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61. Re: Topband: Phased Array Book (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Mon, 10 Aug 2009 14:08:35 -0400
I'm going to read "Amateur radio application(s) of antenna phasing" as "Low band application(s) of antenna phasing" given the context. I pulled down some R.J. Mailloux articles from the IEEE and alt
/archives//html/Topband/2009-08/msg00034.html (10,453 bytes)

62. Re: Topband: InfoK9AY Phased array and EWE posible problem. (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Wed, 12 Aug 2009 13:10:37 -0400
I think it is connected between feed and term resistor grounds. This makes the whole thing into basically a flag on the ground (FOG?) antenna, and I'd probably just lift it up a bit and make it comp
/archives//html/Topband/2009-08/msg00062.html (7,507 bytes)

63. Re: Topband: EZNEC Shunt Feed Model Gain (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Tue, 18 Aug 2009 22:59:48 -0400
There are other issues important to shunt fed towers. NEC-2 has issues with sources in small loops. For standard NEC-2 (not double precision NEC-2D or NEC-4 according to the manual) that seems to be
/archives//html/Topband/2009-08/msg00079.html (8,677 bytes)

64. Re: Topband: HyGain-18HT on 160 (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Sun, 30 Aug 2009 22:35:01 -0400
Loading coil and shunt coil in an L network switched in and out with vacuum relays should work. I use a 60 foot wire vertical on all bands 160m thru 30m. This is how I do it: http://www.n3ox.net/pro
/archives//html/Topband/2009-09/msg00000.html (9,267 bytes)

65. Re: Topband: What the heck? (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Wed, 16 Sep 2009 10:29:44 -0400
Anybody know what it is? Fishing buoy? I think so. There are a bunch I hear here and the "callsigns" are pretty random. There's one that I really hate... listening and I hear a weak signal: "4L..."
/archives//html/Topband/2009-09/msg00067.html (7,536 bytes)

66. Re: Topband: Make 80m vertical work on 160 (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Sun, 4 Oct 2009 19:24:51 -0400
I use a coil to load my 80m vertical on a fiberglass pole to resonance on 160m. I recently built a computer controlled switch to handle the switching for me: http://n3ox.net/projects/stepperswitch/
/archives//html/Topband/2009-10/msg00077.html (14,624 bytes)

67. Re: Topband: AAARRRAAGH ##$!@@!! (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Tue, 3 Nov 2009 13:53:44 -0500
Don't blame the gear. Blame the people who can't figure out that if their system is so narrow that they can't pick an alternative clear frequency nearby, they really should tune up on the frequency
/archives//html/Topband/2009-11/msg00061.html (7,259 bytes)

68. Re: Topband: AAARRRAAGH ##$!@@!! (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Tue, 3 Nov 2009 17:18:20 -0500
Or heck, pick the frequency you're **going to use** in the pileup. A pileup is basically a bunch of acceptable intentional QRM. While it's not acceptable to throw a carrier on a pileup *intentionall
/archives//html/Topband/2009-11/msg00075.html (9,837 bytes)

69. Re: Topband: Trees And RF (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Tue, 3 Nov 2009 23:48:06 -0500
"A quick google on tree antennas gave me this: http://w5jgv.com/tree_antenna/index.htm which has links to some stuff" I don't buy that that guy is actually loading a tree.... that is, I doubt he's co
/archives//html/Topband/2009-11/msg00097.html (9,081 bytes)

70. Re: Topband: overposting (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Mon, 9 Nov 2009 16:43:49 -0500
I disagree. Moderated lists are moderated for a reason. The moderation allows outright rejection of things that will just stir up a flurry of activity, angry or poorly though out responses, or that
/archives//html/Topband/2009-11/msg00278.html (8,540 bytes)

71. Re: Topband: What are these weak birdies every 10.0000 KHz? (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Mon, 22 Feb 2010 22:22:31 -0500
I think the rotator might be a "must check." I was getting a bursty, extremely loud birdie on 1830 when the wind blew. I knew from prior experience that this was a strong local mix at my location, a
/archives//html/Topband/2010-02/msg00183.html (8,968 bytes)

72. Re: Topband: Beverage transformer questions (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Fri, 5 Mar 2010 18:18:58 -0500
Fair Rite Products 2873000202 or BN-73-202 from Amidon, I think. I use three of them stacked for my flag transformer. 73 Dan _______________________________________________ UR RST IS ... ... ..9 QSB
/archives//html/Topband/2010-03/msg00038.html (7,577 bytes)

73. Re: Topband: half size flag antenna--NW6S (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Tue, 9 Mar 2010 22:17:52 -0500
In principle, it should be the same value as for the larger one (940 ohms I think) In practice you probably want to experiment. The optimum termination value to get best F/B on my flag is higher, up
/archives//html/Topband/2010-03/msg00053.html (7,978 bytes)

74. Re: Topband: MFJ259B QUERY (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Sun, 30 May 2010 11:59:31 -0400
That seems about right, for example, for RG-213 terminated in an open circuit. You can use VK1OD's transmission line calculator to investigate the predicted impedance of an open circuit stub. Select
/archives//html/Topband/2010-05/msg00066.html (7,854 bytes)

75. Re: Topband: Elevated Radials as a sub for the real thing? (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Tue, 26 Oct 2010 18:29:56 -0400
They don't act as dipoles because the current phase is such that current is going out into both halves at one point in the RF cycle and back in toward the feedpoint 180 degrees later. Since they're
/archives//html/Topband/2010-10/msg00129.html (9,107 bytes)

76. Re: Topband: Elevated Radials (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Sun, 31 Oct 2010 13:28:07 -0400
and the FIRST TIME AROUND squeeze the last dB out of what is going to be a considerable project, because they don't have the time to try five different things, one at a time, each one occupying all
/archives//html/Topband/2010-10/msg00144.html (13,819 bytes)

77. Re: Topband: I just want to vent (a little) (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Thu, 11 Nov 2010 12:02:58 -0500
In terms of DXing ethics I don't see it as any problem at all, just like I think a one-ringer is fine. I think there is a huge practical difference, however, between a one-ringer and me spotting one
/archives//html/Topband/2010-11/msg00044.html (9,080 bytes)

78. Re: Topband: Web SDR's and 'Cheating' (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Fri, 11 Feb 2011 14:26:36 -0500
I think you could go a long way to solving the problem of cheating if you implemented a frequency-aware conditional delay. If the receiver spends more than 30 seconds or 1 minute in the 1800-1850kHz
/archives//html/Topband/2011-02/msg00105.html (11,539 bytes)

79. Re: Topband: MFJ-259B (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Tue, 19 Apr 2011 10:03:31 -0400
Before you start tweaking, try some other loads. Try a capacitor of known value. Try a 200 ohm resistor and a 12.5 ohm resistor. In fact, go ahead and try all the loads in W8JI's calibration procedu
/archives//html/Topband/2011-04/msg00046.html (8,778 bytes)

80. Re: Topband: Spurs (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Thu, 21 Apr 2011 09:59:19 -0400
Sort of. I have one like that 1830 that's strong local AM BCB on 1500 mixing with CHU on 3330. It's usually not very strong and I didn't identify it until it got really bad and I heard the distincti
/archives//html/Topband/2011-04/msg00058.html (7,937 bytes)

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