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41. [AMPS] 4-1000A Amp getting closer! (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Mon, 11 May 98 23:36:25 -0500; Hey all, For those of you who have been following my progress on my 4-1000A amp, I have some good news (knock on wood)! After making some circuit modifications and improving some of the bias switchin; /archives//html/Amps/1998-05/msg00166.html (7,723 bytes)
42. [AMPS] suppressors (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 12 May 98 09:36:14 -0500; Correct. Just looked it up in "Solid State Radio Engineering" by Krause, Bostinian and Raab. For a series circuit: Q=X/R Q is defined as: (2*pi*maximum instantaneous energy stored in the circuit)/en; /archives//html/Amps/1998-05/msg00174.html (7,437 bytes)
43. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 12 May 98 10:07:39 -0500; Why is our concern what load impedance the anode sees? IMHO, that load wil vary quite a bit over frequency. IMHO the load impedance is important only in so far as resonances are concerned. I also do; /archives//html/Amps/1998-05/msg00176.html (12,322 bytes)
44. [AMPS] IMD and Harmonics. (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 12 May 98 10:20:30 -0500; I agree with Peter again! I will type in the math, but from all that I can remember in my RF classes, we never discussed the fact that 3rd order IM tones were related in any way to the harmonics an; /archives//html/Amps/1998-05/msg00177.html (7,658 bytes)
45. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 12 May 98 19:34:17 -0500; I agree, Carl. I would be very interested in this. It would put to rest all of the "religion" that all of us experience with regard to this topic. However, I agree as you do that it would be difficu; /archives//html/Amps/1998-05/msg00187.html (11,078 bytes)
46. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Tue, 12 May 98 21:43:21 -0500; Ok, yes, I was talking a theoretical example. The "filter" could have a flyback where at higher frequencies the attenuation will actually start to degrade. Also, since no filter provides INFINITE at; /archives//html/Amps/1998-05/msg00190.html (10,576 bytes)
47. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 13 May 98 21:08:41 -0500; This anode and tank voltage is obviously the voltage of the HF signal. And it is an AC signal, not the DC like the anode supply. If the HF tank voltage can vary wildly and do what you say, which I b; /archives//html/Amps/1998-05/msg00209.html (10,207 bytes)
48. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 13 May 98 22:04:52 -0500; I think we got back on this subject when discussing our DOE of the amplifiers and how the output Pi-network looks to a VHF signal. So if we are concerned about VHF signals, we are concerned with par; /archives//html/Amps/1998-05/msg00213.html (9,145 bytes)
49. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 13 May 98 22:08:24 -0500; Amen...We agree, Carl.. Now that Tom is back in the discussion, it seems that both Tom and Rich claim the same things. Both claim the other is wrong; both claim the other insults only and doesn't us; /archives//html/Amps/1998-05/msg00214.html (9,082 bytes)
50. [AMPS] Re: (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 13 May 98 22:16:58 -0500; Based on my knowledge of filter designs (I sell high power filters), the filter does not "abosrb" energy outside of it's passband. Rather it rejects it. If you do a network analyzer plot of a filter; /archives//html/Amps/1998-05/msg00215.html (10,513 bytes)
51. [AMPS] Tank circuit pi-network at VHF (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Wed, 13 May 98 23:21:17 -0500; Ok all, I've done some more thinking about a couple of my posts this evening. If the output pi-network of an amp operates like a filter and filters out or rejects VHF energy, then how possibly could; /archives//html/Amps/1998-05/msg00218.html (7,316 bytes)
52. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 14 May 98 09:13:27 -0500; Tom, How can a series resistance of 100 Ohms or so be greater than the K-Ohm impedance of the anode circuit? The conventional concept of a supressor is that the coil chokes the VHF signal and the re; /archives//html/Amps/1998-05/msg00228.html (9,321 bytes)
53. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 14 May 98 17:07:53 -0500; I well, so you say.... Transmission lines, etc can act as impedance transformers. This is the whole idea behind phasing harnesses on antennas, 1/4 wave transformers, etc. However, a supressor is typ; /archives//html/Amps/1998-05/msg00238.html (9,625 bytes)
54. [AMPS] My try at unravelling the knotty VHF-Rp Enigma (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 14 May 98 17:19:32 -0500; I think this has been what Rich has been trying to say all along. Lower Rp means lower VHF gain. Rich's supressor inductors are lossy and so as you say: losses in the L tend to make Rp lower. Works; /archives//html/Amps/1998-05/msg00239.html (7,993 bytes)
55. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 14 May 98 22:11:27 -0500; I'll try... Is it perhaps that the Q of the tank circuit is very large? Larger Q will cause the voltages to be higher. And perhaps at the same time the switch that is used is really under-rated? It'; /archives//html/Amps/1998-05/msg00246.html (9,290 bytes)
56. [AMPS] Re: PA Measurments (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 14 May 98 22:19:49 -0500; I've never seen that either. Most of the network analyzers I have used do have APC-7's on them. However, generally these have either APC-7 to N adapters on them or cables attached. The other end of; /archives//html/Amps/1998-05/msg00247.html (7,917 bytes)
57. [AMPS] Re: PA Measurments (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 14 May 98 22:25:30 -0500; Larry, While I don't agree with Tom on a lot, I do agree with him here. Clip leads COULD very easily be used on 160 meters. Certainly not at VHF though. Tom is not saying that. The size of the conne; /archives//html/Amps/1998-05/msg00248.html (8,928 bytes)
58. [AMPS] filament decoupling for RF (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Thu, 14 May 98 22:29:17 -0500; I will certainly second that! 73, Jon KE9NA -- Jon Ogden KE9NA http://www.qsl.net/ke9na "A life lived in fear is a life half lived." -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions:; /archives//html/Amps/1998-05/msg00249.html (7,613 bytes)
59. [AMPS] Re: PA Measurments (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Fri, 15 May 98 08:57:36 -0500; Touche! Ya got me! :-) I'll agree. There are times whent he absolute precision is necessary. And actually, I have not yet read your original post. I haven't had the time lately to read ones labled *; /archives//html/Amps/1998-05/msg00260.html (8,435 bytes)
60. [AMPS] Re: Parasitics (score: 1): Author: jono@webspun.com (Jon Ogden); Date: Fri, 15 May 98 09:39:29 -0500; OK....I think the original question Carl posted though was not about the AL-80 but about another Ameritron amp. Is it possible that Ameritron uses a different, bandswitch.. So I still have my questi; /archives//html/Amps/1998-05/msg00262.html (10,733 bytes)

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