Mail Archive Search: <+from:i4jmy@iol.it>

Results:

References: [ +from:i4jmy@iol.it: 231 ]

Total 231 documents matching your query.

61. [AMPS] 3phases & Alpha (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Wed, 3 Jan 2001 11:08:56 +0100; A transformer doesn't care if an AC current is obtained by one leg of a 380V 3phase to neutral or in another way because the primary and secondary windings are electrically isolated. When a conflict; /archives//html/Amps/2001-01/msg00090.html (7,569 bytes)
62. [AMPS] 3 phase HT power supplies. (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sun, 7 Jan 2001 22:50:03 +0100; A twelve-pulse transformer/rectifier series system offers the advantage of a DC output whose ripple is about 1% without any capacitive filtering but requires a very well designed 3phase transformer a; /archives//html/Amps/2001-01/msg00255.html (12,427 bytes)
63. [AMPS] Advice about what linear to buy (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Tue, 9 Jan 2001 10:26:01 +0100; Working in a linear region, two amplifiers using an identical configuration and similar devices, if properly biased and tuned for the wanted output level, doesn't necessarily produce an IMD advantag; /archives//html/Amps/2001-01/msg00309.html (9,352 bytes)
64. [AMPS] Fwd: [TowerTalk] W6SAI SK (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 26 Jan 2001 08:58:18 +0100; -- Initial message -- To : <towertalk@contesting.com> Cc : Date : Fri, 26 Jan 2001 00:50:01 -0500 Subject : [TowerTalk] W6SAI SK This e-mail was received today from W6FR... -- Gentlemen: It is with d; /archives//html/Amps/2001-01/msg00647.html (6,994 bytes)
65. [AMPS] neutralizing (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Tue, 30 Jan 2001 16:12:35 +0100; It's not a smart idea to neutralize a Gg amplifier because that configuration is inherently stable and doesn't require it. When a tube doesn't comply with the above statement and requires to be neutr; /archives//html/Amps/2001-01/msg00711.html (9,193 bytes)
66. [AMPS] neutralizing (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Tue, 30 Jan 2001 20:12:08 +0100; Hi Tom Using modern and good ceramic tubes, the neutralization in Gg applications is practically a complication and a waste of time. I never seen any neutralization in professional and broadcast Gg a; /archives//html/Amps/2001-01/msg00730.html (9,487 bytes)
67. [AMPS] linear amps (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Tue, 30 Jan 2001 20:36:18 +0100; Hi Tom, if I remember correctly, the inherent feedthrough capacitance for a 4cx1000 in a common grid configuration is less than 0.01 pF, formerly 0.00 pf. In my experience the 4cx1000 stability probl; /archives//html/Amps/2001-01/msg00732.html (10,755 bytes)
68. SV: [AMPS] SB-220 Glitch Resistor ??? (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 1 Dec 2000 10:20:18 +0100; Isolation problems may increase because of the transition between very different dielectric constants (i.e air and PTFE). 73, Mauri I4JMY -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submission; /archives//html/Amps/2000-12/msg00003.html (8,626 bytes)
69. [AMPS] Directional coupler design (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sun, 3 Dec 2000 23:58:17 +0100; It really works like that when the load impedance is enough close to the nominal impedance of the line used as the directional coupler. 73, Mauri I4JMY -- FAQ on WWW: http://www.contesting.com/FAQ/a; /archives//html/Amps/2000-12/msg00045.html (7,621 bytes)
70. [AMPS] SWR Protection (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Tue, 5 Dec 2000 17:25:46 +0100; collectors. If we are talking about the same thing, where the zeners are, the DC path to collector, actually there's no RF voltage. The purpose of those zeners is quite different than SWR protection; /archives//html/Amps/2000-12/msg00076.html (8,852 bytes)
71. [AMPS] SB220 output (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Fri, 8 Dec 2000 22:01:55 +0100; Original SB220 transformer is rather weak, also at 1000W DC, and cooling is also insufficient. I was asked friends to modifiy SB220 (5 units) in the early 80's with an external HV supply and a full; /archives//html/Amps/2000-12/msg00135.html (8,723 bytes)
72. [AMPS] Choke series resonance clarification (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sun, 10 Dec 2000 23:36:05 +0100; touches If the coil form dielectric constant is equal or larger than the air dielectric constant, and that material has no losses at frequency in use, I don't see how stray capacitance can increase.; /archives//html/Amps/2000-12/msg00185.html (9,725 bytes)
73. [AMPS] Choke series resonance clarification (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Mon, 11 Dec 2000 11:33:07 +0100; May be yes, when the bishop of Rome would pontificate about bridges. (hi) 73, Mauri I4JMY Main Entry: 2pon.tif.i.cate Pronunciation: pän-'ti-f&-"kAt Function: intransitive verb Etymology: Medie; /archives//html/Amps/2000-12/msg00191.html (9,343 bytes)
74. [AMPS] SB220 power output (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 14 Dec 2000 10:04:11 +0100; On some bands (i.e. 40m) in SSB position and with a good 230V AC supply, and with exciters able to deliver enough driving power, the SB220 output can easily exceed 1500W (a value that's already well; /archives//html/Amps/2000-12/msg00222.html (8,757 bytes)
75. [AMPS] On-off, or leave it on? (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Mon, 25 Dec 2000 13:03:03 +0100; Having seen what may happen to the geometry of a cold filament because of an inrush current, I wouldn't like to switch on an off many times my amplifier. On the other hand, even modern TV sets have a; /archives//html/Amps/2000-12/msg00303.html (9,377 bytes)
76. [AMPS] On-off, or leave it on? (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sun, 31 Dec 2000 12:46:23 +0100; Hi Pete, as I already tried to explain in a previous message, the biggest stress moment for the filament is when a cold one is powered and nothing exist to limit the inrush current. Filament size and; /archives//html/Amps/2000-12/msg00378.html (9,187 bytes)
77. [AMPS] RF Choke (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Fri, 3 Nov 2000 00:16:17 +0100; With no grid trip circuit like in SB220, a direct grounding strap is not raccomandable (and doesn't enhance anything in practice). 73, Mauri I4JMY -- FAQ on WWW: http://www.contesting.com/FAQ/amps Su; /archives//html/Amps/2000-11/msg00031.html (9,308 bytes)
78. [AMPS] RF Choke (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 3 Nov 2000 16:12:16 +0100; gain in Not only a 1mH choke is existing but also capacitors. If the choke is not open and capacitors not broken, the circuit reactance is neglegible and SB220 gain is totally unaffected. Some diffe; /archives//html/Amps/2000-11/msg00041.html (9,372 bytes)
79. [AMPS] RF Choke (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sat, 4 Nov 2000 19:34:02 +0100; My english is not enough good to perceive (for sure) if some sentence has a sarcastic vein or not, but I don't care. If grid-ground reactance is not low enough to be neglectable at frequency in use,; /archives//html/Amps/2000-11/msg00057.html (9,689 bytes)
80. [AMPS] RF Choke (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sun, 5 Nov 2000 12:30:25 +0100; About ten years ago, owning an ham shop with lab. repair, the most common problem in TL922 and SB220 was the bandswitches damage (contact fingers) but also the opened grid coil that acted like a fuse; /archives//html/Amps/2000-11/msg00061.html (9,039 bytes)

Current List: 61 - 80
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]