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1. Topband: Tracking noise (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sun, 01 Dec 2002 08:07:05 +0000; I have found one of the most effective tools for tracking down line noise and electric fence QRM is a little hand-held portable radio from Radio Shack. It has the AM broadcast band, FM and "aircraft"; /archives//html/Topband/2002-12/msg00000.html (7,759 bytes)
2. Topband: MFJ noise canceller (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Wed, 04 Dec 2002 18:32:36 +0000; I purchased a MFJ noise canceller at Dayton this past year. I haven't played with it much, but my first impression was a substantial reduction in s/n ratio with the signal going through the thing. It; /archives//html/Topband/2002-12/msg00058.html (7,512 bytes)
3. Topband: 4. MFJ noise canceller (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sun, 08 Dec 2002 05:00:37 +0000; I took some measurements today with my MFJ 1025, using a General Radio 1001-A rf signal generator, an external calibrated attenuator and a 75A4 receiver. The built-in attenuator setting were compared; /archives//html/Topband/2002-12/msg00109.html (8,445 bytes)
4. Topband: Signal on 1907.2 (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sun, 17 Nov 2002 08:14:31 +0000; For the past several days I have been hearing a moderately strong hum-modulated carrier on 1907.2 kHz. It is inaudible during the day and there is fading on the signal, so it is apparently not spurio; /archives//html/Topband/2002-11/msg00101.html (6,843 bytes)
5. Topband: Center support on K9AY Loop (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sun, 24 Nov 2002 21:44:39 +0000; Looking over both QST articles, it seems to me that the K9AY loop is nearly identical to the diamond or delta version of the flag/pennant. The main difference is the location of the feed point and te; /archives//html/Topband/2002-11/msg00150.html (8,556 bytes)
6. Topband: "Magic" lamp QRM (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sat, 05 Oct 2002 21:44:43 +0000; I recently noticed a very rough, broad signal that wipes out 30-kHz portions of the spectrum from the middle of the broadcast band through 10 m. It is especially bad on 160 and 80m. I did a little sn; /archives//html/Topband/2002-10/msg00015.html (8,658 bytes)
7. Topband: Radial wire selection and installation (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sat, 07 Sep 2002 08:43:27 +0000; It is a matter of using the correct solder. Lead/tin in contact with the soil will quickly disintegrate into a white powder. I once tried it, and had to resolder all the connections every couple of; /archives//html/Topband/2002-09/msg00060.html (9,235 bytes)
8. Topband: What's the minimum distance one shud have between vertical andbeverage? (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sun, 08 Sep 2002 19:07:55 +0000; My Beverage runs almost tangent to the circle formed by the ends of the radials (120 quarter wave #12 bare soft-drawn copper wires buried 1-2 inches in the soil). Thus the Beverage wire is a little; /archives//html/Topband/2002-09/msg00072.html (8,100 bytes)
9. Topband: Radial wire installation (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Wed, 11 Sep 2002 00:48:29 +0000; This got me thinking. I went out to the tower Sunday afternoon and dug through the soil to the termination point of my radial system. It consists of heavy gauge 1 1/2" wide copper strap in a rectang; /archives//html/Topband/2002-09/msg00105.html (7,809 bytes)
10. Topband: Coupling of bev to tx system (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Wed, 11 Sep 2002 04:27:08 +0000; With a series fed vertical on a base insulator, you should be able to disconnect the antenna, leaving the mast floating (if it is 1/4 wavelength or less), and compare the noise in the rx antenna. If; /archives//html/Topband/2002-09/msg00108.html (7,611 bytes)
11. Topband: Vertical Antenna Feedpoint Above Ground - Part Deux (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Tue, 17 Sep 2002 03:53:15 +0000; My tuning unit is in a protective box about 6' away from the base insulator and tower base. 120 radials terminate to a heavy gauge 1 1/2" copper strap that surrounds the concrete tower base. The tun; /archives//html/Topband/2002-09/msg00137.html (9,649 bytes)
12. Topband: Buried radials (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sun, 22 Sep 2002 09:30:54 +0000; Alan, I'm not sure how effective the radials would be if buried that deep. They need to be on or just below the surface. The purpose of the radial system is to shield the radiating vertical element; /archives//html/Topband/2002-09/msg00155.html (7,679 bytes)
13. Topband: Radials around house (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sat, 28 Sep 2002 09:05:29 +0000; The standard method used by the broadcast industry is to run a copper strap in a closed loop around the perimeter of the building. Terminate radials to the strap, then on the opposite side of the bui; /archives//html/Topband/2002-09/msg00203.html (7,614 bytes)
14. Topband: Part 15 Alert (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Thu, 01 Aug 2002 19:01:09 +0000; To all topbanders: I checked the final comments on Docket 02-98 last night, before starting on my reply comments. It looks like the greatest threat to amateur radio right now is NOT shortwave broadca; /archives//html/Topband/2002-08/msg00002.html (9,455 bytes)
15. Topband: R-390 rcvrs..... (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sat, 03 Aug 2002 21:38:56 +0000; The '390/390A and the 51J4 have little in common, except for the general coverage feature and Collins PTO/tuneable i.f. scheme. The J4 looks like a general coverage version of a 75A4, but the conver; /archives//html/Topband/2002-08/msg00020.html (7,815 bytes)
16. Topband: Unwanted sginals and noise (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sat, 24 Aug 2002 17:48:13 +0000; My Beverage uses a toroidal transformer with separate primary and secondary. I ground the primary (antenna input)winding to a ground rod surrounded by a mini radial system of about 10 radials about 1; /archives//html/Topband/2002-08/msg00074.html (7,675 bytes)
17. Topband: Silent Feedline for RX antennas (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Sat, 24 Aug 2002 19:55:17 +0000; I have seen rolls of "double barrel" coax at hamfests. It has two separate parallel inner conductors instead of one. Sort of like shielded twin lead. I forget the RG number, but it might be a better; /archives//html/Topband/2002-08/msg00080.html (8,525 bytes)
18. Topband: Diversity Reception on 160 (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Tue, 02 Jul 2002 05:06:29 +0000; What techniques are used for diversity reception with CW or SSB? I am familiar with AM diversity, where the agc's of the receivers are tied together and the audio outputs are combined and fed into on; /archives//html/Topband/2002-07/msg00006.html (8,216 bytes)
19. Topband: Manually Switching in Extra Antenna Length (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Wed, 03 Jul 2002 04:58:09 +0000; One possibility might be to use a mechanical knife switch at the top of the mast, and use two control lines made of some non-conductive material that does not stretch, connected to a rocker arm mech; /archives//html/Topband/2002-07/msg00019.html (7,758 bytes)
20. Topband: Ameco PCL-P preamp (score: 1): Author: k4kyv@hotmail.com (Donald Chester); Date: Thu, 11 Jul 2002 02:55:32 +0000; Speaking of Amecon preamps, I have an Ameco PCL-P nuvistor cascode preamp. It seems to work ok on 160-10m. I find it useful with my K6STI loop and for using my 10m ground plane as a general coverage; /archives//html/Topband/2002-07/msg00058.html (7,251 bytes)

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