I use elevated radials all the time. 2 sloping down at roughly 45 degrees at a 90 degree angle to each other. Noticeable improvement over other configurations like the magic carpet.
Will adding a second radial help to lower SWR. Also, would a second radial make the antenna even more directional. I have recently seen several videos using 2 raised radials and they claim it helps by increasing the dbi. Some videos are claiming 4 - 5 dbi increase. Curious to hear your thoughts. Thanks Terry
I don't think the second radial has any noticeable effect on swr. I think it has more to do with the angle of the slope of the radial. I put the feed point up at roughly 6ft (I use a camera tripod to mount the antenna) and slope the radials down to about waist height or a little lower. I routinely get swr of 1.2:1 or less.
@@KC3UVF I'm heading out Sunday to play POTA and I'm going to try a single rasied tuned radial with a chameleon 17" antenna. Thanks for the information.
I have simulated two radials at 90 degrees. The simulation shows a maximum gain of only 1.26 dbi (compared to 1.75 dbi for a single radial). The direction of the maximum gain was halfway between the two radials. The additional radial had almost no effect on the SWR. Thanks for your comment.
Thanks for the demonstration of the changes' effect and for the good explanation. 🙂 This is in fact the kind of information I am interested in as a newbie in the ham radio hobby. I cannot put up a suitable antenna at the apartment and therefore depend on using wire antennas when operating from top of nearby hills. So far, I am interested merely in 15/17/20m, and my question refers to these upper bands that allow for using a vertical dipole (half wave): If the gain that can be achieved by adding such elevated radials to an end fed is in the range of up to 2 dB, am I then correct that when using a conventional vertical half wave dipole I will anyway have a gain of 2.15 dBi and thus have a better gain than what can be achieved with an end fed with radials? 🤔 (Please note that I am referring to the bands that have half wave length dipoles of a "manageable" length. I understand that with >20m wave length it is a different story.) 73 de DL1HNR, Henner
You are correct, but that would be very difficult to do. To measure the far field you must be far from the antenna and able to take readings from high above ground. Thanks for your comment.
That's a neat and very interesting idea!
Thanks Jim!! Excellent video!!
Thanks for your nice comment.
I use elevated radials all the time. 2 sloping down at roughly 45 degrees at a 90 degree angle to each other. Noticeable improvement over other configurations like the magic carpet.
Thanks for your comment.
Will adding a second radial help to lower SWR. Also, would a second radial make the antenna even more directional. I have recently seen several videos using 2 raised radials and they claim it helps by increasing the dbi. Some videos are claiming 4 - 5 dbi increase. Curious to hear your thoughts. Thanks Terry
I don't think the second radial has any noticeable effect on swr. I think it has more to do with the angle of the slope of the radial. I put the feed point up at roughly 6ft (I use a camera tripod to mount the antenna) and slope the radials down to about waist height or a little lower. I routinely get swr of 1.2:1 or less.
@@KC3UVF I'm heading out Sunday to play POTA and I'm going to try a single rasied tuned radial with a chameleon 17" antenna. Thanks for the information.
I have simulated two radials at 90 degrees. The simulation shows a maximum gain of only 1.26 dbi (compared to 1.75 dbi for a single radial). The direction of the maximum gain was halfway between the two radials. The additional radial had almost no effect on the SWR. Thanks for your comment.
@@KC3UVF Thanks for your comment.
@@tlnelson7598 Have fun and make lots of contacts.
Thanks for the demonstration of the changes' effect and for the good explanation. 🙂
This is in fact the kind of information I am interested in as a newbie in the ham radio hobby. I cannot put up a suitable antenna at the apartment and therefore depend on using wire antennas when operating from top of nearby hills. So far, I am interested merely in 15/17/20m, and my question refers to these upper bands that allow for using a vertical dipole (half wave): If the gain that can be achieved by adding such elevated radials to an end fed is in the range of up to 2 dB, am I then correct that when using a conventional vertical half wave dipole I will anyway have a gain of 2.15 dBi and thus have a better gain than what can be achieved with an end fed with radials? 🤔
(Please note that I am referring to the bands that have half wave length dipoles of a "manageable" length. I understand that with >20m wave length it is a different story.)
73 de DL1HNR, Henner
最好用场强表 进行测试来验证一下真实性
You are correct, but that would be very difficult to do. To measure the far field you must be far from the antenna and able to take readings from high above ground. Thanks for your comment.