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181. Topband: BCK (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 23 Feb 2002 15:37:38 -0500; I've received several e-mails about BCK on 1812kHz. This is the harmonic of an airport NDB in Black River Falls WI, and it is audible down here. Another person on this reflector contacted the FCC abo; /archives//html/Topband/2002-02/msg00147.html (6,799 bytes)
182. Topband: Noise and reception (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 23 Feb 2002 15:37:38 -0500; Hi Steve, Atmospheric noise is just like skywave signals. It is random in polarization. It can only be reliably discriminated against with antenna directivity in azimuth or elevation response without; /archives//html/Topband/2002-02/msg00148.html (8,370 bytes)
183. [SECC] Re: Topband: Conditions on 160m last night (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 23 Feb 2002 18:34:07 -0500; Right you are John, I know of many other people who do the same. Like you, and like them, I just simply refuse to work ANYONE I hear below 1840 even if they move up the band later. Let them go low i; /archives//html/Topband/2002-02/msg00153.html (8,510 bytes)
184. Topband: Let's try stuff (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 24 Feb 2002 11:53:55 -0500; Hi Steve, ON4UN's book in section 2.5 "postulates" coupling to the ionosphere near the equator is *less* for horizontals. No where do we find a statement that it is xx dB, and the text even qualifies; /archives//html/Topband/2002-02/msg00170.html (14,201 bytes)
185. SV: Topband: 160 band plan (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 24 Feb 2002 12:56:00 -0500; Hi Ole, I always look forward to working SSB DX in the CQ 160 SSB, but the DX is always covered up by strong and sometimes wide SSB stations who call CQ and are only able to work stations that are l; /archives//html/Topband/2002-02/msg00172.html (7,535 bytes)
186. Topband: Digimodes (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 24 Feb 2002 20:53:54 -0500; Hi Bill, I'd like to do some weak signal CW to PSK comparisons with someone, with really weak signals! I'd also like to apologize for the manners of some ops. I do know for a fact there are people, b; /archives//html/Topband/2002-02/msg00190.html (8,057 bytes)
187. Topband: Beverage grounds (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 25 Feb 2002 20:32:40 -0500; As a normal part of installing Beverages, I always sweep the Beverage with an analyzer and look for standing waves. As a normal part of maintenance, I record the swept SWR so I can tell if anything; /archives//html/Topband/2002-02/msg00217.html (8,468 bytes)
188. SV: Topband: 160m band plan (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 25 Feb 2002 20:32:40 -0500; Hi Bill, It was coming from a station in Virginia on 1912kHz. It took nearly a half-hour to find him! He was only 20 over 9 on 1912, and 10 over on 1820-24! That's why he was so hard to find. 73, To; /archives//html/Topband/2002-02/msg00218.html (7,477 bytes)
189. Topband: Beverage grounds (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 27 Feb 2002 12:04:32 -0500; Hi Larry, This has been discussed in past threads on measuring ground resistance, but unfortunately the low-frequency AC or dc resistance has no fixed relationship to RF resistance at various frequen; /archives//html/Topband/2002-02/msg00234.html (8,471 bytes)
190. Topband: Sub-band for split operation mirroring the DX window? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 27 Feb 2002 12:04:32 -0500; We often tend to focus on this as a contest problem or ragchewer problem, and it is not. It is a rule problem and so it is also a day to day problem. For example, last night just in casual tuning I; /archives//html/Topband/2002-02/msg00235.html (8,267 bytes)
191. Topband: TOP BAND RECEIVING ANTENNAS (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 6 Jan 2002 18:39:08 -0500; You should also check out www.w8ji.com, and if you are interested in modelling arrays pay particular attention to http://www.w8ji.com/receive_antennas/3374 That article dispells some of the common m; /archives//html/Topband/2002-01/msg00034.html (7,671 bytes)
192. Topband: Re: [CQ-Contest] Re: Topband: TOP BAND RECEIVING ANTENNAS (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 8 Jan 2002 12:48:43 -0500; The old argument or idea you never need an amplifier is just as silly as saying you always do need an amplifier. I would guess the "rule" we never need -140dBm sensitivity is based on a suburban loc; /archives//html/Topband/2002-01/msg00047.html (8,752 bytes)
193. Topband: BC Images (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sat, 12 Jan 2002 19:36:03 -0500; I would think anyone in or near the USA would hear some harmonics, unless their noise floor is covering them up. Most of the harmonics and spurious are fairly weak here however. I hear multiple stat; /archives//html/Topband/2002-01/msg00081.html (7,629 bytes)
194. Topband: Dedicated topband transceiver (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 13 Jan 2002 10:43:33 -0500; With no RF amp, it is possible to get into the -130dB or better range on sensitivity. But the biggest problems are actually poor filtering, poor gain distribution, and simple design errors. Narrow f; /archives//html/Topband/2002-01/msg00086.html (8,970 bytes)
195. Topband: 5R8FU (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 13 Jan 2002 10:43:33 -0500; Keep in mind there are often huge differences in receiving between stations in the same general area. It also pays to check the digital signals on the band. The digital signals on 1803.5 and 1851kHz; /archives//html/Topband/2002-01/msg00087.html (7,044 bytes)
196. Topband: Clicks (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 14 Jan 2002 12:55:46 -0500; Using a noise blanker is a bad idea, but you know with a simple design change we COULD use our blankers with overload problems....but that is for another day. After some more thought, I revisited th; /archives//html/Topband/2002-01/msg00096.html (9,175 bytes)
197. Topband: FT-1000MP Key Clicks? (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 17 Jan 2002 03:05:03 -0500; Hi Earl, For anyone interested, Kevin W9CF has an analysis (and demonstration I believe) of clicks on his Web page at http://fermi.la.asu.edu/w9cf/articles/click/index.html Most people report being s; /archives//html/Topband/2002-01/msg00114.html (10,010 bytes)
198. Topband: Re: dedicated topband transceiver (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 17 Jan 2002 08:10:31 -0500; Hi Steve, Be careful with that mod. It is almost the same as adding an RF preamplifier! The only selectivity in front of the added gain is the roofing filter, and so Blocking and IM dynamic range dec; /archives//html/Topband/2002-01/msg00119.html (9,287 bytes)
199. Topband: Meanook again (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 17 Jan 2002 08:10:31 -0500; **NEVER** abandon 160 when the K sums are high! That is the time to watch the band. Propagation was not only excellent to you Greg, it was excellent to the rest of the world even on near-polar paths; /archives//html/Topband/2002-01/msg00120.html (7,345 bytes)
200. Topband: FT-1000MP Key Clicks (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 17 Jan 2002 21:02:55 -0500; Hi Pete, According to my notes, I've received a total 23 e-mails from MKV owners asking for a click mod (prior to this topic coming up). Three MK V owners said others constantly complain about their; /archives//html/Topband/2002-01/msg00131.html (8,579 bytes)

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