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281. Topband: MP clicks (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 26 May 2001 14:14:27 -0400; A word of a caution. 2 mS, while better than the stock waveform, is still far too fast for proper keyclick suppression. It is much faster than needed, and faster than the ARRL's recommended 5 mS. We; /archives//html/Topband/2001-05/msg00067.html (7,894 bytes)
282. Topband: mounting ladder line (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Mon, 28 May 2001 18:16:52 -0400; Hi Howard, What do you mean by "correct orientation"? I know there are rumors that for receiving applications the conductors have to be in a certain physical arrangement with one above the other, bu; /archives//html/Topband/2001-05/msg00078.html (7,781 bytes)
283. Topband: Re: Ground system (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 3 Apr 2001 10:40:00 -0400; The problem with measuring ground is the skin depth is quite deep on 160 meters, and the effect you see is the accumulated effect of many layers and types of soil with varying moisture. Even with ho; /archives//html/Topband/2001-04/msg00007.html (7,377 bytes)
284. Topband: London Digital Signal (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 9 Apr 2001 20:52:21 -0400; The digital transmission from London on 1851 has been anywhere from modest to booming for a week now at sunset (0000Z), then it gradually disappears. I understand that is only a 100 watt transmitter; /archives//html/Topband/2001-04/msg00024.html (6,996 bytes)
285. Topband: 160 Antenna's Modeled (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 19 Apr 2001 21:29:10 -0400; Mininec does not, to my knowledge, assume 32 1/4 wl radials. A mininec ground assumes zero earth connection loss, but does include some induced losses near the antenna. One of the most misused bits; /archives//html/Topband/2001-04/msg00051.html (9,627 bytes)
286. Topband: Elevated Radials (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 20 Apr 2001 10:54:22 -0400; Hi Joe, Some subjects will never die, and never be resolved. This is one of them. I measured elevated radials at two locations, and found four elevated radials were about 5 dB weaker than 60 radials; /archives//html/Topband/2001-04/msg00055.html (8,193 bytes)
287. Topband: Elevated Radials (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 21 Apr 2001 22:52:50 -0400; Hi Tom, I measured about 5 dB or so improvement when using 60 radials on the ground compared to a system using 4 elevated radials. If you allow 5 dB gain for the four-square plus normal meter errors,; /archives//html/Topband/2001-04/msg00061.html (8,300 bytes)
288. Topband: Take off angles (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 22 Apr 2001 21:51:04 -0400; I wonder if your facility had the capabilities to sort out polarization? What did wave angle look like at sunrise peak, or don't you get that effect in KL7? 73, Tom W8JI W8JI@contesting.com -- FAQ o; /archives//html/Topband/2001-04/msg00063.html (6,902 bytes)
289. Topband: Tee Antenna (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 25 Apr 2001 15:28:59 -0400; Wave angles below 20 degrees are quite important on 160 meters, despite rumors to the contrary. Even paths over what we may think are fairly short distances (1000 miles) are quite effective at low w; /archives//html/Topband/2001-04/msg00078.html (7,257 bytes)
290. Topband: Inverted "L" (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 26 Apr 2001 19:37:54 -0400; I'm giving a talk at Dayton on Friday in the antenna forum on traps. I've spent some spare time in the past several months building and measuring traps...and testing traps other people have sent me.; /archives//html/Topband/2001-04/msg00085.html (8,091 bytes)
291. Topband: Receiving on Directional Antenna (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 1 Mar 2001 17:27:23 -0500; Mixing in a signal from a different direction at audio is exactly like mixing it at RF! It decreases directivity and decreases S/N ratio of the system. I can record in stereo WAV files with phase-lo; /archives//html/Topband/2001-03/msg00007.html (8,621 bytes)
292. Topband: fishbone and comb antennas (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 1 Mar 2001 17:27:23 -0500; Hi Sam and all, When you find an obscure array that is not often used, you can be sure it is unpopular for a more than one reason. The sole benefit is the elimination of complex phasing lines. Nothin; /archives//html/Topband/2001-03/msg00008.html (9,611 bytes)
293. Topband: Old antennas, gain, and size (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 2 Mar 2001 13:18:54 -0500; VK4ZSS: We too often only seem to consider Ham use as "mainstream". "Flags" have been used for years, as have antennas like the "K9AY Loop". Terminated loops or arrays for daisy-chained loops called; /archives//html/Topband/2001-03/msg00023.html (9,257 bytes)
294. Topband: Beverage termination (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 2 Mar 2001 15:20:59 -0500; Hi Hal, That is a myth. Six feet of vertical drop is six feet of vertical drop, no matter how you "cut it". For an excellent example of this, look at the Pennant antenna. The long sloped end of the a; /archives//html/Topband/2001-03/msg00024.html (8,933 bytes)
295. Topband: Receiving on Directional Antenna (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 2 Mar 2001 15:38:42 -0500; I'm sure that varies with a person's ability to separate signals from each ear when mentally processing signals, and we are certainly all different. What I am not sure is if this is a "learned thing; /archives//html/Topband/2001-03/msg00025.html (8,759 bytes)
296. Topband: Shielded drop wires (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 3 Mar 2001 09:07:28 -0500; Hi Hal, This is probably worth going into, because it goes to the heart of some common misconceptions about shields. No, it will radiate EXACTLY the same as a single wire would. There is absolutely n; /archives//html/Topband/2001-03/msg00033.html (8,767 bytes)
297. Topband: FT-1000(D) click mod (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 9 Mar 2001 14:44:20 -0500; I haven't looked at an MP yet, but here are the results on a 1000(D)... The problem: Good engineering dictates never running a square rise and fall waveform into a crystal filter. The square rise-and; /archives//html/Topband/2001-03/msg00073.html (8,168 bytes)
298. Topband: FT-1000(D) click mod (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 9 Mar 2001 19:26:18 -0500; I forgot to say the resistor goes between the collector and the base of the transistor. The transistor turns on slowly because the 10uF capacitor charges through the 1.5k resistor. The stage turns o; /archives//html/Topband/2001-03/msg00081.html (7,217 bytes)
299. Topband: Re: [CQ-Contest] FT-1000(D) click mod (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 9 Mar 2001 20:52:41 -0500; AGC is a problem, but if the radio has overload anywhere before the narrow filter you are in deep trouble with far more than clicks and it would take more than AGC to fix it. The receiver will also; /archives//html/Topband/2001-03/msg00082.html (7,877 bytes)
300. Topband: Water Conductivity (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 22 Mar 2001 06:45:46 -0500; KN4LF: When we did broadcast proofs in the Lake Erie/ Lake Huron areas, both lakes had a conductivity of about 6 or 8. Surrounding land ranged from 10 to 30mS/m. The 30mS/m stuff was very wet black s; /archives//html/Topband/2001-03/msg00113.html (7,824 bytes)

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