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101. Re: [Amps] 813's (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 27 May 2006 22:12:33 +0100; It came with a half built 2 x 813 amp I bought. I was going from memory, but it's only a week or so since I dug it out to check something, and I recall lookin at the mounting info. while thinking abo; /archives//html/Amps/2006-05/msg00433.html (8,466 bytes)
102. Re: [Amps] 813's (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 29 May 2006 07:21:09 +0100; If there's no grid current flowing, doesn't it just look like a capacitor for all normal purposes? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://l; /archives//html/Amps/2006-05/msg00469.html (7,688 bytes)
103. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 31 May 2006 07:07:20 +0100; Maybe he didn't. Feedback C is but one of many factors contributing to oscillation, and one over which the designer has no influence. Perhaps he believed/designed/intended that other elements of the; /archives//html/Amps/2006-05/msg00537.html (7,226 bytes)
104. Re: [Amps] Looking for shematic to set MRF448 into Class AB (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 31 May 2006 09:30:49 +0100; Acrian also supplied a lot of transistors to ENI. The devices might be S200-50 or S250-50. In practice, the difference will not matter to you. Steve _______________________________________________ Am; /archives//html/Amps/2006-05/msg00539.html (7,746 bytes)
105. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 31 May 2006 15:10:05 +0100; Indeed - but anode suppressors are not the only way to prevent oscillation. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai; /archives//html/Amps/2006-05/msg00551.html (8,291 bytes)
106. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 01 Jun 2006 11:52:57 +0100; Another thing in common is that they are sometimes used without understanding of what they do; without knowing if they do anything useful; and without consideration of whether alternatives can offer; /archives//html/Amps/2006-06/msg00002.html (9,353 bytes)
107. [Amps] Moderation (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 04 Jun 2006 07:55:57 +0100; Someone provides the facility of this list to us free of charge. In my view, that gives them the right to control it in any way they see fit. If I, or any of you, disapprove we're free to unsubscribe; /archives//html/Amps/2006-06/msg00082.html (6,387 bytes)
108. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 04 Jun 2006 15:16:45 +0100; Being pedantic, any definition of resonance has to apply to any and all systems, not just a tuned circuit. Whatever applies to a spring, or air column etc., has to be translated into appropriate elec; /archives//html/Amps/2006-06/msg00101.html (9,633 bytes)
109. Re: [Amps] need to buy MRF150 transistors (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 06 Jun 2006 22:26:15 +0100; www.rfparts.com is probably as good as anywhere. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-06/msg00182.html (6,804 bytes)
110. Re: [Amps] buying MRF-150's (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 07 Jun 2006 07:23:43 +0100; I don't know about the matching method, but rfparts list price is $50 vs $54 for Richardson for single devices. I have a Richardson trade account, but I'm told they do not encourage personal buyers.; /archives//html/Amps/2006-06/msg00189.html (7,143 bytes)
111. Re: [Amps] exciter overshoot (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 09 Jun 2006 16:05:17 +0100; And the effects are more dramatic if the amplifier has a slow aerial c/o relay. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2006-06/msg00238.html (6,910 bytes)
112. Re: [Amps] W6PO 2m amplifier - input circuit adjustment (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 09 Jun 2006 20:52:45 +0100; Maybe, but make two coils like the airspaced one, spend just a few minutes getting them squashed/stretched right and you don't need to touch it again for 20 years. Beats drilling holes anytime :-) St; /archives//html/Amps/2006-06/msg00243.html (7,896 bytes)
113. Re: [Amps] VHF UHF Amp Book (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 19 Jun 2006 07:19:23 +0100; Make sure you pay the right price. It's over 20 years old, and much of the content was obsolete when it was printed. Regretably that didn't improve much in the subsequent version. Much of my contribu; /archives//html/Amps/2006-06/msg00322.html (7,632 bytes)
114. Re: [Amps] AL-80B questions (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 27 Jun 2006 07:40:53 +0100; That was my thought at first - harmonic load phase angles (or a load line if one exists) could have a big effect in a hard driven amplifier. Another thought (much easier in a picture). Plot a grph of; /archives//html/Amps/2006-06/msg00501.html (8,579 bytes)
115. Re: [Amps] HLA150 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 28 Jun 2006 16:00:19 +0100; Checking the limits of linear operation is an important test - likely to be lots less than the 'rated' output even with improved bias supplies. Steve _______________________________________________ A; /archives//html/Amps/2006-06/msg00565.html (7,006 bytes)
116. Re: [Amps] Parasitic Resistors (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 28 Jun 2006 16:01:50 +0100; Almost certainly not. I've just measured a 100R 3W metal film resistor with 6mm (.25") leads at each end (Corning FP series). It shows as having 4nH inductance in series with 102R resistive - that's; /archives//html/Amps/2006-06/msg00566.html (7,835 bytes)
117. [Amps] 8877 wanted (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 28 Jun 2006 22:28:15 +0100; I have a friend (in the UK) looking for a good 8877. If there's anything on offer I'll pass it on. Trans-Atlantic shipping needn't be a show stopper. Thanks, Steve ___________________________________; /archives//html/Amps/2006-06/msg00606.html (6,283 bytes)
118. Re: [Amps] HLA-150? Nevermind. (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 28 Jun 2006 22:37:13 +0100; The transistors used in these sorts of amps are usually designed for VHF mobile radio use - class C, heavily into saturation for high efficiency at the rated power, inherent current limiting for high; /archives//html/Amps/2006-06/msg00608.html (7,725 bytes)
119. Re: [Amps] IM distortion and such (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 29 Jun 2006 17:23:32 +0100; Is it worth mentioning that the 'tune then back off peak Ia' achieves the same (or very similar) end result as tuning for maximum Po, then increasing the loading a little bit which many folks practic; /archives//html/Amps/2006-06/msg00634.html (9,938 bytes)
120. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 03 Jul 2006 11:42:49 +0100; At VHF the ETSI specs. I've been working to lately have changed from the old MPT ones and there's an absolute -36dBm on harmonics and spurious up to 1GHz, regardless of tx power level. At 100W it's a; /archives//html/Amps/2006-07/msg00083.html (9,220 bytes)

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