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1. TopBand: Beacon? (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Fri, 08 Jan 1999 08:20:57 +1100; This sounds like a fishnet beacon, left to mark the position of a long line net. They are illegal, but widely sold and used nevertheless. They are low power (a few watts), and have been reported from; /archives//html/Topband/1999-01/msg00063.html (7,376 bytes)
2. TopBand: Re: PC monitor noise suppression (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Wed, 25 Nov 1998 09:19:11 +1100; Just got back from overseas, hence the delay. Make sure the monitor uses a power cable which plugs into the PC, not a separate wall outlet. This will confine the monitor RFI currents to the loop betw; /archives//html/Topband/1998-11/msg00165.html (8,229 bytes)
3. TopBand: Pennant f/b ratio (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Fri, 02 Oct 1998 10:10:51 +1000; [MODERATOR NOTE: You can requst the ZIP file from the author. It has been deleted from this message.] Intrigued by the observations of Earl K6SE on pennant antennas, regarding f/b ratios ranging from; /archives//html/Topband/1998-10/msg00011.html (9,354 bytes)
4. TopBand: Re: Loops and preamplifiers (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Sun, 04 Oct 1998 12:42:21 +1000; Yes. Every dB of improved matching is 1 dB lower system noise figure. You can compensate for poor matching to a certain degree, by adding more preamplifier gain, but depending on the external noise l; /archives//html/Topband/1998-10/msg00016.html (8,143 bytes)
5. TopBand: Re: A really quiet location (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Sat, 10 Oct 1998 10:33:56 +1000; It's amazing how often you hear of low antennas giving better SNR, and not just for brief periods around sunrise, as discussed (and explained) here several weeks ago. How is this so, when low angle D; /archives//html/Topband/1998-10/msg00046.html (8,701 bytes)
6. TopBand: Re: Spurii (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Fri, 16 Oct 1998 08:18:39 +1000; These are probably being generated in the neighbourhood, arriving through power line conduction, and magnetically coupled into the beverage. There is no way to shield a beverage from a local magnetic; /archives//html/Topband/1998-10/msg00073.html (7,834 bytes)
7. TopBand: Re: Interference problems (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Sat, 17 Oct 1998 09:46:33 +1000; Hi Tom, Further to the advice of Ward and Tom (W8JI) on what might be causing the IMD in your system, I suggest checking its coaxial adaptors, specifically any BNC and UHF 90 degree bends and T piece; /archives//html/Topband/1998-10/msg00080.html (8,751 bytes)
8. TopBand: CQ 160 Rules (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Tue, 08 Sep 1998 06:56:24 +1000; Re 160 contest: Please no grid squares - it's hard enough getting callsigns through on long haul QSOs from VK, at least for those of us not blessed with tree burners and acre sized properties. What's; /archives//html/Topband/1998-09/msg00045.html (7,979 bytes)
9. TopBand: Transformers for pennants and flags (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Tue, 15 Sep 1998 09:06:29 +1000; Recent discussions have highlighted the need for good transformer balance and low interwinding capacitance, for the matching transformers used for pennants and flags. Further examination shows that t; /archives//html/Topband/1998-09/msg00087.html (13,477 bytes)
10. TopBand: Transformers for pennants and flags (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Tue, 15 Sep 1998 09:06:29 +1000; Recent discussions have highlighted the need for good transformer balance and low interwinding capacitance, for the matching transformers used for pennants and flags. Further examination shows that t; /archives//html/Topband/1998-09/msg00088.html (13,455 bytes)
11. TopBand: More on transformers (score: 1): Author: pnesbit@melbpc.org.au (P&V Nesbit); Date: Thu, 17 Sep 1998 09:01:45 +1000; Thanks to everyone for the feedback regarding antenna transformers, which is very encouraging. Several people have since asked about transformers for beverages, and since the answer is probably of ge; /archives//html/Topband/1998-09/msg00112.html (11,020 bytes)
12. TopBand: Pennant antenna (score: 1): Author: pnesbit@melbpc.org.au (P & V Nesbit); Date: Tue, 04 Aug 1998 08:38:03 +1000; My thanks to Earl K6SE for publicising the Pennant antenna, which is reminiscent of a short terminated vee or half-rhombic. It is actually a very logical progression, come to think of it! I was about; /archives//html/Topband/1998-08/msg00050.html (7,685 bytes)
13. TopBand: Rotary Flag? (score: 1): Author: pnesbit@melbpc.org.au (P & V Nesbit); Date: Mon, 10 Aug 1998 22:51:05 +1000; For a space-efficient receiving antenna, what about a rotary Flag? It could use aluminium tubing for the 29' horizontal sections, with the whole thing supported from a single pole at the centre. To f; /archives//html/Topband/1998-08/msg00097.html (7,875 bytes)
14. TopBand: Re: N5KO/HC8 (score: 1): Author: pnesbit@melbpc.org.au (P & V Nesbit); Date: Sat, 04 Jul 1998 11:00:30 +1000; The VK3 was probably me. Derek had a good signal here, but disappeared after five minutes, even though his signals (to the west) were still building up. I'll have another listen tonight (i.e. Sat mor; /archives//html/Topband/1998-07/msg00009.html (7,148 bytes)
15. TopBand: 160m Intruders (score: 1): Author: pnesbit@melbpc.org.au (P & V Nesbit); Date: Wed, 08 Jul 1998 07:49:21 +1000; Tonight (Tuesday) was as poor as last night was good (i.e. no DX at all). However I did hear the following stations, ranging in strength from 569 to 599, between 1030 and 1130z: "CS3" on 1832 "3DTQ"; /archives//html/Topband/1998-07/msg00024.html (7,529 bytes)
16. TopBand: Re: 160m Intruders (score: 1): Author: pnesbit@melbpc.org.au (P & V Nesbit); Date: Sat, 11 Jul 1998 17:34:55 +1000; Many thanks to all those who responded with information about the floating beacons. It seems they cause widespread problems, and I'll be following ZL2JR's lead in reporting them here. Maybe with enou; /archives//html/Topband/1998-07/msg00041.html (7,525 bytes)
17. TopBand: Re: GP vs vertical dipole (score: 1): Author: pnesbit@melbpc.org.au (P & V Nesbit); Date: Thu, 18 Jun 1998 08:21:47 +1000; My money is on the vertical dipole, because the high current area will be well above ground. This will reduce the look angle and minimise the ground losses. I wouldn't worry about the tower being gro; /archives//html/Topband/1998-06/msg00037.html (8,423 bytes)
18. TopBand: Re: Measuring impedances through a filter (score: 1): Author: pnesbit@melbpc.org.au (P & V Nesbit); Date: Wed, 24 Jun 1998 22:00:28 +1000; At 09:42 23/06/1998 +0000, Tom W8JI wrote (re using a filter ahead of an impedance analyzer): Quite true, however this problem is easily resolved. Assuming the filter is home brew, feed the component; /archives//html/Topband/1998-06/msg00073.html (8,251 bytes)
19. TopBand: Re: Measuring impedances through a filter (score: 1): Author: pnesbit@melbpc.org.au (P & V Nesbit); Date: Thu, 25 Jun 1998 20:13:48 +1000; This is just what I proposed. I never suggested physical substitution, because that is what programs like Radio Designer are supposed to free us from! Perhaps I didn't make this point clear enough. T; /archives//html/Topband/1998-06/msg00081.html (8,347 bytes)
20. TopBand: 160m 4-square (score: 1): Author: pnesbit@melbpc.org.au (Peter Nesbit VK3APN); Date: Sat, 08 Feb 1997 08:40:40 +1000; (snip) The answers are evident from theory. Buried radials behave partly as resonant structures, and partly as travelling wave structures. The less energy is reflected from the ends of the radials ba; /archives//html/Topband/1997-02/msg00104.html (8,982 bytes)

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