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41. Re: Topband: 9 circle array (score: 1)
Author: "John Kaufmann" <jkaufmann@alum.mit.edu>
Date: Tue, 08 Dec 2015 07:23:42 -0500
73, John W1FV --Original Message-- From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of John Kaufmann Sent: Monday, December 07, 2015 8:34 PM To: 'Glenn Biggerstaff'; topband@contesting
/archives//html/Topband/2015-12/msg00117.html (7,590 bytes)

42. Re: Topband: 160M EWE Problems (score: 1)
Author: "John Kaufmann" <jkaufmann@alum.mit.edu>
Date: Thu, 10 Dec 2015 20:34:54 -0500
be working right. The YCCC array and other high-performance receiving arrays have much higher directivity, and correspondingly higher RDF's, than a K9AY loop. On 160m, the YCCC array has an RDF of 1
/archives//html/Topband/2015-12/msg00140.html (8,953 bytes)

43. Re: Topband: Cutting Delay Lines (score: 1)
Author: "John Kaufmann" <jkaufmann@alum.mit.edu>
Date: Wed, 13 Jul 2016 09:48:21 -0400
In principle, any *odd* multiple of 4.118 MHz (the frequency where the cable is 1/4 wavelengths long) will work when the far end of the cable is open-circuited. If you short-circuit the far end of th
/archives//html/Topband/2016-07/msg00014.html (8,069 bytes)

44. Re: Topband: active antenna height (score: 1)
Author: "John Kaufmann" <jkaufmann@alum.mit.edu>
Date: Fri, 26 Aug 2016 20:06:23 -0400
A while back, while designing my own "active" receiving array of short verticals, I did a NEC-4 analysis of how the behavior of a very short nonresonant vertical varied with height. The vertical I mo
/archives//html/Topband/2016-08/msg00047.html (9,161 bytes)

45. Re: Topband: active antenna height (score: 1)
Author: "John Kaufmann" <jkaufmann@alum.mit.edu>
Date: Fri, 26 Aug 2016 21:58:22 -0400
Lee, The NEC-4 analysis is based strictly on gain and does not take into account the loading of any amplifier input capacitance, which can modify the scaling of signal level obtained at the output of
/archives//html/Topband/2016-08/msg00049.html (11,516 bytes)

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