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Total 90 documents matching your query.

21. Re: Topband: Project Boxes for 160 meter Preamplifiers? (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Fri, 14 Sep 2007 09:11:36 -0400
"Plastic boxes outdoors need to be spray painted - Krylon works" There's a paint for plastic that Rust-Oleum makes and I use the textured stuff... I'm sure other brands have plastic paint too... That
/archives//html/Topband/2007-09/msg00094.html (7,354 bytes)

22. Topband: Extra isolation transformers? (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sat, 15 Sep 2007 23:11:44 -0400
Any reason not to use a 1:1 transformer wound on a Fair-Rite 2873000202 instead of a conventional feedline choke to get extra common mode impedance for my flag feedline? I'm not phasing it with anyth
/archives//html/Topband/2007-09/msg00102.html (7,397 bytes)

23. Re: Topband: 160 meter band Antenna. (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 30 Sep 2007 18:28:41 -0400
(strange with 15+14.5 >meter) the swr value is something around 3+ from my MFJ analyser I measure around Rune, you need a bigger capacitor. I think you're measuring the natural feed impedance of the
/archives//html/Topband/2007-09/msg00171.html (7,971 bytes)

24. Re: Topband: Binocular Xfrmr (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Thu, 18 Oct 2007 10:23:08 -0400
A miserable failure in what sense? My flag transformer is very similar but 2 turn primary/7 turn secondary. It gives a 2:1 SWR on 160m but the antenna still seems to work okay on 160m and I don't se
/archives//html/Topband/2007-10/msg00070.html (7,853 bytes)

25. Re: Topband: Binocular Xfrmr (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Thu, 18 Oct 2007 10:23:52 -0400
I'm sorry, a correction... it's not 2:1 SWR now that I think of it. It's 1.5:1 , because it's 100 ohms on 75 ohm line. Dan _______________________________________________ Topband mailing list Topband
/archives//html/Topband/2007-10/msg00071.html (7,108 bytes)

26. Re: Topband: Unique Short Radial Challenge (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 21 Oct 2007 09:24:57 -0400
Salt water is a great RF conductor as far as things that are laying on the surface of the earth go ... versus dirt, rocks, etc, it's great, but it's still over 10 million times worse than copper. I
/archives//html/Topband/2007-10/msg00107.html (9,884 bytes)

27. Re: Topband: strange condx in jo42 (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sat, 3 Nov 2007 15:18:28 -0400
eastcoast with 579 >rapports and I didn't hear anything....Crazy! Andy, I can verify that he was quite a bit stronger than you were here. 200km makes a lot of difference I guess! ___________________
/archives//html/Topband/2007-11/msg00006.html (6,635 bytes)

28. Re: Topband: One way propagation (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Mon, 12 Nov 2007 19:25:35 -0500
Nonlinear isotropic media are a *necessary* but *not sufficient* condition for nonreciprocal electromagnetic wave propagation. I'm not saying it can't happen, but the nonlinearity and anisotropy of
/archives//html/Topband/2007-11/msg00082.html (7,153 bytes)

29. Re: Topband: Silver Plated Conductor (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Wed, 21 Nov 2007 19:55:50 -0700
"To get an idea of "what a difference a dB makes", download a copy of Audacity [a free program] and install it. Then take a .wav file and listen to it for a brief period. Next reduce the audio playba
/archives//html/Topband/2007-11/msg00178.html (8,765 bytes)

30. Re: Topband: Finding buried radials (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 25 Nov 2007 22:09:03 -0500
I'm in a fairly high broadcast RF environment and that makes it a snap to find the radials with a small AM broadcast receiver. You might try it if you have a portable AM RX with a ferrite loop antenn
/archives//html/Topband/2007-11/msg00202.html (7,376 bytes)

31. Re: Topband: [TowerTalk] 160 RX antenna (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 30 Dec 2007 23:06:55 -0500
"My vertical is over 1000 ft from any power line and is plenty noisy when connected to a battery operated receiver at the base of the antenna." I dream of the days when I can have anything 1000 feet
/archives//html/Topband/2007-12/msg00232.html (7,838 bytes)

32. Topband: Variable Flag Termination? (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Wed, 2 Jan 2008 18:01:57 -0500
I took a pass at optimizing my flag termination a few days ago and got a pretty respectable pattern on an AM broadcast station, WWWT AM 1500 about 10 miles from my house during daylight hours: http:/
/archives//html/Topband/2008-01/msg00022.html (8,417 bytes)

33. Re: Topband: Variable Flag Termination? (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Thu, 3 Jan 2008 10:17:22 -0500
"In fact, if you plug in 1300 ohms you'll see a very major erosion of the F/B ratio from 33 db to less than 17 db. In addition the sharp inward, deep null goes away and the cardiod starts looking lik
/archives//html/Topband/2008-01/msg00029.html (9,263 bytes)

34. Re: Topband: Boring Report - Directivity gone? (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Thu, 3 Jan 2008 17:40:36 -0500
This discussion makes me wonder if my perceived flag issues, which happened TWO days ago were the same thing... I didn't seem to have F/B on signals coming from either direction... F5IN was easily r
/archives//html/Topband/2008-01/msg00035.html (7,513 bytes)

35. Topband: Rotatable flag description and pictures (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 6 Jan 2008 22:11:43 -0500
I finished writing up my description of my small rotatable, variable termination flag antenna and maybe there's some interest: I've drawn from many sources while building it; thanks to everyone who's
/archives//html/Topband/2008-01/msg00068.html (7,104 bytes)

36. Re: Topband: Who turned the band on? (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Fri, 1 Feb 2008 11:57:42 -0500
I stayed on kind of late (0530?) and signals just kept booming in all night, and quite a few big signals on as EU started to get up in the morning. OE3GCU, S59A, G3XGC, IV3PRK and others were 599+ I
/archives//html/Topband/2008-02/msg00004.html (8,250 bytes)

37. Re: Topband: Preamp for 160 (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Mon, 19 May 2008 22:51:10 -0400
No measurable loss will occur if you just solder cheap radio shack RCA connectors to the coax or use adapters to some more common RF connectors. I doubt you'd get measurable loss if you taped the co
/archives//html/Topband/2008-05/msg00048.html (8,146 bytes)

38. Re: Topband: Vertical question (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Fri, 5 Sep 2008 09:25:00 -0400
"I want to use it for 80m as well, but avoid lossy trap arrangements." Traps aren't necessarily lossy. Good ones have extremely low loss. If you had horizontal space, you might do a 160m/80m inverted
/archives//html/Topband/2008-09/msg00009.html (11,354 bytes)

39. Re: Topband: Vertical question (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sat, 6 Sep 2008 20:17:43 -0400
This is absolutely my choice whenever I can use it...possibly first and foremost because it's nearly free. You just need one more little homemade coil of wire, you tweak the coil tap on the big indu
/archives//html/Topband/2008-09/msg00018.html (8,116 bytes)

40. Re: Topband: umbrella loading (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 7 Sep 2008 15:20:34 -0400
less than at the top The top loading tends to "win" in this case, and the part above the umbrella doesn't do much radiating. The entire immediate vicinity of the whip above the umbrella hat becomes
/archives//html/Topband/2008-09/msg00022.html (8,690 bytes)

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