ON4UN's Low Band DXing book is on sale for $20 right now. Get that and you’ll know as much as anybody about radials.
https://www.arrl.org/shop/ON4UN-s-Low-Band-DXing <https://www.arrl.org/shop/ON4UN-s-Low-Band-DXing> wunder K6WRU Walter Underwood CM87wj http://observer.wunderwood.org/ (my blog) > On Aug 25, 2020, at 8:14 PM, David Gilbert <[email protected]> wrote: > > > If you are going to go with buried radials, I don't think 4 or 5 of them is > going to do a very good job for you. > > Like N7WS recommended, look up N6LF's work and read it carefully. Seriously. > > 73, > Dave AB7E > > > > > On 8/25/2020 5:31 PM, kevinr wrote: >> I have to be very careful of raised wires on my property. If they are not >> above the height of an elk's antlers I am in trouble. I plan to bury them. >> This is something I've never done before which has its own merit. I have >> plenty of wire scrap from broken antennas so the non-resonant, buried >> radials work better for my circumstances. I need to calculate the feed >> point impedance to see if I need to design a balun for the system to work. >> Once my main project is done I'll have more time for modeling each method. >> >> Thanks for all the ideas guys, >> >> 73, Kevin. KD5ONS >> >> >> On 8/25/20 5:23 PM, Wes wrote: >>> You probably should get acquainted with Rudy Severns, N6LF. >>> (https://www.antennasbyn6lf.com/) He has written more than you ever want >>> to know about vertical antennas, >>> >>> More specifically to your case, are you planning the radials to be >>> elevated? If so, they need to be the same length, in fact some effort >>> should be made to get all of the currents the same. The last thing you want >>> is a fifty ohm feedpoint impedance with a shortened vertical (which is what >>> an L is). There is evidence that elevated radials are an improvement over >>> on-the-ground or buried radials. Mine are on the ground, mainly because 1) >>> I didn't want to give up radiator height to raise the radials, 2) all of >>> the big guns bury theirs and I don't have room for full length radials >>> anyway in my cactus patch. See my QRZ page for evidence. >>> >>> My modeling shows a little bit of directivity away from the horizontal >>> wire, but it's negligible. >>> >>> Wes N7WS >>> >>> On 8/25/2020 4:23 PM, kevinr wrote: >>>> From what I can find, and what I can calculate, five wires, each ~130 feet >>>> long, could make a nice inverted L for 160 meters. One leg for the >>>> vertical and horizontal portion of the antenna. Four legs for the >>>> counterpoise (ground plane). There are many broken wire antennas stored >>>> in my shed which are fodder for the radials. Do all of the legs for the >>>> counterpoise need to be 1/4 wavelength or can I substitute some shorter >>>> lengths? The feedpoint should somewhere above 50 ohms impedance. As I >>>> add more radials that number will reach 50 ohms asymptotically. >>>> >>>> I can get the vertical part up to 70 or 80 feet above ground with the rest >>>> of it horizontal. Most of the radiation should take place from the >>>> vertical part since it is closer to the feed point. But there should be >>>> some effect from the direction of the horizontal portion. How strongly >>>> does the direction of the horizontal portion effect the radiation pattern >>>> of the antenna system? My property allows me to point it from 300 degrees >>>> around to 200 degrees so I have plenty of options. Between 200 and 300 >>>> degrees there is a road used by loggers, and the folks maintaining the >>>> towers at the top of this mountain. They can break any antenna lower than >>>> 80 feet above ground. Spar poles and cranes clear out any dead limbs >>>> across the road. >>>> >>>> Inquiring minds... >>>> >>>> Kevin. KD5ONS >>>> >>>> ______________________________________________________________ >>>> Elecraft mailing list >>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>> Help: http://mailman.qth.net/mmfaq.htm >>>> Post: mailto:[email protected] >>>> >>>> This list hosted by: http://www.qsl.net >>>> Please help support this email list: http://www.qsl.net/donate.html >>>> Message delivered to [email protected] >>> >>> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [email protected] >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
