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References: [ +from:Peter_Chadwick@mitel.com: 967 ]

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141. No subject (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 15 Dec 2000 13:30:17 -0000; I've just been told that I have to go to Stockholm on Sunday on business. If I don't get back in to work before Christmas, A happy Christmas and a prosperous new year to all. 73 Peter G3RZP -- FAQ on; /archives//html/Amps/2000-12/msg00235.html (6,490 bytes)
142. [AMPS] DC Filaments??? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 3 Nov 2000 11:30:42 -0000; Hi all, Just got back from holiday, which is why I haven't commented before. One problem you can get with DC on filaments is metal migration. The filaments used in battery tubes such as the 1L4, were; /archives//html/Amps/2000-11/msg00039.html (9,291 bytes)
143. [AMPS] Two Tone 2000 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 7 Nov 2000 09:17:22 -0000; It could be worthwhile having 3 tone testing available, with two of the tones 100Hz apart. Not as good as 25 or 30 Hz apart, but does exercise the power supply in terms of its output impedance at low; /archives//html/Amps/2000-11/msg00083.html (7,525 bytes)
144. [AMPS] Grid bias supply? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 13 Nov 2000 10:19:09 -0000; For Class C, it doesn't matter. Run enough bias to keep the tubes within dissipation (this helps minimise voltage excursions on the HV, which can give overshoot and key clicks) and use a series grid; /archives//html/Amps/2000-11/msg00117.html (7,309 bytes)
145. [AMPS] 240VAC Amplifier Wiring (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 15 Nov 2000 13:43:54 -0000; Do you really mean this, Rich? I would have thought it should read 'to the ground wire'. My preference is to run the neutral to the equipment if needed (i.e.for 120volt stuff) and the ground wire to; /archives//html/Amps/2000-11/msg00156.html (9,566 bytes)
146. [AMPS] 240VAC Amplifier Wiring (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 15 Nov 2000 14:04:15 -0000; Yes, indeed, very much so. Any bypass capacitors from line to neutral or ground, or from neutral to ground must be Class X or Class Y rated as appropriate, too. 73 Peter G3RZP -- FAQ on WWW: http://w; /archives//html/Amps/2000-11/msg00159.html (9,358 bytes)
147. [AMPS] Bringing old amps back on line (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 16 Nov 2000 15:33:37 -0000; First thing I'd do is open up and give it a visual inspection. Have a look for white gunge on the ends of electrolytics, cracked or even semi-distressed looking resistors (especially the parasitic su; /archives//html/Amps/2000-11/msg00179.html (8,465 bytes)
148. [AMPS] KWM-380 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 17 Nov 2000 08:53:14 -0000; if http://www.wa3key.com/kwm380.html 25dB below each tone. That's 31 down on PEP - which is considered acceptable for channelised professional applications at HF. 73 Peter G3RZP -- FAQ on WWW: http:/; /archives//html/Amps/2000-11/msg00187.html (7,143 bytes)
149. [AMPS] grounds (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 17 Nov 2000 16:48:24 -0000; In the US power distribution system, I understand that the neutral is connected to ground at the point of entry to the property's distribution board. Do the electricity company provide a ground wire; /archives//html/Amps/2000-11/msg00189.html (8,102 bytes)
150. [AMPS] KWM-380 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 20 Nov 2000 08:53:37 -0000; Could well be. The only time I ever tried to use one was at the Collins Radio Club in Cedar Rapids; that visit coincided with a major solar flare, and the bands were all dead! 73 Peter G3RZP -- FAQ o; /archives//html/Amps/2000-11/msg00232.html (7,033 bytes)
151. [AMPS] 572B Warm up time (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 20 Nov 2000 09:56:10 -0000; Yes. A couple of seconds should be enough. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Probl; /archives//html/Amps/2000-11/msg00233.html (6,835 bytes)
152. [AMPS] Jennings variable Vacuum Caps specs (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 20 Nov 2000 10:13:34 -0000; They should perform like 4-400's in GG, except the plate dissipation is less. Although figures have been published in the older ARRL Handbooks for 4-125 and 4-400 in GG, they didn't publish for 4-250; /archives//html/Amps/2000-11/msg00234.html (8,764 bytes)
153. [AMPS] Grounds (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 20 Nov 2000 10:22:04 -0000; Thanks for all the comments. Here we have a totally different system The power line down the street is usually buried, and has 3 phases and a neutral. The neutral is grounded in various places, but n; /archives//html/Amps/2000-11/msg00235.html (8,631 bytes)
154. [AMPS] Grounds (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 22 Nov 2000 09:53:09 -0000; Interesting. We use to have that system in the UK, but it is no longer allowed. These were called ELCB - Earth Leakage Circuit Breaker - popularly called 'voltage trips'. These days, we have 'current; /archives//html/Amps/2000-11/msg00282.html (8,393 bytes)
155. [AMPS] Hi Power Connectors (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 22 Nov 2000 10:28:23 -0000; Nobody has mentioned HN connectors. Is this because they're not very common, or what? I've never seen an N type used at 1kW professionally; most of the equipment I've seen used either C type or HN or; /archives//html/Amps/2000-11/msg00284.html (9,039 bytes)
156. [AMPS] Re: Hi Power Connectors (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 22 Nov 2000 13:55:16 -0000; I believe that there have been some claims that type C can wear, and then don't lock adequately for carrying lots of power - it's said that some arcing can occur on the outer. The advantage of the sc; /archives//html/Amps/2000-11/msg00298.html (8,332 bytes)
157. [AMPS] Re: Hi Power Connectors (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 22 Nov 2000 16:57:33 -0000; Now if only I could remember where I saw that! It could have been in one of the professional RF publications - I know it was some time ago. Anyone else seen that? 73 Peter G3RZP -- FAQ on WWW: http:/; /archives//html/Amps/2000-11/msg00307.html (8,416 bytes)
158. [AMPS] Grounds (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 22 Nov 2000 17:22:51 -0000; I was very surprised to find how susceptible cows are to electrocution. Apparently, they can get killed in thunderstorms with a near strike because you get a potential difference along the ground sur; /archives//html/Amps/2000-11/msg00310.html (8,142 bytes)
159. [AMPS] Hi Power Connectors (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 22 Nov 2000 17:25:14 -0000; Are they OK on RTTY continuous duty at 1kW? Do they get warm at all under those conditions? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administr; /archives//html/Amps/2000-11/msg00311.html (8,992 bytes)
160. [AMPS] Hi Power Connectors (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 23 Nov 2000 12:49:38 -0000; Suhner of Switzerland rate type N connectors at 5100 watts at 20MHz and below with 1.0 SWR, 4200 watts at 1.2 SWR. 1900 watts at 150Mhz with 1.0SWR, 1500 watts at 1.2SWR 1100watts at 450MHz with 1.0; /archives//html/Amps/2000-11/msg00330.html (9,421 bytes)

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