Mail Archive Search: <+from:W8JITom@aol.com>

Results:

References: [ +from:W8JITom@aol.com: 85 ]

Total 85 documents matching your query.

61. TopBand: Shock Hazard. Read this!!! (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Thu, 17 Oct 1996 08:50:44 -0400; Woops. Thanks for pointing that out. Did I say neutral? I meant to say safety ground, not neutral. That is the connection made to the outside of metal outlet boxes, and the retaining screw of the wal; /archives//html/Topband/1996-10/msg00223.html (8,309 bytes)
62. TopBand: Re: Summary I: Feeding 160 Inverted-L (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Thu, 17 Oct 1996 15:56:14 -0400; The net result is the ground current and losses are exactly the same either way, folding the element does not change the radiation resistance or current or loss of the ground system. You merely chang; /archives//html/Topband/1996-10/msg00232.html (8,393 bytes)
63. TopBand: Rust In Parallel (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Thu, 17 Oct 1996 15:56:12 -0400; I'd pay attention to Eric's post. It's the best and most accurate explaination of field theory I've seen put into simple terms. (even though I can't seem to e-mail him direct, hi) It's postulation wi; /archives//html/Topband/1996-10/msg00233.html (9,655 bytes)
64. TopBand: Cut the ground lead (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Fri, 18 Oct 1996 05:28:45 -0400; One final comment (I hope). Don't expect cutting the PHYSICAL connection to earth will suddenly stop earth loss near the antenna, or will make FS suddenly much better. With four elevated radials ther; /archives//html/Topband/1996-10/msg00242.html (7,763 bytes)
65. TopBand: KH6AT, beacon question (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Sat, 19 Oct 1996 15:25:37 -0400; KH6AT was loud in Atlanta at 0700Z but nothing else on 160. I'm hearing a loud harmonic of a VLF beacon. The carrier is on 1855KHz and the sidebands every ~ 1 kHz up and down (as far as 1840 down). T; /archives//html/Topband/1996-10/msg00260.html (6,805 bytes)
66. TopBand: How many radials ? (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Sun, 20 Oct 1996 22:30:48 -0400; First, I agree in this specific case base impedance is a reasonable indicator of system loss, but base impedance measurements can be misleading if the ground system is resonant! It is possible to hav; /archives//html/Topband/1996-10/msg00290.html (8,481 bytes)
67. TopBand: Re: beacon question (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Mon, 21 Oct 1996 12:48:10 -0400; in Thank for all the responses. I switched my phased loops around towards Paducah, and I could faintly hear the FIO on the fundamental in step with the 160 meter signal. The usual problem is these b; /archives//html/Topband/1996-10/msg00300.html (7,642 bytes)
68. TopBand: Re: How many radials ? (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Tue, 22 Oct 1996 16:20:58 -0400; Yes, Eric's address is not taking direct E-mail, hi. Bob, I guess sometimes this stuff comes out wrong but let me try to interject something that is very important. Ground loss is totally dependent o; /archives//html/Topband/1996-10/msg00313.html (8,219 bytes)
69. TopBand: Feedline Thread (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Wed, 23 Oct 1996 15:50:13 -0400; Hi Ward, The unbalanced antenna and load (the receiver is the load) would give you common mode problems, but if you handle them properly the line will work well. You will need a choke type balun at t; /archives//html/Topband/1996-10/msg00328.html (7,875 bytes)
70. TopBand: 94W131 (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Fri, 25 Oct 1996 16:29:27 -0400; I hear them here in Georgia at all hours after midnight, they are to the general west direction. I've logged about five of em. I also still hear the harmonic of FIO on 1845-1855 (every one KHz), wait; /archives//html/Topband/1996-10/msg00362.html (7,153 bytes)
71. TopBand: Inverted-L question (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Mon, 30 Sep 1996 19:27:30 -0400; It is important to remember that while a more extensive ground system helps, there is virtually no difference between 50- 60 radials and 100-120 radials IF the radials are only 1/4 wl long. At 3 MHz,; /archives//html/Topband/1996-09/msg00000.html (8,790 bytes)
72. TopBand: 160/80M beverage lengths, transmitting antennas (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Tue, 10 Sep 1996 22:00:33 -0400; Hi Jerry, In several tests here, both in Ohio and here in Georgia, current tapered to somewhere between 75% and 50% of the initial value in 500 ft of distance along a Beverage wire eight feet high on; /archives//html/Topband/1996-09/msg00068.html (10,419 bytes)
73. TopBand: Shared Beverages ? (Wire type) (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Wed, 11 Sep 1996 10:51:16 -0400; I have done that, as well as using the Beverages for receiving two directions at the same time without interaction. I build my own components. I have no experience with ICE. You can use a conventiona; /archives//html/Topband/1996-09/msg00071.html (7,884 bytes)
74. TopBand: Shared Beverages ? (Wire type) (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Wed, 11 Sep 1996 19:41:47 -0400; There is so much ambient noise on 160 that both ends of the antenna can be returned to the shack (when properly matched) and terminated with a high input impedance amp bridged across the actual termi; /archives//html/Topband/1996-09/msg00079.html (8,779 bytes)
75. TopBand: Need advice on EWE installation (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Wed, 11 Sep 1996 21:59:45 -0400; I tried EWE's here and they were useless. Soil about 4 mS/m. The only way I could get them to work at all was with a large ground screen, and that was too much work. I did a EWE survey last year on t; /archives//html/Topband/1996-09/msg00085.html (8,352 bytes)
76. TopBand: Ground clarification (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Thu, 12 Sep 1996 13:25:14 -0400; rods? >Aren't we trying to isolate the feed line from ground at the antenna? Not necessarily. We are trying to establish something "electrically firm" for the antenna to "push or work against". On re; /archives//html/Topband/1996-09/msg00088.html (7,974 bytes)
77. TopBand: EWEs (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Fri, 13 Sep 1996 10:42:39 -0400; Hi Bernard I agree totally. The EWE is a simple pair of verticals with a horizontal feedline. The array is small enough current is uniform and the vertical are fed cross fore with 180 degree shift pl; /archives//html/Topband/1996-09/msg00090.html (8,015 bytes)
78. TopBand: EWEs (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Sat, 14 Sep 1996 10:41:56 -0400; The point remains, the EWE is a pair of short phased verticals carrying uniform current with the single wire line a short phasing section. Even two small verticals can improve S/N ratio many, many dB; /archives//html/Topband/1996-09/msg00099.html (7,853 bytes)
79. TopBand: receiving antennas (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Mon, 16 Sep 1996 10:34:33 -0400; Actually a Beverage (or any other long wire array) supplies among the lowest directivity per acre of space of any array. The saving grace is that they are simple and easy to build, and more forgiving; /archives//html/Topband/1996-09/msg00120.html (8,212 bytes)
80. TopBand: Loaded Beverage (score: 1): Author: W8JITom@aol.com (W8JITom@aol.com); Date: Mon, 16 Sep 1996 20:14:41 -0400; I received about a dozen E-mails asking for the size of the coils. The coil reactance will vary quite a bit with the impedance of the antenna. When I was experimenting with my loaded Beverages it was; /archives//html/Topband/1996-09/msg00122.html (7,207 bytes)

Current List: 61 - 80
Page: [1] [2] [3] [4] [5]