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41. Re: Topband: 160 CW (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 5 Oct 2008 12:10:00 -0400
There was an article in QST on this sometime last year, complete with a parts list, etc. Dan _______________________________________________ Topband mailing list Topband@contesting.com http://lists.
/archives//html/Topband/2008-10/msg00025.html (7,507 bytes)

42. Re: Topband: Signal source and distance from antenna? (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 5 Oct 2008 18:30:40 -0400
What do YOU guys use to determine which antenna works better or if you've I use a TTL can oscillator that runs at 1.843 MHz. I'd probably recommend a self-contained antenna apparatus... little magnet
/archives//html/Topband/2008-10/msg00029.html (8,368 bytes)

43. Re: Topband: Antenna advice needed (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 26 Oct 2008 13:59:41 -0400
"I have a 50 feet vertical , it is a Killer on 75m but not so hot on 160m." How sturdy is it? could you add a trap and some wire to make it an inverted L on 160? Dan _________________________________
/archives//html/Topband/2008-10/msg00150.html (6,680 bytes)

44. Re: Topband: Preamplifier W7IUV and others questions (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Tue, 30 Dec 2008 11:23:58 -0500
Band DX'ing" chapter 7-98 but can't find the 2N5109 nor the 2N3866. Anyone I think Mouser ships worldwide, and they have the 2N5109 in stock for about 1.50 http://it.mouser.com/Search/Refine.aspx?Ke
/archives//html/Topband/2008-12/msg00284.html (7,675 bytes)

45. Re: Topband: Binocular transformer design (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 4 Jan 2009 18:54:37 -0500
On the low bands you're probably talking an ohm or less of stray inductive reactance. Just try it. I just did. I took about three inches of wire and put that across my MFJ-259B It reads 0+j0. When I
/archives//html/Topband/2009-01/msg00022.html (9,079 bytes)

46. Re: Topband: Improving the Fabulous CQ 160 Contest (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Wed, 7 Jan 2009 09:17:12 -0500
Holiday travel is my reason. I love Stew Perry but the timing is not very convenient for me. I'm pretty likely to be out of town. -Dan _______________________________________________ Topband mailing
/archives//html/Topband/2009-01/msg00043.html (8,150 bytes)

47. Re: Topband: QRQ vs QRS (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Wed, 21 Jan 2009 09:03:36 -0500
Lars, If I have a needed station who CQs in my face whenever I call, I will always switch speeds a couple times before giving up. I usually leave the keyer at 20WPM because that seems to be a good c
/archives//html/Topband/2009-01/msg00208.html (7,600 bytes)

48. Re: Topband: Recycled ferrites for 160m (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Wed, 21 Jan 2009 09:23:29 -0500
If you have an antenna analyzer you can get a decent idea of how the thing works by winding a few turns of wire onto the core and measuring the impedance of that. Shooting for a total impedance arou
/archives//html/Topband/2009-01/msg00209.html (10,332 bytes)

49. Re: Topband: Recycled ferrites for 160m (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Wed, 21 Jan 2009 09:24:24 -0500
That should be (M/N)^2 times the impedance you measured... _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailman/listinfo/to
/archives//html/Topband/2009-01/msg00210.html (7,442 bytes)

50. Re: Topband: Recycled ferrites for 160m (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Wed, 21 Jan 2009 13:09:01 -0500
Jim, you're talking about the finished choke, right? Putting -j11,000 ohms (8pF like my MFJ-259 @ 1.8MHz ) in parallel with 30+j50 or whatever my test winding shows is basically irrelevant. If you t
/archives//html/Topband/2009-01/msg00217.html (8,506 bytes)

51. Re: Topband: contesting versus dx'ing (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Sun, 25 Jan 2009 20:26:21 -0500
While that's true, I got 6W/DL2RMC for #101 with 100W last night ;-) I also set my SpotCollector software to 160m only, DX only, LoTW users only and worked the few that showed up unconfirmed to get a
/archives//html/Topband/2009-01/msg00276.html (7,435 bytes)

52. Re: Topband: QSB surfing (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Wed, 11 Feb 2009 17:24:04 -0500
This is the big thing I learned from hanging around with you good topband guys. It's never been so much of an issue on higher bands, when miscopies are rarely the result of total signal disappearanc
/archives//html/Topband/2009-02/msg00057.html (7,630 bytes)

53. Re: Topband: QSB surfing (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Thu, 12 Feb 2009 13:00:47 -0500
I had this problem with TX5C who thought I was N3MX and never pulled me out. Granted, I'm sure I was hopelessly weak out there, and that's my fault, but we went back and forth six or seven times I t
/archives//html/Topband/2009-02/msg00069.html (8,564 bytes)

54. Topband: Actual RF current measurements... (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Sun, 19 Apr 2009 16:44:40 -0400
So I did a little experiment today. I built a low-capacitance current meter much like the one at : http://www.w8ji.com/building_a_current_meter.htm I used a plastic case meter. I calibrated it to 1A
/archives//html/Topband/2009-04/msg00051.html (9,968 bytes)

55. Re: Topband: 1.99? (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Mon, 27 Apr 2009 13:35:44 -0400
I can throw my hat in the ring too if you need a little guy. I doubt I'm going to be able to work Ross just by QSYing to 1.990MHz but I'm set up with a vacuum variable cap such that I can QSY up the
/archives//html/Topband/2009-04/msg00086.html (6,647 bytes)

56. Re: Topband: Beacon Update (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Tue, 5 May 2009 20:00:04 -0400
When I listened (and I was one who reported maybe a very slight advantage to 1999.5, despite the presence of a little more local noise up there), the beacon was very light copy in either case, down n
/archives//html/Topband/2009-05/msg00022.html (9,254 bytes)

57. Re: Topband: How Helically Wound Verticals Really Work (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Thu, 16 Jul 2009 12:37:21 -0400
Even faster is a motor driven tap switch. Of course, relays can be used but with a motor driven rotary switch you can easily have 8 different 160m taps, 3 80m/75m taps, and a 40m tap to handle your
/archives//html/Topband/2009-07/msg00063.html (9,824 bytes)

58. Re: Topband: QEX article and T-vertical improvement (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Sun, 19 Jul 2009 13:06:28 -0400
Among other things, the time to switch over... I've just spent a couple of weeks building a new switching arrangement for my switched L networks without any performance increase other than that the
/archives//html/Topband/2009-07/msg00079.html (9,099 bytes)

59. Re: Topband: T - vertical improvement (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Thu, 23 Jul 2009 23:21:43 -0400
Wait a second. 1500W into 35 or so ohms is like 6.6A... running through -j235 ohm capacitor is more like 1500Vrms/2100V peak. 10kVrms across a 370pF cap at 1.8MHz is 42A flowing through. That's near
/archives//html/Topband/2009-07/msg00105.html (8,441 bytes)

60. Re: Topband: Topband loaded dipole (score: 1)
Author: Dan Zimmerman N3OX <n3ox@n3ox.net>
Date: Fri, 24 Jul 2009 13:15:37 -0400
You also don't necessarily have to choose if you install radials and a switching system to switch the feed at the bottom from differential driving of the feedline to common-mode driving of both cond
/archives//html/Topband/2009-07/msg00117.html (7,758 bytes)

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