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"Arnie Coro Antenna"
I built this years ago as a quick antenna for receiving and transmitting. It is name after Havana Cuba's Arnie Coro, since He came up with it over 20 years ago.
1. Take a 45 ft/15 meter 52 ohm Coax, or multiples up or down. 2. Dress it as center conductor and braid on both ends. 3. Solder a 50 OHM resisitor on one end, connecting the center and the braid. 4. On the other end, solder a piece of coax. with braid to center conductor, center conductor to braid. On the other end, solder a PL-259, or whatever your rig accepts.. Then connect it to your receiver/transmitter. 5. You now have a balanced, low noise antenna. I would suggest a 10 watt or hgher resistor for the amount of power you are going to use if transmitting.
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Extra Class Volunteer Examiner ARRL Instructor |
#2
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"Arnie Coro Antenna"
On Feb 4, 4:15*pm, KE5LDO wrote:
I built this years ago as a quick antenna for receiving and transmitting. It is name after Havana Cuba's Arnie Coro, since He came up with it over 20 years ago. 1. Take a 45 ft/15 meter 52 ohm Coax, or multiples up or down. 2. *Dress it as center conductor and braid on both ends. 3. Solder a 50 OHM resisitor on one end, connecting the center and the braid. 4. *On the other end, solder a piece of coax. with braid to center conductor, center conductor to braid. On the other end, solder a PL-259, or whatever your rig accepts.. Then connect it to your receiver/transmitter. 5. You now have a balanced, low noise antenna. *I would suggest a 10 watt or hgher resistor for the amount of power you are going to use if transmitting. -- KE5LDO It's not April 1, 2009 yet... :/ |
#3
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"Arnie Coro Antenna"
On Wed, 4 Feb 2009 22:15:09 +0000, KE5LDO
wrote: I built this years ago as a quick antenna for receiving and transmitting. It is name after Havana Cuba's Arnie Coro, since He came up with it over 20 years ago. Did Fidel put Arnie against the wall when he published how to construct a TRANSMITTING antenna? He should have if for no other reason than the arbitrary instructions: 1. Take a 45 ft/15 meter 52 ohm Coax, or multiples up or down. What significance is 45 feet (or 15 meters)? Is this a magic number? 2. Dress it as center conductor and braid on both ends. Dress right, or dress left? 3. Solder a 50 OHM resisitor on one end, connecting the center and the braid. Wouldn't a 50 Ohm resistor present a SWR of 1.04:1? This isn't about efficiency, is it? 4. On the other end, solder a piece of coax. with braid to center conductor, center conductor to braid. On the other end, solder a PL-259, or whatever your rig accepts.. Then connect it to your receiver/transmitter. Shouldn't this be 4(a) and 4(b)? For 4(a) What happened to the resistor? For 4(b) Why the connector? Just run the existing line out to 4(a) 5. You now have a balanced, low noise antenna. I would suggest a 10 watt or hgher resistor for the amount of power you are going to use if transmitting. Why would you use a resistor for receiving? If it were for transmitting, I can see why Cuba is still under domination by the Castros. Something must have been lost in translation - or maybe the process of getting through the communist censors. Perhaps this was the CIA antenna design for the Bay of Pigs. 73's Richard Clark, KB7QHC |
#4
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"Arnie Coro Antenna"
Richard Clark wrote:
On Wed, 4 Feb 2009 22:15:09 +0000, KE5LDO wrote: I built this years ago as a quick antenna for receiving and transmitting. It is name after Havana Cuba's Arnie Coro, since He came up with it over 20 years ago. Did Fidel put Arnie against the wall when he published how to construct a TRANSMITTING antenna? He should have if for no other reason than the arbitrary instructions: 1. Take a 45 ft/15 meter 52 ohm Coax, or multiples up or down. What significance is 45 feet (or 15 meters)? Is this a magic number? 2. Dress it as center conductor and braid on both ends. Dress right, or dress left? 3. Solder a 50 OHM resisitor on one end, connecting the center and the braid. Wouldn't a 50 Ohm resistor present a SWR of 1.04:1? This isn't about efficiency, is it? 4. On the other end, solder a piece of coax. with braid to center conductor, center conductor to braid. On the other end, solder a PL-259, or whatever your rig accepts.. Then connect it to your receiver/transmitter. Shouldn't this be 4(a) and 4(b)? For 4(a) What happened to the resistor? For 4(b) Why the connector? Just run the existing line out to 4(a) 5. You now have a balanced, low noise antenna. I would suggest a 10 watt or hgher resistor for the amount of power you are going to use if transmitting. Why would you use a resistor for receiving? If it were for transmitting, I can see why Cuba is still under domination by the Castros. Something must have been lost in translation - or maybe the process of getting through the communist censors. Perhaps this was the CIA antenna design for the Bay of Pigs. 73's Richard Clark, KB7QHC You can look up Arnie's website on Google, go there, and read for yourself what Arnie's idea of an antenna is. The poster is pulling a fast one. 73, Tom Donaly, KA6RUH |
#5
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"Arnie Coro Antenna"
"Tom Donaly" wrote in message ... You can look up Arnie's website on Google, go there, and read for yourself what Arnie's idea of an antenna is. The poster is pulling a fast one. Arnie Coro's website does discuss the item described. http://www.mail-archive.com/hard-cor.../msg18595.html He doesn't claim it works well (nor should he). At one point he describes burying it to stealth it. When I was moving an antenna, I had both dipole elements laying on the ground but still connected. Just for laughs, I tuned it up. I could hear a few other people but nobody could hear me. I think burying an HF antenna should be followed by a shopping trip for some writing paper and stamps. You'll need 'em. |
#6
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"Arnie Coro Antenna"
Sal M. Onella wrote:
Arnie Coro's website does discuss the item described. http://www.mail-archive.com/hard-cor.../msg18595.html He doesn't claim it works well (nor should he). At one point he describes burying it to stealth it. When I was moving an antenna, I had both dipole elements laying on the ground but still connected. Just for laughs, I tuned it up. I could hear a few other people but nobody could hear me. I think burying an HF antenna should be followed by a shopping trip for some writing paper and stamps. You'll need 'em. Buried antennas were seriously investigated by the military some time ago, and are probably still in use. While terribly inefficient, some can radiate enough to be useful, and invisibility can be an asset. I was told long ago that the reason NEC-4 was prohibited for export for so long was that it could be used for designing buried and therefore invisible antennas. Roy Lewallen, W7EL |
#7
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"Arnie Coro Antenna"
Roy Lewallen wrote:
Sal M. Onella wrote: Arnie Coro's website does discuss the item described. http://www.mail-archive.com/hard-cor.../msg18595.html He doesn't claim it works well (nor should he). At one point he describes burying it to stealth it. When I was moving an antenna, I had both dipole elements laying on the ground but still connected. Just for laughs, I tuned it up. I could hear a few other people but nobody could hear me. I think burying an HF antenna should be followed by a shopping trip for some writing paper and stamps. You'll need 'em. Buried antennas were seriously investigated by the military some time ago, and are probably still in use. While terribly inefficient, some can radiate enough to be useful, and invisibility can be an asset. I was told long ago that the reason NEC-4 was prohibited for export for so long was that it could be used for designing buried and therefore invisible antennas. Actually, I think it was the NEC 3 variant that first introduced buried wires, and was classified as Defense Critical Technology. "The only difference in the capabilities of these codes is that NEC-3 can model wires that are buried or penetrate from air into the ground, while NEC-2 is limited to antennas in free space or above a ground plane." from Burke's NEC validation paper published at that conference in Ankara Turkey in 1989. That paper also mentions an experimental version NEC3VLF (improving performance for electrically small antennas), NEC4X (better modeling of endcaps), NEC3I (for insulated wires), NEC-GS (ground screens), etc., all of which probably wound up in NEC4 in one way or another. A notable export controlled application of such codes is modeling wires submerged in seawater. The export controls still exist, by the way, for NEC4.. when you get a copy, don't you have to certify who the end user is? and agree to ITAR compliance, etc. https://ipo.llnl.gov/technology/soft...uments/NEC.pdf Roy Lewallen, W7EL |
#8
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"Arnie Coro Antenna"
"Roy Lewallen" wrote in message ine... Buried antennas were seriously investigated by the military some time ago, and are probably still in use. While terribly inefficient, some can radiate enough to be useful, and invisibility can be an asset. Agree. I didn't mean to imply that a buried antenna wouldn't work at all. Dirt's not a perfect shield material, which is what would be required for zero radiation. |
#9
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"Arnie Coro Antenna"
On Wed, 04 Feb 2009 16:56:30 -0800, Richard Clark
wrote: On Wed, 4 Feb 2009 22:15:09 +0000, KE5LDO wrote: I built this years ago as a quick antenna for receiving and transmitting. It is name after Havana Cuba's Arnie Coro, since He came up with it over 20 years ago. Did Fidel put Arnie against the wall when he published how to construct a TRANSMITTING antenna? He should have if for no other reason than the arbitrary instructions: 1. Take a 45 ft/15 meter 52 ohm Coax, or multiples up or down. What significance is 45 feet (or 15 meters)? Is this a magic number? 2. Dress it as center conductor and braid on both ends. Dress right, or dress left? 3. Solder a 50 OHM resisitor on one end, connecting the center and the braid. Wouldn't a 50 Ohm resistor present a SWR of 1.04:1? This isn't about efficiency, is it? 4. On the other end, solder a piece of coax. with braid to center conductor, center conductor to braid. On the other end, solder a PL-259, or whatever your rig accepts.. Then connect it to your receiver/transmitter. Shouldn't this be 4(a) and 4(b)? For 4(a) What happened to the resistor? For 4(b) Why the connector? Just run the existing line out to 4(a) 5. You now have a balanced, low noise antenna. I would suggest a 10 watt or hgher resistor for the amount of power you are going to use if transmitting. Why would you use a resistor for receiving? If it were for transmitting, I can see why Cuba is still under domination by the Castros. Something must have been lost in translation - or maybe the process of getting through the communist censors. Perhaps this was the CIA antenna design for the Bay of Pigs. 73's Richard Clark, KB7QHC no no, that is the perfect example of a dummy load with a radiating cable. w. |
#10
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"Arnie Coro Antenna"
"Helmut Wabnig" hwabnig@ .- --- -. dotat wrote in message ... On Wed, 04 Feb 2009 16:56:30 -0800, Richard Clark wrote: On Wed, 4 Feb 2009 22:15:09 +0000, KE5LDO wrote: I built this years ago as a quick antenna for receiving and transmitting. It is name after Havana Cuba's Arnie Coro, since He came up with it over 20 years ago. Did Fidel put Arnie against the wall when he published how to construct a TRANSMITTING antenna? He should have if for no other reason than the arbitrary instructions: 1. Take a 45 ft/15 meter 52 ohm Coax, or multiples up or down. What significance is 45 feet (or 15 meters)? Is this a magic number? 2. Dress it as center conductor and braid on both ends. Dress right, or dress left? 3. Solder a 50 OHM resisitor on one end, connecting the center and the braid. Wouldn't a 50 Ohm resistor present a SWR of 1.04:1? This isn't about efficiency, is it? 4. On the other end, solder a piece of coax. with braid to center conductor, center conductor to braid. On the other end, solder a PL-259, or whatever your rig accepts.. Then connect it to your receiver/transmitter. Shouldn't this be 4(a) and 4(b)? For 4(a) What happened to the resistor? For 4(b) Why the connector? Just run the existing line out to 4(a) 5. You now have a balanced, low noise antenna. I would suggest a 10 watt or hgher resistor for the amount of power you are going to use if transmitting. Why would you use a resistor for receiving? If it were for transmitting, I can see why Cuba is still under domination by the Castros. Something must have been lost in translation - or maybe the process of getting through the communist censors. Perhaps this was the CIA antenna design for the Bay of Pigs. 73's Richard Clark, KB7QHC no no, that is the perfect example of a dummy load with a radiating cable. w. - At one time, I lived in an apartment and used a similar, shorter antenna for 2 meter operation via a repeater. It was easy to build, and worked fine because I didn't need much signal to hit the repeater. --Wayne |
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