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41. RE: Topband: measuring transformer core inductance (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Mon, 17 Nov 2003 08:22:27 -0800; The very popular Fair-Rite 43 is not immune from magnetization, as I have tested it. I suspect 73 is at least as bad. The issue comes up for me because I use DC in my system to switch relays. If the; /archives//html/Topband/2003-11/msg00118.html (8,664 bytes)
42. RE: Topband: measuring transformer core inductance (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 17 Nov 2003 11:19:35 -0800 (PST); This is referred to as a common mode choke. Differential (odd) mode current would not affect the core. Common (even) mode current would be able to affect the core if of sufficient magnitude. In any e; /archives//html/Topband/2003-11/msg00120.html (8,748 bytes)
43. RE: Topband: Cores and switches (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Tue, 18 Nov 2003 07:53:56 -0800; In a contest, I am madly trying different beverages when being called by a station in an unknown direction. This is easier to do with conventional relays. Rick N6RK _________________________________; /archives//html/Topband/2003-11/msg00129.html (8,120 bytes)
44. Re: Topband: Remote coax switching (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 19 Nov 2003 18:47:55 -0800 (PST); What I have is boards with window comparators that detect if the voltage is in a particular 4 volt voltage band, and if so, activate the right relay. I have a 12 position rotary switch that puts out; /archives//html/Topband/2003-11/msg00153.html (7,894 bytes)
45. RE: Topband: remote coax switching (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Thu, 20 Nov 2003 08:12:10 -0800; If you don't mind replacing a lightning damaged part now and My name is Rick, not Karl. Anyway, we basically don't get lightning in Galt, so I don't worry about it for the Beverages. They are far mor; /archives//html/Topband/2003-11/msg00159.html (8,597 bytes)
46. RE: Topband: 160m Receive Antenna (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Sun, 7 Dec 2003 21:29:09 -0800; I use 400 ft long beverages. They work as well as longer ones at my QTH. In any case, short beverages are better than no beverages. I think you can fit 400 ft beverages on 4 acres, at least at some; /archives//html/Topband/2003-12/msg00047.html (8,030 bytes)
47. RE: Topband: Conditions in ARRL 160 Contest (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Sun, 7 Dec 2003 21:29:08 -0800; N4PN was unbelievable here too. He was the first east coast station heard as the sun went down. Consistently strong signals. We gotta find out what his secret weapon is. Rick N6RK __________________; /archives//html/Topband/2003-12/msg00048.html (8,035 bytes)
48. Topband: FT1000D APF mod experience. (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Sun, 7 Dec 2003 21:29:11 -0800; I just finishing operating in the ARRL 160 meter contest with my FT1000D. I have 250 Hz and 500 Hz INRAD filters in the 455 kHz IF, and Yaesu 250 and 500 Hz filters in the 8 MHz. IF. I also have the; /archives//html/Topband/2003-12/msg00049.html (7,542 bytes)
49. RE: Topband: Listening (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Mon, 8 Dec 2003 19:20:06 -0800; I ran into this problem as well. In fact, I reduced the number of beverages from 12 to 6 because of this problem. My east beverage is totally deaf to the north to Oregon and Washington. It also help; /archives//html/Topband/2003-12/msg00072.html (7,505 bytes)
50. Re: Topband: Mobile on 160 (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 10 Dec 2003 12:10:10 -0800 (PST); I bought the High-Q (W6HIQ) 4-160 antenna specifically with the idea in mind of getting on 160. But then I found that it barely gets down to 2 MHz with a CB whip. The vendor suggests adding a 1 foot; /archives//html/Topband/2003-12/msg00096.html (7,477 bytes)
51. RE: Topband: TOPBAND : Antenna reception 160/80 ? (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Thu, 25 Dec 2003 09:57:22 -0800; I put up 30m and 40m inverted vee's on a 60 foot (18 meter) mast. They are at right angles on a common feed line. Believe it or not, these make great receive antennas on 80 and 160. In terms of signa; /archives//html/Topband/2003-12/msg00215.html (9,202 bytes)
52. RE: Topband: Beverages over Radials (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Wed, 7 Jan 2004 08:26:32 -0800; Last year, I followed the directions on Tom's web site and built some receiving arrays. They worked just like he said they would and were equal to better than my 500 ft beverages. I should mention t; /archives//html/Topband/2004-01/msg00083.html (8,881 bytes)
53. RE: Topband: Keying waveform (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Tue, 27 Jan 2004 07:01:32 -0800; Just wanted to point out that filtering a square wave through a brick wall low pass filter results in a pulse that has both preringing and postringing in the time domain. This has narrower bandwidth; /archives//html/Topband/2004-01/msg00264.html (8,175 bytes)
54. RE: Topband: dynamic range (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Thu, 5 Feb 2004 21:57:16 -0800; Any decent signal generator will have a built in output attenuator providing a good 50 ohm source impedance. You shouldn't need to pad the output externally. The mismatch error due to the receiver i; /archives//html/Topband/2004-02/msg00098.html (9,238 bytes)
55. Re: Topband: Input Impedance of the FT1000/S-Meter Calibration issues (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Mon, 9 Feb 2004 14:44:20 -0800 (PST); There is not 10-20 dB of variation in the S-meter. The worst case mismatch you show is 10+j16. Even this 5:1 SWR only results in a 3 dB mismatch loss, still not much in the overall scheme of things.; /archives//html/Topband/2004-02/msg00135.html (8,191 bytes)
56. RE: Topband: Input Impedance of the FT1000/S-Meter Calibration issues (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Wed, 11 Feb 2004 07:37:14 -0800; In fact, it can be shown that optimum noise figure NEVER coincides with a matched condition for bipolar transistors. The ratio of input impedance to source impedance must be approximately equal to t; /archives//html/Topband/2004-02/msg00163.html (9,178 bytes)
57. RE: Topband: S-meter Calibration (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Thu, 12 Feb 2004 08:26:38 -0800; What I do when giving signal reports on 160 is to switch the receiver to listen on the transmit antenna (a 90 foot vertical) and get an S-meter reading on the FT-1000D. I then use a lookup table to; /archives//html/Topband/2004-02/msg00184.html (8,281 bytes)
58. RE: Topband: Vertical again (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Fri, 13 Feb 2004 18:56:38 -0800; I used to have a vacuum relay at the 60 foot point on my 90 foot vertical. I would open it up for 80 meters. Now what I do is just feed all 90 ft on 80 meters using an L network to step up 50 ohms t; /archives//html/Topband/2004-02/msg00236.html (8,161 bytes)
59. Re: Topband: WA0RCR Questioned (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 10 Mar 2004 18:13:45 -0800 (PST); I can just barely copy this "broadcast" from my QTH on the West coast, using a beverage. How well do other west coast'ers copy it? I use it as a beacon to test receive antennas. IMHO, the frequency o; /archives//html/Topband/2004-03/msg00143.html (8,751 bytes)
60. RE: Topband: Erecting irrigation pipe (score: 1): Author: "Richard Karlquist" <richard@karlquist.com>; Date: Thu, 11 Mar 2004 08:21:42 -0800; For my 60 foot (3 inch diameter) verticals, I use a 30 foot piece of 2 inch irrigation tubing as a gin pole. It's a cinch to raise and lower it by hand. The 90 foot verticals require more sophistica; /archives//html/Topband/2004-03/msg00151.html (7,925 bytes)

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