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81. RE: Topband: HV capacitor (score: 1): Author: "Richard (Rick) Karlquist (N6RK)" <richard@karlquist.com>; Date: Thu, 16 Dec 2004 08:06:22 -0800; Another illustration of this is feedthru capacitors: Conventional ones are coaxial, the "obvious" way to make them. However, a much better way to make them is the so called "discoidal type", which in; /archives//html/Topband/2004-12/msg00225.html (9,146 bytes)
82. Re: Topband: Re: Coax capacitor losses (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Fri, 17 Dec 2004 11:48:38 -0800 (PST); You also need to know how much of the loss is due to dielectric loss tangent vs conductor resistance. For a matched 50 ohm line at 1.8 MHz, the dielectric loss is negligible. However, it may be signi; /archives//html/Topband/2004-12/msg00242.html (7,713 bytes)
83. RE: Topband: Re: Coax capacitor losses (score: 1): Author: "Richard (Rick) Karlquist (N6RK)" <richard@karlquist.com>; Date: Fri, 17 Dec 2004 20:40:09 -0800; You cannot calculate "loss resistance" using only a Smith chart, and the dB/ft loss specs. Instead of just dB/ft, you need to know conductor resistance per foot and dielectric conductance per foot. R; /archives//html/Topband/2004-12/msg00247.html (8,096 bytes)
84. Re: Topband: buried radial problems. (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 22 Dec 2004 12:23:07 -0800 (PST); If you simply model a top loaded ("T" type) vertical on EZNEC, you can see that if you get enough top loading wire in the air, you can get the drive impedance up about as high as you want. This has; /archives//html/Topband/2004-12/msg00282.html (8,420 bytes)
85. Topband: Europe at last (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Sat, 8 Jan 2005 23:14:41 -0800 (PST); Great condx last night in Galt in central CA. First ever Euro's heard here, and two were worked: OO4UN and OM3BH. EA3JE was considerably stronger, but didn't seem to be able to hear the west coast. E; /archives//html/Topband/2005-01/msg00146.html (7,140 bytes)
86. Re: Topband: Magic 'T' Combiners (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Thu, 13 Jan 2005 13:50:35 -0800 (PST); I built an 8 element vertical array a few years ago that used both in-phase and out of phase hybrid combiners built with those binocular cores. They worked perfectly, just like the textbook says. The; /archives//html/Topband/2005-01/msg00179.html (8,426 bytes)
87. RE: Topband: Magic 'T' Combiners (score: 1): Author: "Richard (Rick) Karlquist (N6RK)" <richard@karlquist.com>; Date: Fri, 14 Jan 2005 08:29:13 -0800; If, indeed, the coax lengths are equal, that is more or less true, because the mismatch will be symmetrical. For end fire arrays, the coax lengths to the front and back elements will in general be d; /archives//html/Topband/2005-01/msg00185.html (8,502 bytes)
88. Re: Topband: Another DXpedition 160 Vertical Idea (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Thu, 27 Jan 2005 17:06:22 -0800 (PST); I've seen this warning many times, but when I actually compared a half wave vertical with no radials to a quarter wave vertical with 32 radials, the difference was too close to measure (ie less than; /archives//html/Topband/2005-01/msg00307.html (7,945 bytes)
89. Re: Topband: High and low angles (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Sat, 5 Mar 2005 15:30:50 -0800 (PST); I have a very low horizon (maybe 1 or 2 degrees) but K6SE/lake nearly always beats me 1 on 1 in a pileup, with my 90 ft vertical. I am 300 miles north of the lake. Rick N6RK _________________________; /archives//html/Topband/2005-03/msg00066.html (8,170 bytes)
90. Re: Topband: RX Antenna nul discovered (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Thu, 10 Mar 2005 11:27:17 -0800 (PST); I have found that my Beverages also have severe nulls. My east beverage, which receives Herb with armchair copy, is completely deaf to Seattle; I can't even hear big guns with it. My JA beverage also; /archives//html/Topband/2005-03/msg00116.html (8,798 bytes)
91. Re: Topband: Antenna Analyzers (score: 1): Author: "Richard (Rick) Karlquist (N6RK)" <richard@karlquist.com>; Date: Thu, 31 Mar 2005 08:57:54 -0800; I wish the review had tested the "antenna" analyzers on *antennas*, not laboratory loads. All of these meters are seriously degraded by nearby broadcast stations. My MFJ-259 is useless at my QTH. The; /archives//html/Topband/2005-03/msg00281.html (7,550 bytes)
92. Re: Topband: 160 AM BCB filter (score: 1): Author: "Richard (Rick) Karlquist (N6RK)" <richard@karlquist.com>; Date: Sat, 20 Aug 2005 09:44:23 -0700; With .7 or .8 dB insertion loss, the power dissipation is something like 15%. The writeup seems to claim it can be used in the transmit path. It would get fairly warm in a contest at 150W, and proba; /archives//html/Topband/2005-08/msg00040.html (7,893 bytes)
93. Re: Topband: 160 dipole on 80 & 40 (score: 1): Author: "Richard (Rick) Karlquist (N6RK)" <richard@karlquist.com>; Date: Tue, 13 Sep 2005 08:33:26 -0700; This is because on 80m, you have a full wave dipole with many 1000's of ohms drive impedance driven through a half wave line, which puts this same impedance at the tuner. I don't know of any commerc; /archives//html/Topband/2005-09/msg00026.html (8,419 bytes)
94. Re: Topband: Tuning a 1/2 Wave Vertical for 40 Mtrs (score: 1): Author: "Richard (Rick) Karlquist (N6RK)" <richard@karlquist.com>; Date: Mon, 3 Oct 2005 19:42:17 -0700; You need about 80 pF from antenna to ground, and about 4 uH from antenna to center conductor, or vice versa. Rick N6RK _______________________________________________ Topband mailing list Topband@co; /archives//html/Topband/2005-10/msg00013.html (7,325 bytes)
95. Re: Topband: CQ WW Contest (score: 1): Author: "Richard (Rick) Karlquist (N6RK)" <richard@karlquist.com>; Date: Sun, 30 Oct 2005 14:46:21 -0800; FWIW: I worked a contest station in the Azores on Friday night and he told me my signal (from the west coast) was strong. His signal was holding its own with Caribbean stations on the east beverage.; /archives//html/Topband/2005-10/msg00334.html (7,562 bytes)
96. Re: Topband: Remote relay via single wire (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 16 Nov 2005 17:46:03 -0800 (PST); Don't they usually recommend AC, not DC, for that application? Rick N6RK _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailma; /archives//html/Topband/2005-11/msg00185.html (7,433 bytes)
97. Re: Topband: The death of 160m DX contests? (score: 1): Author: "Richard (Rick) Karlquist (N6RK)" <richard@karlquist.com>; Date: Sat, 10 Dec 2005 10:11:47 -0800; I shall continue to S & P but don't bother to In the pre-sunrise times for the Western US (from 1200-1600Z), the DX window is often nearly empty during contests. You shouldn't have any trouble callin; /archives//html/Topband/2005-12/msg00127.html (8,079 bytes)
98. Re: Topband: Stew Perry rules change (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 13 Dec 2005 16:38:02 -0800 (PST); I think this is a really great rule change. I think remote receiving sites are the wave of the future for low bands. I have been researching remote receiving sites for some time. I figured I would ei; /archives//html/Topband/2005-12/msg00197.html (8,250 bytes)
99. Re: Topband: KR1S comments -right on! (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Thu, 22 Dec 2005 19:08:34 -0800 (PST); 1. Get a linear, preferrably 1.5 kW 2. Get a rig with an effective noise blanker 3. Get a 100 Hz audio DSP filter 4. Put up a simple receiving loop and orient it to null out the noise. May or may not; /archives//html/Topband/2005-12/msg00292.html (7,844 bytes)
100. Re: Topband: New guy here. Low noise rx antenna for 1/2 acre lot? (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 4 Jan 2006 11:25:28 -0800 (PST); Generally true, but on the other hand, I frequently can hear as well or almost as well on 160m using a 40m inverted vee (basically omnidirectional) compared to a VERY directional Beverage. I am assum; /archives//html/Topband/2006-01/msg00043.html (8,821 bytes)

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