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161. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 6 Apr 1999 13:30:49 +0100; Peter, what have you done? You've awoken the undead! Prepare for at least six weeks of mayhem and misquotation... I used to think that the Q of a parasitic suppressor had some meaning. having looked; /archives//html/Amps/1999-04/msg00106.html (12,008 bytes)
162. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 7 Apr 1999 09:16:15 +0100; On the contrary... but it has been used on the whole circuit, not just stopping at the suppressor. The original was from me - Dick was the messenger. If that one parameter was truly was all that matt; /archives//html/Amps/1999-04/msg00131.html (12,247 bytes)
163. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 8 Apr 1999 13:17:49 +0100; I remember thrashing through all this with Rich, the last time this topic came around. With the typical 100nH/100ohm values we're talking about, the *measured* value of equivalent parallel resistance; /archives//html/Amps/1999-04/msg00155.html (10,494 bytes)
164. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 9 Apr 1999 08:48:34 +0100; The ultimate test is to increase the HV significantly above the normal voltage (which increases the gain) and look for oscillation with no load on either input or output. If the amp survives that tes; /archives//html/Amps/1999-04/msg00206.html (9,493 bytes)
165. [AMPS] Coax relay (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 23 Apr 1999 18:39:38 +0100; Well over a kW - I've used one at that power on 432MHz for several years. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.demon.co.uk/g3se; /archives//html/Amps/1999-04/msg00382.html (7,581 bytes)
166. [AMPS] Band Pass Filtering (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 29 Apr 1999 13:16:32 +0100; As Jon pointed out, his brick contains a preamp, so he wants to protect that too. However, that STILL doesn't require the filter to be capable of handling full TX power. Most commonly, when people ad; /archives//html/Amps/1999-04/msg00442.html (10,347 bytes)
167. [AMPS] Band Pass Filtering (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 29 Apr 1999 13:23:06 +0100; Aaaargh - those ultra-sharp single-cavity bandpass filters are a disaster! They combine all the worst features that a bandpass filter could have: touchy tuning, poor stopband rejection, hit-and-miss; /archives//html/Amps/1999-04/msg00443.html (8,966 bytes)
168. [AMPS] Screen stabilization in 30S-1? (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 3 Mar 1999 07:26:38 +0000; Given the difficulties of changing any one thing without having to change everything else (and also the attitude of Collins collectors to modified rigs) I'm inclined to agree. Thanks to everybody for; /archives//html/Amps/1999-03/msg00062.html (7,763 bytes)
169. [AMPS] Care and feeding of your Eimac 3-500 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 3 Mar 1999 14:29:36 +0000; That's true - it was written in the class C age and doesn't really get to grips with linear amplifiers. Well, even Eimac realise that, and their web site has had a "cooperative writing project" under; /archives//html/Amps/1999-03/msg00063.html (9,795 bytes)
170. [AMPS] Care and feeding of your Eimac 3-500 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 3 Mar 1999 19:39:46 +0000; Sorry, Rich, I'm absolutely not prepared to get involved in your personal disputes with Eimac. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifw; /archives//html/Amps/1999-03/msg00081.html (9,080 bytes)
171. [AMPS] Nichicon Caps (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 4 Mar 1999 08:47:59 +0000; They would have to be tested at full DC load current, in order to generate the ripple current through the capacitors - that's what could do the damage. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'; /archives//html/Amps/1999-03/msg00087.html (7,751 bytes)
172. [AMPS] more poor mans chimneys and glassware (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 4 Mar 1999 08:44:12 +0000; FWIW, I've been using Pyrex glass chimneys with 4CX250Bs for well over 20 years. They were cut from stock tubing that was a close slip fit over the anodes, the ends ground square, and simply glued on; /archives//html/Amps/1999-03/msg00088.html (10,535 bytes)
173. [AMPS] Ripple current ratings of high voltage caps. (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 6 Mar 1999 08:27:35 +0000; It's a bit like the old automobile industry saying: "Cheaper, faster, safer - pick any TWO." Getting back to capacitors, remember that the 85C or 105C ratings are external temperature, but what deter; /archives//html/Amps/1999-03/msg00123.html (10,696 bytes)
174. [AMPS] professional glass blowers (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 6 Mar 1999 16:54:34 +0000; That's what "FWIW" meant: "for what it's worth", i.e. whatever comes after may not apply in all cases. Slight change of subject here? So what material do/should they use for chimbleys for 4-1000As...; /archives//html/Amps/1999-03/msg00126.html (8,916 bytes)
175. [AMPS] Re: (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 9 Mar 1999 09:41:18 +0000; Yes-yes-yes PLEASE! In many countries outside of the USA, we have to pay by the second for e-mail downloads. The biggest single offender is actually the mailing list itself! Please can the listowners; /archives//html/Amps/1999-03/msg00183.html (7,374 bytes)
176. [AMPS] IT WORKS!!! (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 15 Mar 1999 07:21:04 +0000; Efficiency is very hard to measure accurately, and the potential errors mean that he might already have another 5-10% in fact... or it might be 5-10% worse. Typically Ep errors could be 2% full-scale; /archives//html/Amps/1999-03/msg00302.html (7,999 bytes)
177. [AMPS] IT WORKS!!! (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 15 Mar 1999 18:40:11 +0000; I agree. For most of us, efficiency is only a broad-brush indicator that everything else is working OK. Enjoy! 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB; /archives//html/Amps/1999-03/msg00321.html (8,103 bytes)
178. [AMPS] Corrected Amp Pics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 17 Mar 1999 07:44:08 +0000; There's a similar spreadsheet on my web site, that does pi and pi-L networks, and also includes strays and parasitic suppressors. Format is Excel 5 (or later). I'd be grateful for any comments. 73 fr; /archives//html/Amps/1999-03/msg00356.html (7,922 bytes)
179. [AMPS] Corrected Amp Pics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 17 Mar 1999 20:18:12 +0000; Excel 5 hasn't been the latest version for about 2 years... he's getting richer, even faster than you think. I'll send you an Excel 4 (probably BLS version) and can also do other formats on individua; /archives//html/Amps/1999-03/msg00386.html (8,227 bytes)
180. [AMPS] More on the SB220 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 19 Mar 1999 00:35:31 +0000; There could have been a silent arc inside the tube, with the bang coming from the resistor. IMO a 2W resistor standing in the way of a near-short across the HV supply is very likely to exit with a ba; /archives//html/Amps/1999-03/msg00462.html (11,260 bytes)

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