Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Thu, 17 Aug 2017 14:29:47 -0400
I've seen a few possibilities in the past, but I'd like to add a dew slopers to come up with the 5 used for some directivity, gain and front to back. Switched coils at the feedpoint with frequency se
Author: Rod Greene via TowerTalk <towertalk@contesting.com>
Date: Thu, 17 Aug 2017 19:20:12 +0000 (UTC)
Or use an auto tuner at the feedpoint to match the slopers on whatever band/freq you want to use. That's what I do. 73, Rod/w7zrc From: Roger (K8RI) on TT <K8RI-on-TowerTalk@tm.net> To: "towertalk@co
Rod's idea is by far the best. Slopers are weird creatures. While you can broadband antennas by making the elements with a large diameter (as in a cage) the mechanical complexity isn't worth it. If t
Except Roger is envisioning sloping *dipoles*, FIVE of them. Somehow I can't picture five tuners hanging out there in mid-air at the feedpoints, begging to be tuned up and down the band. Not to menti
If the tuner(s) are mounted on the tower. -Steve K8LX On 8/17/2017 7:53 PM, Steve Maki wrote: Except Roger is envisioning sloping *dipoles*, FIVE of them. Somehow I can't picture five tuners hanging
I have a 3 sloper array off the tower to the SE, SW, NW. They are half wave ? loaded sloping dipoles that are about 80 ft long with loading coils to get ½ wave performance on 80. I just switch in and
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Fri, 18 Aug 2017 03:56:17 -0400
I'd need 5 auto tuners and the configuration would require that the be close to in sync. These are center fed, half wave dipoles. I've had excellent results on 40 and 75. Unfortunately with the commo
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Fri, 18 Aug 2017 04:01:34 -0400
Mounted on the tower would put the tuners about 75 to80 feet from the feed points and although center fed they are a LONG way from being balanced, requiring 2 common mode chokes to keep RF out of the
On 8/17/17 4:53 PM, Steve Maki wrote: Except Roger is envisioning sloping *dipoles*, FIVE of them. Somehow I can't picture five tuners hanging out there in mid-air at the feedpoints, begging to be tu
That's the way I used to do it as well. I had alligator clip leads at the bottom end only on my sloping dipoles that jumpered around the bottom insulator for CW. Worked fine. -Steve K8LX On 8/17/2017
The ARRL Antenna Handbook has a number ways to broadband a dipole, several probably difficult as noted. One not in the current handbook is the Witt/Leeson tuned coaxial resonator feed method, see htt
Unless the tower is resonant on 80m slopers should work fine. I think only half slopers are "weird creatures" because the tower and attached beams radiate. John KK9A Rod's idea is by far the best. Sl
I misunderstood and assumed half-slopers. Autotuners wouldn't help much! Kim N5OP "People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith _________
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Fri, 18 Aug 2017 20:12:31 -0400
I had a half sloper on 160 that worked very well. It's about the same length as the half wave sloper on 75. Close enough that shorted out, the 75 could be end fed tuned on 160 as a half sloper. That'
The ARRL Antenna Handbook has a number ways to broadband a dipole, several probably difficult as noted. One not in the current handbook is the Witt/Leeson tuned coaxial resonator feed method, see htt
Garry, NI6T, turned me on to this several years ago, crediting it to W6NL. Dave, who teaches at Stanford, has long included it in his classes, but denied credit for it, saying that it was far older
Author: Bryan Swadener via TowerTalk <towertalk@contesting.com>
Date: Sat, 19 Aug 2017 18:25:41 +0000 (UTC)
I just built a 4 wire cage inverted vee, hanging from my tower, and feed it with about 85 feet of DXE400MAX cable. With the VSWR low point at about 3625 kHz, the worst-case VSWR is just under 2:1 at
Author: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Sat, 19 Aug 2017 15:08:46 -0400
Thanks for that link Grant. I think I'll try it. I have a couple of spools of RG8X-LL which will handle the legal limit if the SWR is low. I tune the amp into a dummy load, so I want an SWR limit of
Author: Dan Maguire via TowerTalk <towertalk@contesting.com>
Date: Sun, 20 Aug 2017 02:28:17 +0000 (UTC)
And Jim K9YC followed up with: This broadbanding technique came up a few years ago here on TowerTalk and was used as the basis for an AutoEZ modeling study. See the fourth bullet here http://ac6la.co
On 8/19/2017 7:28 PM, Dan Maguire via TowerTalk wrote: Grant KZ1W wrote: The ARRL Antenna Handbook has a number ways to broadband a dipole, several probably difficult as noted. One not in the current