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Total 14 documents matching your query.

1. Topband: shunt feed help needed (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Sun, 07 Oct 2001 14:54:29 -0400; I'm hoping someone can help me understand what I'm seeing. Setup is a Rohn 25 tower with 3 yagis -- a short 40 at 105 ft, a C-3E at 97 ft and another C-3E at 69 feet. I tapped the tower at about 30 f; /archives//html/Topband/2001-10/msg00036.html (8,383 bytes)
2. Topband: shunt feed help needed (score: 1): Author: k6se@juno.com (k6se@juno.com); Date: Sun, 7 Oct 2001 16:02:41 -0700; "I'm hoping someone can help me understand what I'm seeing. Setup is a Rohn 25 tower with 3 yagis -- a short 40 at 105 ft, a C-3E at 97 ft and another C-3E at 69 feet. I tapped the tower at about 30; /archives//html/Topband/2001-10/msg00040.html (10,019 bytes)
3. Topband: shunt feed help needed (score: 1): Author: donhall@myriad.net (Don Hall); Date: Sun, 7 Oct 2001 19:30:25 -0500; Pete, I put my 160 wire at the top of my LM354 spaced out about 12-18 inches and it matches close enough so don't need anything but a series capacitor. The drop wire is a piece of RG62 used as a larg; /archives//html/Topband/2001-10/msg00041.html (7,742 bytes)
4. Topband: shunt feed help needed (score: 1): Author: herbs@vitelcom.net (Herbert Schoenbohm); Date: Mon, 08 Oct 2001 02:15:23 +0100; Pete, The ratio of the #14 wire to the size of the tower, as well as the lower C3E (even though the elements are insulated may be adding to your problem. My suggestion is to use a larger diameter shu; /archives//html/Topband/2001-10/msg00043.html (9,696 bytes)
5. Topband: shunt feed help needed (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Mon, 8 Oct 2001 13:27:30 +0200; be The point where to attach the gamma rod, the distance from tower and the ratio between the tower and the rod itself play all a significant role. What finally should be a convenient 50 +JX is the; /archives//html/Topband/2001-10/msg00048.html (8,994 bytes)
6. Topband: shunt feed help needed (score: 1): Author: k8mn@earthlink.net (Dave Heil); Date: Mon, 08 Oct 2001 13:33:13 +0000; There seems to be much reinvention of the wheel going on in this discussion :) Pete--If you want to use the gamma match, you can change the point at which the tower is tapped and/or change the spacin; /archives//html/Topband/2001-10/msg00049.html (10,613 bytes)
7. Topband: shunt feed help needed (score: 1): Author: k6se@juno.com (k6se@juno.com); Date: Mon, 8 Oct 2001 08:41:01 -0700; Mauri, I4JMY implied that if the vertical was 1/4-wave resonant that it could not be shunt-fed. There is no problem shunt-feeding a 1/4-wave vertical in the normal fashion. In fact, a 1/4-wave vertic; /archives//html/Topband/2001-10/msg00050.html (9,643 bytes)
8. Topband: shunt feed help needed (score: 1): Author: w8ik@subich.com (Joe Subich, K4IK); Date: Mon, 8 Oct 2001 12:34:53 -0400; Inductive reactance when shunt feeding a tower is a major "red flag!" As Earl correctly states, it means the tower is greater than 180 degrees electrically. Tall towers have a significant high angle; /archives//html/Topband/2001-10/msg00051.html (9,192 bytes)
9. Topband: shunt feed help needed (score: 1): Author: marc.wullaert3@pandora.be (Marc Wullaert); Date: Mon, 08 Oct 2001 18:18:10 +0100; Pete , put the taparound 60feet.See what happening.Now I have the 40cd on top off the tower (28m)At 25m I have a kt34xa. I started the tap at 9m and did get no resonance.I moved the tap at 18m and th; /archives//html/Topband/2001-10/msg00053.html (8,518 bytes)
10. Topband: shunt feed help needed (score: 1): Author: gabnjb@earthlink.net (Gary Breed); Date: Mon, 8 Oct 2001 16:39:33 -0400; Fellow topbanders, After seeing the discussions of shunt feeding, a reminder is in order about measurements and matching networks! There is no need to find that "magical" attachment point for an exac; /archives//html/Topband/2001-10/msg00054.html (9,255 bytes)
11. Topband: shunt feed help needed (score: 1): Author: k6se@juno.com (k6se@juno.com); Date: Mon, 8 Oct 2001 18:18:44 -0700; "One easy way is to use two wires spaced the width of the tower face. On a typical 60-80 foot tower with beams, go all the way to the top." == Coincidentally, yesterday I modeled SM4CAN's shunt-fed t; /archives//html/Topband/2001-10/msg00056.html (9,639 bytes)
12. Topband: shunt feed help needed (score: 1): Author: k6se@juno.com (k6se@juno.com); Date: Mon, 8 Oct 2001 19:05:09 -0700; "Inductive reactance when shunt feeding a tower is a major "red flag!" == I'm sure Joe meant capacitive reactance rather than inductive reactance. 73, de Earl, K6SE; /archives//html/Topband/2001-10/msg00057.html (7,934 bytes)
13. Fw: Topband: shunt feed help needed (score: 1): Author: Jay E Ostrem" <wc7m@vcn.com (Jay E Ostrem); Date: Tue, 9 Oct 2001 05:35:03 -0000; often A I agree with Gary, I only want to climb it once! I've used the "cheating method" almost exclusively. There are two caveats though. 1. I believe the Q of the L network is related to the ratio'; /archives//html/Topband/2001-10/msg00059.html (9,495 bytes)
14. Topband: shunt feed help needed (score: 1): Author: gmguerin@voyager.net (George & Marijke Guerin); Date: Fri, 12 Oct 2001 01:07:26 -0400; Gentlemen: With normal "fat wire or tubing" the inductance of the gamma rod or wire is just under one microhenry per meter of length. So, if you get a spot where the feed point has 50 + 0j ohms at th; /archives//html/Topband/2001-10/msg00089.html (8,751 bytes)

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