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Total 20 documents matching your query.

1. [Towertalk] Shunt Feed Tower (score: 1): Author: jim@kc4hw.net (Jim Johnson - KC4HW); Date: Tue, 22 Oct 2002 21:31:11 -0400; Hello Everyone, Need a little help with shunt feeding a 80 trylon self supporting tower. On this tower there is a 4 elements for 20m on 36' boom with 4 elements interlaced for 15m. At 87' is 5 elemen; /archives//html/Towertalk/2002-10/msg00720.html (8,082 bytes)
2. [Towertalk] Shunt Feed Tower (score: 1): Author: n8de@thepoint.net (Don Havlicek); Date: Tue, 22 Oct 2002 21:45:05 -0500; Yes, Shorten the shunt wire [gamma] to about 45 feet. All that hardware on top of the tower makes the tower look very long to the feedline! Not exactly sure what capacitance will tune it at that gamm; /archives//html/Towertalk/2002-10/msg00721.html (9,405 bytes)
3. [Towertalk] Shunt Feed Tower (score: 1): Author: n4kg@juno.com (n4kg@juno.com); Date: Tue, 22 Oct 2002 22:44:33 -0600; I *assume* you mean an 80 FOOT trylon self supporting tower. You neglected to indicate on what FREQUENCY you are trying to match the tower. It should make a GREAT shunt vertical for 160M where the to; /archives//html/Towertalk/2002-10/msg00722.html (9,836 bytes)
4. [Towertalk] Shunt Feed Tower (score: 1): Author: joe@xyz.net (WL7M); Date: Tue, 22 Oct 2002 20:19:06 -0800; And, you'll find that the resonant frequency will change by moving the wire closer to, or away from, the tower base. 73, Joe WL7M; /archives//html/Towertalk/2002-10/msg00723.html (10,630 bytes)
5. [Towertalk] Shunt Feed Tower (score: 1): Author: jim@kc4hw.net (Jim Johnson - KC4HW); Date: Wed, 23 Oct 2002 06:29:34 -0400; Sorry looking to match at 1845... Jim Johnson, KC4HW Melbourne, Florida http://www.kc4hw.net DXCluster RF Connection: 144.95 Telnet://kc4hw.homelinux.net:8000; /archives//html/Towertalk/2002-10/msg00725.html (10,632 bytes)
6. [Towertalk] Shunt Feed Tower (score: 1): Author: jim@kc4hw.net (Jim Johnson - KC4HW); Date: Wed, 23 Oct 2002 06:29:43 -0400; Sorry looking to match at 1845... Jim Johnson, KC4HW Melbourne, Florida http://www.kc4hw.net DXCluster RF Connection: 144.95 Telnet://kc4hw.homelinux.net:8000; /archives//html/Towertalk/2002-10/msg00726.html (10,628 bytes)
7. [Towertalk] Shunt Feed Tower (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 23 Oct 2002 07:18:19 -0400; Well, I dunno... I went through a long and painful process of trying to find a point on my similarly loaded tower that would give 50 ohms when fed with a shunt wire and a series capacitor. Never did.; /archives//html/Towertalk/2002-10/msg00727.html (8,537 bytes)
8. [Towertalk] Shunt Feed Tower (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Wed, 23 Oct 2002 07:30:09 -0400; Jim, if you have access to an instrument like an MFJ-259, read the resistive and reactive parts of the impedance at the base with no capacitor in circuit. Tap height affects Zo only and the C tunes o; /archives//html/Towertalk/2002-10/msg00729.html (8,495 bytes)
9. [Towertalk] Shunt Feed Tower (score: 1): Author: ccc@space.mit.edu (Chuck Counselman); Date: Wed, 23 Oct 2002 09:39:54 -0400; Where I live, you can't get a valid impedance measurement from such an instrument because its detector is broadband and detects too much power from AM broadcast stations. However, an antenna noise br; /archives//html/Towertalk/2002-10/msg00730.html (8,109 bytes)
10. [Towertalk] Shunt Feed Tower (score: 1): Author: n4zr@contesting.com (Pete Smith); Date: Wed, 23 Oct 2002 09:49:37 -0400; Hallelujah -- I KNEW there was some reason I kept my Palomar, aside from not being able top sell it to anyone! 73, Pete N4ZR Sometimes a tower is just a tower; /archives//html/Towertalk/2002-10/msg00731.html (8,244 bytes)
11. [Towertalk] Shunt Feed Tower (score: 1): Author: jim@kc4hw.net (Jim Johnson - KC4HW); Date: Wed, 23 Oct 2002 19:14:39 -0400; Want to thanks everyone for the help on the tower. We added the additional air variable as an Omega Match and is worked real good. We are planning to be on 160 during the CQWW SSB.. Thanks again for; /archives//html/Towertalk/2002-10/msg00737.html (7,996 bytes)
12. [Towertalk] Shunt Feed Tower (score: 1): Author: kb9cry@attbi.com (Phil - KB9CRY); Date: Wed, 23 Oct 2002 19:59:39 -0500; If I may point out another item. You mentioned that you're using air variables. Those will be OK as long as you limit your power to 100 watts or so. If you're going to use an amp, then you'll be pump; /archives//html/Towertalk/2002-10/msg00738.html (9,320 bytes)
13. [Towertalk] Shunt Feed Tower (score: 1): Author: n4kg@juno.com (n4kg@juno.com); Date: Wed, 23 Oct 2002 22:55:03 -0600; The voltage across the capacitor will depend on how much capacitance is needed to tune the antenna and the power applied. Plate SPACING will also be a factor in breakdown voltage. I had NO problem wi; /archives//html/Towertalk/2002-10/msg00748.html (10,685 bytes)
14. [TowerTalk] Shunt feed Tower (score: 1): Author: ac7nj@yahoo.com (Randy); Date: Thu, 17 Jan 2002 05:51:02 -0800; I'm planning to put up my tower this spring so I'm working on some of the details. I hope to shunt feed the tower for 80 and 160M. 1) I have a small city lot so my question is for the radials, I don'; /archives//html/Towertalk/2002-01/msg00391.html (7,622 bytes)
15. [TowerTalk] Shunt feed Tower (score: 1): Author: n8de@thepoint.net (Don Havlicek); Date: Thu, 17 Jan 2002 10:12:41 -0500; My reply inserted below: Sounds like a good way for you to work those bands using your tower. You DO have room for radials, though they might now be 'radially placed' .. just put them down wherever y; /archives//html/Towertalk/2002-01/msg00393.html (8,680 bytes)
16. [TowerTalk] Shunt feed Tower (score: 1): Author: dhearn@ix.netcom.com (dan hearn); Date: Thu, 17 Jan 2002 15:20:41 -0800; Hi Randy: Will the tower have a yagi on top? How tall is it? You do not have to insulate the tower base. You need something to connect the coax shield to at the base of the tower. If you can drive a; /archives//html/Towertalk/2002-01/msg00394.html (9,754 bytes)
17. [TowerTalk] Shunt feed Tower (score: 1): Author: cdietz@swbell.net (Logan Dietz); Date: Thu, 17 Jan 2002 10:11:07 -0600; You might try an inverted L antenna with the base at the roof level and with an elevated ground taking in the roof as part of the ground by running radials on the roof. You could also run radials ar; /archives//html/Towertalk/2002-01/msg00396.html (7,729 bytes)
18. [TowerTalk] Shunt Feed Tower (score: 1): Author: rthorne@mailbox.arn.net (Richard M. Thorne); Date: Wed, 08 Oct 1997 09:12:13 -0500; Has anybody had experience shunt feeding a 60' tower for two bands (160 and 80) at the same time. I'd like to use the tower for both bands since its already 15' off the ground on my office building.; /archives//html/Towertalk/1997-10/msg00227.html (7,245 bytes)
19. [TowerTalk] Shunt Feed Tower (score: 1): Author: k0wa@southwind.net (Lee Buller); Date: Wed, 08 Oct 1997 11:12:11 -0500; What I have done before (this idea is not new by any means) is to use a relay switching scheme to switch in and out the appropriate capacitors on the gamma match. On my tower, the length of the gamma; /archives//html/Towertalk/1997-10/msg00230.html (8,091 bytes)
20. [TowerTalk] Shunt Feed Tower (score: 1): Author: dietz@texas.net (C. Logan Dietz); Date: Wed, 08 Oct 1997 13:11:33 -0500; I have used two gammas before terminated to a box with two feed through insulators on top and relays inside along with matching caps Chuck, KZ5MM -- FAQ on WWW: http://www.contesting.com/towertalkfaq; /archives//html/Towertalk/1997-10/msg00234.html (8,043 bytes)

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