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Horizontal Loop for 2m SSB
http://search.yahoo.com/search;_ylt=...20meter%20halo
Myself I'd probably stick a small 3 el yagi on that lamp mast if you had room.. Good bit more punch for SSB, and being things are reciprocal, it will improve reception. If you squeeze an extra 6 db from the antenna system, that's like taking 50 watts and turning it to 200. Best deal on an "amp" you will find.. :) I'm not sure the gain using a halo, but I suspect it's probably pretty close to a dipole. Maybe a tad more, but it's not going to be a drastic difference. A loop has some gain broadside vs a dipole, but I'm not sure what you get running one on it's side. |
Horizontal Loop for 2m SSB
On 5/7/2011 7:58 PM, wrote:
http://search.yahoo.com/search;_ylt=...20meter%20halo Myself I'd probably stick a small 3 el yagi on that lamp mast if you had room.. Good bit more punch for SSB, and being things are reciprocal, it will improve reception. If you squeeze an extra 6 db from the antenna system, that's like taking 50 watts and turning it to 200. Best deal on an "amp" you will find.. :) I'm not sure the gain using a halo, but I suspect it's probably pretty close to a dipole. Maybe a tad more, but it's not going to be a drastic difference. A loop has some gain broadside vs a dipole, but I'm not sure what you get running one on it's side. I forgot that the OP wanted horizontal polarization. Well, if it were me, I'd make the loop vertical and feed the bottom center. That will produce a horizontally polarized signal much better than the horizontal loop and with about the same directivity. John |
Horizontal Loop for 2m SSB
On 08/05/2011 04:08, John KD5YI wrote:
On 5/7/2011 7:58 PM, wrote: http://search.yahoo.com/search;_ylt=...20meter%20halo Myself I'd probably stick a small 3 el yagi on that lamp mast if you had room.. Good bit more punch for SSB, and being things are reciprocal, it will improve reception. If you squeeze an extra 6 db from the antenna system, that's like taking 50 watts and turning it to 200. Best deal on an "amp" you will find.. :) I'm not sure the gain using a halo, but I suspect it's probably pretty close to a dipole. Maybe a tad more, but it's not going to be a drastic difference. A loop has some gain broadside vs a dipole, but I'm not sure what you get running one on it's side. I forgot that the OP wanted horizontal polarization. Well, if it were me, I'd make the loop vertical and feed the bottom center. That will produce a horizontally polarized signal much better than the horizontal loop and with about the same directivity. John A 'Halo' is the usual answer, or if more space is available crossed dipoles. Jeff |
Horizontal Loop for 2m SSB
wrote in message ... http://search.yahoo.com/search;_ylt=...20meter%20halo Myself I'd probably stick a small 3 el yagi on that lamp mast if you had room.. Good bit more punch for SSB, and being things are reciprocal, it will improve reception. If you squeeze an extra 6 db from the antenna system, that's like taking 50 watts and turning it to 200. Best deal on an "amp" you will find.. :) I'm not sure the gain using a halo, but I suspect it's probably pretty close to a dipole. Maybe a tad more, but it's not going to be a drastic difference. A loop has some gain broadside vs a dipole, but I'm not sure what you get running one on it's side. Thanks much. I'll have a look at that link and see what's what. The Yagi would be nice, but running out on the balcony and moving it around all the time isn't practical. That's why I wanted something fairly omnidirectional, as much of "omni" as I can get, anyway. Since I remember what my communications instructor told us about loops (they radiate equally poorly in all directions g), I figured this would be the most practical solution for what I want to do. -- -- 73 DE Tom Rutherford, N8EUJ, Burton, MI "She said it was either her or the ham radio. Over." |
Horizontal Loop for 2m SSB
On 5/7/2011 9:51 PM, John KD5YI wrote:
Not very good. Most of the RF goes up. It is particularly bad along the axis of the driven wire (assumes wire driven in the center). Not quite as bad normal to that axis. Might be improvable by feeding the corner. I think a simple vertical would do better. Cheers, John Not for SSB it wouldn't. 20dB or so isolation V to H. Useless unless within less than normal FM range. On the flip side I've done well over 100 miles car to car with single halos on each end with roughly 80 watts. And up to 200 with 2 stacked halos (3 foot stacking, not much really) to a single 3 wavelength yagi on the other end. Not a one time thing, I used to drive NNY at about 1000 miles per week doing service during the early 80's. There are better things than the halo. The omni-angles are quite a bit better, especially on the pattern and are simple and rugged. Less than 1 dB gain change over 360 degrees toward the horizon. A Motorola design (that I don't remember them using) that got re-purposed for amateur. And then there's the Big Wheel and a modern twist on it that is even better and smaller. tom K0TAR |
Horizontal Loop for 2m SSB
On 5/8/2011 10:22 AM, Tom Rutherford wrote:
wrote in message ... http://search.yahoo.com/search;_ylt=...20meter%20halo Myself I'd probably stick a small 3 el yagi on that lamp mast if you had room.. Good bit more punch for SSB, and being things are reciprocal, it will improve reception. If you squeeze an extra 6 db from the antenna system, that's like taking 50 watts and turning it to 200. Best deal on an "amp" you will find.. :) I'm not sure the gain using a halo, but I suspect it's probably pretty close to a dipole. Maybe a tad more, but it's not going to be a drastic difference. A loop has some gain broadside vs a dipole, but I'm not sure what you get running one on it's side. Thanks much. I'll have a look at that link and see what's what. The Yagi would be nice, but running out on the balcony and moving it around all the time isn't practical. That's why I wanted something fairly omnidirectional, as much of "omni" as I can get, anyway. Since I remember what my communications instructor told us about loops (they radiate equally poorly in all directionsg), I figured this would be the most practical solution for what I want to do. A horizontal dipole in front of a screen or single reflector would have a "pattern" that is 100+ degrees wide. Stack a couple vertically, say a meter apart, and you squeeze the vertical beam width significantly, which is probably what you want. What you *might* want to do is look for a low gain TV antenna for the upper VHF bands (e.g. Channel 7-13): one of those two bay things with a bowtie in front of a screen. |
Horizontal Loop for 2m SSB
"Jim Lux" wrote in message ... On 5/8/2011 10:22 AM, Tom Rutherford wrote: wrote in message ... http://search.yahoo.com/search;_ylt=...20meter%20halo Myself I'd probably stick a small 3 el yagi on that lamp mast if you had room.. Good bit more punch for SSB, and being things are reciprocal, it will improve reception. If you squeeze an extra 6 db from the antenna system, that's like taking 50 watts and turning it to 200. Best deal on an "amp" you will find.. :) I'm not sure the gain using a halo, but I suspect it's probably pretty close to a dipole. Maybe a tad more, but it's not going to be a drastic difference. A loop has some gain broadside vs a dipole, but I'm not sure what you get running one on it's side. Thanks much. I'll have a look at that link and see what's what. The Yagi would be nice, but running out on the balcony and moving it around all the time isn't practical. That's why I wanted something fairly omnidirectional, as much of "omni" as I can get, anyway. Since I remember what my communications instructor told us about loops (they radiate equally poorly in all directionsg), I figured this would be the most practical solution for what I want to do. A horizontal dipole in front of a screen or single reflector would have a "pattern" that is 100+ degrees wide. How far behind the driven element should the reflector be? A quarter wavelength? Stack a couple vertically, say a meter apart, and you squeeze the vertical beam width significantly, which is probably what you want. Hmmm...! :-) That might be interesting, too. Feed them 90º out of phase? What you *might* want to do is look for a low gain TV antenna for the upper VHF bands (e.g. Channel 7-13): one of those two bay things with a bowtie in front of a screen. Think I'd need some kind of a balun to get the impedences to match? -- -- 73 DE Tom Rutherford, N8EUJ, Burton, MI "She said it was either her or the ham radio. Over." |
Horizontal Loop for 2m SSB
On 5/10/2011 11:42 AM, Tom Rutherford wrote:
"Jim wrote in message ... On 5/8/2011 10:22 AM, Tom Rutherford wrote: wrote in message ... http://search.yahoo.com/search;_ylt=...20meter%20halo Myself I'd probably stick a small 3 el yagi on that lamp mast if you had room.. Good bit more punch for SSB, and being things are reciprocal, it will improve reception. If you squeeze an extra 6 db from the antenna system, that's like taking 50 watts and turning it to 200. Best deal on an "amp" you will find.. :) I'm not sure the gain using a halo, but I suspect it's probably pretty close to a dipole. Maybe a tad more, but it's not going to be a drastic difference. A loop has some gain broadside vs a dipole, but I'm not sure what you get running one on it's side. Thanks much. I'll have a look at that link and see what's what. The Yagi would be nice, but running out on the balcony and moving it around all the time isn't practical. That's why I wanted something fairly omnidirectional, as much of "omni" as I can get, anyway. Since I remember what my communications instructor told us about loops (they radiate equally poorly in all directionsg), I figured this would be the most practical solution for what I want to do. A horizontal dipole in front of a screen or single reflector would have a "pattern" that is 100+ degrees wide. How far behind the driven element should the reflector be? A quarter wavelength? You got it. Stack a couple vertically, say a meter apart, and you squeeze the vertical beam width significantly, which is probably what you want. Hmmm...! :-) That might be interesting, too. Feed them 90º out of phase? Feed them in phase. What you *might* want to do is look for a low gain TV antenna for the upper VHF bands (e.g. Channel 7-13): one of those two bay things with a bowtie in front of a screen. Think I'd need some kind of a balun to get the impedences to match? Maybe.. depends on the antenna. But consider that they might actually have a 75 ohm impedance, which will be close to what you need. |
Horizontal Loop for 2m SSB
"Jim Lux" wrote in message ... On 5/10/2011 11:42 AM, Tom Rutherford wrote: "Jim wrote in message ... On 5/8/2011 10:22 AM, Tom Rutherford wrote: wrote in message ... http://search.yahoo.com/search;_ylt=...20meter%20halo Myself I'd probably stick a small 3 el yagi on that lamp mast if you had room.. Good bit more punch for SSB, and being things are reciprocal, it will improve reception. If you squeeze an extra 6 db from the antenna system, that's like taking 50 watts and turning it to 200. Best deal on an "amp" you will find.. :) I'm not sure the gain using a halo, but I suspect it's probably pretty close to a dipole. Maybe a tad more, but it's not going to be a drastic difference. A loop has some gain broadside vs a dipole, but I'm not sure what you get running one on it's side. Thanks much. I'll have a look at that link and see what's what. The Yagi would be nice, but running out on the balcony and moving it around all the time isn't practical. That's why I wanted something fairly omnidirectional, as much of "omni" as I can get, anyway. Since I remember what my communications instructor told us about loops (they radiate equally poorly in all directionsg), I figured this would be the most practical solution for what I want to do. A horizontal dipole in front of a screen or single reflector would have a "pattern" that is 100+ degrees wide. How far behind the driven element should the reflector be? A quarter wavelength? You got it. Peachy. Nice, short boom. Stack a couple vertically, say a meter apart, and you squeeze the vertical beam width significantly, which is probably what you want. Hmmm...! :-) That might be interesting, too. Feed them 90º out of phase? Feed them in phase. Ah! Okay. What you *might* want to do is look for a low gain TV antenna for the upper VHF bands (e.g. Channel 7-13): one of those two bay things with a bowtie in front of a screen. Think I'd need some kind of a balun to get the impedences to match? Maybe.. depends on the antenna. But consider that they might actually have a 75 ohm impedance, which will be close to what you need. I should probably invest in an antenna matcher. Think I've got one for 11m, but that wouldn't do me much good. :-) -- -- 73 DE Tom Rutherford, N8EUJ, Burton, MI "She said it was either her or the ham radio. Over." |
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