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161. [AMPS] Re: Hi Power Connectors (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 23 Nov 2000 13:18:07 -0000; Aren't they worth more than that in scrap metal value? have a good Thanksgiving, everyone, don't eat too much turkey.... 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions:; /archives//html/Amps/2000-11/msg00334.html (7,931 bytes)
162. [AMPS] Re: Circuit for measuring RF voltage... (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 23 Nov 2000 16:06:42 -0000; I haven't seen an analogue 'scope guaranteed to an accuracy of better than +/-5% of full screen. That means a possible power error of around +/-10%, excluding probe errors. Digital ones can get to 1%; /archives//html/Amps/2000-11/msg00338.html (8,384 bytes)
163. [AMPS] Hi Power Connectors (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 23 Nov 2000 17:05:31 -0000; The maximum contact resistances quoted give 350mW dissipation in the connector at that, with a current density of 1940 amps/sq. inch. Which may seem a lot, but RG213 at that current density is only c; /archives//html/Amps/2000-11/msg00341.html (9,209 bytes)
164. [AMPS] Re: Circuit for measuring RF voltage... (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 24 Nov 2000 08:56:40 -0000; Very much so. One just needs to bear in mind that test gear does need re-calibrating, and as amateurs, we don't always do it as often as we should. Incidentally, approved European Test Houses should; /archives//html/Amps/2000-11/msg00354.html (8,881 bytes)
165. [AMPS] Re: Circuit for measuring RF voltage... (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 27 Nov 2000 09:24:24 -0000; Doesn't contact potential of the 6AL5 affect the accuracy? The problem with the voltage and current measurement schemes is that the error is squared, so a 3% error in measurement gives a 6% error in; /archives//html/Amps/2000-11/msg00384.html (8,633 bytes)
166. [AMPS] Hi Power Connectors (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 29 Nov 2000 10:33:39 -0000; Amp still do - see the tyco electronics web page http://catalog.tycoelectronics.com/ 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative r; /archives//html/Amps/2000-11/msg00421.html (8,325 bytes)
167. [AMPS] Tetrode PA (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 29 Nov 2000 13:35:24 -0000; Pappenfus suggests using the maximum screen volts and adjusting bias for rated zero signal plate current for the tube with lowest plate current. Then adjust screen volts on the other tube(s) for rate; /archives//html/Amps/2000-11/msg00427.html (6,817 bytes)
168. [AMPS] Low Pass Filter (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 29 Nov 2000 16:49:24 -0000; Tell it not in Garth, whisper it not in the streets of Absalom, but the MFJ 30MHz LPF that I got is well made, appears to do an adequate job if the network analyser at work can be believed, and uses; /archives//html/Amps/2000-11/msg00432.html (8,163 bytes)
169. [AMPS] Low Pass Filter (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 30 Nov 2000 08:46:14 -0000; Regrettably, not enough to meet the requirements of the ITU Radio Regulations or, for Europeans, the requirements of the CEPT Recommendation T/R 74-01 on Spurious emissions. 73 peter G3RZP -- FAQ on; /archives//html/Amps/2000-11/msg00443.html (7,936 bytes)
170. [AMPS] Low Pass Filter (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 30 Nov 2000 08:54:38 -0000; Misterminating a filter in its stop band has relatively little effect on its performance. This is because filters reflect the energy applied to them when that energy is on a frequency in the stop ban; /archives//html/Amps/2000-11/msg00444.html (8,411 bytes)
171. [AMPS] Low Pass Filter (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 30 Nov 2000 09:47:43 -0000; That is where hams in the UK have a big advantage - we have no broadcast TV below 470MHz. But as Mauri says, most domestic EMC problems are caused by overload, frequently from common mode currents in; /archives//html/Amps/2000-11/msg00447.html (8,047 bytes)
172. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 30 Nov 2000 09:53:18 -0000; If you happen to have bi-phase rectification or choke input with negative lead filtering, then the transformer and/or choke insulation need checking as well as the cap stack. Aren't there advantages; /archives//html/Amps/2000-11/msg00448.html (9,703 bytes)
173. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 30 Nov 2000 12:49:25 -0000; Tom, You're forgetting that the only HV faults that ever appear are because of parasitics! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administra; /archives//html/Amps/2000-11/msg00452.html (12,158 bytes)
174. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 07:14:18 +0100; Not everyone, Tom. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesti; /archives//html/Amps/2000-10/msg00013.html (7,632 bytes)
175. [AMPS] SB220 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 07:28:22 +0100; filament Is there a particular reason that this failure mode can exist E.g no fuse for (false) economic reasons, or did it just happen that way - as things sometimes do in designs? 73 Peter G3RZP --; /archives//html/Amps/2000-10/msg00014.html (6,839 bytes)
176. [AMPS] Bird meters (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 07:30:46 +0100; Does anyone know if Bird thruline meters are linear meters (i.e. deflection directly proportional to current) with a non-linear scale, or if they are non-linear meters (i.e. deflection proportional t; /archives//html/Amps/2000-10/msg00015.html (7,714 bytes)
177. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 07:35:18 +0100; How does one see that on a spectrum analyser? Because it's not a continuous signal in the time domain, it's not the thing to look for with a spectrum analyser. Remember too, that a spectrum analyser,; /archives//html/Amps/2000-10/msg00016.html (8,084 bytes)
178. [AMPS] Bird meters (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 07:47:43 +0100; Hi Jose, Thanks. Look forward to the results. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Pr; /archives//html/Amps/2000-10/msg00018.html (7,922 bytes)
179. [AMPS] collins 30L - 1 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 08:00:13 +0100; The (admittedly partial) circuits that I have for those two amplifiers do not show a phase comparator for tuning, but an amplitude comparator. When the loading is correct, there's a definite ratio of; /archives//html/Amps/2000-10/msg00019.html (7,661 bytes)
180. [AMPS] Bird meters (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 2 Oct 2000 08:39:14 +0100; No, Jim, you understand the question fine. I'm not too sure that's the answer I want though! With Bird replacement meters at $70a pop, I'm hoping that a rescaled conventional meter and an op amp to d; /archives//html/Amps/2000-10/msg00021.html (8,656 bytes)

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