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21. [Towertalk] Inv L (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 10 Jul 2002 04:33:42 -0000; Hi Jim, Have just made a post on this. Based on experience at my end over 15 yrs working from my former QTH which was a townhouse in downtown Auckland. Inverted L on roof with elevated radials (two o; /archives//html/Towertalk/2002-07/msg00259.html (11,513 bytes)
22. [Towertalk] Kevlar Guys (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Mon, 29 Jul 2002 05:19:24 -0000; I wonder if any one on TT has experience using Kevlar line as mast or tower guys? Phillystran (which I believe to be kevlar in some sort of a matrix) is not available out here and would be very expen; /archives//html/Towertalk/2002-07/msg00780.html (8,185 bytes)
23. [Towertalk] Kevlar Guys (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 31 Jul 2002 07:46:49 -0000; Just like to say thanks for all the very informative and helpful replies to my post on this topic. The amateur spirit is alive and well on this reflector. 73 es tnx end Barry Kirkwood PhD ZL1DD Signa; /archives//html/Towertalk/2002-07/msg00842.html (7,399 bytes)
24. [Towertalk] 40m beams (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Sun, 7 Apr 2002 18:11:11 -0000; FWIW Some years back a writer in RSGB Radio Communication magazine gave listening reports of UK 40m signals as heard in Australia. Top ratings went to Cushcraft 40CD or four square arrays. Results ob; /archives//html/Towertalk/2002-04/msg00219.html (7,901 bytes)
25. [Towertalk] Seaside QTH (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 13 Mar 2002 20:14:48 -0000; An interesting thread. In the wonderful "Technical Topics" column in the RSGB mag "Radio Communication" it was mentioned that in the 30s the Brits did statistical surveys of hf communications station; /archives//html/Towertalk/2002-03/msg00191.html (6,879 bytes)
26. [Towertalk] dB (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 19 Mar 2002 03:24:29 -0000; Classical psychophysics has existed as a scientific discipline since the 1830s. In classical psychophysical terms, a dB is the difference in level that an "average" observer can detect on 50% of occa; /archives//html/Towertalk/2002-03/msg00426.html (7,051 bytes)
27. Fw: [TowerTalk] G3FXB Quad (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 20 Feb 2002 21:47:52 -0000; I could not find an email address for Bill, N4AR. Just forwarding this to see if he is on this group, or if anyone could kindly forward this to him. 73 es tnx end Barry Kirkwood PhD ZL1DD Signal Hill; /archives//html/Towertalk/2002-02/msg00582.html (9,676 bytes)
28. [TowerTalk] Horizontal loops (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 4 Sep 2001 21:36:01 +1200; ZL1MH uses a 520 ft approx horizontal square loop at 40ft with great success 80 -10m. I used a similar antenna at a vacation site for some years. No strange problems tuning with Z match tuners were e; /archives//html/Towertalk/2001-09/msg00118.html (7,271 bytes)
29. [TowerTalk] more on horizontal loops (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 4 Sep 2001 21:52:11 +1200; right! modelling such loops at 40ft or so shows that they are very good indeed on 20-15-10. the patterns have lots of nulls but these are not noticable in practice. they beat dipoles at the same heig; /archives//html/Towertalk/2001-09/msg00119.html (7,982 bytes)
30. [TowerTalk] Horizontal loops : Correction (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 5 Sep 2001 16:11:42 +1200; Sorry: I meant that loops outperform dipoles on the High bands, not low bands. Sorry. cheers end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND; /archives//html/Towertalk/2001-09/msg00157.html (7,144 bytes)
31. [TowerTalk] Antennas for small lots (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 5 Sep 2001 16:24:40 +1200; Years ago the late KH6IJ wrote an article in QST relating his experience moving on to a very small lot. He had a tribander at around 30ft and a random wire going up to it and worked against earth for; /archives//html/Towertalk/2001-09/msg00158.html (7,656 bytes)
32. [TowerTalk] Antennas for small lots (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 6 Sep 2001 17:47:35 +1200; RSGB reference: Radio Communications June 1992. Part 1 of 4 part Series 'HF Dx, the inside story' Survey based poll of all UK stations on DXCC Honour Roll at that time. Some had very small lots : one; /archives//html/Towertalk/2001-09/msg00199.html (8,804 bytes)
33. [TowerTalk] Re: [AMPS] True Or Not True #2 (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Fri, 7 Sep 2001 08:24:51 +1200; By definition, from psychophysics, 1dB is the increase or decrease in signal strength that can be discerned by an average observer on 50% of occasions. A 2dB increase should be discernible by an aver; /archives//html/Towertalk/2001-09/msg00230.html (10,252 bytes)
34. [TowerTalk] Re: [AMPS] True Or Not True #2 (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Fri, 7 Sep 2001 10:38:17 +1200; The reason that particular log relationship was chosen was because it gives a tidy fit to differential thresholds for human auditory perception as first outlined by Weber and Fechner ca. 1830. For mo; /archives//html/Towertalk/2001-09/msg00247.html (13,252 bytes)
35. [TowerTalk] Re: [AMPS] True Or Not True #2 (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Fri, 7 Sep 2001 10:45:59 +1200; Psychophysics (roughly defined as the scientific study of the relationship between human and animal perception and physical energies)is a scientific discipline dating back to the 1830s. When you read; /archives//html/Towertalk/2001-09/msg00250.html (9,947 bytes)
36. [TowerTalk] Re: [AMPS] True Or Not True #2 (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Fri, 7 Sep 2001 15:10:13 +1200; Hoho, Well,over the years I have "assisted the court" as an expert witness dealing with just these issues, and yes, some of my best friends are...... The burden of the tale is that a dB is a more or; /archives//html/Towertalk/2001-09/msg00262.html (12,424 bytes)
37. [TowerTalk] antennas for small lots. (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 11 Sep 2001 17:38:52 +1200; For those who are confined to small lots and limited antennas, go to www.qsl.net/fm5gu , press "The bewitched wire" or"FM5GU/I" buttons and take heart. 73 Baz end Barry Kirkwood PhD ZL1DD Signal Hill; /archives//html/Towertalk/2001-09/msg00390.html (7,058 bytes)
38. [TowerTalk] G3FXB Quad (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 13 Sep 2001 09:01:20 +1200; There have been quite a few enquiries about the famous quad used by the late G3FXB. I contacted RSGB Radio Communication magazine and was delighted to get a very prompt reply from the editor saying t; /archives//html/Towertalk/2001-09/msg00418.html (7,160 bytes)
39. [TowerTalk] 5/16 lambda inverted L (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 20 Sep 2001 12:29:22 +1200; I used the configuration of 5/16 L with series C with elevated radials for 80m on the roof my my two story town house some years ago. Performed beyond expectation by comparison with locals and in con; /archives//html/Towertalk/2001-09/msg00560.html (7,271 bytes)
40. [TowerTalk] rope (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 12 Jul 2001 17:34:32 +1200; following the thread about ropes and climbing with great interest. have yet to spend some time at a rock gym learning modern techniques, my experience based on a certain amount of sailing, plus mount; /archives//html/Towertalk/2001-07/msg00207.html (8,079 bytes)

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