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1. Topband: Stew Perry 97 (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Wed, 1 Jan 2003 08:23:17 -0800; I believe SP 1997 is the same year that WA6CDR was working Europe QRP from Mt. Wilson above Los Angeles. I can also recall operating CQ Worldwide in low sunspot years from KS8S/AD8P in Ohio (c 1985); /archives//html/Topband/2003-01/msg00005.html (6,949 bytes)
2. Topband: ANC-4 noise canceller (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Tue, 3 Dec 2002 22:42:32 -0800; Just be sure you leave the unit off when you are adjusting your antenna tuner. The RF sensing circuit didn't like the wide impedance swings when I swept the capacitors on my Dentron T network and en; /archives//html/Topband/2002-12/msg00051.html (9,139 bytes)
3. Topband: Re: [Towertalk] Back-To-Back Diodes - Careful!! (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Wed, 4 Dec 2002 11:34:24 -0800; Hey wait a minute, Ward, my posting you snipped was to Topband not Towertalk.You are getting me all confused :) Yes you are correct, that is a danger with back-to-back diodes. In our case we were doi; /archives//html/Topband/2002-12/msg00060.html (8,766 bytes)
4. Topband: K9AY Loop Revisited (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Wed, 11 Dec 2002 20:22:16 -0800; know Yes. At 150' your feedline loss will be small, even with RG-58, so it shouldn't make too much difference. You may need a pre-amp depending on your rig. At the local club station where we have a; /archives//html/Topband/2002-12/msg00182.html (12,447 bytes)
5. Topband: stripping enameled wire (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Tue, 17 Dec 2002 12:49:08 -0800; If you need to do a lot striping, get yourself a solder pot. This will burn off the enamel and tin the wire end all in one shot. Very handy if your building filters with air wound inductors, etc. 73; /archives//html/Topband/2002-12/msg00223.html (7,907 bytes)
6. Re: [Towertalk] RE: Topband: stripping enameled wire (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 18 Dec 2002 19:34:11 -0800; I recall using Methylene Chloride a number of years ago for this purpose, but I noticed recently that its been banned (at least a my workplace). Mike, W4EF............................................; /archives//html/Topband/2002-12/msg00324.html (13,628 bytes)
7. Topband: Inverted L Directivity (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Mon, 11 Nov 2002 07:42:02 -0800; The human body has a very small absorption cross section at 1.8 MHz ( IOW, we humans make lousy 160 meter antennas). As a result you only have to be a few feet away from a 160 meter antenna when runn; /archives//html/Topband/2002-11/msg00048.html (8,186 bytes)
8. Topband: FT-1000D External Receive (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Thu, 14 Nov 2002 19:24:24 -0800; We are about to install a pair of K9AY loops at the local club station and were wondering if the FT-1000D requires any special care with respect to front-end protection when using the external receiv; /archives//html/Topband/2002-11/msg00085.html (7,376 bytes)
9. Topband: FT-1000D External Receive (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sat, 16 Nov 2002 15:17:54 -0500; Thanks to everyone for all of the replies. I stopped by the club yesterday and looked at the FT-1000D schematic. Near as I can tell, Yaesu doesn't open or short the external RX port during transmit.; /archives//html/Topband/2002-11/msg00099.html (7,206 bytes)
10. Topband: Center support on K9AY Loop (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Thu, 21 Nov 2002 05:10:21 -0500; Tom and Tom: FWIW, I have been modeling a set of K9AY loops with EZNEC. My modeling results (real high-accuracy ground - average conductivity) indicate that their is only a slight difference (about 2; /archives//html/Topband/2002-11/msg00119.html (8,408 bytes)
11. Topband: Center support on K9AY Loop (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Thu, 21 Nov 2002 15:53:21 -0500; Any suggestions for how to go about decoupling a nearby tower from a K9AY loop array, Tom? My modeling suggests that this may be a problem, but I am not sure if I trust my results. The amount of patt; /archives//html/Topband/2002-11/msg00123.html (9,141 bytes)
12. Topband: Center support on K9AY Loop (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Fri, 22 Nov 2002 06:51:51 -0500; According to the EZNEC manual, whenever you insert the direct connection with the Sommerfield ground, NEC inserts an unknown series resistance. If I switch to real mininec ground, I don't get any war; /archives//html/Topband/2002-11/msg00133.html (8,427 bytes)
13. Topband: Center support on K9AY Loop (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sun, 24 Nov 2002 10:09:04 -0800; Tom, Actually there is no gamma arm currently. We are not shunt feeding the 45G tower (yet). The TX antenna is a low 160 meter dipole that is sitting at the edge of the cliff another 100' or so in t; /archives//html/Topband/2002-11/msg00148.html (8,686 bytes)
14. Topband: Full Moon, Oct 21-Questions (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Fri, 18 Oct 2002 22:30:54 -0700; I agree, Ted. I think the number of stations we work oftentimes has more to do with activity level than propagation. Contests are a good example. A seemingly dead band will oftentimes come to life at; /archives//html/Topband/2002-10/msg00075.html (8,117 bytes)
15. Topband: Source of terminator resistors for EWE's? (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Wed, 30 Oct 2002 06:03:50 -0500; Eric, Digi-Key sells 1 and 2 watt ceramic composition resistors that are joule rated (50 to 80 joules) and carry a 500 to 700 VAC voltage rating. Do a search for the OX/OY series resistors on their w; /archives//html/Topband/2002-10/msg00163.html (7,410 bytes)
16. Topband: chicken wire ground screen (reply) (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Mon, 2 Sep 2002 06:13:31 -0700; Skin depth for zinc is ~.0035 inch at 1.8 MHz, so there will be some benefit due to the galvanized coating depending on its thickness (but probably not too much). Also, eddy currents would generally; /archives//html/Topband/2002-09/msg00013.html (8,259 bytes)
17. Topband: Collins R390 and 75A4 on 160m (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sat, 03 Aug 2002 10:22:51 +0100; When I enquired about the 75A4 some time ago, several people replied that despite its reputation, it has very poor dynamic range (see the following message). I don't know about the R390. 73 de Mike,; /archives//html/Topband/2002-08/msg00018.html (8,654 bytes)
18. Topband: Ground screen (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Wed, 28 Aug 2002 18:22:14 -0700; Howard, How are you bonding the sections of wire together electrically? I bought a new house a few months ago and was thinking about putting down a ground screen before any of the lawn/plants are put; /archives//html/Topband/2002-08/msg00110.html (6,468 bytes)
19. Topband: chicken wire ground screen (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sat, 31 Aug 2002 22:02:16 -0400; What is the consensus on the longevity of galvanized screen versus copper radials? I am about to move to a small lot (50 x 100) which is mostly covered with house (40 x 50) and I need to try to figur; /archives//html/Topband/2002-08/msg00128.html (8,147 bytes)
20. Topband: QRP DX (score: 1): Author: W4EF@dellroy.com (Michael Tope); Date: Sun, 30 Jun 2002 02:58:00 +0100; Hi Riccardo, Several years ago, there was a good opening between Southern California and Europe on 160 meters. Robin, WA6CDR was operating from Mt. Wilson (5000 feet above sea level) and was able to; /archives//html/Topband/2002-06/msg00066.html (7,993 bytes)

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