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Full Wave Horizontal Loop
Built one this morning for 10 Mhz (99 feet). Took about 15 minutes. It
works pretty well only 10' up. I'm going to put a bigger one on the roof. Very low noise. Costs nothing. (You can drive the feedpoint with a CATV balun, I'm using a 4:1 LDG balun). VSWR is about 3:1 from 7 Mhz to 15 Mhz with a little dip at 9.9 MHz (resonance). As this is a receive only antenna I didn't bother trimming for absolute minimem VSWR. I didn't test lower with the bridge, but I can get KFI (0.64 MHz) on it. I hear very little QRM on the loop. http://www.radioworks.com/nloop.html |
Full Wave Horizontal Loop
On Feb 4, 4:03*pm, dave wrote:
Built one this morning for 10 Mhz (99 feet). Took about 15 minutes. It works pretty well only 10' up. I'm going to put a bigger one on the roof. Very low noise. Costs nothing. (You can drive the feedpoint with a CATV balun, I'm using a 4:1 LDG balun). VSWR is about 3:1 from 7 Mhz to 15 Mhz with a little dip at 9.9 MHz (resonance). As this is a receive only antenna I didn't bother trimming for absolute minimem VSWR. *I didn't test lower with the bridge, but I can get KFI (0.64 MHz) on it. I hear very little QRM on the loop. http://www.radioworks.com/nloop.html Dave, OK so it's a called "Sky-Wire" Full Wave {Length} Horizontal Loop Antenna http://n1su.com/loop.html http://www.k5rcd.org/hor%20loop%20instruct.htm |
Full Wave Horizontal Loop
On 02/05/2011 09:37 AM, RHF wrote:
On Feb 4, 4:03 pm, wrote: Built one this morning for 10 Mhz (99 feet). Took about 15 minutes. It works pretty well only 10' up. I'm going to put a bigger one on the roof. Very low noise. Costs nothing. (You can drive the feedpoint with a CATV balun, I'm using a 4:1 LDG balun). VSWR is about 3:1 from 7 Mhz to 15 Mhz with a little dip at 9.9 MHz (resonance). As this is a receive only antenna I didn't bother trimming for absolute minimem VSWR. I didn't test lower with the bridge, but I can get KFI (0.64 MHz) on it. I hear very little QRM on the loop. http://www.radioworks.com/nloop.html Dave, OK so it's a called "Sky-Wire" Full Wave {Length} Horizontal Loop Antenna http://n1su.com/loop.html http://www.k5rcd.org/hor%20loop%20instruct.htm . -or- Loop 'Sky-Wire' Antenna http://srgproperties.inetusanow.net/.../9467_2192.pdf . "Sky-Wires" come in Odd and Random Shapes . . . http://www.qsl.net/kc8opv/antennas/s...oop/index.html . 171-Meter Loop Skywire Antenna for PSK http://www.eham.net/articles/17512 . The Delta Loop (Sky-Wire) Antenna http://dk5ec.de/deltaloop-eng.htm Delta Loop : 3-Sided using only 3 Mounting/Rigging Points =out+across+back= . Sky Wave {Skywave} http://en.wikipedia.org/wiki/Skywave . "NVIS" = Near Vertical Incident Skywave Antenna http://www.qsl.net/wb5ude/nvis/ http://www.w0ipl.net/ECom/NVIS/nvis.htm http://en.wikipedia.org/wiki/Near_Ve...idence_Skywave . iane ~ RHF . . Sky-Wire Loop Antenna : Yahoo Group ~1200 Members http://groups.yahoo.com/group/SkyWires/ "NVIS" = Near Vertical Incident Skywave Antenna http://en.wikipedia.org/wiki/Near_Ve...idence_Skywave . K9AY Terminated Loop Antenna: Yahoo Group ~900 Members http://groups.yahoo.com/group/K9AYloop/ . Loop Antenna News and Information Forum : Yahoo Group +3100 Members http://groups.yahoo.com/group/loopantennas/ . Amateur Radio "HAM" Antennas : Yahoo Group ~2400 Members http://groups.yahoo.com/group/ham-antennas/ . SEARCH Yahoo Group -for- Loop Antennas http://groups.yahoo.com/search?query...a&sort=members . Shortwave Listeners (SWL) Antennas : Yahoo Group ~5000 Members +plus+ AM/FM Antennas http://groups.yahoo.com/group/Shortwave-SWL-Antenna/ . Windom Antenna : Yahoo Group ~800 Members +plus+ Off-Center-Fed (OCF) Dipole Antennas http://groups.yahoo.com/group/windom_antenna/ . . Leave it to you to make a 99 foot full wave loop of wire complicated. |
Full Wave Horizontal Loop
On Feb 5, 9:40*am, dave wrote:
On 02/05/2011 09:37 AM, RHF wrote: On Feb 4, 4:03 pm, *wrote: Built one this morning for 10 Mhz (99 feet). Took about 15 minutes. It works pretty well only 10' up. I'm going to put a bigger one on the roof. Very low noise. Costs nothing. (You can drive the feedpoint with a CATV balun, I'm using a 4:1 LDG balun). VSWR is about 3:1 from 7 Mhz to 15 Mhz with a little dip at 9.9 MHz (resonance). As this is a receive only antenna I didn't bother trimming for absolute minimem VSWR. *I didn't test lower with the bridge, but I can get KFI (0.64 MHz) on it. I hear very little QRM on the loop. http://www.radioworks.com/nloop.html Dave, OK so it's a called "Sky-Wire" Full Wave {Length} Horizontal Loop Antenna http://n1su.com/loop.html http://www.k5rcd.org/hor%20loop%20instruct.htm * . -or- Loop 'Sky-Wire' Antenna http://srgproperties.inetusanow.net/.../9467_2192.pdf * . "Sky-Wires" come in Odd and Random Shapes . . . http://www.qsl.net/kc8opv/antennas/s...oop/index.html * . 171-Meter Loop Skywire Antenna for PSK http://www.eham.net/articles/17512 * . The Delta Loop (Sky-Wire) Antenna http://dk5ec.de/deltaloop-eng.htm Delta Loop : 3-Sided using only 3 Mounting/Rigging Points =out+across+back= * . Sky Wave {Skywave} http://en.wikipedia.org/wiki/Skywave * . "NVIS" = Near Vertical Incident Skywave Antenna http://www.qsl.net/wb5ude/nvis/ http://www.w0ipl.net/ECom/NVIS/nvis.htm http://en.wikipedia.org/wiki/Near_Ve...idence_Skywave * . iane ~ RHF * . * . Sky-Wire Loop Antenna : Yahoo Group ~1200 Members http://groups.yahoo.com/group/SkyWires/ "NVIS" = Near Vertical Incident Skywave Antenna http://en.wikipedia.org/wiki/Near_Ve...idence_Skywave * . K9AY Terminated Loop Antenna: Yahoo Group ~900 Members http://groups.yahoo.com/group/K9AYloop/ * . Loop Antenna News and Information Forum : Yahoo Group +3100 Members http://groups.yahoo.com/group/loopantennas/ * . Amateur Radio "HAM" Antennas : Yahoo Group ~2400 Members http://groups.yahoo.com/group/ham-antennas/ * . SEARCH Yahoo Group -for- Loop Antennas http://groups.yahoo.com/search?query...a&sort=members * . Shortwave Listeners (SWL) Antennas : Yahoo Group ~5000 Members +plus+ AM/FM Antennas http://groups.yahoo.com/group/Shortwave-SWL-Antenna/ * . Windom Antenna *: Yahoo Group ~800 Members +plus+ Off-Center-Fed (OCF) Dipole Antennas http://groups.yahoo.com/group/windom_antenna/ * . * . Leave it to you to make a 99 foot full wave loop of wire complicated. Is the reception decent on 80m? I bet it's killer on 30. |
Full Wave Horizontal Loop
On 02/05/2011 05:51 PM, bpnjensen wrote:
On Feb 5, 9:40 am, wrote: On 02/05/2011 09:37 AM, RHF wrote: On Feb 4, 4:03 pm, wrote: Built one this morning for 10 Mhz (99 feet). Took about 15 minutes. It works pretty well only 10' up. I'm going to put a bigger one on the roof. Very low noise. Costs nothing. (You can drive the feedpoint with a CATV balun, I'm using a 4:1 LDG balun). VSWR is about 3:1 from 7 Mhz to 15 Mhz with a little dip at 9.9 MHz (resonance). As this is a receive only antenna I didn't bother trimming for absolute minimem VSWR. I didn't test lower with the bridge, but I can get KFI (0.64 MHz) on it. I hear very little QRM on the loop. http://www.radioworks.com/nloop.html Dave, OK so it's a called "Sky-Wire" Full Wave {Length} Horizontal Loop Antenna http://n1su.com/loop.html http://www.k5rcd.org/hor%20loop%20instruct.htm . -or- Loop 'Sky-Wire' Antenna http://srgproperties.inetusanow.net/.../9467_2192.pdf . "Sky-Wires" come in Odd and Random Shapes . . . http://www.qsl.net/kc8opv/antennas/s...oop/index.html . 171-Meter Loop Skywire Antenna for PSK http://www.eham.net/articles/17512 . The Delta Loop (Sky-Wire) Antenna http://dk5ec.de/deltaloop-eng.htm Delta Loop : 3-Sided using only 3 Mounting/Rigging Points =out+across+back= . Sky Wave {Skywave} http://en.wikipedia.org/wiki/Skywave . "NVIS" = Near Vertical Incident Skywave Antenna http://www.qsl.net/wb5ude/nvis/ http://www.w0ipl.net/ECom/NVIS/nvis.htm http://en.wikipedia.org/wiki/Near_Ve...idence_Skywave . iane ~ RHF . . Sky-Wire Loop Antenna : Yahoo Group ~1200 Members http://groups.yahoo.com/group/SkyWires/ "NVIS" = Near Vertical Incident Skywave Antenna http://en.wikipedia.org/wiki/Near_Ve...idence_Skywave . K9AY Terminated Loop Antenna: Yahoo Group ~900 Members http://groups.yahoo.com/group/K9AYloop/ . Loop Antenna News and Information Forum : Yahoo Group +3100 Members http://groups.yahoo.com/group/loopantennas/ . Amateur Radio "HAM" Antennas : Yahoo Group ~2400 Members http://groups.yahoo.com/group/ham-antennas/ . SEARCH Yahoo Group -for- Loop Antennas http://groups.yahoo.com/search?query...a&sort=members . Shortwave Listeners (SWL) Antennas : Yahoo Group ~5000 Members +plus+ AM/FM Antennas http://groups.yahoo.com/group/Shortwave-SWL-Antenna/ . Windom Antenna : Yahoo Group ~800 Members +plus+ Off-Center-Fed (OCF) Dipole Antennas http://groups.yahoo.com/group/windom_antenna/ . . Leave it to you to make a 99 foot full wave loop of wire complicated. Is the reception decent on 80m? I bet it's killer on 30. I made it for my 30 m autospotter. It's noisy on 80, very quiet on 30. On 80 I don't think it has any radiation resistance being less than a half wave and balanced. If you have a rotator or don't mind doing yourself you can make killer receive only loops only a couple feet across. I wanted something I didn't have to aim. |
Full Wave Horizontal Loop
On 02/07/2011 08:10 AM, RHF wrote:
Dave, Instead of running the Coax Cable up to the Wire of the Loop Antenna and Feeding the Loop Antenna at the Top. Try Feeding the Loop at Ground Level with 450 Ohm Ladder Line or 300 Ohm Twin Lead from the LDG Balun located on the Ground up to the Wire Loop Antenna. Gawd I hope you're kidding. The feed point is under the fascia out back. It is maybe 9' up. The BalUn is hanging on a screw hook with either end of the loop held in place by staples and attached to the BalUn. A 10 year old prefab 50' Radio Shack RF cable goes to my MFJ feedthrough. It works great on 10.140 MHz and above, below that the noise-reduction capabilities suffer. I do not want a rhombic antenna. I have a steerable vertical array. |
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