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61. [Towertalk] Quad vs Yagi (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Wed, 20 Nov 2002 08:18:07 -0800; A recurring theme that I have noticed in this and other threads on the quad versus the yagi is the anecdotal claim that quads are quieter for receiving than the equivalent Yagi. There could be a good; /archives//html/Towertalk/2002-11/msg00530.html (13,180 bytes)
62. [Towertalk] Ref: Fiberglass Mast (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Fri, 6 Sep 2002 01:07:25 -0700; Ed, Don't forget that if you run feedlines up the fiberglass mast past your lower antennas to get to the higher antennas, then you will to some extent defeat the purpose of having a nonconductive mas; /archives//html/Towertalk/2002-09/msg00212.html (9,004 bytes)
63. [Towertalk] Mast Coupler (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Wed, 11 Sep 2002 20:57:53 -0700; Actually the Orion OR-2800 does exactly what you describe, Yuri. It is a self locking worm gear design (no brake), with a programmable ramp-up and ramp down feature. Rotation speed can also be progra; /archives//html/Towertalk/2002-09/msg00396.html (9,468 bytes)
64. [Towertalk] Stub tuning (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Fri, 13 Sep 2002 09:23:08 -0700; Yes, but the SWR curves are typically pretty broad, so sensitivity is not the greatest. Better to put a wattmeter between the T and the globar and look at forward power at the harmonic. Forward power; /archives//html/Towertalk/2002-09/msg00434.html (8,789 bytes)
65. [Towertalk] Need Antenna Advice! (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Fri, 13 Sep 2002 10:59:53 -0700; You can probably get a good feel for the SteppIR performance by modeling/optimizing a 3 element monobander on the same boom length and element spacing as the SteppIR. The main limitation of the Stepp; /archives//html/Towertalk/2002-09/msg00442.html (9,613 bytes)
66. [Towertalk] Need Antenna Advice! (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Fri, 13 Sep 2002 15:41:52 -0700; Yeah, Mark, the real trick setup would be a stepper actuated telescoping boom with SteppIR elements attached (it wouldn't surprise me if they were already working on one). 73 de Mike, W4EF...........; /archives//html/Towertalk/2002-09/msg00458.html (10,049 bytes)
67. [Towertalk] Need Antenna Advice! (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Fri, 13 Sep 2002 17:35:40 -0700; Steve, There is an optional fixed 6 meter director available for the SteppIR that is suppose to greatly improves the F/B ratio: http://www.steppir.com/ Look under the "products" tab for the "6 meter; /archives//html/Towertalk/2002-09/msg00463.html (12,697 bytes)
68. [Towertalk] SWR & Speed of Light? (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Wed, 25 Sep 2002 23:01:01 -0700; Hey Jon, Group velocity or perhaps more aptly "information velocity" is always less than or equal to the speed of light in a vacuum, but the "phase velocity" or the speed at which a constant phase po; /archives//html/Towertalk/2002-09/msg00846.html (13,808 bytes)
69. [Towertalk] 45G (guyed) vs. SSV (self-supp'g) 70-ft. tower (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Mon, 30 Sep 2002 13:06:21 -0700; I will probably get flamed for this, but I can't resist. Aren't those Rohn specs for 45G super conservative (8sq ft at 90 MPH) because they place the top set of guys so far below the top of the tower; /archives//html/Towertalk/2002-09/msg00977.html (11,798 bytes)
70. Re: [Towertalk] Mast Coupler (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Sat, 10 Aug 2002 22:21:17 -0700; Dennis, Warren, KE6LEA and I put together the flex-disc shock absorber scheme pictured below for the M^2 OR-2800 rotator at W6UE: http://www.cco.caltech.edu/~w6ue/KT/OR-2800-1.jpg Warren got the flex; /archives//html/Towertalk/2002-09/msg00983.html (10,235 bytes)
71. [Towertalk] Bury - Flex Information (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sun, 11 Aug 2002 07:00:14 -0700; Ford, VF is not a function of cable dimensions. Cable dimensions effect stuctural impedance and losses. Vf is strictly a function of the characteristics of the dielectric material, in this case perha; /archives//html/Towertalk/2002-08/msg00343.html (10,782 bytes)
72. [Towertalk] fence update (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Thu, 15 Aug 2002 08:36:07 -0700; Paul, If it turns out to be the fence, maybe you can break it up with insulating sections much in the same way you would break up a guy wire. My guess is that you would probably only need to do this; /archives//html/Towertalk/2002-08/msg00464.html (10,322 bytes)
73. [Towertalk] fence update (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Thu, 15 Aug 2002 09:27:43 -0700; Paul, are the interwoven/intertwined wires insulated from one another, or are they touching? If they are touching, the whole thing probably looks like the equivalent of a continuous strip conductor a; /archives//html/Towertalk/2002-08/msg00467.html (8,182 bytes)
74. [Towertalk] Re: Phasing Lines For Stacks (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Thu, 22 Aug 2002 11:00:59 -0700; That is correct Bill. Unless the delay is significant relative to the rise time of the signal, you will never know the difference. If you were phasing NTSC video transmitters or high bit rate digital; /archives//html/Towertalk/2002-08/msg00651.html (10,135 bytes)
75. [Towertalk] Mast Coupler (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sat, 10 Aug 2002 22:21:17 -0700; Dennis, Warren, KE6LEA and I put together the flex-disc shock absorber scheme pictured below for the M^2 OR-2800 rotator at W6UE: http://www.cco.caltech.edu/~w6ue/KT/OR-2800-1.jpg Warren got the flex; /archives//html/Towertalk/2002-08/msg00807.html (8,519 bytes)
76. [Towertalk] 20M Yagi ? (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Tue, 16 Jul 2002 19:12:21 -0700; Mauri, How about the case where the ground immediately under the antenna is very close, but there is also a nearby cliff? Ray tracing to the point of distant reflection suggests this antenna will pro; /archives//html/Towertalk/2002-07/msg00448.html (12,769 bytes)
77. [Towertalk] SteppIR Power Handling (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sun, 28 Jul 2002 10:28:05 -0700; Rick/Tom, If you look at the SteppIR "view brochure" hyperlink on their homepage, they mention specifically (about 1/2 way through the brochure) that the 1500 Watt rating is continuous CW or SSB. The; /archives//html/Towertalk/2002-07/msg00748.html (9,418 bytes)
78. [Towertalk] NYS PRB-1 Needs Your Help Now! (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sat, 29 Jun 2002 20:56:31 -0700; I suspect Gov. Davis got a big contribution from the Homeowners Association lobby group. Mr. Davis is very effective at raising lots of money for his political campaigns (he has a $30 to 40 million d; /archives//html/Towertalk/2002-06/msg00508.html (20,942 bytes)
79. [Towertalk] Antenna Analyzer Suggestions? (score: 1): Author: W4EF@dellroy.com (Mike); Date: Sat, 4 May 2002 10:07:26 -0700; The MFJ-269 has a 12bit A/D converter whereas the 259B only used 8 bits to digitize the detector voltages. From what I have heard this gives the 269 more accuracy at high and low values of impedance; /archives//html/Towertalk/2002-05/msg00089.html (10,367 bytes)
80. [Towertalk] Rope (score: 1): Author: W4EF@dellroy.com (Mike); Date: Sun, 5 May 2002 20:43:41 -0700; I had a 35' Rohn 25 tower that was bracketed at the 8' level. If you run the numbers you will find this sort of installation is good to ~150 MPH with no antennas. With a Cushcraft A3 tribander on top; /archives//html/Towertalk/2002-05/msg00116.html (9,491 bytes)

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