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61. Re: Topband: Inverted L Dimensions (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Wed, 29 Sep 2010 10:08:16 -0500
No, I didn't say that. I said it is very difficult to accurately calculate the gain of an inverted L. Jerry, K4SAV _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw?
/archives//html/Topband/2010-09/msg00106.html (8,964 bytes)

62. Re: Topband: Inverted L Dimensions (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Thu, 30 Sep 2010 23:36:03 -0500
K2AV: "Ground resistance is a CONSTANT in a given setting, the same as an ordinary resistor. IT DOES NOT VARY depending on induced current short of loss heat converting ground moisture to steam or en
/archives//html/Topband/2010-10/msg00002.html (10,459 bytes)

63. Re: Topband: Some confusion regarding EZNEC results on horizontal loops (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Thu, 23 Dec 2010 21:46:37 -0600
The actual performance should be very close to that predicted when using the real ground. The reason you get a wrong answer using the Mininec ground is because you violated one of the rules for use o
/archives//html/Topband/2010-12/msg00099.html (8,643 bytes)

64. Re: Topband: Need EZNEC file for 1/4 wave 160 vertical with radial system (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Thu, 10 Mar 2011 12:15:45 -0600
W0BTU wrote: " The low dipole should be inferior to a 1/4 wave vertical at a 25 degree elevation, but my models do not show that, by any means." You probably are using a Mininec ground under the dipo
/archives//html/Topband/2011-03/msg00040.html (7,322 bytes)

65. Re: Topband: Tower Shunt Feed (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Mon, 04 Apr 2011 10:07:17 -0500
K3BZ wrote: "I want to put the feed caps in a plastic box at the 4' level so the shunt won't interfere with tilting the tower over. The tower grounds and the radial system would connect at ground lev
/archives//html/Topband/2011-04/msg00014.html (9,133 bytes)

66. Re: Topband: New entry to TopBand with antenna question (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Mon, 05 Sep 2011 18:07:53 -0500
DXCC on 160 in two years from 9 land isn't an unreasonable goal. Start with one the 160 meter contests and that should start you off with about 40-60 if you look for the DX stations. At the end of on
/archives//html/Topband/2011-09/msg00029.html (8,917 bytes)

67. Re: Topband: Noise problem question (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Thu, 22 Dec 2011 08:59:22 -0600
This is a very useful device at pinpointing a problem. If the noise source is not very close to you, a radio of some kind will be needed to get somewhere close to the source. When in the area, a chec
/archives//html/Topband/2011-12/msg00520.html (10,849 bytes)

68. Re: Topband: 9M0L (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Tue, 17 Apr 2012 12:38:54 -0500
If you look at the map you will discover there are no times of common darkness between 9M0 and the Virgin Islands. There isn't even any common darkness hours between Alabama and 9M0, although there i
/archives//html/Topband/2012-04/msg00124.html (7,251 bytes)

69. Re: Topband: "return" current - what is it? (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sat, 04 Aug 2012 10:04:00 -0500
You are misinterpreting what you are seeing. When you put a resistor in one side of a dipole you modify the current distribution in both sides of the dipole and the side with the resistor has a large
/archives//html/Topband/2012-08/msg00079.html (8,684 bytes)

70. Re: Topband: "return" current - what is it? (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sat, 04 Aug 2012 13:58:28 -0500
Yes current on each side of the feedpoint is always the same but you can't see that with an NEC measurement because you are always measuring one segment away from the feedpoint and when the current d
/archives//html/Topband/2012-08/msg00092.html (7,993 bytes)

71. Re: Topband: "return" current - what is it? (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sat, 04 Aug 2012 22:06:59 -0500
I forgot about the SI source. That will effectively place the source at a segment junction. Actually it places two sources in the middle of two adjacent segments and that simulates almost the same th
/archives//html/Topband/2012-08/msg00101.html (9,683 bytes)

72. Re: Topband: dipole height (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Wed, 31 Oct 2012 09:38:23 -0500
James Wolf wrote: In general, this is the case, but it is not always true. Consider that you can have an antenna with a high RDF number, but at the same time has a pattern where rear lobe positions f
/archives//html/Topband/2012-10/msg00388.html (9,566 bytes)

73. Re: Topband: dipole height (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Wed, 31 Oct 2012 09:52:20 -0500
Sorry, I gave the number for a 1/2 wavelength Beverage not a one wavelength. The one wavelength Beverage is 8.6 dB and the 1/2 wavelength Beverage is 7.9 dB. Jerry, K4SAV ___________________________
/archives//html/Topband/2012-10/msg00389.html (8,268 bytes)

74. Re: Topband: dipole height (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Wed, 31 Oct 2012 10:32:08 -0500
I guess it's too early in the morning. I also misquoted the 1/2 wavelength Beverage RDF number. W8JI has a table with RDF numbers here: http://www.w8ji.com/receiving.htm Another example of surprising
/archives//html/Topband/2012-10/msg00391.html (8,452 bytes)

75. Re: Topband: Outing The Scofflaws... (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Tue, 13 Nov 2012 08:09:57 -0600
The thing I find amazing is the number of people that send on top of the station that the DX is trying to work. For the past two nights while listening to PT0S and listening for the frequency of the
/archives//html/Topband/2012-11/msg00169.html (9,851 bytes)

76. Re: Topband: Steady Carrier on 80 CW (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Fri, 01 Nov 2013 21:58:28 -0500
The signals on 3501.6 and 3503.1 are both SE of me (north Alabama) but I can't locate the direction any closer than that with only a four direction receiving antenna. They are very strong, S9+5 to S9
/archives//html/Topband/2013-11/msg00048.html (8,370 bytes)

77. Re: Topband: Steady Carrier on 80 CW (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sat, 02 Nov 2013 09:52:45 -0500
I think I can do a little better on estimating the direction (better than SE which I gave earlier). I can get two 30 dB nulls out of my receiving antenna by switching directions. Those nulls appear a
/archives//html/Topband/2013-11/msg00056.html (9,708 bytes)

78. Re: Topband: Steady Carrier on 80 CW (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sat, 02 Nov 2013 12:12:20 -0500
The signal on 3501.6 seems to have some significant power behind it. At noon (1700 UTC) it is running S7 to S1 (QSB) on my vertical. There is also an unmodulated carrier on 10.5048 MHz, but not very
/archives//html/Topband/2013-11/msg00060.html (10,143 bytes)

79. Re: Topband: Steady Carrier on 80 CW (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sat, 02 Nov 2013 19:23:50 -0500
Well darn. The signal on 3501.6 stopped at 2301 UTC. I thought maybe it would have some RTTY when it came back on like it did last time (maybe with a station ID), so I recorded it. It didn't. It just
/archives//html/Topband/2013-11/msg00062.html (9,324 bytes)

80. Re: Topband: Steady Carrier on 80 CW (score: 1)
Author: K4SAV <RadioIR@charter.net>
Date: Sat, 02 Nov 2013 19:46:34 -0500
For anyone doing plots, I'm at 3433'49.68"N, 8655'4.83"W Plug that into Google Earth's "fly-to" box and you can see my house, if you like. Jerry It's at S9+10 on my vertical. Tom thanks for the mea
/archives//html/Topband/2013-11/msg00063.html (9,539 bytes)


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