance and be resonant. Half right. It should be the correct antenna, but not necessarily resonant at the operating frequency. Minimum VSWR is not the same as resonance. You can easily have minimum VSWR and still have some reactive components left, while the definition of resonance is where the inductive and capacitive components cancel, leaving a purely resistive antenna impedance. A full wave antenna, other then a dipole antenna is not a balanced load. The ring on the Ringo is the match, and the ring is around 32 inches long. You have to subtract 30 inches from the total length - which a resonant antenna would only be about 40 inches long. That doesn't leave much of a stub sticking up for a vertical radiator. Throw the ring match thing away. I gave away a HALO antenna for two meters, for working SSB and digital modes and the diameter of it was only about 24 inches. Hmmm... Circumference = 24" * Pi = 75 inches = 1.9 meters. Ok, full wave loop antenna. Making a antenna is not as simple as just sticking something up in the air and connecting the coax to it and cutting off the excessive length and expecting it to work, like a mobile CB radio antenna........ Actually, making a piece of metal into an antenna is that simple, but only if you understand how to match the transmitter impedance to the antennas almost random impedance. See my comments to Tom in this thread. However, convincing that antenna to direct its energies in a useful direction is far more difficult. Who was it that said, you can't fix stupid! They were wrong. Many stupid people have risen to high office and position. Fixing the damage they've done is difficult, but still possible with a change of administration. Buy a 2 meter antenna, forget about trying to make something out of your CB radio crap to save a couple of bucks. That would probably be the easy way. However, learning and progress has never followed the easy path. What you could do is buy the ARRL antenna book and make a 4 element beam antenna out of the antenna segments of the Ringo if you had a piece of box tubing - antenna boom and a Gamma Match.. Good idea, but I would hate to cut up an antenna worth $1500: http://articulo.mercadolibre.com.mx/MLM-410527401-antena-para-cb-de-base-ringo-ranger-con-envio-gratis-_JM -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
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