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21. Re: [Amps] a 'circuits' question (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Wed, 08 Sep 2004 19:21:14 -0700; Steve, Thank you. I was trying to drive the MOSFET in the linear region. I figured gm would be accurate for the linear region and that bias adjustment would be accurate for a particular initial condi; /archives//html/Amps/2004-09/msg00174.html (9,382 bytes)
22. Re: [Amps] a 'circuits' question (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Fri, 10 Sep 2004 20:59:20 -0700; Steve, thank you for your reply. I have 8 working parts. 3 are nearly identical in bias and measure a gain of 4.5 cm +or- .1 cm. A fourth part has an identical gain but a bias that is significantly d; /archives//html/Amps/2004-09/msg00187.html (8,832 bytes)
23. [Amps] tube glowed red when grid resister blew on sb-220 (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sun, 12 Sep 2004 19:44:46 -0700; All, Recently one of grid resisters blew on an SB-220. The result was the tube glowed deep red to purple. Is this a reasonable outcome for a blown grid resistor on an SB-220? If the incident was only; /archives//html/Amps/2004-09/msg00234.html (6,600 bytes)
24. [Amps] output low pass power filter design (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Wed, 01 Dec 2004 09:28:57 -0800; All, I am planning on building a Communications Concepts based solid state PA. Where can I get good infor on output filter design, parts, and construction? The power capacity should be 1500 watts. Th; /archives//html/Amps/2004-12/msg00006.html (7,048 bytes)
25. [Amps] the dumb question of the month? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Fri, 10 Dec 2004 19:05:05 -0800; All, I am trying to figure out ferrite output transformers. This question is: "What does the frequency response of a ferrite transformer look like?" The output power transistors have been removed fro; /archives//html/Amps/2004-12/msg00169.html (6,658 bytes)
26. Re: [Amps] MOSFET amp article (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Tue, 11 Jan 2005 16:28:20 -0800; All, I have a general question regarding the 'bias' connection on this amp. It is the same circuit a is used in the 4x MRF150 and the 2x MRF154 amp. One of those references a separate bias control ci; /archives//html/Amps/2005-01/msg00223.html (8,201 bytes)
27. [Amps] how to measure impedence ?? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 19 Feb 2005 08:09:02 -0800; All, I am struggling with sorting out how measure impedance. I am building a solid state amp and am trying to sort out how the input and output transformers work. How can I measure the impedance of t; /archives//html/Amps/2005-02/msg00592.html (7,271 bytes)
28. [Amps] close to off topic - how to read antenna R + jX ?? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 26 Feb 2005 13:16:59 -0800; All, I have become interested in leaning more about what is actually going on at the antenna. I have a vertical and would like to measure it. First I have an Autek RF-1. It measures swr, Z, L, and C; /archives//html/Amps/2005-02/msg00863.html (7,687 bytes)
29. Re: [Amps] close to off topic - how to read antenna R + jX ?? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 26 Feb 2005 17:01:27 -0800; Thanks Alek, I will do the math tonight and see if the LC are resonant for the frequency. The LC readings are very close for 2 different 50 ohm terminators and an antenna that is close to resonant. T; /archives//html/Amps/2005-02/msg00874.html (9,878 bytes)
30. Re: [Amps] close to off topic - how to read antenna R + jX ?? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Thu, 03 Mar 2005 09:05:31 -0800; Well, Based on the replys I purchased an HP vector volt meter to measure antenna impedance. So far so good. Also based on the replys here I rigged up a simple circuit to 'look' at the antenna from th; /archives//html/Amps/2005-03/msg00028.html (9,546 bytes)
31. [Amps] how to make an HF dual directional coupler? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Thu, 03 Mar 2005 18:05:34 -0800; All, I have purchased a vector volt meter and apparently need a "dual directional coupler" to use the instrument. Where is there a good write up on these? I would like one to use on an HF antenna. To; /archives//html/Amps/2005-03/msg00037.html (6,878 bytes)
32. [Amps] help sorting out ETO (ETD??) amplifiers ?? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Fri, 04 Mar 2005 16:29:09 -0800; All, I recently purchased an older ETO (ETD?) amp with 2 MRF 136 transistors. The part descriptor is an AB-041. Does anyone know anything about this amp? There are 5 transistors on the board. Two are; /archives//html/Amps/2005-03/msg00071.html (7,194 bytes)
33. Re: [Amps] E-Book (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 05 Mar 2005 11:00:50 -0800; Will, That would be a great idea. I will volunteer to be your test audience. I would like to see a range of topics covered including how to measure and common designs. Yes, pdf is the way to go. It i; /archives//html/Amps/2005-03/msg00115.html (7,610 bytes)
34. Re: [Amps] E-Book (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sun, 06 Mar 2005 11:24:18 -0800; All, pdf is a common, cross platform, straightforward, compatible, widely available, commonly supported, easy to use, non obselesant, fully featured, secured, da da da standard. It is the best way to; /archives//html/Amps/2005-03/msg00176.html (13,814 bytes)
35. [Amps] hp 8405a operations ?? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Thu, 10 Mar 2005 06:43:16 -0800; All, Based on input here and other places I purchased an 8405A. I have also found a pdf for the service manual on line so have some idea about how to use it. That said I have a very low level questio; /archives//html/Amps/2005-03/msg00261.html (7,182 bytes)
36. Re: [Amps] FS: Solid State HF Amp (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 14 May 2005 21:18:05 -0700; Doc, I am interested in the filter circuits. What bands will your amp support? Where are you getting your filter circuits? Thanks, Dan _______________________________________________ Amps mailing lis; /archives//html/Amps/2005-05/msg00181.html (8,046 bytes)
37. [Amps] how to figure out solid state rf bias (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 14 May 2005 21:36:34 -0700; All, I have a couple of RF amps pulled from medical equipment. The power circuit is straight forward. However I am looking for advice on how to figure out the bias circuit. The power transistors are; /archives//html/Amps/2005-05/msg00182.html (6,762 bytes)
38. [Amps] how to measure impedance - 8405a vs 8415 (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sun, 12 Jun 2005 07:51:24 -0700; All, I would like to measure impedance. Does anyone have direct experience with using either an 8405a or an 8415 to do this? If so what are the relative merits of each? A second question: I have an 8; /archives//html/Amps/2005-06/msg00070.html (7,573 bytes)
39. [Amps] calibrating an 8405a ?? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Fri, 15 Jul 2005 21:27:56 -0700; All, I have an 8405a that in nearly working however it needs a calibration. The extender card is in place. My question is: To use the extender card do I move it to the test card location or use it in; /archives//html/Amps/2005-07/msg00178.html (6,356 bytes)
40. [Amps] 8450a card layout? (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sun, 17 Jul 2005 21:26:33 -0700; All, I cannot read the card layout from the pdf copy of the 8405a manual I have. Does anyone have a link to a good pdf copy of the 8405a manual? In particular I need the card layout. The second quest; /archives//html/Amps/2005-07/msg00197.html (6,400 bytes)

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