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1. RE: Topband: Choosing between a Receiver Noise Bridge and anAntennaBridge (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Tue, 13 Jan 2004 09:45:02 -0800; Hello George I've used the noise bridge method, and a couple of different antenna analyzers. Here's what I've found so far. NOISE BRIDGE. You need a known 50 ohm load to calibrate it. One assumes suc; /archives//html/Topband/2004-01/msg00124.html (10,037 bytes)
2. RE: Topband: Low Bands Rx aerial (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Wed, 7 Jan 2004 10:20:02 -0800; Alan The distinguishing feature of the Carolina Windom is the radiating vertical feeder. If you have it so low that that section is on the ground, you might as well just go with a conventional low di; /archives//html/Topband/2004-01/msg00084.html (8,281 bytes)
3. RE: Topband: DC Motor for turning Capacitor? (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Sat, 3 Jan 2004 15:26:57 -0800; Hi Pat I bought a 12v dc motor with reduction gearing from Jameco. It was about $20 as I recall. It can run on down to around 5 or 6 volts, just slower. Makes a nice way to fine adjust your tuning. G; /archives//html/Topband/2004-01/msg00032.html (8,346 bytes)
4. RE: Topband: MFJ-1026 noise canceller (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Tue, 30 Dec 2003 14:48:43 -0800; Jim Both the ANC-4 and the MFJ-1026 have provision for an external input to handle the TR switching. If your rig provides a switched ground output, it can be used to the switch the noise canceller in; /archives//html/Topband/2003-12/msg00306.html (8,400 bytes)
5. RE: Topband: Beverage w/ground simulation (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Mon, 29 Dec 2003 21:46:21 -0800; Don, and anyone else who has an opinion, what about connecting a ground wire under the beverage. Run it across the canyon, grounded at both ends. Use non-conducting string, whatever, to keep it a fai; /archives//html/Topband/2003-12/msg00278.html (8,643 bytes)
6. RE: Topband: Receiving Loops (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Mon, 29 Dec 2003 09:57:50 -0800; Thomas If you go to the trouble of putting your loop on top of a tower, be sure to add a rotator. this will allow you to use the loop's null to reduce the noise as much as possible. 73, Bob N6WG --Or; /archives//html/Topband/2003-12/msg00267.html (8,171 bytes)
7. RE: Topband: Receiving Loops (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Sun, 28 Dec 2003 16:28:17 -0800; Kevin Last winter I experimented with some homebrew indoor loops to see what they might do for me. Unfortunately, results were inconclusive, as I set them up in an unfavorable location. Instead of gr; /archives//html/Topband/2003-12/msg00249.html (8,786 bytes)
8. Topband: Stew Perry contest ideas (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Sun, 21 Dec 2003 19:59:46 -0800; With the SP coming up, I'm looking for a little discussion on strategy. We only get to operate 14 of the hours, so there is some opportunity to optimize the hours one uses. Here on the left coast, th; /archives//html/Topband/2003-12/msg00177.html (6,866 bytes)
9. Topband: Repost: 160m balun (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Sat, 20 Dec 2003 21:29:32 -0800; Bill Tippett says this message went astray somehow, so here it is again. Tom For the air-wound balun on my 160m vertical, I used a plastic laundry detergent tub. It is slightly tapered, so each turn; /archives//html/Topband/2003-12/msg00172.html (7,052 bytes)
10. RE: Topband: 160/80 Meter Vertical Performance Over PoorSoilConductivity (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Sat, 20 Dec 2003 21:15:15 -0800; Ron "I believe the conductivity is probably not that good. There appears to be only about 6 inches of soil on top of rock." Your situation sounds similar to a fellow who tried verticals in the desert; /archives//html/Topband/2003-12/msg00171.html (7,776 bytes)
11. RE: Topband: mediocre beverages or K9AY loop? (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Wed, 19 Nov 2003 11:57:41 -0800; Dave Another possibility would be a Flag receiving loop. The pattern is cardioid, but it is reversible. So an east facing loop could also beocme a west facing loop. 73, Bob N6WG Being new to topband,; /archives//html/Topband/2003-11/msg00147.html (8,734 bytes)
12. RE: Topband: Autek VA1 Users/Owners ?? (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Tue, 18 Nov 2003 21:48:38 -0800; Hi Mike I have the VA-1 and the AEA HF-CIA analyzers. I use them both, but they don't tell the same story if you get very far from a low swr situation. Once you get over about a 4:1 swr, the accuracy; /archives//html/Topband/2003-11/msg00138.html (8,052 bytes)
13. RE: Topband: measuring transformer core inductance (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Thu, 13 Nov 2003 19:17:25 -0800; Steve To measure inductance at the frequency of use, I use either of two instruments. I have the Autek VA-1 and the AEA HF-CIA antenna analyzers. This method would work with the MFJ anatenna analyzer; /archives//html/Topband/2003-11/msg00105.html (9,448 bytes)
14. RE: Topband: Antenna on small lot (score: 1): Author: "Bob Tellefsen" <n6wg@earthlink.net>; Date: Sat, 27 Sep 2003 13:12:38 -0700; Hello Hal I'm on the edge of San Francisco Bay, way over on the left edge of things. The antenna here is a 50-ft top-loaded wire vertical. The top loading is a homebrew airwound coil and 5 30-ft top; /archives//html/Topband/2003-09/msg00127.html (8,142 bytes)
15. Topband: Flag Xfmr Measurements End Game (score: 1): Author: n6wg@earthlink.net (Bob Tellefsen); Date: Sun, 22 Sep 2002 17:18:54 -0700; Well, after fighting a single-core solution to the problem, I decided to break it down into smaller bits. I now have one small binocular core transformer, made from two small toroids, that gives me a; /archives//html/Topband/2002-09/msg00160.html (7,772 bytes)
16. Topband: Vertical Ant Feedpoint -- Distance from Earth (score: 1): Author: n6wg@earthlink.net (Bob Tellefsen); Date: Sun, 15 Sep 2002 13:29:10 -0700; Larry If you have a ground-mounted radial system, then the shield of the coax should be connected to it. If you move the feedpoint up the vertical by any amount, the shield is no longer at ground pot; /archives//html/Topband/2002-09/msg00130.html (7,863 bytes)
17. Topband: Flag Xfmr Measurements (score: 1): Author: n6wg@earthlink.net (Bob Tellefsen); Date: Wed, 11 Sep 2002 16:19:53 -0700; I've been curious about the insertion loss of the 50:900 ohm matching transformers we wind for the Flag antenna, especially with the "unofficial" toroid cores I use. So I did a bit of investigating.; /archives//html/Topband/2002-09/msg00114.html (8,928 bytes)
18. Topband: chicken wire ground screen (score: 1): Author: n6wg@earthlink.net (Bob Tellefsen); Date: Sun, 01 Sep 2002 06:29:41 -0400; Hello Mike Here's one variation you might consider. Like you, I have a small lot, 60 wide by 100 ft long. The back yard is 60 by 24, and my 160m vertical is in the center of my back fence. I've arran; /archives//html/Topband/2002-09/msg00005.html (8,174 bytes)
19. Topband: Top loading coil (score: 1): Author: n6wg@earthlink.net (Bob Tellefsen); Date: Sat, 17 Aug 2002 18:01:15 -0700; I recently took down my 160m vertical so I could put up a taller mast. I got a good look at the coil after being out in the elements for one year. The coil was wound with 1/8" diameter copper tubing,; /archives//html/Topband/2002-08/msg00044.html (7,144 bytes)
20. Topband: UK: Balloon antennas, where to get balloon and gas (score: 1): Author: n6wg@earthlink.net (Bob Tellefsen); Date: Mon, 06 May 2002 10:04:39 +0100; Herb Two questions for you. These may be outdated, but I'll ask anyway. I've heard that the gas molecules for hydrogen are much smaller than helium, and that the gas bag must be much less porous. Wil; /archives//html/Topband/2002-05/msg00064.html (7,536 bytes)

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