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1. [Towertalk] pine tree verticals (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Tue, 21 May 2002 20:33:28 -0700; All, I too live in the PNW, an area with tall Douglas Fir trees. I am blessed relatively large area in which to experiment: a grove of fir trees, a treed area adjacent to a series of single family ho; /archives//html/Towertalk/2002-05/msg00598.html (9,212 bytes)
2. [Towertalk] antennas near water (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Sat, 20 Apr 2002 17:14:18 -0700; Bill and the rest, A lot can be said about antenna performance in a fresh water environment. It seems to me that the distinguishing impact of a fresh water environment on antenna performance involves; /archives//html/Towertalk/2002-04/msg00829.html (10,518 bytes)
3. [Towertalk] SOLDER TO ALUMINUM (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Mon, 22 Apr 2002 11:22:51 -0700; All, Can anyone recommend a method to solder aluminum to aluminum and = copper to aluminum? Am experimenting with a new antenna. Once I successfully soldered brass mesh over a vent hole in an = alumi; /archives//html/Towertalk/2002-04/msg00904.html (7,345 bytes)
4. [Towertalk] HyGain Balun (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Wed, 24 Apr 2002 20:55:59 -0700; Tower talkers, Have been following this thread with interest. The original question of whether to reinstall the HyGain BN-86 voltage balun or to replace or even supplement that balun with a current b; /archives//html/Towertalk/2002-04/msg01003.html (11,567 bytes)
5. [Towertalk] HyGain Balun (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Wed, 24 Apr 2002 21:02:46 -0700; Tower talkers, Have been following this thread with interest. The original question of whether to reinstall the HyGain BN-86 voltage balun or to replace or even supplement that balun with a current b; /archives//html/Towertalk/2002-04/msg01004.html (13,345 bytes)
6. [Towertalk] Force 12 Sigma verticals (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Mon, 18 Mar 2002 11:42:53 -0800; Bob, I have not actually constructed my array just yet. Have been using a single Sigma 80 on 80 CW for this past season and have compared it's performance to known antennas at this QTH. 1) The "stand; /archives//html/Towertalk/2002-03/msg00402.html (9,426 bytes)
7. [Towertalk] Force 12 Sigma verticals (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Mon, 25 Mar 2002 17:49:46 -0800; Danny, Your question is one that is frequently asked on this Reflector. Since no one else has responded to your posting, I'd like to offer my understanding. You ask "is there some way to enhance the; /archives//html/Towertalk/2002-03/msg00642.html (16,023 bytes)
8. [Towertalk] The Ladder Line Twist (No Dancing Required) (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Sun, 31 Mar 2002 15:58:21 -0800; All, I had actually thought that one reason for the twists in VHF / UHF twin lead was an effort to minimize coupling of the feedline to the masts and other nearby objects so as to reduce minor balanc; /archives//html/Towertalk/2002-03/msg00814.html (6,914 bytes)
9. [TowerTalk] W2DU Balun's? (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Sun, 3 Feb 2002 14:39:27 -0800; Rich, There are a number of good commercial options. The ones that I would recommend are the Cal-Av Labs series of "choke" or "current" ferrite bead baluns: http://www.cal-av.com/ These baluns appear; /archives//html/Towertalk/2002-02/msg00098.html (10,407 bytes)
10. [TowerTalk] Too much antenna? (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Sun, 17 Feb 2002 09:08:01 -0800; Don, Congratulations on your antenna performance. Quite satisfying, isn't it? I once had similar problems with RF in the shack. It is possible that your feedline(s) and rotator cable and control cabl; /archives//html/Towertalk/2002-02/msg00531.html (12,410 bytes)
11. [TowerTalk] Force 12 Sigma 80 (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Mon, 21 Jan 2002 16:34:26 -0800; Brad and the group, Read with interest the postings on the Sigma 80 vertical and the related discussions about home made verticals, wires in trees, etc. There are at least two different issues to con; /archives//html/Towertalk/2002-01/msg00466.html (15,410 bytes)
12. [TowerTalk] New book announcements (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Mon, 13 Aug 2001 12:45:15 -0700; Ford and all, I agree with you. Overall, AntennaX offers low level information and a fair amount of misinformation with notable exceptions. It is stupid to assert that a wide circulation is a measure; /archives//html/Towertalk/2001-08/msg00305.html (10,748 bytes)
13. [TowerTalk] RFI suppression (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Thu, 22 Mar 2001 05:35:06 -0800; Eric, It sounds like you have been given some very sound advise about your RFI problems. Your theory about the common mode RF on your feedline is the same theory that is behind the proposed solutions; /archives//html/Towertalk/2001-03/msg00441.html (8,287 bytes)
14. [TowerTalk] HyGain 40 meter 2 element Discover 7-2 (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Sun, 25 Feb 2001 19:56:46 -0800; Paul, I do have comments on the value of a 40 meter yagi on a 60' tower. I have conducted systematic survey of all DX stations that I work from my home station regarding their equipment and antenna i; /archives//html/Towertalk/2001-02/msg00469.html (8,027 bytes)
15. [TowerTalk] RF Baluns (commercial or homemade?) (score: 1): Author: petrich@u.washington.edu (John Petrich); Date: Sat, 20 Jan 2001 16:20:19 -0800; Sylvan, Aside from the personal satisfaction that you may experience from building your own balun, you are more likely to do worse, making your own balun, instead of purchasing one of these quality p; /archives//html/Towertalk/2001-01/msg00549.html (8,410 bytes)

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