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21. [Amps] Nonsense (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Thu, 16 May 2002 20:02:03 +0200; Hi steve, there is no doubt that spurs or products of various type may be generated along a wide spectrum in the most strange or unpredictable ways, but no sub harmonic is existing in the strict sens; /archives//html/Amps/2002-05/msg00246.html (7,337 bytes)
22. [Amps] Re: [Amps] switch wafer (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 17 May 2002 16:11:27 +0200; I did help many times friends with failures in ceramic wafer switch contacts, typically Heath SB220. That kind of switch is not so common, at least here, but contacts of that kind are instead similar; /archives//html/Amps/2002-05/msg00270.html (8,107 bytes)
23. [Amps] Non-linear subharmonics was: Nonsense, AL-1500 parasitic (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sat, 18 May 2002 19:30:25 +0200; Hi Jeff, I've seen parametric as amplifiers in giant parabola dish at space ground stations already in the seventies, so not really new for me although I didn't really deal with any, my job was with; /archives//html/Amps/2002-05/msg00295.html (10,446 bytes)
24. [Amps] Non-linear subharmonics was: Nonsense, AL-1500 parasitic (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Mon, 20 May 2002 20:57:46 +0200; applied to Hi Peter, although a fraction of a fundamentel carrier can be somehow produced, this wasn't the original topic, a sub harmonic is something that doesn't exist. By nature, phisically and e; /archives//html/Amps/2002-05/msg00315.html (8,219 bytes)
25. [Amps] Re: [Amps] Non-linear subharmonics was: Nonsense, AL-1500 parasitic (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Tue, 21 May 2002 15:38:52 +0200; -- Initial Header -- To : amps@contesting.com Cc : Date : Tue, 21 May 2002 13:43:47 +0000 Subject : Re: [Amps] Non-linear subharmonics was: Nonsense, AL- 1500 parasitic e reads rries alified Sirs, no; /archives//html/Amps/2002-05/msg00330.html (7,744 bytes)
26. [Amps] RE: [Amps] Subharmonic (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 23 May 2002 12:03:30 +0200; It works but you need to download an image that's quite big and it takes time. To me, anyway, it doesn't say anything else than what already discussed. I see two generators, one feed and kicked by t; /archives//html/Amps/2002-05/msg00368.html (7,266 bytes)
27. [Amps] Re: [Amps] 12V 120A Switcihng Power supply? (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Tue, 2 Apr 2002 12:50:25 +0200; I'd be quite afraid by RF noise with a large current switching PS. Generally, in large PAs with a dedicated switching PS, the PS is in a sort of ST-BY during reception. This is not possible if the PS; /archives//html/Amps/2002-04/msg00062.html (6,533 bytes)
28. Re: [AMPS] a question for the EXPERT (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Tue, 4 Dec 2001 11:23:18 +0100; n The most common output configuration for tube amplifiers, at least in the FM broadcast applications, is a tuned cavity with a shunt variable line (tune) and a series capacitor (load). This is quit; /archives//html/Amps/2001-12/msg00070.html (7,478 bytes)
29. [AMPS] For who well know 8877 (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sun, 30 Dec 2001 21:00:31 +0100; 3500V is not enough (proper) for 2KW. With 4KV and an optimized output circuit the IP should be around 0.8 A or even less. Impossible! Only with 2 tubes or using a wrong wattmeter and a wrong ammeter; /archives//html/Amps/2001-12/msg00513.html (10,147 bytes)
30. [AMPS] Recognized Amplifier Experts (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sat, 3 Nov 2001 23:48:53 +0100; Careing to set the filament voltage to obtain the proper emission, rather than only keeping a fixed voltage, should extend the tube life noticeably without affecting gain and output power. 73, Mauri; /archives//html/Amps/2001-11/msg00025.html (7,124 bytes)
31. [AMPS] Finding the Q of a Coil (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sun, 7 Oct 2001 19:45:08 +0200; You are nearly right, Q is the reactance divided by the equivalent resistance, that's the sum of ohmic losses plus the RF losses. Generally speaking anyway, what counts is often the circuit Q rather; /archives//html/Amps/2001-10/msg00143.html (9,610 bytes)
32. [AMPS] Re: [TowerTalk] True Or Not True #2 (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Thu, 6 Sep 2001 23:50:43 +0200; Is there a chance to read a signal that produces 0 (zero) dB S/N ? What does it happen increasing that signal by 2 dB ? Is it detectable a 2 dB S/N ? Two divided by zero is equal to ? ....sleep well.; /archives//html/Amps/2001-09/msg00084.html (8,198 bytes)
33. [AMPS] Re: [TowerTalk] True Or Not True #2 (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 7 Sep 2001 10:27:39 +0200; OK. Since we are on the way to be correct and precise: 1) A decibel is not logarithm OF ratios of power. 2) A decibel is a decibel, in other words a number, independently if ratio of power, or voltag; /archives//html/Amps/2001-09/msg00095.html (8,269 bytes)
34. [AMPS] True Or Not True #2 (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 7 Sep 2001 11:00:16 +0200; Hi Firson, it depends by each factory.... Following conventions (traditions) it should be 6 db per S unit and 50 uV for S-9 in HF. Someone had 5 db per division (Drake, for example, if I remember co; /archives//html/Amps/2001-09/msg00096.html (9,473 bytes)
35. [AMPS] Re: [TowerTalk] True Or Not True #2 (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 7 Sep 2001 13:59:40 +0200; With a coherent method and slow F1 you can go much downer than noise floor (method used @ 137 KHz). The RX sensitivity, anyway, is given for a stated S/N ratio. 73, Mauri I4JMY -- FAQ on WWW: http://; /archives//html/Amps/2001-09/msg00102.html (7,887 bytes)
36. [AMPS] Re: [TowerTalk] True Or Not True #2 (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 7 Sep 2001 17:50:22 +0200; I meant not F1 but the detection of an unmodulated carrier. Sorry, 73, Mauri I4JMY -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQ; /archives//html/Amps/2001-09/msg00105.html (7,804 bytes)
37. [AMPS] Question (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sat, 8 Sep 2001 20:28:54 +0200; Somehow a CW signal can be detected by the brain (and other methods) as the presence of added noise to noise and following such extra noise dits and dots. Now, what's the minimal required S/N to dete; /archives//html/Amps/2001-09/msg00136.html (6,523 bytes)
38. [AMPS] IMD (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Tue, 18 Sep 2001 12:35:06 +0200; hear so much but a possibly too see if Nowadays, RF devices and apparatuses are mostly considered a carrier of digital informations like if they were a sort of virtual wide band cable. No wonder if; /archives//html/Amps/2001-09/msg00298.html (9,635 bytes)
39. [AMPS] Series C at tube, Sorry, for C read L (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 20 Sep 2001 16:42:09 +0200; Not necessarily it lowers because RL isn't inherently changed by tubes in parallel. To the limit, overall RL can increase if supply voltage is increased and current stay the same or even decreases.; /archives//html/Amps/2001-09/msg00370.html (9,553 bytes)
40. [AMPS] Plate Choke test with MFJ-259B (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 28 Sep 2001 10:22:51 +0200; The plate choke resonances depends by its inductance and windings capacitance, but stray capacitance also play a significant role. In other words the same plate choke inside different amplifier can r; /archives//html/Amps/2001-09/msg00453.html (10,332 bytes)

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