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321. Topband: 160 Meter Propagation (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Sun, 7 Jan 2001 09:06:38 -0500; I wonder about the same thing. The path from my QTH to Europe is mostly over land, and actually comes closer to the pole than a New England to Europe path. It's also about 25% further to western Eur; /archives//html/Topband/2001-01/msg00074.html (9,702 bytes)
322. Topband: Lazy U Antenna (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Sun, 7 Jan 2001 20:11:52 -0500; Hi Denny, You bring up a good point. It is totally unreasonable to consider a low horizontal wire carrying substantial currents or having significant voltage as "lossless" when that wire is a small f; /archives//html/Topband/2001-01/msg00084.html (7,335 bytes)
323. Topband: JA opening this morning (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Mon, 8 Jan 2001 12:35:03 -0500; We probably need to remind the JA's that 1820 is no good, just as 1830 and 1840 are no good, for zero beat CW signals. CW DX should just avoid being on the "10's" when working USA. The signal on 182; /archives//html/Topband/2001-01/msg00094.html (7,133 bytes)
324. Topband: Minimum discernible signal ? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 10 Jan 2001 05:36:15 -0500; Hi Tony, That's fine Tony, but you have to consider the spacing of the test signals used in the ARRL tests. Virtually all receivers today have a roofing filter that follows the first mixer. This filt; /archives//html/Topband/2001-01/msg00110.html (15,638 bytes)
325. Topband: Carriers-QRM (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Wed, 10 Jan 2001 11:36:39 -0500; Hi Robin, It seems the rule would be to avoid frequencies that are divisible by a number between two and four, with the result of that division falling on a number ending in 9 or 0. 73, Tom W8JI w8ji; /archives//html/Topband/2001-01/msg00117.html (6,997 bytes)
326. Topband: A simple rule (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Thu, 11 Jan 2001 10:25:07 -0500; I've been talking to Robin off line. I'm convinced! No need for complications or a list. The rule........starting at 1800 kHz every ten kHz up can be a problem in the USA (1810, 20, 30 etc), every 9; /archives//html/Topband/2001-01/msg00125.html (6,682 bytes)
327. Topband: Receiver problems. (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 12 Jan 2001 13:04:02 -0500; I'm sure you know what you are saying, but it came out wrong. The above usually isn't true. Many or most receivers today have much worse close-spacing than wide-spacing performance. I think what you; /archives//html/Topband/2001-01/msg00136.html (9,431 bytes)
328. Topband: Loaded Beverages (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Sun, 14 Jan 2001 08:41:55 -0500; I modeled a Beverage 250 ft long and six feet high. Using four loads spaced 20,40,60 and 80 percent, optimum pattern occurred with with 400 ohm reactance series connected inductors and 900 ohms termi; /archives//html/Topband/2001-01/msg00142.html (8,045 bytes)
329. Topband: Ar2 Preamp (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 14 Jan 2001 19:43:48 -0500; Hi Milt, I just measured an AR2. Output power 1 dB gain compression -11dBm NF .6 dB gain: 1.8......... 24.31 dB 7.0..........15.15 30............13.48 50.............13.85 400............7.98 This is; /archives//html/Topband/2001-01/msg00150.html (7,992 bytes)
330. Topband: Re: Minimum discernible signal ? (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Mon, 15 Jan 2001 08:02:43 -0500; Mario replies: excessive. I know you keep saying that Mario, but the numbers indicate otherwise. My noise floor at night through a low-gain preamplifier that just offsets feedline loss is about -119; /archives//html/Topband/2001-01/msg00155.html (9,286 bytes)
331. Topband: Dual band array (score: 1): Author: w8ji@contesting.com (Tom Rauch); Date: Wed, 17 Jan 2001 12:21:21 -0500; Hi Roger, I have no idea why everyone ever settled on 1/4 wl on a side and 90/180 shift. The phase is clearly wrong for the spacing since the mean element spacing is closer than 1/4 wl when fired acr; /archives//html/Topband/2001-01/msg00181.html (8,543 bytes)
332. Topband: RX input impedance (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 19 Jan 2001 06:21:20 -0500; Hi Ford, The results might not be accurate. The VA-1 can overload the RF stage, and that will normally change the impedance. I care here, because: 1.) I use narrow selectivity and external noise powe; /archives//html/Topband/2001-01/msg00189.html (7,264 bytes)
333. Topband: RE: BOG antenna notes (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Fri, 19 Jan 2001 06:21:20 -0500; Hi Fritz, Some food for thought.... What is an elevation pattern? If it is TOA, it is an often-misused term with antennas. The important thing is the absolute response at the desired angle compared t; /archives//html/Topband/2001-01/msg00190.html (8,341 bytes)
334. Topband: Top Loading (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 22 Jan 2001 07:41:22 -0500; Hi ALan, You have to be very careful with internet freeware "programs". While intended to be helpful, they are so simple they overlook many many important things. I've tried to compare results using; /archives//html/Topband/2001-01/msg00216.html (7,313 bytes)
335. Topband: Re: [TowerTalk] precipitation static & folded verticals (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 22 Jan 2001 07:41:21 -0500; Hi Eric, You won't find any data on this, because there isn't any reason to take the data in the first place. Precipitation static is caused by corona discharges from the antenna or from other struct; /archives//html/Topband/2001-01/msg00218.html (8,923 bytes)
336. Topband: USA 160 meter News (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 23 Jan 2001 05:28:42 -0500; The following 160 meter related news from the ARRL BOD meeting over the weekend in Irving, Texas. I'm adding a couple comments of my own following the double asterisks. The Board: approved a motion; /archives//html/Topband/2001-01/msg00227.html (9,575 bytes)
337. Topband: re: Ultralinear amps (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 28 Jan 2001 19:58:06 -0500; I think there may be some exaggeration of how much "noiseless feedback" helps. It is not required for high intercept or compression points, it mainly allows the designer to greatly reduce gain and c; /archives//html/Topband/2001-01/msg00250.html (8,623 bytes)
338. Topband: Re: INV L matching (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 29 Jan 2001 14:18:59 -0500; K6XK/0: Hi Roy, That only works with a unity match when the antenna is shorter than 1/4 wl long, so it presents capacitive reactance at the antenna terminals. The antennas capacitive reactance forms; /archives//html/Topband/2001-01/msg00258.html (7,997 bytes)
339. Topband: Inverted L Matching (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 29 Jan 2001 14:02:50 -0500; Since the systems we use are all normalized to 50 ohms, the SWR on a length of 50 ohm cable is constant along its entire length except for loss. The SWR, normalized to 50 ohms, would be 2:1 no matte; /archives//html/Topband/2001-01/msg00263.html (8,488 bytes)
340. Topband: Goniometers and 160 (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 31 Jan 2001 10:37:49 -0500; Hi Ford, Goniometers do NOT, by themselves, vary phase delay. They vary amplitude ratio (mostly between adjacent inputs) and can flip-thephase 180 degrees on any given input group (when rotated 180 d; /archives//html/Topband/2001-01/msg00272.html (8,894 bytes)

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