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61. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: R L Measures <r@somis.org>; Date: Tue, 29 Aug 2006 22:58:04 -0700; I had trouble getting mine to play on 10m. Did the 813 have a metal anode or a carbon anode? R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing; /archives//html/Amps/2006-08/msg00830.html (10,257 bytes)
62. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: R L Measures <r@somis.org>; Date: Wed, 30 Aug 2006 08:13:40 -0700; During the Grate Parasitics Debate in 1996, a member of the audience hauled his SB-220 to work and loosely coupled the anodes to a HP spectrum analyzer. When the 220 was keyed, he observed damped-wav; /archives//html/Amps/2006-08/msg00832.html (11,893 bytes)
63. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 31 Aug 2006 22:51:49 +0100; Did that, no result. Hence my post. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-08/msg00839.html (11,193 bytes)
64. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: R L Measures <r@somis.org>; Date: Thu, 31 Aug 2006 20:46:54 -0700; ¿You found the driving signal, but you applied no driving signal? Please describe the coupling method to the S.A. R L MEASURES, AG6K. 805-386-3734 r@somis.org _________________________________; /archives//html/Amps/2006-09/msg00000.html (8,806 bytes)
65. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 01 Sep 2006 11:25:52 +0100; I should have said 'ringing close to frequency the amp was tuned to'. I tried various couplings - a few inches of wire into a high impedance fet probe poked in lots of places. 1pF directly from the; /archives//html/Amps/2006-09/msg00006.html (8,856 bytes)
66. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 1 Sep 2006 12:36:56 +0200 (CEST); Re these ringing transients - is it possible to simulate (shudder!) the effect to determine its theoretical magnitude? 73 Peter G3RZP _______________________________________________ Amps mailing list; /archives//html/Amps/2006-09/msg00007.html (7,401 bytes)
67. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 01 Sep 2006 12:36:44 +0100; I hope not, I looked from 1MHz up to around 300MHz, in both full and part band sweeps. Around the tuned frequency was the only place I found repeatable signals. It's a laborious process as a spectrum; /archives//html/Amps/2006-09/msg00010.html (9,856 bytes)
68. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 01 Sep 2006 12:38:23 +0100; Without question. All you need is time and inclination :-) Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp; /archives//html/Amps/2006-09/msg00011.html (7,193 bytes)
69. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 1 Sep 2006 04:13:29 -0700; You were looking in the wrong part of the spectrum. R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con; /archives//html/Amps/2006-09/msg00014.html (10,142 bytes)
70. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 1 Sep 2006 04:21:32 -0700; From the early history of radio, we know that there were transmitters that generated over 1kW of RF -- and that it came about by using interrupted DC to ring a tuned circuit. R L MEASURES, AG6K. 805-; /archives//html/Amps/2006-09/msg00015.html (8,524 bytes)
71. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 01 Sep 2006 15:06:10 +0100; If/when I ever look again, I'll try that. and disconnecting the I didn't have anything connected to the input for any of the tests. Steve _______________________________________________ Amps mailing; /archives//html/Amps/2006-09/msg00018.html (8,922 bytes)
72. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: R L Measures <r@somis.org>; Date: Fri, 1 Sep 2006 16:36:44 -0700; And you were able to see the HF fundamental signal at the anodes. R L MEASURES, AG6K. 805-386-3734 r@somis.org _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2006-09/msg00027.html (9,765 bytes)
73. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 02 Sep 2006 07:46:15 +0100; I saw brief glimpses of a signal somewhere close to the tuned frequency (7MHz), which I assume was ringing in the whole tank circuit. Steve _______________________________________________ Amps mailin; /archives//html/Amps/2006-09/msg00028.html (9,918 bytes)
74. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 02 Sep 2006 15:23:32 +0100; It does to me when I think about the time it takes to go from conduction to cutoff with the usual bias switching in a g-g amp. Steve _______________________________________________ Amps mailing list; /archives//html/Amps/2006-09/msg00034.html (11,500 bytes)
75. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: R L Measures <r@somis.org>; Date: Sat, 2 Sep 2006 04:57:58 -0700; Steve -- There are two resonant circuits in the output circuitry, one HF and one VHF. The HF (near)*-resonant part has a broad, shallow dip. The VHF part has a sharp, deep dip that can suck a dipmete; /archives//html/Amps/2006-09/msg00049.html (12,070 bytes)
76. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 3 Sep 2006 08:57:37 +0200 (CEST); Infinite Z-transformations, I refer to them as near-resonant or semiresonant circuits.< Only because of your definition of resonance. For other, more mathematically rigorous definitions, L networks a; /archives//html/Amps/2006-09/msg00051.html (8,735 bytes)
77. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Sun, 3 Sep 2006 08:38:50 +0100; Fortunately it doesn't matter, because "resonance" does not affect what L- or Pi-networks actually do. -- 73 from Ian GM3SEK _______________________________________________ Amps mailing list Amps@con; /archives//html/Amps/2006-09/msg00053.html (8,526 bytes)
78. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 03 Sep 2006 13:15:08 +0100; It's not. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-09/msg00054.html (10,764 bytes)
79. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 03 Sep 2006 13:48:53 +0100; I think Monsieur Fourier explains it better than I can. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-09/msg00055.html (11,427 bytes)
80. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 3 Sep 2006 15:39:02 +0200 (CEST); current would flow through it because the reactive components are equal, opposite, in series, and not in parallel.< Only because of your non-rigorous definition of resonance. AC theory tells us that; /archives//html/Amps/2006-09/msg00057.html (9,175 bytes)

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