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Total 263 documents matching your query.

81. Topband: DX-Enginneering Active Antenna System (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Fri, 2 Oct 2009 10:26:10 -0700
Yes, the time delay phasing (crossfire) has been disclosed for a very long time on Toms website. There is more than one way to accomplish phase tracking with a 4 element array. I cite Rick N6RK and h
/archives//html/Topband/2009-10/msg00037.html (8,448 bytes)

82. Topband: Efficiency (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Tue, 3 Nov 2009 23:30:11 -0800
I just spent a few fruitless moments trying to work an OZ1 that couldn't hear me at 1500 Watts. I thought of Lew W7EW. While the expenditure of effort on receiving antennas is generally well spent, s
/archives//html/Topband/2009-11/msg00102.html (8,083 bytes)

83. Topband: insulated vs:bare radial wires (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Fri, 4 Dec 2009 16:46:39 -0800
It seems to me that if radial wires are required to carry the antennas return RF current we might be concerned about the skin depth of the radial conductors. It also seems to me that if we can keep t
/archives//html/Topband/2009-12/msg00053.html (8,833 bytes)

84. Topband: Receiving array (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sun, 20 Dec 2009 21:22:08 -0800
I have posted a new design for a three element shortened vertical receiving array on my website. It uses the high impedance amplifiers for each element. It can be made to work with a very small footp
/archives//html/Topband/2009-12/msg00229.html (6,788 bytes)

85. Topband: 160M LDE (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Wed, 20 Jan 2010 21:06:10 -0800
Yes, I have heard short time delay echoes many times. One significant memory is during one of the times when the echo was very prominent I had a local call me and ask me to check my transmitter as he
/archives//html/Topband/2010-01/msg00171.html (7,132 bytes)

86. Topband: AM BCB noise in Portland, OR (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Tue, 26 Jan 2010 11:11:28 -0800
Tree said>I do have a big AM station about 3 miles west of me (KXL - 20 KW at night) and I drove over there and determined it was not that station. From that QTH - I got a good bearing on the signal
/archives//html/Topband/2010-01/msg00210.html (7,512 bytes)

87. Topband: Birdies (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Tue, 23 Feb 2010 14:58:11 -0800
The subject of birdies on top-band is a lot more complex than it may seem on the surface. The ones most often seen in the US of course are the BC birdies on 1810, 20, 30, etc. These can come from mul
/archives//html/Topband/2010-02/msg00191.html (8,913 bytes)

88. Topband: grounded tower detuning (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Wed, 3 Mar 2010 21:55:28 -0800
Hi Gary. Although I have not had the opportunity to implement a tower detuning, I have given it a bit of thought and wonder if this idea would work. You say you already have a Gamma rod which makes m
/archives//html/Topband/2010-03/msg00019.html (7,262 bytes)

89. Topband: (HWF) Horizontal Waller Flag ; one year report, (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Fri, 2 Apr 2010 09:48:55 -0700
Jose Carlos says. No preamps RX open, no antenna - 124 dBm 50 ohms load - 124 dBm RX plus 3 Norton preamps RX + 2 Norton, no antenna -119 dBm 50 ohms load -115 dBm HWF connected -113 dBm VWF connecte
/archives//html/Topband/2010-04/msg00014.html (8,664 bytes)

90. Topband: (HWF) Horizontal Waller Flag ; one year report, (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sat, 3 Apr 2010 10:25:00 -0700
I must confess, my curiosity got the best of me from Jose Carlos' measurements. The question however still remains. I wonder what the NF of a Norton amp does with real other impedances than the regul
/archives//html/Topband/2010-04/msg00020.html (7,881 bytes)

91. Topband: your opinions (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sun, 18 Jul 2010 19:45:13 -0700
<If you had 20,000 acres of clear, level land available and a couple of thousand dollars to spend from selling some old equipment, what type of 160 meter receiving antennas would you build? 73 Larry
/archives//html/Topband/2010-07/msg00093.html (8,427 bytes)

92. Topband: Beverages long (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Wed, 28 Jul 2010 21:21:41 -0700
As Joel says it is indeed exciting to go into another season on 160 meters. In regard to portable antennas I must comment that one soon tires of laying out radials for temporary antennas. I have been
/archives//html/Topband/2010-07/msg00119.html (9,970 bytes)

93. Topband: Better F Connectors (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Mon, 31 Jan 2011 20:07:38 -0800
Chassis mount F connectors look good to me. Mouser 601-25-7660 Lee K7TJR OR _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
/archives//html/Topband/2011-02/msg00000.html (6,079 bytes)

94. Topband: Switching Beverages (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Tue, 1 Feb 2011 18:42:28 -0800
Pete, here is my take on switching Beverages, It is a lot harder to make a switch with very good isolation at 500 ohms than it is at 50 or 75 ohms. You need very good isolation between connections so
/archives//html/Topband/2011-02/msg00011.html (7,611 bytes)

95. Topband: TDR and beverages (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sun, 15 May 2011 15:46:32 -0700
The Tek 465 and many other scope models can be used as a TDR without building any circuitry. One simply needs to take the A gate signal out of the rear panel of the scope and connect it in parallel w
/archives//html/Topband/2011-05/msg00041.html (7,183 bytes)

96. Topband: Ionization before Japan's seismic event (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Wed, 18 May 2011 23:04:20 -0700
How fascinating this article crosses my vision on the 31st anniversary of the Mt St Helens Eruption. Also how fascinating to me there may be a connection to radioactive radon gas. Having worked in th
/archives//html/Topband/2011-05/msg00058.html (8,423 bytes)

97. Topband: 180deg phase inverter? Very Long! (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Fri, 21 Oct 2011 01:27:37 -0700
Dave and the gang. You have asked for a tall order in understanding the 180 degree phase inverter added to a transmission line. For the folks that have ever messed with Eznec they have likely program
/archives//html/Topband/2011-10/msg00174.html (9,961 bytes)

98. Topband: Antennas (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sun, 20 Nov 2011 10:46:18 -0800
Wow, I thought this reflector was for topics pertaining to Top-Band. I for one have enjoyed the lively exchange of ideas and views in the recent radial exchange. I do believe that something was gaine
/archives//html/Topband/2011-11/msg00172.html (6,892 bytes)

99. Topband: Daisey Chained ground rods (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sun, 20 Nov 2011 12:02:26 -0800
It seems to me what your asking here is how much crosstalk you would see between two Beverage antennas. How about just using a signal source and exciting one beverage while listening on the other. Th
/archives//html/Topband/2011-11/msg00175.html (8,219 bytes)

100. Topband: BCI chase update (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sun, 8 Jan 2012 13:46:00 -0800
Paul you might want to be careful just shorting the receiver input. This would also put a short on the output of your preamp. This would have the preamp blasted with RF from your TX while trying to f
/archives//html/Topband/2012-01/msg00128.html (6,775 bytes)

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