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101. Re: Topband: AM interference on 1840 (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Tue, 21 May 2019 07:50:02 -0400
There are two messages in this topic: One is the interference from this particular BC station. Not a crisis, not yet. Two is a warning: Newly installed solid-state AM broadcast amplifiers in poorly r
/archives//html/Topband/2019-05/msg00071.html (9,767 bytes)

102. Re: Topband: DHDL (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Sun, 30 Jun 2019 13:29:14 -0400
Martin, Two things: 1. The antenna does not become "useless" when the loops are longer than 1/4 wave. It just won't work as a DHDL, but may still be useful as a low noise RX antenna. 2. The DHDL is a
/archives//html/Topband/2019-06/msg00041.html (8,369 bytes)

103. Re: Topband: Broadband DHDL (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Sat, 27 Jul 2019 16:04:33 -0400
David, I have modeled both side-by-side and in-line phased DHDL arrays, but I have only tested the in-line version. NEC indicates that a RDF of 12 dB is possible. The in-line DHDL array that I have t
/archives//html/Topband/2019-07/msg00109.html (9,060 bytes)

104. Re: Topband: Summer Update & a Surprise (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Thu, 01 Aug 2019 23:57:46 -0400
Andy is right: FT8 should in a separate category. Especially, when we consider the "dirty little secret": Increasingly, a number of ops are using fully automated FT8 stations. Most of the time they a
/archives//html/Topband/2019-08/msg00063.html (12,581 bytes)

105. Re: Topband: 160 (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Fri, 02 Aug 2019 20:06:13 -0400
Nobody is talking about "shutting" anything down. Quite the opposite: expand the DXCC program by creating a new category! FT-x is sufficiently different to justify that. The skills need for FT-x are
/archives//html/Topband/2019-08/msg00091.html (13,599 bytes)

106. Re: Topband: 160 portable vertical (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Wed, 07 Aug 2019 21:15:58 -0400
Pat, There is one thing that could make a "portable" antenna and QRP work on 160 meters: Salt water! If you can make the antenna stand over and grounded to the water, or right on the water's edge wit
/archives//html/Topband/2019-08/msg00200.html (9,037 bytes)

107. Re: Topband: 160 meter antenna possibilities (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Sat, 24 Aug 2019 12:02:49 -0400
Byron, I would go with the T (and a good radial field). George, AA7JV/C6AGU On Sat, 24 Aug 2019 14:14:13 +0000 (UTC) Byron Tatum <bjtatum1@att.net> wrote: Hello-   I hope I do not intrude too much he
/archives//html/Topband/2019-08/msg00255.html (9,308 bytes)

108. Re: Topband: 160 skip distance (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Tue, 17 Sep 2019 18:59:12 -0400
During both the ARRL 160 or the CQWW 160 CW contests from C6AGU (FL14tv, a very quiet location) about 250 miles east of FL, I hear and work stations during the day well into the continental US: somet
/archives//html/Topband/2019-09/msg00083.html (8,631 bytes)

109. Re: Topband: spark gap construction ideas for 160m tower (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Mon, 07 Oct 2019 09:09:54 -0400
Jeff, I use stainless steel acorn nuts on the ends of matching screws. Not a complete ball, but the facing surfaces are rounded. George, AA7JV Making the spark gap is simple. What has me asking for i
/archives//html/Topband/2019-10/msg00023.html (9,562 bytes)

110. Re: Topband: A Bit of Zone 2 History Was Made Last Week (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Sat, 09 Nov 2019 00:21:13 -0500
Jeff, Please ignore the negative comments. FT8 is perfectly good. CW would have been harder but "better"! (i.e. more valued by the old-timers.) But with FT8 you've made more people happy! 73, George,
/archives//html/Topband/2019-11/msg00017.html (11,746 bytes)

111. Re: Topband: A Bit of Zone 2 History -- FT8 (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Sun, 10 Nov 2019 01:16:35 -0500
Gentlemen, I think we need to be a bit more thoughtful about the role of FT8. "Real Amateur Radio" probably started to disappear 40 years ago: digital transceivers, SSB, Yagis on rotators, etc. Altho
/archives//html/Topband/2019-11/msg00029.html (11,638 bytes)

112. Re: Topband: Band Conditions (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Thu, 21 Nov 2019 02:41:42 -0500
Hello Topbanders, Good conditions tonight towards EU from C6AGU, Bahamas, FL14uv. The band is certainly alive and well. The location is very quiet here. Using the TX ANT for RX worked 200+ EU this ev
/archives//html/Topband/2019-11/msg00089.html (8,110 bytes)

113. Re: Topband: C6AGU (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Thu, 21 Nov 2019 21:23:29 -0500
Rino, TKS for the QSO! 73, George thanks for qso this morning, i want inform you i'm calling first time with 100w, sure you have good RX than i'm use more pwr. Rino IK7JTF _________________ Searchabl
/archives//html/Topband/2019-11/msg00101.html (6,861 bytes)

114. Re: Topband: Ohmic resistance question (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Sat, 23 Nov 2019 23:04:44 -0500
I think the question was meant as a joke, as it is called "galvanic isolation". (It is either Ohmic or isolation.) 73, George, AA7JV Response from the designer W8GNM to your ohmic resistance question
/archives//html/Topband/2019-11/msg00117.html (7,523 bytes)

115. Re: Topband: Saturday night (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Sun, 24 Nov 2019 14:30:36 -0500
David, I was the 160 m operator at C6AGU Saturday night. During the week, ahead of the contest, I was on 160 a few nights and worked 100-s of EU-s under good conditions. But conditions here towards E
/archives//html/Topband/2019-11/msg00126.html (10,119 bytes)

116. Re: Topband: 12V through coax (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Sat, 07 Dec 2019 17:02:15 -0500
Tony, The component values are not critical, especially in a RX only application. The rule of thumb I use is that the reactance (AC resistance) should be 20 x the impedance for the choke and 1/20 for
/archives//html/Topband/2019-12/msg00055.html (9,175 bytes)

117. Re: Topband: 2019 STEW PERRY (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Tue, 31 Dec 2019 10:02:54 -0500
UX2X was a solid S9 in FL during then entire evening. UW2M, UX1UA were S8. Never heard US1S. (TX antenna only.) 73 and HNY, George, AA7JV -- Nick, UY0ZG http://www.topband.in.ua Bill Weaver 2019-12-3
/archives//html/Topband/2019-12/msg00242.html (9,754 bytes)

118. Re: Topband: 160m vertical saltwater grounding (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Thu, 09 Jan 2020 09:29:58 -0500
Robert, You only have to "connect" to the salt-water. Don't worry about radials or field of radials. From you coax shield, or whatever GND (common) you have, run as many wires as you can into the wat
/archives//html/Topband/2020-01/msg00094.html (11,356 bytes)

119. Re: Topband: de n7dd (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Thu, 09 Jan 2020 09:50:17 -0500
Larry, It will be hard to find. You can find HEC HT75 100 or 200 pF, 15 kV with -750 tempco. You could parallel them to get 500 pF. Alternatively, there are Russian 470 pF, 15 kV, -1500 tempco caps a
/archives//html/Topband/2020-01/msg00096.html (7,434 bytes)

120. Re: Topband: 160m vertical saltwater grounding (score: 1)
Author: GEORGE WALLNER <aa7jv@atlanticbb.net>
Date: Thu, 09 Jan 2020 10:02:24 -0500
Rob, This is a good reference. Only one comment: I found recently on C6AGU that on 160 m the 2 -3 foot tidal change cause only a small change in the SWR of a tuned inverted L with its metal base stan
/archives//html/Topband/2020-01/msg00097.html (9,412 bytes)

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