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Post by Night Ranger on Feb 21, 2012 9:20:41 GMT -5
Check this guy's home made antenna out. I have talked to him at least twice on 38 LSB in the mornings. He already had a nice signal with a single home made 7 element yagi, but now he has two of them stacked! 1sd227.blogspot.com/Night Ranger |
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Post by cbrown on Feb 21, 2012 10:04:48 GMT -5
Very nice, and it seems to work very well too.
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Sandbagger
Administrator/The Boss 
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Post by Sandbagger on Feb 21, 2012 11:38:05 GMT -5
Check this guy's home made antenna out. I have talked to him at least twice on 38 LSB in the mornings. He already had a nice signal with a single home made 7 element yagi, but now he is has two of them stacked! 1sd227.blogspot.com/Night Ranger Well now, looks like you have a summer project to do. Summer E-skip is only a couple of months away, and you'll want to be loud and proud up here in Pa right?  |
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Post by Night Ranger on Feb 21, 2012 15:23:40 GMT -5
Check this guy's home made antenna out. I have talked to him at least twice on 38 LSB in the mornings. He already had a nice signal with a single home made 7 element yagi, but now he is has two of them stacked! 1sd227.blogspot.com/Night Ranger Well now, looks like you have a summer project to do. Summer E-skip is only a couple of months away, and you'll want to be loud and proud up here in Pa right? I'm looking at building a six element broadside array for the west coast with .6 wavelength elements and .6 wavelength spacing between the top and bottom elements. The screen reflector for my current Lazy H facing P.A. has hit a snag. The supporting trees for the Lazy H branch out as they go up. That makes it harder to build the top part of the Lazy H screen reflector. I have not decided the best course of action yet for the C.R.R, but I would like to come in there next Spring and Summer with some needle bending R.F. Especially if one of your local jammers decides he wants a rematch with me after I sent him scurrying below channel 1 last summer : ) The picture below shows the approximate gain of the 6 element array over a classic centerfed Lazy H. Actual gain may be slightly higher as I don't have enough "segments" available for the freeware version of EZNec to accurately model the antenna. The take off angle is better for the 6 element array compared to the Lazy H. The Lazy H take off angle is 17 degrees at 1 wavelength at the top wire, and the 6 element array has a take off angle of 11 degrees with the top wire at 1.7 wavelength. 6 element array www.shadowstorm.com/images/6ElementArray.jpgNight Ranger |
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Sandbagger
Administrator/The Boss
Posts: 6,250
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Post by Sandbagger on Feb 21, 2012 17:33:25 GMT -5
Well now, looks like you have a summer project to do. Summer E-skip is only a couple of months away, and you'll want to be loud and proud up here in Pa right? I'm looking at building a six element broadside array for the west coast with .6 wavelength elements and .6 wavelength spacing between the top and bottom elements. The screen reflector for my current Lazy H facing P.A. has hit a snag. The supporting trees for the Lazy H branch out as they go up. That makes it harder to build the top part of the Lazy H screen reflector. I have not decided the best course of action yet for the C.R.R, but I would like to come in there next Spring and Summer with some needle bending R.F. Especially if one of your local jammers decides he wants a rematch with me after I sent him scurrying below channel 1 last summer : ) The picture below shows the approximate gain of the 6 element array over a classic centerfed Lazy H. Actual gain may be slightly higher as I don't have enough "segments" available for the freeware version of EZNec to accurately model the antenna. The take off angle is better for the 6 element array compared to the Lazy H. The Lazy H take off angle is 17 degrees at 1 wavelength at the top wire, and the 6 element array has a take off angle of 11 degrees with the top wire at 1.7 wavelength. 6 element array www.shadowstorm.com/images/6ElementArray.jpgNight Ranger Well, that Lazy-H homebrew worked exceptionally well last summer, so hopefully any "improvements" that you make to it, truly are. From our own experiences up this way (and Pete can back me up on this) sometimes antennas do not work the same as you've planned. Sometimes they work way better, sometimes not as good. It leaves you scratching your head, and you end up chalking it up to variables that you can't predict (like rolling hills and ground conductivity). Of course that's half the fun, trying to figure out the mysteries of RF....  |
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Post by spitfire441 on Feb 21, 2012 18:29:16 GMT -5
I'm looking at building a six element broadside array for the west coast with .6 wavelength elements and .6 wavelength spacing between the top and bottom elements. The screen reflector for my current Lazy H facing P.A. has hit a snag. The supporting trees for the Lazy H branch out as they go up. That makes it harder to build the top part of the Lazy H screen reflector. I have not decided the best course of action yet for the C.R.R, but I would like to come in there next Spring and Summer with some needle bending R.F. Especially if one of your local jammers decides he wants a rematch with me after I sent him scurrying below channel 1 last summer : ) The picture below shows the approximate gain of the 6 element array over a classic centerfed Lazy H. Actual gain may be slightly higher as I don't have enough "segments" available for the freeware version of EZNec to accurately model the antenna. The take off angle is better for the 6 element array compared to the Lazy H. The Lazy H take off angle is 17 degrees at 1 wavelength at the top wire, and the 6 element array has a take off angle of 11 degrees with the top wire at 1.7 wavelength. 6 element array www.shadowstorm.com/images/6ElementArray.jpgNight Ranger Well, that Lazy-H homebrew worked exceptionally well last summer, so hopefully any "improvements" that you make to it, truly are. From our own experiences up this way (and Pete can back me up on this) sometimes antennas do not work the same as you've planned. Sometimes they work way better, sometimes not as good. It leaves you scratching your head, and you end up chalking it up to variables that you can't predict (like rolling hills and ground conductivity). Of course that's half the fun, trying to figure out the mysteries of RF.... Yea, go figure. As an example. I moved my 20 meter full wave single element quad from on place on the property to another, higher on my hill and re-orintated to be bi-directional east-west on 20m. Now here is the fun part,It is my strongest signal antenna to Sandbagger now on 11m, beats my horizontal 3 element yagi, 260' doublet @ 80', Co-Phased Imax 2000 array, all beat by a 20m single element quad @ 40' at the top plane of the square. The thing is 2 full waves on 11m, but only 'Bagger has a bigger signal, all the other locals are equal or less to the Imax's. As an added bonus the quad smokes on 20,11 and 10 meters. As warmer wx approches I plan a lazy H for the woods here....stay tuned.  |
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Post by mrclean63 on Feb 24, 2012 22:21:21 GMT -5
I talked to the same guy eariler this year. Put a nice signal into indiana for sure,
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Post by Night Ranger on Mar 6, 2012 21:27:37 GMT -5
My new antenna for talking out west is becoming a reality. I have it about 80% built. I just have to put the support and element spacing ropes on it, solder on the ladder line going back to the shack, and then hoist it up in the air. Of course that does not include any unexpected trouble shooting that comes along once it is up in the air. I'll post a new thread in the antenna section with pictures and video once is it operational. : ) Night Ranger |
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Post by ab3nk on May 27, 2012 9:50:43 GMT -5
Check this guy's home made antenna out. I have talked to him at least twice on 38 LSB in the mornings. He already had a nice signal with a single home made 7 element yagi, but now he has two of them stacked! 1sd227.blogspot.com/Night Ranger Stacking only net's you 2.85 Db of improvement, while making the apature ( Beam Width ) smaller. The Super Duo 10 Beam SDB 10 did the same thing, and being Horizontal Polarized, wouldn't do him much good as opposed to the Super Duo 10 which was vertically polarized. Phasing lines loss, would negates some of the gain you acheive by adding the second beam antenna, and phasing lines are a pain to get to work right. The trick is not in how many elements you add, but in how large the diameter of each element is. If you could get each element to be about 3 inches in diameter, that one 5 / 6 or 7 element beam antenna would be very broadbanded and might only fluctuate .3 of one Db in resonance the whole way from Channel 1 to channel 40 and beyond. Most people who makes their own antenna's, tends to use the lightest materials available - since they tend to be the cheapest and the easiest to work with. Also - a 2o meter beam with 4 elements would probably do the same thing as his beam with 7 elements. 10 meters is just a division of 20 - so it really wouldn't matter much to the transceiver which one you used, especially if you used a transmatch. |
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Post by Night Ranger on May 27, 2012 14:48:09 GMT -5
Check this guy's home made antenna out. I have talked to him at least twice on 38 LSB in the mornings. He already had a nice signal with a single home made 7 element yagi, but now he has two of them stacked! 1sd227.blogspot.com/Night Ranger Stacking only net's you 2.85 Db of improvement, while making the apature ( Beam Width ) smaller. The Super Duo 10 Beam SDB 10 did the same thing, and being Horizontal Polarized, wouldn't do him much good as opposed to the Super Duo 10 which was vertically polarized. Phasing lines loss, would negates some of the gain you acheive by adding the second beam antenna, and phasing lines are a pain to get to work right. The trick is not in how many elements you add, but in how large the diameter of each element is. If you could get each element to be about 3 inches in diameter, that one 5 / 6 or 7 element beam antenna would be very broadbanded and might only fluctuate .3 of one Db in resonance the whole way from Channel 1 to channel 40 and beyond. Most people who makes their own antenna's, tends to use the lightest materials available - since they tend to be the cheapest and the easiest to work with. Also - a 2o meter beam with 4 elements would probably do the same thing as his beam with 7 elements. 10 meters is just a division of 20 - so it really wouldn't matter much to the transceiver which one you used, especially if you used a transmatch. Vertical stacking lowers the angle of radiation of the antenna. The gain increase you mention does not take in to account the best angle of radiation required to reach the desired target. If the maximum antenna gain is occurring at 16 degrees above the horizon with a single yagi and 11 degrees above the horizon with stacked yagi's then the gain increase at 11 degrees above the horizon is greater than 2.85 DB for the stacked yagis. Antenna modeling with EZNEC will prove my point. Shortwave broadcast stations stack dipole arrays to achieve not only maximum gain, but maximum gain at the desired take off angle. The desired take off angle in the case of the station in Italy is designed for greater than 2000 miles. That means a take off angle of 11 degrees above the horizon or less. Vertical stacking also suppresses high angle lobes, and that means less atmospheric noise from directly above the antenna. I have talked to that station on several occasions (like yesterday and today), and he consistently has one of the strongest stations coming out of Europe on 27 MHz. Night Ranger |
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