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81. Re: Topband: AutoEZ (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 21 Sep 2013 06:35:34 -0400; 4Nec2 supports current sources, as well as surface/ground wave modeling -- as has been discussed here in past weeks and should be of importance to topbanders. It may be worth having a look at the mos; /archives//html/Topband/2013-09/msg00301.html (8,688 bytes)
82. Re: Topband: Best Outlet sttrip (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 9 Oct 2013 09:55:52 -0400; I'm afraid I don't understand how a surge protector that clips an, e.g., 1KV spike on a 120 VAC line can end up doing more damage than no protection all. I understand that the clipped current pulse r; /archives//html/Topband/2013-10/msg00074.html (11,752 bytes)
83. Re: Topband: Best Outlet sttrip (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 9 Oct 2013 10:02:35 -0400; "First, in most NA power systems, neutral and ground are connected at only two places: (1) the secondary of the utility company's transformer; and (2) at the premises main panel board." Sorry, should; /archives//html/Topband/2013-10/msg00075.html (12,995 bytes)
84. Re: Topband: Best Outlet sttrip (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 9 Oct 2013 16:08:16 -0400; Tom, You have probably already seen references like this: http://www.zerosurge.com/technical-info/how-surge-suppression-works/ One can either believe it, or dismiss it as voodoo engineering. I'll not; /archives//html/Topband/2013-10/msg00077.html (14,285 bytes)
85. Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 17 Oct 2013 08:31:23 -0400; *L network tuners (like the Ten-Tec, Nye Viking, etc) handle more* *power into impedances near 50 ohms, but often do a poor job * *matching reactive or very low impedance loads on low frequencies. Th; /archives//html/Topband/2013-10/msg00103.html (12,277 bytes)
86. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 17 Oct 2013 11:05:51 -0400; The advice I would give anyone is pretty simple. Don't design or use an antenna that has extremely low or reactive feed impedances, unless you have no other choice. If you must use one, plan on low e; /archives//html/Topband/2013-10/msg00106.html (11,130 bytes)
87. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 17 Oct 2013 11:18:02 -0400; So what different bout your tuner, is it like the ATR-10 design? Nothing special. It's just a symmetrical balanced tuner with a pair of synchronized roller inductors and a large vacuum variable cap (; /archives//html/Topband/2013-10/msg00107.html (9,908 bytes)
88. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 19 Oct 2013 11:44:22 -0400; "These transmatches these days T matches just do not have the balls for 160M running power." They do if the tuner's complex load Z is reasonable.> "I melted down a MFJ 998RT arced plates on an MFJ 98; /archives//html/Topband/2013-10/msg00134.html (9,847 bytes)
89. Re: Topband: W8ji ATR-10 design 160M? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 19 Oct 2013 11:52:06 -0400; Not sure what happened to the text formatting but let's try this again... "These transmatches these days T matches just do not have the balls for 160M running power." They do if the tuner's complex l; /archives//html/Topband/2013-10/msg00135.html (12,323 bytes)
90. Re: Topband: Antenna switch rating for high SWR? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 20 Oct 2013 12:46:12 -0400; Ditto on that series Tyco relays. I used them about 15 years ago when switching line lengths on the W5DXP "No Tuner All Band Antenna." That antenna requires five relays to stretch open-feeder line le; /archives//html/Topband/2013-10/msg00165.html (9,508 bytes)
91. Re: Topband: Steady Carrier on 80 CW (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 8 Nov 2013 08:33:35 -0500; It is built around the DDS VFO kit sold by N3ZI and amplifier kit from W8DIZ. Power is 1 W to a 43 foot vertical." If the QRSS station is operated at the FCC-licensed address, that places his QTH on; /archives//html/Topband/2013-11/msg00137.html (8,819 bytes)
92. Re: Topband: Local noise source identification (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 9 Nov 2013 17:33:31 -0500; I shut down all of the circuits in my house other than my shack and it did not disappear. Has anyone experienced something similar? Constantly. You took the right first step and determined that the n; /archives//html/Topband/2013-11/msg00142.html (8,118 bytes)
93. Re: Topband: The guy who Sells AIM Products Responds (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 25 Feb 2014 15:07:34 -0500; Depends on the claim(s) in question which may affect the novelty of the software or a process more than the VNA hardware. Also, I believe W5BIG has both a two-port VNA in addition to the single-port; /archives//html/Topband/2014-02/msg00450.html (10,122 bytes)
94. Re: Topband: New MFJ 259C available (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 4 Mar 2014 10:25:22 -0500; I had a look at the matching Rosenberger calibration standards and for the money, the kit is a bargain. At first, I was disappointed to see what amounts to only 1% resistive load accuracy. The displa; /archives//html/Topband/2014-03/msg00030.html (9,630 bytes)
95. Re: Topband: New MFJ 259C available (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 5 Mar 2014 08:31:39 -0500; "As I looked at things over the years, very few people want VNA's that attach to PC's, and that market is covered anyway. I thought a 259 revision wth direct conversion receivers and a wide frequency; /archives//html/Topband/2014-03/msg00058.html (11,012 bytes)
96. Re: Topband: New MFJ 259C available (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 5 Mar 2014 10:15:56 -0500; +13 dBm is nothing. That is only 20 milliwatts or 1 volt across 50 ohms if that is at 50 ohms. +13 dBm may be more than adequate depending on that unit's (AA-54) selectivity. I would like to see it's; /archives//html/Topband/2014-03/msg00061.html (10,719 bytes)
97. Re: Topband: New MFJ 259C available (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 5 Mar 2014 14:03:07 -0500; Where is a selectivity spec or a description?? 73 Tom Tom, Apart from the N2PK analyzer, I don't know any published selectivity spec. The detector minimum res. bandwidth of the N2PK unit is 7 Hz and; /archives//html/Topband/2014-03/msg00066.html (12,105 bytes)
98. Re: Topband: 50 ohm direct burial coax cable (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 14 Jun 2014 13:33:13 -0400; "A quarter wavelength 75 ohm coax working into a 50 ohm load, transforms the 50 ohm load to 112.5 ohms, non-reactive, as it appears at the end of the coax next to the transmitter, as previously discu; /archives//html/Topband/2014-06/msg00092.html (8,733 bytes)
99. Re: Topband: Rig Comparisons (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 2 Aug 2014 20:46:05 -0400; "I read the technical report on "Pure Signal" and it sounds like what we used to call a "hero experiment" in the research lab where I worked, consisting of a few impressive results, but with many dis; /archives//html/Topband/2014-08/msg00010.html (9,345 bytes)
100. Re: Topband: Rig Comparisons (score: 1): Author: Paul Christensen <w9ac@arrl.net>; Date: Sun, 03 Aug 2014 08:52:04 -0400; Rick, You likely read it right but the report implies too much emphasis on needing LDMOS devices to achieve excellent linearity. For example, if you look at the ANAN-100D improvement, itąs accomplis; /archives//html/Topband/2014-08/msg00014.html (10,525 bytes)

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