Search String: Display: Description: Sort:

Results:

References: [ +from:rudys@ordata.com: 56 ]

Total 56 documents matching your query.

21. Topband: Ferrite (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Sat, 14 Feb 2004 09:16:34 -0800
Hi Ford, Ferrite is a ceramic material. The process begins with a multi-hundred ton press for large parts. The pressed form is then fired much like pottery. The state of the art using very large pres
/archives//html/Topband/2004-02/msg00245.html (7,076 bytes)

22. Topband: Irrigation pipe verticals (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Mon, 8 Mar 2004 09:26:57 -0800
Hello, I have three 80' , 4" diameter, irrigation pipe verticals in my array. This pipe comes in two flavors: regular with 0.050"/1.3 mm wall thickness and torque-tube, with .075"/1.9 mm wall thickne
/archives//html/Topband/2004-03/msg00094.html (6,645 bytes)

23. Topband: Erecting irrigation pipe (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Wed, 10 Mar 2004 08:32:58 -0800
Jos, ON4KJ suggested the perfect solution: hire a snake charmer with a flute. Just toodle that snake right up there and tie off the guys. Next time! Regarding Dave's question on the K8UR style of arr
/archives//html/Topband/2004-03/msg00126.html (7,026 bytes)

24. Topband: 3B9C (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Thu, 25 Mar 2004 06:35:27 -0800
3B9C came out of the noise here in Orygun at 1402, peaked at 549 and went back into the noise by 1404. We may just be able to work him from the NW. XX9, BV, JA, etc were very good this morning. 73, R
/archives//html/Topband/2004-03/msg00254.html (7,681 bytes)

25. Topband: Rx antennas (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Tue, 18 May 2004 13:25:25 -0700
As weak signal junkies, topbanders have a very practical interest in the performance differences between different antenna options and this subject certainly merits extensive discussion. Obviously th
/archives//html/Topband/2004-05/msg00050.html (9,170 bytes)

26. Topband: Rx antennas (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Wed, 19 May 2004 11:17:00 -0700
Mike Tope's comment this morning is dead on. After thinking a bit about this last night I came to the same conclusion. The near field characteristics of the receiving antenna when transmitting are no
/archives//html/Topband/2004-05/msg00053.html (9,342 bytes)

27. Topband: Rx antennas (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Fri, 21 May 2004 11:42:19 -0700
Here is a little more anecdotal rx antenna info. Some years back I stretched out a 950' Beverage, running E-W up a 20 degree slope, using RG6 cable and a transformer at the far end to switch directio
/archives//html/Topband/2004-05/msg00064.html (10,502 bytes)

28. Topband: Beverage array interaction (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Sat, 22 May 2004 11:53:58 -0700
Jim is right on the mark. Because my 160 m antennas are confined in-line on a very narrow ridge I have lots of interaction problems between the Beverage and the main array. The Beverage begins about
/archives//html/Topband/2004-05/msg00068.html (7,667 bytes)

29. Topband: diversity reception (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Sun, 23 May 2004 09:34:37 -0700
For those who have access to a library which has the IRE proceedings (an engineering college library for example) there are three classic papers on diversity that are very informative and quite easy
/archives//html/Topband/2004-05/msg00076.html (7,336 bytes)

30. Topband: diversity reception (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Sun, 23 May 2004 09:48:26 -0700
Because many of you may not have access to the IRE proceedings here is a brief excerpt you may find helpful. "Developments at this stage of the program indicate that it may be possible to establish q
/archives//html/Topband/2004-05/msg00077.html (6,901 bytes)

31. Topband: diversity rx (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Mon, 24 May 2004 10:18:41 -0700
I read the great article on the Hallicrafters DD-1 diversity receiver. Apparently they did not have agc systems fast enough to respond to CW and they had to do some strange stuff to get CW diversity
/archives//html/Topband/2004-05/msg00085.html (7,295 bytes)

32. Topband: Beverage with coax (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Thu, 22 Jul 2004 10:33:09 -0700
Several years ago I put out a 900' Beverage using RG6 which is relatively cheap here since it's widely used for TV. There is a reflection transformer and ground stake at the far end. The antenna runs
/archives//html/Topband/2004-07/msg00043.html (7,170 bytes)

33. Topband: HS72B in Oregon (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Thu, 9 Dec 2004 09:45:12 -0800
In central Oregon, HS72B popped out of the noise at 1520Z and faded back at 1525Z. Clearly readable but not very strong. 73, Rudy N6LF _______________________________________________ Topband mailing
/archives//html/Topband/2004-12/msg00152.html (6,199 bytes)

34. Topband: HS72B (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Fri, 10 Dec 2004 08:45:57 -0800
Robin had a great signal in central Oregon this morning. 579 from 1520 through 1550. Still audible at 1600. Very frustrating!! 73, Rudy N6LF _______________________________________________ Topband ma
/archives//html/Topband/2004-12/msg00160.html (7,714 bytes)

35. Topband: -77 ferrites (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Mon, 27 Dec 2004 10:09:33 -0800
Mike Tope's measurements are exactly what you would expect for a manganese-zinc ferrite. If you take a look at the complex permeability versus frequency graph for this or similar MnZn ferrites you wi
/archives//html/Topband/2004-12/msg00319.html (7,843 bytes)

36. Topband: -77 material (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Mon, 27 Dec 2004 10:21:11 -0800
Gary's graphs perfectly illustrate my point. This is the general behavior you would expect from MnZn ferrites. 73, Rudy N6LF _______________________________________________ Topband mailing list Topba
/archives//html/Topband/2004-12/msg00320.html (6,159 bytes)

37. Topband: Last night (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Fri, 7 Jan 2005 08:43:01 -0800
Last night was great in the PacNW. I worked nine Europeans and George, W2VJN worked about the same number but when we compared notes there was some overlap but some differences. It appears that at le
/archives//html/Topband/2005-01/msg00094.html (6,661 bytes)

38. Topband: Whoops! (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Fri, 7 Jan 2005 11:15:33 -0800
Lets try 0200Z for the early EU QSO!! 73, Rudy N6LF _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailman/listinfo/topband
/archives//html/Topband/2005-01/msg00100.html (6,070 bytes)

39. Topband: last night in NW (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Thu, 20 Jan 2005 09:18:09 -0800
Ha ha, Tree's note on last night is a good example of how little we understand ionospheric forecasts and 160 m propagation. I took a look at the WWV conditions, high flux, high A, high K and storm co
/archives//html/Topband/2005-01/msg00264.html (6,483 bytes)

40. Topband: Signal directions (score: 1)
Author: "Rudy Severns" <rudys@ordata.com>
Date: Mon, 24 Oct 2005 11:27:31 -0700
The signal arrival azimuths from Europe have changed drastically from earlier years at my QTH. In past years both a Beverage and a 3-element in-line array pointed at 106 degrees (T) were quite able t
/archives//html/Topband/2005-10/msg00265.html (6,833 bytes)

Current List: 21 - 40
Page: [1] [2] [3]
This search system is powered by Namazu