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#1
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Hi, all.
I'm about to become a General class licensee, and I'm trying to work out a HF antenna plan for my new apartment. I have a small balcony on the top (4th) floor, which is good, but unfortunately there's a roof overhanging it and is 8' over the balcony floor and juts 4' out over the balcony edge, so a tall vertical is out of the question. What about a 'vertical' that is angled about 45 deg. down from vertical? Will that be good for phone DXing on any HF band? Also, sadly, the balcony is all metal and so is the top of the roof. What about some kind of loop? Thanks! ~swooz |
#2
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![]() "Swoozie Pellegrino" wrote in message ... Hi, all. I'm about to become a General class licensee, and I'm trying to work out a HF antenna plan for my new apartment. I have a small balcony on the top (4th) floor, which is good, but unfortunately there's a roof overhanging it and is 8' over the balcony floor and juts 4' out over the balcony edge, so a tall vertical is out of the question. What about a 'vertical' that is angled about 45 deg. down from vertical? Will that be good for phone DXing on any HF band? Also, sadly, the balcony is all metal and so is the top of the roof. What about some kind of loop? Thanks! ~swooz Try the Half Sloper if you could. It is quarter wave wire suspended between balcony and run at about 45 deg down to a tree or whatever. There is a good chance you will end up with 50 ohm impedance and can be fed directly with a coax, shield connected to metal railing or door frame and center wire to the antenna. Trim to frequency. Had one like that from the 9th floor at the hotel in Bahamas, worked very well. 73 Yuri, K3BU.us |
#3
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On Feb 12, 8:05*am, "Yuri Blanarovich" wrote:
"Swoozie Pellegrino" wrote in message ... Hi, all. I'm about to become a General class licensee, and I'm trying to work out a HF antenna plan for my new apartment. I have a small balcony on the top (4th) floor, which is good, but unfortunately there's a roof overhanging it and is 8' over the balcony floor and juts 4' out over the balcony edge, so a tall vertical is out of the question. What about a 'vertical' that is angled about 45 deg. down from vertical? *Will that be good for phone DXing on any HF band? Also, sadly, the balcony is all metal and so is the top of the roof. What about some kind of loop? Thanks! ~swooz Try the Half Sloper if you could. It is quarter wave wire suspended between balcony and run at about 45 deg down to a tree or whatever. There is a good chance you will end up with 50 ohm impedance and can be fed directly with a coax, shield connected to metal railing or door frame and center wire to the antenna. Trim to frequency. Had one like that from the 9th floor at the hotel in Bahamas, worked very well. 73 *Yuri, K3BU.us- Hide quoted text - - Show quoted text - Thanks, Yuri. Unfortunately, there's no good tree or pole to attach to below. There *is* a parking garage about 400 feet straight across from me though! LOL, would be a really long wire. I may try the dangling wire that Rick described earlier in this thread. I'll just have to figure out what fraction of 20m and 40m wavelengths that will work best with that and cut the wire(s) accordingly. I have about 50' of height to work with. Or maybe a MFJ-1622 clamped to the railing? http://www.eham.net/reviews/detail/2035 Thanks, ~swooz |
#4
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On Feb 11, 10:41*pm, Rick Frazier wrote:
Swoozie Pellegrino wrote: Hi, all. I'm about to become a General class licensee, and I'm trying to work out a HF antenna plan for my new apartment. I have a small balcony on the top (4th) floor, which is good, but unfortunately there's a roof overhanging it and is 8' over the balcony floor and juts 4' out over the balcony edge, so a tall vertical is out of the question. What about a 'vertical' that is angled about 45 deg. down from vertical? *Will that be good for phone DXing on any HF band? Also, sadly, the balcony is all metal and so is the top of the roof. What about some kind of loop? Thanks! ~swooz How about a vertical suspended from a hunk of plastic pipe ? *Try letting it hang down from the balcony, as far out as you can safely suspend it. *I've gotten away with using a 24 guage wire suspended with a collapsable/extendible fishing pole with reasonable results, compared to trying to use a short dipole inside a hotel room.... Though far from optimum, sometimes almost anything is better than nothing. --Rick AH7H- Hide quoted text - - Show quoted text - I could fashion a 24 gauge 1/2-wavelength 20m dipole, which I know about its footprint when strung horizontally at 1/2-wavelength above the ground, but is it of any use stood on end (as in dangled from my balcony and tapped in the center)? Thanks, ~swooz |
#5
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![]() "Swoozie Pellegrino" wrote in message ... On Feb 11, 10:41 pm, Rick Frazier wrote: Swoozie Pellegrino wrote: Hi, all. I'm about to become a General class licensee, and I'm trying to work out a HF antenna plan for my new apartment. I have a small balcony on the top (4th) floor, which is good, but unfortunately there's a roof overhanging it and is 8' over the balcony floor and juts 4' out over the balcony edge, so a tall vertical is out of the question. What about a 'vertical' that is angled about 45 deg. down from vertical? Will that be good for phone DXing on any HF band? Also, sadly, the balcony is all metal and so is the top of the roof. What about some kind of loop? Thanks! ~swooz How about a vertical suspended from a hunk of plastic pipe ? Try letting it hang down from the balcony, as far out as you can safely suspend it. I've gotten away with using a 24 guage wire suspended with a collapsable/extendible fishing pole with reasonable results, compared to trying to use a short dipole inside a hotel room.... Though far from optimum, sometimes almost anything is better than nothing. --Rick AH7H- Hide quoted text - - Show quoted text - I could fashion a 24 gauge 1/2-wavelength 20m dipole, which I know about its footprint when strung horizontally at 1/2-wavelength above the ground, but is it of any use stood on end (as in dangled from my balcony and tapped in the center)? Thanks, ~swooz Sure is -- tis a vertical dipole - works well at low heights where a horizontal dipole should be elevated above ground - half wavelength + Be sure to center tap it for proper impedance match. Not end fed. Feedline should be 90 deg from the dipole or as near as you can get it. I use a vertical dipole on six meters - works well Lamont |
#6
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On Feb 13, 8:28 am, Swoozie Pellegrino wrote:
On Feb 11, 10:41 pm, Rick Frazier wrote: Swoozie Pellegrino wrote: Hi, all. I'm about to become a General class licensee, and I'm trying to work out a HF antenna plan for my new apartment. I have a small balcony on the top (4th) floor, which is good, but unfortunately there's a roof overhanging it and is 8' over the balcony floor and juts 4' out over the balcony edge, so a tall vertical is out of the question. What about a 'vertical' that is angled about 45 deg. down from vertical? Will that be good for phone DXing on any HF band? Also, sadly, the balcony is all metal and so is the top of the roof. What about some kind of loop? Thanks! ~swooz How about a vertical suspended from a hunk of plastic pipe ? Try letting it hang down from the balcony, as far out as you can safely suspend it. I've gotten away with using a 24 guage wire suspended with a collapsable/extendible fishing pole with reasonable results, compared to trying to use a short dipole inside a hotel room.... Though far from optimum, sometimes almost anything is better than nothing. --Rick AH7H- Hide quoted text - - Show quoted text - I could fashion a 24 gauge 1/2-wavelength 20m dipole, which I know about its footprint when strung horizontally at 1/2-wavelength above the ground, but is it of any use stood on end (as in dangled from my balcony and tapped in the center)? Thanks, ~swooz When I was first licenced I lived in a 2 story apartment. For 20 - 10 meters I hung Clothes line pulleys at the end of both bedrooms (abotu 25 feet) and small diameter rope tween the pulleys. I then attached the GROUND side of the dipole and pulled it across letting the Center dangle down. Inverted L ..... and I worked 100+ countries and WAS on that little piece of wire. I used small copper wire, never ran more than 100W and it was near invisible even in daytime. Scotty W7PSK. |
#7
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R.Scott wrote:
When I was first licenced I lived in a 2 story apartment. For 20 - 10 meters I hung Clothes line pulleys at the end of both bedrooms (abotu 25 feet) and small diameter rope tween the pulleys. I then attached the GROUND side of the dipole and pulled it across letting the Center dangle down. Inverted L ..... and I worked 100+ countries and WAS on that little piece of wire. I used small copper wire, never ran more than 100W and it was near invisible even in daytime. Where did you have the feed point? Thanks, -- MGFoster:::mgf00 at earthlink decimal-point net Oakland, CA (USA) KI6OFN |
#8
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On Feb 13, 11:11*am, "The Shadow" wrote:
"Swoozie Pellegrino" wrote in message ... On Feb 11, 10:41 pm, Rick Frazier wrote: Swoozie Pellegrino wrote: Hi, all. I'm about to become a General class licensee, and I'm trying to work out a HF antenna plan for my new apartment. I have a small balcony on the top (4th) floor, which is good, but unfortunately there's a roof overhanging it and is 8' over the balcony floor and juts 4' out over the balcony edge, so a tall vertical is out of the question. What about a 'vertical' that is angled about 45 deg. down from vertical? Will that be good for phone DXing on any HF band? Also, sadly, the balcony is all metal and so is the top of the roof. What about some kind of loop? Thanks! ~swooz How about a vertical suspended from a hunk of plastic pipe ? Try letting it hang down from the balcony, as far out as you can safely suspend it. I've gotten away with using a 24 guage wire suspended with a collapsable/extendible fishing pole with reasonable results, compared to trying to use a short dipole inside a hotel room.... Though far from optimum, sometimes almost anything is better than nothing. --Rick AH7H- Hide quoted text - - Show quoted text - I could fashion a 24 gauge 1/2-wavelength 20m dipole, which I know about its footprint when strung horizontally at 1/2-wavelength above the ground, but is it of any use stood on end (as in dangled from my balcony and tapped in the center)? Thanks, ~swooz Sure is -- tis a vertical dipole - works well at low heights where a horizontal dipole should be elevated above ground - half wavelength + Be sure to center tap it for proper impedance match. Not end fed. Feedline should be 90 deg from the dipole or as near as you can get it. I use a vertical dipole on six meters - works well Lamont- Hide quoted text - - Show quoted text - Thanks for the info, Lamont. Well, it's going to be difficult to get that 90 deg angle at the central feed point, since the 'dipole' will be something like a 10-meter long magnet wire hanging from my balcony with a weight at the bottom. I could run coax down alongside for 5m and have it connect there in the center. Hmmm...wonder if a Buddipole clamped on my balcony railing and pointed out at a 45 deg angle will work better for me. Thanks, ~swooz |
#9
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On Thu, 14 Feb 2008 08:44:40 -0800 (PST), Swoozie Pellegrino
wrote: like a 10-meter long magnet wire hanging from my balcony with a weight at the bottom. I could run coax down alongside for 5m and have it connect there in the center. Make it 5 meter long wire hanging from the center conductor of a hanging 5+ meter long coax. 73's Richard Clark, KB7QHC |
#10
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Richard Clark wrote:
Swoozie Pellegrino wrote: like a 10-meter long magnet wire hanging from my balcony with a weight at the bottom. I could run coax down alongside for 5m and have it connect there in the center. Make it 5 meter long wire hanging from the center conductor of a hanging 5+ meter long coax. Or fold 1/4WL of the braid back down over itself leaving 1/4WL of the insulated center conductor to hang down. It's called a sleeve dipole. -- 73, Cecil http://www.w5dxp.com |
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