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

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121. [AMPS] Suppressors, measurements, and acrimonious blather (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 3 Aug 2000 11:37:06 +0200; Mostly correct as general statement but also some tubes mechanical construction (internal electrodes or wires, socket dimensions and shape) lead to inherent stability problems and the best RF designe; /archives//html/Amps/2000-08/msg00037.html (10,274 bytes)
122. [AMPS] Suppressors, measurements, and acrimonious blather (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 3 Aug 2000 11:37:30 +0200; Mostly correct as general statement but also some tubes mechanical construction (internal electrodes or wires, socket dimensions and shape) lead to inherent stability problems and the best RF designe; /archives//html/Amps/2000-08/msg00038.html (10,453 bytes)
123. [AMPS] Suppressors, measurements, and acrimonious blather (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 3 Aug 2000 15:34:33 +0200; In case the resistance become very high or infinite, not only the suppressor doesn't work but there's an increased risk to have parasitics than without the damaged suppressor. When amplifier power is; /archives//html/Amps/2000-08/msg00046.html (11,505 bytes)
124. [AMPS] Suppressors, measurements, and acrimonious blather (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 3 Aug 2000 15:33:26 +0200; In case the resistance become very high or infinite, not only the suppressor doesn't work but there's an increased risk to have parasitics than without the damaged suppressor. When amplifier power is; /archives//html/Amps/2000-08/msg00047.html (11,505 bytes)
125. [AMPS] SB1000 parasite question for Tom and Rich+ (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 4 Aug 2000 10:37:44 +0200; RF design is not such a complicate matter, in theory, what's difficult is to deal with and to realize objects that doesn't introduce too many unknown parasitic parameters so modifying, in practice, t; /archives//html/Amps/2000-08/msg00081.html (12,856 bytes)
126. R: [AMPS] Suppressors, measurements, and acrimonious blather+ (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Tue, 8 Aug 2000 23:16:04 +0200; In any case, old or brand new ones, an excessive current flow may break the suppresor resistor or lead to derate its OHmic value until the flowing current is decreased to an acceptable value for allo; /archives//html/Amps/2000-08/msg00172.html (8,912 bytes)
127. [AMPS] single tube vs. twins (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Fri, 11 Aug 2000 09:37:45 +0200; Generally speaking single or paired has small practical differences in performance of an HF amplifiaer but often, the price to buy two (real transmitting) tubes is higher than the price of a single a; /archives//html/Amps/2000-08/msg00199.html (8,489 bytes)
128. R: [AMPS] Relays hanging up (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sat, 12 Aug 2000 13:01:39 +0200; Actually, magnetical histeresis causes the core to temporary become a magnet. In good relays this time is generally a short one and a permanent retention is only a matter of mechanical problems or ar; /archives//html/Amps/2000-08/msg00223.html (9,844 bytes)
129. R: [AMPS] 3CX800A's (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sat, 12 Aug 2000 23:57:54 +0200; The 3CX800A7 has been discontinued, you (and everyone else) can only find 3CPX800A7. Unluckily 3CPX800a7 of recent production are reported to be nearly all defective (Hi grid, low out after few hours; /archives//html/Amps/2000-08/msg00253.html (9,759 bytes)
130. R: [AMPS] 3CX800A's (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Sun, 13 Aug 2000 18:09:33 +0200; This is a multi-part message in MIME format. --=_NextPart_000_001B_01C00551.A218D480 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Good news that Svetlana; /archives//html/Amps/2000-08/msg00269.html (14,848 bytes)
131. [AMPS] CBers (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Wed, 30 Aug 2000 17:15:04 +0200; Ok, everybody listen some CB on 28 Mhz, someone with antennas while others are supposed to do it with dummy loads. As easily confirmed by the last mails, the disturbs mainly appear because of out of; /archives//html/Amps/2000-08/msg00527.html (8,639 bytes)
132. [AMPS] Problem with SB-220 Bias Diodes (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 31 Aug 2000 10:19:24 +0200; The forward polarized diodes used are probably unsuited for this application or with some short term abnormal condition (i.e. lousy antenna connector, bad soldering somewere, parasitics, etc.) Change; /archives//html/Amps/2000-08/msg00566.html (8,582 bytes)
133. [AMPS] Problem with SB-220 Bias Diodes (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 31 Aug 2000 15:15:18 +0200; True as a general issue, but in practice all depends by which diodes and what's the peak duration/current involved. Evidently, 1N4005 are not enough compliant with the general assumption if compared; /archives//html/Amps/2000-08/msg00574.html (9,551 bytes)
134. [AMPS] Problem with SB-220 Bias Diodes (score: 1): Author: i4jmy@iol.it (Maurizio Panicara); Date: Thu, 31 Aug 2000 20:32:44 +0200; But someone told a number 30 wire 1/2 inch long fuse didn't blow up ...... Jokes apart, there's another issue often neglected that's what happens to a GG tube when HV disappear and drive power stay o; /archives//html/Amps/2000-08/msg00583.html (8,738 bytes)
135. [AMPS] PushPull (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Tue, 25 Jul 2000 17:08:29 +0200; Althougt uncommon on tubes because of the high impedances and the typical tuned outputs, a class B push pull broadband amplifier has advantages in a lower harmonic content and with the more simple an; /archives//html/Amps/2000-07/msg00154.html (8,281 bytes)
136. [AMPS] FCC certification - how do they do it? (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 27 Jul 2000 12:49:26 +0200; Not so easy, unfortunately. An European directive is not yet a law and that directive is a sort of headline, incomplete with specific electrical parameters (numbers). Until single governaments will n; /archives//html/Amps/2000-07/msg00175.html (9,861 bytes)
137. [AMPS] FCC certification - how do they do it? (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 27 Jul 2000 13:33:12 +0200; The EMC(LWD included) are tests for CE marking of electrical devices. Then, it has to be made a clear point if an object requires or not the omologation to be operated. If the omologation is required; /archives//html/Amps/2000-07/msg00177.html (10,782 bytes)
138. [AMPS] s meter calibration (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Tue, 13 Jun 2000 16:49:33 +0200; Stated first that we can survive without accurate S meter readings and better we use something else to measure strenghts than communications receivers, the point that's difficult to use the modern re; /archives//html/Amps/2000-06/msg00145.html (10,458 bytes)
139. [AMPS] s meter calibration (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Wed, 14 Jun 2000 12:20:44 +0200; The laboratory generator accuracy is expressed in dBm and is relative to its output power when closed on its nominal load. The receiver S- meter circuit is not a power meter but only a selective (rel; /archives//html/Amps/2000-06/msg00174.html (11,161 bytes)
140. Fw: [AMPS] 4CX-1000A or 4CX-1500A Amplifier Plans (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Tue, 20 Jun 2000 12:16:43 +0200; Years ago I built such an amplifier with a paired 4cx1000. As I can remember, didn't found any special problem connecting the screen to the chaissis while that was the only way to modify the socket i; /archives//html/Amps/2000-06/msg00269.html (8,698 bytes)

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