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Total 55 documents matching your query.

1. [AMPS] Network analysis of suppressors (score: 1): Author: siezzi@aeronix.com (Steve Iezzi); Date: Wed, 1 Mar 2000 16:04:44 -0500; It just so happens that I was building new suppressors for a Clipperton that I am returning to service and the parasitic topic comes up again. Since I have access to some very nice equipment, I can b; /archives//html/Amps/2000-03/msg00014.html (10,679 bytes)
2. [AMPS] Network analysis of suppressors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Wed, 1 Mar 2000 18:57:33 -0500; Hi Steve, Can you measure S21, and have you measured it? What is a "nice characteristic"? What was the goal? What frequency did you determine was involved in the problem you saw? How did you determin; /archives//html/Amps/2000-03/msg00018.html (12,059 bytes)
3. [AMPS] Network analysis of suppressors (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Wed, 01 Mar 2000 22:25:55 -0600; I think we can all agree that nichrome will lower the Q of the resonant circuit. It is a resistance. Adding a resistance in the inductive branch of an LR circuit will change the Q. No one is doubting; /archives//html/Amps/2000-03/msg00020.html (9,562 bytes)
4. [AMPS] Network analysis of suppressors (score: 1): Author: 2@vc.net (measures); Date: Wed, 1 Mar 2000 21:03:41 -0700; The important measurement is Q at c. 100MHz. I doubt that a harmonic of the exciter could be a factor. IMO, intermittent VHF parasitic oscillations principally take place in the VHF resonant circuit; /archives//html/Amps/2000-03/msg00023.html (12,721 bytes)
5. [AMPS] Network analysis of suppressors (score: 1): Author: 2@vc.net (measures); Date: Wed, 1 Mar 2000 21:12:27 -0700; At 100MHz? -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: htt; /archives//html/Amps/2000-03/msg00025.html (9,611 bytes)
6. [AMPS] Network analysis of suppressors (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Wed, 01 Mar 2000 23:55:23 -0600; No Rich. At 28 MHz. Oh that's, right. You've never built a 28 MHz amplifier. I forgot. You have no real world idea of how they got hot and glow like toaster coils! I got probably another 200 watts ou; /archives//html/Amps/2000-03/msg00027.html (9,576 bytes)
7. [AMPS] Network analysis of suppressors (score: 1): Author: itr@nanoteq.co.za (Ian Roberts); Date: Thu, 02 Mar 2000 11:01:44 +0200; Tom, please explain in your view, why tube type amplifiers are fitted with suppressors. And when amps with 3-500z's (for example) go band, why do they go bang? Ian, ZS6BTE -- FAQ on WWW: http://www.c; /archives//html/Amps/2000-03/msg00030.html (8,940 bytes)
8. [AMPS] Network analysis of suppressors (score: 1): Author: i4jmy@iol.it (i4jmy@iol.it); Date: Thu, 2 Mar 2000 13:15:12 +0100; My point in an amplifier is to preserve stability and maximize the gain (and efficiency) were I need, minimizing instead the amplification were it's not needed to amplify. 73, Mauri I4JMY -- FAQ on W; /archives//html/Amps/2000-03/msg00031.html (9,742 bytes)
9. [AMPS] Network analysis of suppressors (score: 1): Author: jono@enteract.com (Jon Ogden); Date: Thu, 02 Mar 2000 07:01:31 -0600; What Tom is saying is suppressors aren't magic cure-alls. If there is something else amiss with the amplifier that causes improper gain and phase margins, it will oscillate. Suppressors help alleviat; /archives//html/Amps/2000-03/msg00034.html (9,074 bytes)
10. [AMPS] Network analysis of suppressors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 2 Mar 2000 08:04:52 -0500; Hi Ian, Tubes flash over because something either exceeds the normal breakdown voltage, or because something inside the tube lowers the breakdown voltage. It's pretty common for 3-500Z's to gas up a; /archives//html/Amps/2000-03/msg00039.html (9,766 bytes)
11. [AMPS] Network analysis of suppressors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 2 Mar 2000 08:12:22 -0500; My point is exactly the same Mauri. I can stabilize any amplifier by loading it with losses at every frequency from DC to daylight. A good amplifier guru doesn't add unnecessary loss at the operatin; /archives//html/Amps/2000-03/msg00040.html (9,590 bytes)
12. [AMPS] Network analysis of suppressors (score: 1): Author: siezzi@aeronix.com (Steve Iezzi); Date: Thu, 2 Mar 2000 09:29:44 -0500; S21 for this network is 46 + j74 at 50 MHz. The goal was to dissipate about 1 to 2 watts per suppressor at 29 MHz. 572B tubes have significant feedback capacitance and this particular amp arced and; /archives//html/Amps/2000-03/msg00042.html (16,882 bytes)
13. [AMPS] Network analysis of suppressors (score: 1): Author: 2@vc.net (measures); Date: Thu, 2 Mar 2000 08:12:42 -0700; than You did not forget. The statement is not true. . -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Prob; /archives//html/Amps/2000-03/msg00045.html (9,577 bytes)
14. [AMPS] Network analysis of suppressors (score: 1): Author: 2@vc.net (measures); Date: Thu, 2 Mar 2000 08:12:40 -0700; Good point, Mauri. Low-VHF-Q parasitic suppressors are going to cost roughly 1% of an amplifier's max. output power at 28MHz. One intermittent parasitic-oscillation can cost 100% of the output power; /archives//html/Amps/2000-03/msg00047.html (10,825 bytes)
15. [AMPS] Network analysis of suppressors (score: 1): Author: 2@vc.net (measures); Date: Thu, 2 Mar 2000 08:12:50 -0700; Ian asked about a bang. External arcs can make a loud bang. In a vacuum, arcs do not bang. Heating a graphite-snode 3-500Z/8008 to a red color apparently increases the amount of leakage current in t; /archives//html/Amps/2000-03/msg00049.html (11,684 bytes)
16. [AMPS] Network analysis of suppressors (score: 1): Author: 2@vc.net (measures); Date: Thu, 2 Mar 2000 08:12:51 -0700; Adding roughly 1% loss at 28MHz appears to be the price of a VHF-suppression device.. There is no such thing as a free lunch -- even for amplifier gurus. cheers -- FAQ on WWW: http://www.contesting.; /archives//html/Amps/2000-03/msg00050.html (9,790 bytes)
17. SV: [AMPS] Network analysis of suppressors (score: 1): Author: sm5ki@algonet.se (sm5ki); Date: Thu, 02 Mar 2000 19:27:44 +0000; If you short-circuit the grid to the cathode with a number of low inductance caps ( chip caps? )in a super cathode tetrode amp - is this a good start to get a parasitic-free linear? Without any supre; /archives//html/Amps/2000-03/msg00054.html (12,060 bytes)
18. [AMPS] Network analysis of suppressors (score: 1): Author: W4EF@pacbell.net (Michael Tope); Date: Thu, 02 Mar 2000 08:09:56 -0800; Steve, I have seen this kind of behavior on marginally stable MMIC amplifiers. The harmonic goes thru the roof as it approaches the frequency range where the amp is very unstable, but the amp will no; /archives//html/Amps/2000-03/msg00060.html (9,786 bytes)
19. SV: [AMPS] Network analysis of suppressors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 2 Mar 2000 20:01:39 -0500; Hello Hans, Many amplifiers will be completely stable without suppressors if the grid connection can be made with a low impedance over a very wide frequency range. Such a connection is possible in tu; /archives//html/Amps/2000-03/msg00062.html (12,023 bytes)
20. [AMPS] Network analysis of suppressors (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Thu, 2 Mar 2000 20:01:39 -0500; Hi Steve, We must have attended different engineering schools Steve. I thought S21 was the reverse direction gain or loss. I'll dust off the books and look again, just to be sure. I can do that easil; /archives//html/Amps/2000-03/msg00063.html (18,584 bytes)

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