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Total 693 documents matching your query.

161. [TowerTalk] F connectors et al (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Thu, 9 Aug 2001 19:51:35 -0700; When I worked in the CATV world a few years back, we had some type N (75 ohm) to F connectors that worked very well passed 1 GHz (24 dB return loss on an HP8753C with 75 ohm test set). These were mad; /archives//html/Towertalk/2001-08/msg00225.html (9,711 bytes)
162. [TowerTalk] Schematic for JPS ANC-4 (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Sun, 12 Aug 2001 07:15:24 -0700; Does anyone know where I can get a schematic for the JPS ANC-4? Thanks! Mike, W4EF List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems, Trylon Titan towers, coax, hardline and more.; /archives//html/Towertalk/2001-08/msg00252.html (6,894 bytes)
163. [TowerTalk] Return Loss of feedline (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Sun, 12 Aug 2001 17:43:54 -0700; Hi Geo, I don't know what frequency you are using to make your measurements, but the numbers sound about right for 21 or 28 MHz (~1dB/100 feet). The 14dB return loss of the balun/antenna feed corresp; /archives//html/Towertalk/2001-08/msg00266.html (9,366 bytes)
164. [TowerTalk] Wattmeters and 75 ohm Coax (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Sun, 19 Aug 2001 09:50:02 -0700; Hi Bob, I don't know about 75 ohm options for the Bird 43 or Coaxial Dynamics Wattmeters. You might want to call the factory and ask them if they can modify the directional couplers for a 75 ohm char; /archives//html/Towertalk/2001-08/msg00426.html (10,470 bytes)
165. [TowerTalk] my KT34XA is high on 10-15m after cleaning contacts !!! (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Wed, 29 Aug 2001 22:03:26 -0700; Hi Marc, I had the same problem when rebuilding a KT-34XA. I could not get the capacitor tube straps tight with just a single layer of aluminum shim material. I used two layers of .010" (.25mm) shim; /archives//html/Towertalk/2001-08/msg00673.html (11,875 bytes)
166. [TowerTalk] PVC and UV (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Thu, 30 Aug 2001 13:47:19 -0700; Hi Ford, I think the gray stuff used for electrical wiring applications may be UV stable. Also, I recall the solar water heater system for my Aunt's pool in Florida used PVC pipe much of which was ab; /archives//html/Towertalk/2001-08/msg00704.html (9,383 bytes)
167. [TowerTalk] Antenna area: specs vs truth (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sat, 9 Jun 2001 19:10:43 -0700; Sounds about right, Gene - 46 feet x ~3/4" avg dia = (46 ft) * (0.75 in) /(12 in/ft) ~ 3 sq ft. Mike, W4EF........... List Sponsor: Are you thinking about installing a tower this summer? Call us for; /archives//html/Towertalk/2001-06/msg00164.html (8,706 bytes)
168. [TowerTalk] Antenna surface area (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sat, 9 Jun 2001 19:31:51 -0700; Bill, Gene specifically said that he was calculating projected area without any shape factors. The projected surface area at right angles to a cylindrical tube is simply diameter x length. The effect; /archives//html/Towertalk/2001-06/msg00166.html (14,239 bytes)
169. [TowerTalk] Ginpole for 20 foot sections (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Wed, 13 Jun 2001 12:01:18 -0700; Hi all, The gin pole feels a downward force equal to twice the attached load. Thus the person pulling the rope has a 2:1 advantage in terms of his or her ability to push the tower down into the groun; /archives//html/Towertalk/2001-06/msg00313.html (13,686 bytes)
170. [TowerTalk] Ginpole for 20 foot sections (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 14 Jun 2001 05:13:54 -0700; Same thing, Jim. Imagine that the tower is sitting in soft ground and starts to sink under the load suspended from the gin pole. With the configuration you describe (pull rope tied to a tree), the lo; /archives//html/Towertalk/2001-06/msg00344.html (16,811 bytes)
171. [TowerTalk] Drilling Chrome-Moly Steel (score: 1): Author: Mike" <W4EF@dellroy.com (Mike); Date: Tue, 19 Jun 2001 07:08:59 -0700; About a year ago, I drilled and pinned a 2" chrome moly mast on the tower (70') for the local club station. We used a Makita cordless drill and some brand new HSS bits. I was pleasantly surprised at; /archives//html/Towertalk/2001-06/msg00469.html (11,554 bytes)
172. [TowerTalk] Vatican to cut broadcasts over ecological fight (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Wed, 11 Apr 2001 05:02:17 -0700; Probably a political thing. Its much easier (and cheaper) to pull the plug on the Pope's 500 KW MW transmitter and make all the suckers (err, I mean constituents) think you have solved the problem th; /archives//html/Towertalk/2001-04/msg00265.html (11,657 bytes)
173. [TowerTalk] DOVETRON Stealth (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Tue, 13 Mar 2001 01:42:48 -0800; Hi Bob, I would put this thing in the same category as the guy who charges cancer patients to pump ozone up their butts. As with any con job, there is a kernel of truth to what he is selling - the co; /archives//html/Towertalk/2001-03/msg00240.html (9,796 bytes)
174. [TowerTalk] FW: RFI suppression (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 22 Mar 2001 05:13:58 -0800; Hi Eric, You might try winding the coax lead between the tuner and the rig into an RF choke. You might also, try hanging some counterpoise wires off the chassis of the tuner (1/4 wavelength on the ba; /archives//html/Towertalk/2001-03/msg00436.html (10,608 bytes)
175. [TowerTalk] Weight of KLM 40M4 (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Sat, 24 Mar 2001 02:11:53 -0800; Jim, Make sure you know which version of the antenna you are getting. There was a heavy duty boom option for the 40M4 in which the thin wall 3" O.D. boom sections are replaced with 1/4" wall x 3" O.D; /archives//html/Towertalk/2001-03/msg00495.html (9,663 bytes)
176. [TowerTalk] Mosley Pro 95 (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Mon, 26 Mar 2001 10:00:17 -0800; Hi Stephanie, I am not sure of the boom length or wind surface area of the Pro95, but it sounds like its comparable to other big tribanders like the Hy-Gain TH7 or KLM KT34XA. If this is the case, th; /archives//html/Towertalk/2001-03/msg00504.html (9,772 bytes)
177. [TowerTalk] COAX connector heating (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Fri, 30 Mar 2001 16:03:14 -0800; RG8X jumpers warm slightly at 1500W on 10 meters due to the small but finite loss. The heating is distributed roughly uniformly (depending on VSWR) along the length of the coax, so it should not be a; /archives//html/Towertalk/2001-03/msg00670.html (10,400 bytes)
178. [TowerTalk] Quad vs. yagi (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Thu, 8 Feb 2001 09:59:26 -0800; The one advantage of the Quad vs Yagi that no one has mentioned is turning radius. When I was going to school, our club station was saddled with a small tower stuck between two flag poles. The only w; /archives//html/Towertalk/2001-02/msg00210.html (14,629 bytes)
179. [TowerTalk] Quad vs. yagi (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Fri, 9 Feb 2001 03:22:27 -0800; Hi Yuri, At the risk of sounding like a scientist, I am curious to know if you have ever sucummbed to temptation and modeled your razors with EZNEC or AO. You could share these results with the rest; /archives//html/Towertalk/2001-02/msg00230.html (10,569 bytes)
180. [TowerTalk] quads (score: 1): Author: Michael Tope" <W4EF@dellroy.com (Michael Tope); Date: Fri, 9 Feb 2001 15:02:50 -0800; Yuri - please see my comments below. Thanks - Mike, W4EF............. You should both publish your models for peer review (oops that too much like science). Yuri, by this statement I gather that you; /archives//html/Towertalk/2001-02/msg00241.html (28,544 bytes)

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