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101. Re: Topband: Rig Comparisons (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Sun, 3 Aug 2014 10:58:39 -0400
Tom, Also consider a situation where a solid-state transceiver is driving a class B amp with, for example, -20 dBc 3rd order IMD -- and that IMD is much worse than the driving transmitter. In that ca
/archives//html/Topband/2014-08/msg00017.html (10,768 bytes)

102. Re: Topband: Rig Comparisons (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Sun, 3 Aug 2014 11:00:53 -0400
Sorry for the dyslexia. I've been meaning to type APD, not ADP. Paul, W9AC Sent from my iPhone5 _________________ Topband Reflector Archives - http://www.contesting.com/_topband
/archives//html/Topband/2014-08/msg00018.html (11,177 bytes)

103. Re: Topband: ROKU 3 QRM (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 18 Sep 2014 17:18:50 -0400
" from a 12V battery that is floated by a small linear supply. (A year or so ago, I went through my home and got rid of all the switch-mode crap). At last count, I have more than a dozen linear suppl
/archives//html/Topband/2014-09/msg00103.html (7,945 bytes)

104. Re: Topband: EZNEC 5.0 + (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 5 Dec 2014 19:35:38 -0500
Rich, It's an issue that's not usually seen in the broadcast engineering world where one frequency is transmitted for broadcast. Typically a transmitter will fold-back delivered power when its output
/archives//html/Topband/2014-12/msg00047.html (11,261 bytes)

105. Re: Topband: EZNEC 5.0 + (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 5 Dec 2014 23:22:42 -0500
"What did they call the teens to 20's antenna that had multiple feeds coming down from one end of the flatop to the other?" Both the "T" and the fanned inverted L were popular on 200m in 1910-1920 ju
/archives//html/Topband/2014-12/msg00050.html (8,832 bytes)

106. Re: Topband: EZNEC 5.0 + (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 6 Dec 2014 09:47:28 -0500
Not sure that I can picture just what you are describing, Paul. Even though, I wasn't born until 1944, I've explored just about every type of antenna and I've modeled an awful lot of them. See the im
/archives//html/Topband/2014-12/msg00063.html (10,379 bytes)

107. Re: Topband: Silver solder (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 31 Dec 2014 09:03:59 -0500
"The only issue is that solder requires a bit more heat then the leaded solder." To get adequate heat when using silver-solder bars, one option is to use a small acetylene cylinder tank with a single
/archives//html/Topband/2014-12/msg00484.html (8,947 bytes)

108. Re: Topband: Silver solder (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 1 Jan 2015 17:37:17 -0500
These are mid-level silver sticks with 15% silver + copper/phosphor and have a working temperature of 1200-1400 degs. F but not the 2-5% silver bearing variety with a lower melting point. You are pr
/archives//html/Topband/2015-01/msg00005.html (7,883 bytes)

109. Re: Topband: 78th Anniversary of First Ham License (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 21 Jan 2015 07:55:08 -0500
When Paul was licensed in January, 1937, the 6L6 was just being mass produced. The National NC-101X had not yet been designed and the regenerative SW-3 was still being sold along with the new HRO. Cr
/archives//html/Topband/2015-01/msg00150.html (10,359 bytes)

110. Re: Topband: EP6T and outside world (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Fri, 23 Jan 2015 18:56:06 -0500
To Frank¹s point, here are some additional early commercial 160m receiver examples: National SW-3 (ca. 1931 regenerative with dedicated 160m band spread coils) National HRO (ca. 1935 with sliding 16
/archives//html/Topband/2015-01/msg00203.html (8,995 bytes)

111. Topband: Elimination of Treadmill RFI on 160 meters (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 31 Jan 2015 08:48:32 -0500
"Bifilar winding of power leads is a two edged sword. While it reduces core flux from power line currents, it also reduces differential suppression in a similar fashion. In a tightly coupled choke, t
/archives//html/Topband/2015-01/msg00342.html (9,645 bytes)

112. Topband: Radial Plate Designs (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 4 Feb 2015 10:17:20 -0500
I've long thought about designing a radial plate that addresses some significant limitations with currently available product. Specially, every commercially available radial plate uses single-hole lu
/archives//html/Topband/2015-02/msg00068.html (13,030 bytes)

113. Re: Topband: [Bulk] Top Loading wires (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Wed, 04 Feb 2015 13:52:34 -0500
I just modeled a 90 ft tower with a flat T top of #12 that varies from 28 ft to 60 ft from center. A total of 30, 1/4 wave radials are buried six inches. I¹m using 4Nec2 with NEC v4.2. This is not y
/archives//html/Topband/2015-02/msg00084.html (9,072 bytes)

114. Re: Topband: [Bulk] Top Loading wires (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Wed, 04 Feb 2015 15:44:57 -0500
On one 160m project, we used these 600-ohm open feed line spreaders from 73CNC.com to form the vertical radiator: http://www.73cnc.com/product_p/ls100.htm Yes, these spreaders are meant for transmis
/archives//html/Topband/2015-02/msg00101.html (8,696 bytes)

115. Re: Topband: AC line bypass capacitors (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Wed, 04 Feb 2015 15:55:27 -0500
As a substitute for X1 Y2 line caps, an in-line RFI/EMI filter can be used that already contains the X/Y-rated caps. See the bottom of p. 21: http://audiosystemsgroup.com/RFI-Ham.pdf These filters c
/archives//html/Topband/2015-02/msg00102.html (8,105 bytes)

116. Re: Topband: Foreign stns using NA remotes for K1N (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 5 Feb 2015 08:46:49 -0500
"It is not about remote technology or use of or for DXCC, it is the change into a enterprise carrier service $/min or $/KW. " Now, extrapolate the RHR business model to hundreds of similar paid remot
/archives//html/Topband/2015-02/msg00160.html (11,029 bytes)

117. Re: Topband: Foreign stns using NA remotes for K1N (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 5 Feb 2015 10:27:33 -0500
Quoting myself: 'Rather than embracing this commercial abuse of free spectrum, the League should be scrambling to draft a Petition for Rulemaking to prohibit this form of paid spectrum access - and t
/archives//html/Topband/2015-02/msg00168.html (13,570 bytes)

118. Re: Topband: Foreign stns using NA remotes for K1N (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 5 Feb 2015 11:07:01 -0500
"that has a radio. Sad, but true. Maybe it's time the amateur community try to get Part 97 changed. I doubt anyone had this in mind when the original regs were drafted." Larry, Wow, that's not an opi
/archives//html/Topband/2015-02/msg00172.html (11,620 bytes)

119. Re: Topband: Foreign stns using NA remotes for K1N (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 5 Feb 2015 11:09:47 -0500
"I'm sure you realize this, because people just never complain without actually knowing how things really work, but RHR isn't the only site. There are a dozen others, and some are completely free and
/archives//html/Topband/2015-02/msg00173.html (10,599 bytes)

120. Re: Topband: Foreign stns using NA remotes for K1N (score: 1)
Author: Paul Christensen <w9ac@arrl.net>
Date: Thu, 05 Feb 2015 12:11:03 -0500
'The KEY WORD is the "COMMUNICATIONS².¹ Milt, We¹ve already addressed ³communications.² A definition needs to be added to Part 97.3. Absent a definition, there is no clear meaning of the term and is
/archives//html/Topband/2015-02/msg00184.html (10,829 bytes)

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