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1. Re: Topband: Trees And RF - Suggested Test (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Tue, 03 Nov 2009 15:28:22 -0500; I remember reading, somewhere on the net, a US Army contractor paper on the subject of using trees as radiators, by using such a solenoid to couple RF to the trunk. IIRC this was for special ops in t; /archives//html/Topband/2009-11/msg00065.html (9,235 bytes)
2. Re: Topband: Noise Cancellation Options? (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Thu, 01 Oct 2009 09:25:12 -0400; The DX Engineering unit designed by W8JI has been reported by many to work better than either MFJ. But don't all such units depend on there being single sources of noise? If you have multiple sources; /archives//html/Topband/2009-10/msg00004.html (9,628 bytes)
3. Topband: Low-band receiving antenna article at the Contesting Compendium (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Mon, 28 Sep 2009 07:22:45 -0400; A great article by K3NA and W2VJN has just been republished on the Contesting Compendium. See <http://wiki.contesting.com/index.php/VP6DX_receiving_antennas>. At first blush, you might wonder "what's; /archives//html/Topband/2009-09/msg00149.html (7,884 bytes)
4. Re: Topband: Need assistance with 160m Marconi (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sun, 20 Sep 2009 09:50:18 -0400; Indeed ... I have a 500w watt local station on 1550 KHz about 5 miles from me, and my MFJ-259 was completely useless on 160. I hauled my TS-930 out to the base of the antenna and had the match adjust; /archives//html/Topband/2009-09/msg00086.html (9,233 bytes)
5. Re: Topband: Need assistance with 160m Marconi (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 19 Sep 2009 17:04:43 -0400; That smells like a shorted connector and a long feedline to me. 73, Pete N4ZR New Articles Daily - the Contesting Compendium at http://wiki.contesting.com The World Contest Station Database, updated; /archives//html/Topband/2009-09/msg00082.html (9,346 bytes)
6. Topband: Voltage rating of matching capacitor(s) (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Fri, 24 Jul 2009 05:58:55 -0400; My shunt-fed tower requires an Omega match in order to get a good feedpoint SWR. My current Omega match has 3000-volt air variables in both positions. I understand the calculation for the voltage acr; /archives//html/Topband/2009-07/msg00108.html (10,747 bytes)
7. Topband: center-tapped common mode choke (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Mon, 06 Jul 2009 16:16:10 -0400; In response to all the curiosity and commentary about the ON4UN choke arrangement, I have added some material quoted from his Low-Band Dxing, 4th edition, at the end of the writeup <http://wiki.conte; /archives//html/Topband/2009-07/msg00022.html (7,487 bytes)
8. Re: Topband: Common mode chokes (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sun, 05 Jul 2009 05:21:38 -0400; Inteesting. Are your assumptions changed by the presence of the amplifier at the base of the whip, which is designed to match to 75-ohm cable? I will give the beadless version a try. 73, Pete N4ZR __; /archives//html/Topband/2009-07/msg00016.html (11,720 bytes)
9. Re: Topband: Common mode chokes (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sun, 05 Jul 2009 05:17:45 -0400; I wasn't aware that W2DU had developed the "center-tapped" approach, as opposed to the basic idea of the bead-type current balun. As explained on the lab notebook page, I tested with and without the; /archives//html/Topband/2009-07/msg00015.html (10,250 bytes)
10. Re: Topband: Common mode chokes (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 04 Jul 2009 16:33:27 -0400; These are fair points, Jim. One of the purposes if this series of tests is to see if Clifton Labs' super-duper center-tapped choke, which combines 2 different wound cores on each side of the center g; /archives//html/Topband/2009-07/msg00009.html (9,834 bytes)
11. Topband: "Center-tapped" common mode choke (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 04 Jul 2009 13:49:45 -0400; Apologies for being less than clear - the choke that gave the much better results was built on the inspiration of ON4UN's low-band DXing book, 4th edition, figures 7-88. A length of RG-59 coal is use; /archives//html/Topband/2009-07/msg00006.html (7,548 bytes)
12. Topband: Common mode chokes (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 04 Jul 2009 10:16:23 -0400; I thought readers here might be interested in some crude experiments I have been doing here with a Clifton Labs active antenna and various common mode choking schemes. It's conventional wisdom that s; /archives//html/Topband/2009-07/msg00003.html (7,848 bytes)
13. Re: Topband: Beverage Feed Line Choke Installation (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Wed, 03 Jun 2009 08:06:10 -0400; What I intend to do shortly is use spectrum analyzer software and an SDR-IQ to look at several different alternatives. Still eyeball, but at least it's the whole band at once. I'll be testing the ON4; /archives//html/Topband/2009-06/msg00023.html (8,592 bytes)
14. Re: Topband: Beverage Feed Line Choke Installation (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Mon, 01 Jun 2009 08:11:53 -0400; DXE's pricing is a clear example of charging what you can get, rather than some reasonable multiple of manufacturing/marketing cost. I was startled by their Dayton display showing all the DXE gadgets; /archives//html/Topband/2009-06/msg00003.html (8,824 bytes)
15. Re: Topband: Beverage Feed Line Choke Installation (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Mon, 01 Jun 2009 06:55:40 -0400; I understand that low-output RX antennas like flags, pennants, and various loops need more common mode suppression than Beverages. I wonder if two of those chokes, with a ground in between, 10-15 fee; /archives//html/Topband/2009-06/msg00002.html (8,954 bytes)
16. Topband: Probably-dumb question re current mode chokes on RX antennas (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Mon, 18 May 2009 16:12:22 -0400; I think I understand that common mode chokes are important on small loops and other low-output receiving antennas, in order to prevent signals being received on the shield of the feedline and passed; /archives//html/Topband/2009-05/msg00073.html (7,894 bytes)
17. Re: Topband: Receive Splitter or Not? (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Tue, 24 Mar 2009 07:44:23 -0400; It depends ... (helpful answer, right?). For example, I have had various SDRs connected to the RX antenna loop on my two transceivers. One of them did not load the RX inputs at all, while my current; /archives//html/Topband/2009-03/msg00070.html (8,281 bytes)
18. Topband: thanks for RX antenna advice - and one more question (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Wed, 04 Mar 2009 06:54:05 -0500; Thanks to the many topband denizens who responded to my inquiry. I have one related question. KD9SV, who knows a lot about receiving antennas, cautioned "I would just make sure to switch 'both sides; /archives//html/Topband/2009-03/msg00008.html (7,379 bytes)
19. Topband: RX antenna switching (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Tue, 03 Mar 2009 10:34:35 -0500; An elementary question but -- If I want to switch a topband RX antenna among three radios, can I just use an ordinary rotary switch, without special attention to maintaining impedance, etc. 73, Pete; /archives//html/Topband/2009-03/msg00003.html (6,498 bytes)
20. Re: Topband: Receiving beacon on 1836.36 kHz (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Thu, 19 Feb 2009 21:15:00 -0500; In the same spirit, since I will not be operating after dark in the upcoming ARRL contest, I will put my SDR-IQ/CW Skimmer combination on 160 meters all night (US East Coast, GMT+5), reporting what i; /archives//html/Topband/2009-02/msg00116.html (8,272 bytes)

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