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Total 90 documents matching your query.

1. Re: Topband: Feeding vertical (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Mon, 11 Dec 2006 09:26:22 -0500
A simple L-network should have very modest-value components to match this thing on 160. I assume the towers are 1/4 wavelength (280 feet) at 870KHz. A very wild guess for the impedance on 1.8MHz base
/archives//html/Topband/2006-12/msg00126.html (7,426 bytes)

2. Topband: G3YXM Throbbatron Mosfet Amp (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Tue, 12 Dec 2006 18:02:13 -0500
I'm looking to do some limited 160 DXing from my small lot, and my maximum possible radial system is pretty tiny, so I'm looking to get some power to make up for antenna inefficiency. I came across t
/archives//html/Topband/2006-12/msg00141.html (7,574 bytes)

3. Topband: Radials around the house . . . (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Wed, 20 Dec 2006 09:54:09 -0500
I'm on a really small lot and have put down as much of a radial system in the back yard as I can. It's 27 radials out to the edges of the yard, 40 feet square, so pretty miserable for the low bands.
/archives//html/Topband/2006-12/msg00200.html (7,923 bytes)

4. Topband: Measuring field strength (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Wed, 20 Dec 2006 15:06:58 -0500
I've had lots of good responses regarding putting radials out to the front yard. I'm going to run radials around to the front of the house, possibly by putting a perimeter wire around the house. I'd
/archives//html/Topband/2006-12/msg00205.html (7,427 bytes)

5. Re: Topband: Measuring field strength (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sat, 23 Dec 2006 09:59:46 -0500
This is what I'm planning on doing when I return next week. I'm thinking of doing the following, and I'm interested in comments. I have a small CW transmitter (about 110mW) that I can set up 1 wavel
/archives//html/Topband/2006-12/msg00250.html (9,266 bytes)

6. Topband: Radial directivity (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Thu, 28 Dec 2006 18:08:52 -0500
I added a bunch of new radials to the sides and front of the house, and found that the signal from my TTL clock crystal transmitter out in the field away goes DOWN by about 1dB with the new radials a
/archives//html/Topband/2006-12/msg00314.html (7,556 bytes)

7. Re: Topband: Radial directivity (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sat, 30 Dec 2006 15:08:16 -0500
Good news, factual news, and bad news. I put up my 60 foot vertical yesterday in place of the 40 footer. I'm still base loading but will probably hoist an inverted L for special occasions. The good n
/archives//html/Topband/2006-12/msg00353.html (8,107 bytes)

8. Topband: Flag transformer core (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 7 Jan 2007 21:31:42 -0500
I've got a couple of ~0.75" bobbin diameter type 77 pot cores (actually type 3B7 from, I think, Ferroxcube, but seems to cross-reference to 77 material) I'm looking to build a Flag to be used on 160
/archives//html/Topband/2007-01/msg00105.html (7,498 bytes)

9. Topband: W7IUV Preamp from Low Band DXing (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 14 Jan 2007 02:20:54 -0500
Just a heads-up to the flag, pennant, and K9AY builders-to-be out there. I built a W7IUV-design preamp using the 2n5109 tonight. I built it from the 4th ed. Low Band DXing so I'd have the schematic i
/archives//html/Topband/2007-01/msg00263.html (6,960 bytes)

10. Topband: 2n5160 ? (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Fri, 2 Feb 2007 03:57:14 -0500
I'm interested in building a couple of Dallas Lankford's active dipoles as seen at: http://www.kongsfjord.no/dl/Antennas/Complementary%20Push-Pull%20Output%20Active%20Whip%20And%20Dipole%20Antennas.p
/archives//html/Topband/2007-02/msg00011.html (7,286 bytes)

11. Re: Topband: Snow Effect (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Fri, 2 Feb 2007 06:16:01 -0500
My base loaded 60 foot vertical with small ground system (40ft x 40ft square + a few longer radials) shows some minor detuning with a snow/ice coat. The effect is more if the fiberglass pole support
/archives//html/Topband/2007-02/msg00014.html (7,412 bytes)

12. Re: Topband: Core for K9AY loop transformer (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Wed, 28 Mar 2007 13:16:22 -0400
Having a significant resistive component is useful if the common-mode circuit you're trying to break already has a capacitive reactance... you could make things worse with inductive reactance only.
/archives//html/Topband/2007-03/msg00144.html (7,993 bytes)

13. Re: Topband: Request from FK8CP (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Wed, 4 Apr 2007 14:40:34 -0400
I have a 13 foot x 6 foot flag and a 60 foot base loaded vertical on a smaller lot than Remi's, and I have found that the decoupling issue is exceedingly important, especially since the flag gives su
/archives//html/Topband/2007-04/msg00030.html (8,560 bytes)

14. Re: Topband: coil wire oxidation (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Fri, 6 Apr 2007 13:49:20 -0400
Try to determine if they're silver plated. If they are, don't sweat the oxidation: http://www.qsl.net/n9zia/why_silver_plate.html Dan _______________________________________________ Topband mailing l
/archives//html/Topband/2007-04/msg00044.html (7,046 bytes)

15. Re: Topband: Base linear load vertical .. halp needed (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Mon, 25 Jun 2007 17:20:34 -0400
antenna configuration wich >is the best L netwrok configuration to use? I don't know if it's the BEST one, but it works for me... bottom of the page on : http://n3ox.net/projects/sixtyvert/matching_
/archives//html/Topband/2007-06/msg00050.html (7,829 bytes)

16. Re: Topband: Extreme directivity (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Sun, 22 Jul 2007 23:47:31 -0400
"The trick was to modulate the ultrasound at sonic rates. The directivity of the ultra-sound speaker was intact. And the ear would hear the sonic modulation directly." That's not the trick. W0RI is r
/archives//html/Topband/2007-07/msg00022.html (8,560 bytes)

17. Topband: Keeping metal away from a loading coil . . . (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Tue, 21 Aug 2007 18:39:00 -0400
For the coming season I want to be a little more frequency agile on 160... especially for the contests. The antenna is a 60' base loaded wire vertical with a 2:1 SWR bandwidth of only about 20kHz. Wh
/archives//html/Topband/2007-08/msg00075.html (7,852 bytes)

18. Re: Topband: Reality check request (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Wed, 29 Aug 2007 09:43:42 -0400
Tod, I think you're OK. The tower is very much shorter than a resonant length AND the tip of the antenna is very far away from the tower. The coupling between the high current portion of the inverte
/archives//html/Topband/2007-08/msg00134.html (9,282 bytes)

19. Topband: Near field of a flag? (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Mon, 3 Sep 2007 13:48:24 -0400
This isn't really a 160m question... or even a lower HF question, but this is the place I know people are working with flags and other short RX vertical arrays, and I figure any ensuing discussion wo
/archives//html/Topband/2007-09/msg00011.html (7,740 bytes)

20. Topband: Required switch attenuation... (score: 1)
Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
Date: Tue, 11 Sep 2007 11:49:53 -0400
I just wanted to check this with those with practical experience. If you have a few flags in a few directions and want to build a switch, how much attenuation between ports do you need? I'm thinking
/archives//html/Topband/2007-09/msg00062.html (7,335 bytes)

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