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1. Topband: Broadband Inverted L (score: 1): Author: Joe Galicic <galicic@comcast.net>; Date: Thu, 20 Nov 2014 16:11:34 +0000 (UTC); I moved my 160 inverted L to a tall tree in my backyard to get more vertical height. The vertical leg is now about 65 feet and the rest (65feet) is horizontal. I fed this one with about 125 feet of 7; /archives//html/Topband/2014-11/msg00079.html (7,525 bytes)
2. Re: Topband: Broadband Inverted L (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Thu, 20 Nov 2014 10:17:16 -0600; It sure IS broadbanded. Couple of questions: Can you describe this? I get a 1.1 SWR reading from 1.8 to 1.9 before it moves up to 1.3 and Where are you measuring the SWR? At the feedpoint or at the e; /archives//html/Topband/2014-11/msg00080.html (7,066 bytes)
3. Re: Topband: Broadband Inverted L (score: 1): Author: Joe Galicic <galicic@comcast.net>; Date: Thu, 20 Nov 2014 17:10:54 +0000 (UTC); Mike, The antenna feed point terminates at a four foot ground rod and then I am running a number 14 wire from that ground rod to my existing radial field. That run is about 40 feet. The radial field; /archives//html/Topband/2014-11/msg00081.html (9,162 bytes)
4. Re: Topband: Broadband Inverted L (score: 1): Author: Gene Smar <ersmar@verizon.net>; Date: Thu, 20 Nov 2014 11:25:34 -0600 (CST); Joe: Don't ask questions and just enjoy the antenna's performance. 73 de Gene Smar AD3F I moved my 160 inverted L to a tall tree in my backyard to get more vertical height. The vertical leg is now ab; /archives//html/Topband/2014-11/msg00082.html (8,247 bytes)
5. Re: Topband: Broadband Inverted L (score: 1): Author: "Lloyd Berg - N9LB" <lloydberg@charter.net>; Date: Thu, 20 Nov 2014 11:26:36 -0600; In my case, I started out with four radials, great wideband match ~100KHz When I had some more time and wire, I went to 8 radials, that cut the bandwidth in half, still a good match. Each chance I ha; /archives//html/Topband/2014-11/msg00084.html (10,463 bytes)
6. Re: Topband: Broadband Inverted L (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 20 Nov 2014 09:53:34 -0800; A low SWR is NOT an indicator of an antenna's performance. It only indicates a match to the transmission line. In this case, the low SWR suggests that the antenna is highly resistive. The radiation r; /archives//html/Topband/2014-11/msg00085.html (8,880 bytes)
7. Re: Topband: Broadband Inverted L (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 20 Nov 2014 13:10:47 -0500; Joe posted, I moved my 160 inverted L to a tall tree in my backyard to get more vertical height. The vertical leg is now about 65 feet and the rest (65feet) is horizontal. I fed this one with about 1; /archives//html/Topband/2014-11/msg00086.html (9,997 bytes)
8. Re: Topband: Broadband Inverted L (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Thu, 20 Nov 2014 12:23:32 -0600; Have you considered elevated radials? Four of them 10' high (or even two!) would be MUCH better than what you have right now. My 160m Inverted-L: http://www.w0btu.com/160_meters.html#inv-l_antenna 73; /archives//html/Topband/2014-11/msg00087.html (7,750 bytes)
9. Re: Topband: Broadband Inverted L (score: 1): Author: Joe Galicic <galicic@comcast.net>; Date: Thu, 20 Nov 2014 19:12:28 +0000 (UTC); Thanks everyone ! Interesting. I knew something was not quite right. I thought I could "tap" into the existing ground system but obviously that is not going to be the case. I could manage two elevate; /archives//html/Topband/2014-11/msg00088.html (9,521 bytes)
10. Re: Topband: Broadband Inverted L (score: 1): Author: Joe Galicic <galicic@comcast.net>; Date: Thu, 20 Nov 2014 19:16:27 +0000 (UTC); I suppose another question is this all worth it? Meaning, is the L with 65 foot vertical leg with proper ground going to greatly outperform the L with 35 foot vertical leg ? -- Original Message -- Th; /archives//html/Topband/2014-11/msg00089.html (10,226 bytes)
11. Re: Topband: Broadband Inverted L (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 20 Nov 2014 14:17:55 -0500; Ground systems cannot be evaluated or estimated by number of feet of wire, just like they cannot be evaluated by SWR or bandwidth, but I'm sure we all agree on this...... The single most important th; /archives//html/Topband/2014-11/msg00090.html (9,614 bytes)
12. Re: Topband: Broadband Inverted L (score: 1): Author: Joe Galicic <galicic@comcast.net>; Date: Thu, 20 Nov 2014 19:26:22 +0000 (UTC); Thanks Tom. I get the picture now. Time to go out and connect more radials directly to the feed point ground. I can also elevate two of them. -Joe -- Original Message -- Ground systems cannot be eval; /archives//html/Topband/2014-11/msg00091.html (9,788 bytes)
13. Re: Topband: Broadband Inverted L (score: 1): Author: DGB <ns9i2016@Bayland.net>; Date: Thu, 20 Nov 2014 13:30:58 -0600; Exactly what I thought ... any way to slope the leg of the L to get it at the junction of the redials? de ns9i The single most important thing Joe said was: <<<< The antenna feed point terminates at; /archives//html/Topband/2014-11/msg00092.html (9,811 bytes)
14. Re: Topband: Broadband Inverted L (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 20 Nov 2014 11:52:28 -0800; Yes, but there's another important concept that is being missed here. The function of a radial system is NOT to couple the antenna to the earth, it is to SHIELD the antenna from the earth. Rather, th; /archives//html/Topband/2014-11/msg00093.html (10,859 bytes)
15. Re: Topband: Broadband Inverted L (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Thu, 20 Nov 2014 12:14:01 -0800; A few years ago I put up a temporary 60 foot vertical over my 230 foot diameter ground screen. It was top loaded with 2 "umbrella" wires sloping down. The bandwidth was MUCH narrower than your 65 foo; /archives//html/Topband/2014-11/msg00094.html (9,769 bytes)
16. Re: Topband: Broadband Inverted L (score: 1): Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>; Date: Thu, 20 Nov 2014 16:44:45 -0500; Hi, Joe I didn't have time to write you earlier. It was obvious that you had a lot of ground loss in series with the radiation resistance of the inverted-L that was swamping the reactance variation o; /archives//html/Topband/2014-11/msg00095.html (10,892 bytes)
17. Re: Topband: Broadband Inverted L (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 20 Nov 2014 17:52:34 -0500; A few years ago I put up a temporary 60 foot vertical over my 230 foot diameter ground screen. It was top loaded with 2 "umbrella" wires sloping down. The bandwidth was MUCH narrower than your 65 foo; /archives//html/Topband/2014-11/msg00096.html (10,456 bytes)
18. Re: Topband: Broadband Inverted L (score: 1): Author: Herbert Schoenbohm <herbs@vitelcom.net>; Date: Thu, 20 Nov 2014 20:45:46 -0400; And in some cases where the bandwidth is clearly excessive from normal the closer you are may be closer to a dummy load at the end of the feedline...if you care to look at it that way. Herb Schoenboh; /archives//html/Topband/2014-11/msg00097.html (10,838 bytes)
19. Re: Topband: Broadband Inverted L (score: 1): Author: "Charlie Cunningham" <charlie-cunningham@nc.rr.com>; Date: Sun, 23 Nov 2014 14:28:11 -0500; To elaborate a bit on Tom's point -14 ga wire would have approximately 0.4 uH/ft of inductance, so 40 feet of 14 ga wire would be around 16 uH with an inductive reactance at 1.8 MHz of around j180 oh; /archives//html/Topband/2014-11/msg00115.html (10,272 bytes)
20. Topband: Broadband Inverted L (score: 1): Author: "Richard Fry" <rfry@adams.net>; Date: Mon, 24 Nov 2014 08:05:01 -0600; Joe N3HEE wrote: I moved my 160 inverted L to a tall tree in my backyard to get more vertical height. The vertical leg is now about 65 feet and the rest (65feet) is horizontal. .... Any feedback woul; /archives//html/Topband/2014-11/msg00116.html (10,473 bytes)

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