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61. Re: Topband: Need help in winning a Preamp Wager (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 25 Feb 2005 22:03:06 -0600
Gee, I hadn't thought of a feedline that long! With that much loss, I would certainly agree -- IF I was in a relatively quiet RF environment. :) On the other hand, 11 dB seems high for that length of
/archives//html/Topband/2005-02/msg00238.html (7,324 bytes)

62. Re: Topband: PJ2 (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 08 Mar 2005 22:33:36 -0600
As you probably know, he was operating the PJ2T station. I just heard/saw a nice presentation by W9VA and W9JUV at our local ham club an hour ago! I asked about topband antennas and got vague answers
/archives//html/Topband/2005-03/msg00097.html (7,429 bytes)

63. Re: Topband: Turning a 160 Inv-L into a 160/80 Inv-L (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 12 Apr 2005 16:41:16 -0500
Have you tried loading it on 80 as is? My top-loaded end-fed wire (really an 80/40 dipole with both sides of the feedline tied together) works VERY well on 80 with nothing more than my Ten Tec tuner.
/archives//html/Topband/2005-04/msg00111.html (7,483 bytes)

64. [TowerTalk] OT: Longwave Broadcast In Europe (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 21 Apr 2005 09:43:55 -0500
For some AES (Audio Engineering Society) standards work I am doing (on EMC), I need to get a handle on the approximate field strengths used by long wave broadcast stations (150-250 kHz) in Europe and
/archives//html/Topband/2005-04/msg00141.html (7,394 bytes)

65. [TowerTalk] Long Wave Transmitters (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 24 Apr 2005 06:38:06 -0500
Many thanks to all who responded to my query on this topic. Several asked that I forward a summary of the replies to the list, so here goes. There is a quite detailed description of the WWVB 60 kHz t
/archives//html/Topband/2005-04/msg00146.html (10,839 bytes)

66. [TowerTalk] Al Kahn, K4FW, Silent Key (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 16 Jun 2005 11:46:32 -0500
Reprinted from the North Shore Radio Club EMail List. Jim Brown = = = = = = = = = = K4FW, Albert R. Kahn, passed away on June 15th. Al started Ten-Tec after being bored with retired life. He was also
/archives//html/Topband/2005-06/msg00021.html (8,220 bytes)

67. Topband: Field Day (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 23 Jun 2005 11:46:26 -0500
Another show of hands -- who's planning to be on 160 for Field Day? Jim K9YC _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/ma
/archives//html/Topband/2005-06/msg00032.html (6,122 bytes)

68. Re: Topband: Ferrite Rods for Common mode choke? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 31 Aug 2005 17:19:44 -0500
Depending on the material and the frequency you need to suppress, it may be possible to use the parts you have effectively. See my applications note on this topic on my website, then try to find data
/archives//html/Topband/2005-09/msg00000.html (6,840 bytes)

69. Re: Topband: R.F.I. REPORT (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 15 Oct 2005 18:48:49 -0500
Exactly which beads did you use? (manufacturer and part number) There are two detailed applications notes on my website, with lots of measured data that you may find helpful. http://audiosystemsgroup
/archives//html/Topband/2005-10/msg00102.html (7,029 bytes)

70. Re: Topband: cluster-QSOs Y or N ? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 12 Nov 2005 16:10:11 -0600
It depends entirely on how the operators involved handle the information. I can hear almost none of the 160m cluster spots, thanks to lots of receive noise. In fact, I read the cluster mostly so that
/archives//html/Topband/2005-11/msg00111.html (8,433 bytes)

71. Re: Topband: FairRite Products 2873000202 (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 04 Feb 2006 14:53:31 -0600
But it does seem that reasonably careful winding with decent enameled wire should not be a problem. But I have another question for you, Tom. #73 is pretty lossy, whereas #43 is a lot less so. It isn
/archives//html/Topband/2006-02/msg00081.html (7,880 bytes)

72. Re: Topband: RG-6 Coaxial Cable... (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 14 Sep 2006 10:32:02 -0700
Many thanks for this detailed post. I have exactly that application here. Does this comment apply to a cable like Commscope 5781 (#18 copper center. foam PE, w/quad shield -- AL foil, 60% AL braid, A
/archives//html/Topband/2006-09/msg00048.html (8,679 bytes)

73. Re: Topband: RG-6 Coaxial Cable... (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 15 Sep 2006 17:22:18 -0700
First, the nominal resonant Z of a dipole in free space is much closer to 75 ohms than 50 ohms. As a dipole gets closer to earth, its impedance tends to get lower, thanks to coupling to the earth. Th
/archives//html/Topband/2006-09/msg00061.html (9,817 bytes)

74. Topband: New Antenna, Need Reports (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 15 Sep 2006 17:31:34 -0700
Hi Gang, I've got a new top-loaded vertical, with radials, up for topband, and would like some reports comparing it to my existing dipole. If you hear me on, please call. 73, Jim Brown K9YC _________
/archives//html/Topband/2006-09/msg00062.html (6,373 bytes)

75. Topband: New Antenna, Need Advice (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 17 Sep 2006 08:07:24 -0700
I've successfully moved my top-loaded vertical from Chicago to Santa Cruz. http://audiosystemsgroup.com/K9YC/k9yc160TopLoad.htm The vertical is really an 80/40 dipole with loading coils to make it re
/archives//html/Topband/2006-09/msg00066.html (8,145 bytes)

76. Re: Topband: Topband Digest, Vol 45, Issue 17 (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 18 Sep 2006 13:27:49 -0700
Yes, after I posted the question, I went "into the woodshed" -- looking through ON4UN's book and the Antenna Book, and found exactly that suggestion for a very similar configuration. So I built it up
/archives//html/Topband/2006-09/msg00071.html (8,438 bytes)

77. Re: Topband: New Antenna, Need Advice (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 19 Sep 2006 16:09:58 -0700
You were right, John. Garry, NI6T was also correct that the small coil I was using had too low a Q and that I was tapped too low on it. I replaced it with a high power roller inductor, about 9 uH, a
/archives//html/Topband/2006-09/msg00076.html (7,214 bytes)

78. Topband: Beverages in Rugged Terrain (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 22 Sep 2006 16:15:44 -0700
My new QTH is 8.5 acres in a mountainous area. I'm at 2,000 ft, with a 200 ft ridge above me beginning a bit west of north (i.e., about 330 degrees) and continuing to about 160 degrees) (on the order
/archives//html/Topband/2006-09/msg00084.html (7,197 bytes)

79. Re: Topband: Broadcast Radio?? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 25 Sep 2006 09:20:03 -0700
It's quite common to hear intermod from broadcast stations on multiples of 10 kHz. This CAN occur within the transmitter of one of the stations, but also within some non-linear detector near you (or
/archives//html/Topband/2006-09/msg00106.html (7,287 bytes)

80. Re: Topband: Beverages in Rugged Terrain (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 25 Sep 2006 20:03:37 -0700
Thanks for all the advice. I'm working on it! 73, Jim K9YC _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailman/listinfo/top
/archives//html/Topband/2006-09/msg00110.html (7,007 bytes)

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