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1. [TowerTalk] ARRL BPL Video (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Wed Aug 6 22:21:23 2003; The interference from BPL is so bad you owe it to yourself to see (and hear) this video!!! Please visit this site and comment to the FCC before the window closes August 20. http://www.arrl.org/news/s; /archives//html/Towertalk/2003-08/msg00207.html (6,504 bytes)
2. [TowerTalk] Re: [ct-user] Antenna Stacking Question (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Wed Jul 16 14:20:05 2003; <http://lists.contesting.com/mailman/listinfo/towertalk>k2qmf at juno.com wrote: If you use a balun of any kind, make sure it is connected the same way to both antennas. Many sealed baluns have phasi; /archives//html/Towertalk/2003-07/msg00255.html (8,133 bytes)
3. [TowerTalk] Length of Mast (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Mon Jun 2 07:15:37 2003; striking as they approached the grounded towers (with lots of elements) and then resume striking as the cell passed by the towers. Typical experience indicated that the lightning would stop some 1/8; /archives//html/Towertalk/2003-06/msg00034.html (8,895 bytes)
4. [TowerTalk] Stacking Distances (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Fri May 23 09:18:18 2003; Freq Ht R X SWR Gain TOA F/R 14.200 40 26.82 1.64 1.867 16.34 14 20.74 14.200 45 26.75 2.04 1.873 16.73 12 20.01 14.200 50 27.71 2.40 1.810 16.99 11 18.76 14.200 55 28.84 0.91 1.735 17.25 10 16.32 14; /archives//html/Towertalk/2003-05/msg00339.html (8,073 bytes)
5. [TowerTalk] New Propagation Articles (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Thu Feb 27 17:59:29 2003; I was reading the latest ARRL Propagation Bulletin and noticed a link to ARRL's Propagation page. There I saw two relatively new articles by Dean N6BV which were presentations to a YCCC meeting on 1; /archives//html/Towertalk/2003-02/msg00554.html (7,408 bytes)
6. [Towertalk] Terrain and TOA's (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Tue, 08 Oct 2002 17:51:53 -0400; Hi All! It's a cold rainy day here so I just spent a little time posting some interesting graphics on my webpage about terrain and takeoff angles for my 10 meter system. The graphics are from an expe; /archives//html/Towertalk/2002-10/msg00275.html (6,665 bytes)
7. [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)
8. [Towertalk] Re: SteppIR Element Placement (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Sun, 15 Sep 2002 15:53:18 +0100; YO and it appears that for a 16' boom and the DE somewhere in the middle, 16 or 17 DB F/B is about all you can achieve on 10 meters. Still, it's decent F/B for most applications. Question for a Stepp; /archives//html/Towertalk/2002-09/msg00519.html (7,736 bytes)
9. [Towertalk] Phasing Lines For Stacks (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Wed, 21 Aug 2002 22:24:33 -0400; in length? Or, can they a multiple of a wavelength longer as measured by my MFJ 259? If so, do they have to be a full wavelength longer or can it be just a multiple of a half wavelength? My gut feeli; /archives//html/Towertalk/2002-08/msg00623.html (8,930 bytes)
10. [Towertalk] Re: Phasing Lines For Stacks (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Thu, 22 Aug 2002 13:23:41 -0400; guess that´s what you want, the feedlines has to be EXACTLY the same lenght. Hi Jim! This bothered me a little too but I believe I have the answer. Consider a CW signal split to 2 phase lines,; /archives//html/Towertalk/2002-08/msg00650.html (8,506 bytes)
11. [Towertalk] Towers in Hurricanes (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Tue, 27 Aug 2002 20:57:12 -0400; extended blast of cat. 5 hurricane. Category 5 is 155 MPH or higher. Chinook winds along the front range of the Rockies are routinely 100+ MPH and a few approach category 5 strengths. We had two over; /archives//html/Towertalk/2002-08/msg00748.html (8,683 bytes)
12. [Towertalk] 4-square vs 40-2CD (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Mon, 08 Jul 2002 18:30:09 +0100; 1-2 S-units louder than the 4-square. This should be no surprise. Even a dipole up 1/2 wavelength will beat a 4-square. I recall a dipole's gain is in the order of 2-3 dB over a vertical for equivale; /archives//html/Towertalk/2002-07/msg00198.html (8,124 bytes)
13. [Towertalk] 4-square vs 40-2CD (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Mon, 08 Jul 2002 18:45:30 +0100; for equivalent grounds. I meant to say 2-3 dB over a 4-square...not a single vertical. 73, Bill W4ZV; /archives//html/Towertalk/2002-07/msg00200.html (7,964 bytes)
14. [Towertalk] Need EZNEC model for 40-2CD 40-2CD EZNEC Model (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Tue, 09 Jul 2002 14:15:02 -0400; Here's a quick look using EZNEC models I had on hand, all assuming EZNEC high-accuracy "Good" ground (0.005, 13): dBi @ peak TOA 4-square (EZNEC's 4square.ez) 5.34 @ 25 deg 4-square (EZNEC's 4sqtl.ez; /archives//html/Towertalk/2002-07/msg00230.html (7,674 bytes)
15. [Towertalk] 40M Dipoles (Was: Need EZNEC model 402CD..) (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Wed, 10 Jul 2002 07:31:06 -0400; that they are not accurate below 2 MHz. I suspect the same is true for NEC-2 and 4. Does anyone know for sure? Propagation on the low bands is not completely described by current models, especially b; /archives//html/Towertalk/2002-07/msg00262.html (9,891 bytes)
16. [Towertalk] Models and real world (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Wed, 10 Jul 2002 10:24:10 -0400; longhand as long as we stay away from limits where they fall apart. We have to know the limits of models, just like we have to know the limits of measurements. None are perfect, and many are not even; /archives//html/Towertalk/2002-07/msg00270.html (7,831 bytes)
17. [Towertalk] OWA Yagis (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Sat, 13 Jul 2002 16:45:12 +0100; KK9A: advantage other than low SWR and direct 50 ohm feed? I looked at the OWA when I was considering retuning my KLM 610's. I could see no significant gain or bandwidth difference for the same boom; /archives//html/Towertalk/2002-07/msg00374.html (7,378 bytes)
18. [Towertalk] 20M Yagi ? (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Tue, 16 Jul 2002 14:36:04 +0100; in the three main directions. Any suggestions before I start planning this next project? This is a very complex question best answered with: 1. N6BV's Terrain Analysis (YT) available with recent ARRL; /archives//html/Towertalk/2002-07/msg00430.html (8,065 bytes)
19. [Towertalk] 20M Yagi ? (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Tue, 16 Jul 2002 16:49:15 +0100; I interpreted this to mean 800' above sea level and 2-300' above surrounding terrain. Assuming this, the effective height is 2-300' plus the tower height. The immediate terrain near the antenna is ve; /archives//html/Towertalk/2002-07/msg00438.html (8,459 bytes)
20. [Towertalk] 20M Yagi ? (score: 1): Author: btippett@alum.mit.edu (Bill Tippett); Date: Tue, 16 Jul 2002 19:51:32 +0100; This is exactly what I assumed...it's similar to NC terrain. You probably confused I4JMY mentioning 800' elevation above sea level which means nothing. Only elevation above surrounding terrain is imp; /archives//html/Towertalk/2002-07/msg00443.html (10,659 bytes)

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