- 41. Re: [TenTec] Semi-conductor device (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 15 Sep 2003 12:00:37 -0400
- MTM1N45 is a to3 style case (large metal) 1 amp 450 volt N channel enhancement mode Power MOSFET. Made by Motorola. They are not available anymore in this package. Good for high voltage regulator as
- /archives//html/TenTec/2003-09/msg00240.html (8,517 bytes)
- 42. Re: [TenTec] Semi-conductor device (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 15 Sep 2003 12:05:46 -0400
- The 8713 is the date code 1987 13th week. Bill At 08:57 AM 9/15/2003 -0500, you wrote: I have in my possession several Motorola MTM15N45 which also has a number stamped on the case 8713 which I assum
- /archives//html/TenTec/2003-09/msg00241.html (8,532 bytes)
- 43. Re: [TenTec] Semi-conductor device (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 15 Sep 2003 12:04:07 -0400
- OOPS read it wrong. MTM15N45 which is a 15 amp 450 volt N channel enhancement mode power MOSFET made by Motorola. It is very difficult to find these in the TO3 style cases now. Mostly replaced by the
- /archives//html/TenTec/2003-09/msg00242.html (8,751 bytes)
- 44. Re: Re: [TenTec] Semi-conductor device (score: 1)
- Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
- Date: Mon, 15 Sep 2003 23:24:13 -0400
- The way the Motorola numbers work is that the third letter is M for metal case or P for plastic and the first number is current rateing the following letter is type of channel and the last number is
- /archives//html/TenTec/2003-09/msg00254.html (9,890 bytes)
- 45. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 20 Oct 2003 12:08:12 -0400
- The reason why half wave dipoles are half wave length is not for a specific impedance but that they are resonant. Small antennas like the half wave dipole are not effective radiators unless they are
- /archives//html/TenTec/2003-10/msg00612.html (12,283 bytes)
- 46. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 20 Oct 2003 14:15:02 -0400
- Oh yes if the directors or reflectors are too far off resonance they don't accomplish anything. Just like the elements on a multiband yagi. A 15 meter director can't act as a 10 meter reflector becau
- /archives//html/TenTec/2003-10/msg00617.html (16,438 bytes)
- 47. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 20 Oct 2003 14:11:35 -0400
- Not quite correct. The driven element is at resonance to maximize radiation but the others are slightly off to either side of resonance so that for phasing purposes. This is so that the induced curre
- /archives//html/TenTec/2003-10/msg00618.html (16,946 bytes)
- 48. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 20 Oct 2003 14:37:23 -0400
- An interesting point. Has anyone looked at the curriculum of the ARRL's Big Project. I did a word search thru the lab manuals and words such as resonance, resonate,etc are not existent. Resonance is
- /archives//html/TenTec/2003-10/msg00619.html (10,181 bytes)
- 49. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 20 Oct 2003 14:47:47 -0400
- By the way this is my 30 year as an electrical engineer. I got my ticket in 1961. The problem is many people have simply have stopped asking the questions of why and how things work. They have a grea
- /archives//html/TenTec/2003-10/msg00622.html (12,681 bytes)
- 50. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 20 Oct 2003 15:30:11 -0400
- I did not say the antenna had to be resonant but the antenna system must be resonant to be effective if the antenna is short. You can make the antenna nearly as small as you want but to match the imp
- /archives//html/TenTec/2003-10/msg00626.html (17,569 bytes)
- 51. Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Tue, 21 Oct 2003 11:05:49 -0400
- I see now that the problem is that some of you are caught in an old on going argument between non-resonant antennas and resonant antennas. By the way I have used "wires" and "AO" for years. But not r
- /archives//html/TenTec/2003-10/msg00654.html (11,979 bytes)
- 52. Re: Re: [TenTec] Re: Rudimentary SWR question... (score: 1)
- Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
- Date: Sun, 26 Oct 2003 22:18:39 -0500
- AH! This is not an opinion but a well I would like to point out that the reflector and directors in a yagi are resonant. They are slightly off resonance (not at the peak)so that their phase relations
- /archives//html/TenTec/2003-10/msg00810.html (9,401 bytes)
- 53. Re: [TenTec] RX-340 Problem (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 27 Oct 2003 15:46:19 -0500
- did you try hitting it? That often fixes or makes it worse. 73 Bill wa4lav At 03:24 PM 10/27/2003 -0500, you wrote: Yesterday, when I was using my Pegasus / RX-340 combo (using N4PY software), the to
- /archives//html/TenTec/2003-10/msg00814.html (8,896 bytes)
- 54. Re: [TenTec] Power Mite Odyssey (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 10 Nov 2003 13:26:08 -0500
- Good story, I have everything to put together my (not quite first) station but one thing. Remember, you had to have a Broadcast Band Receiver to monitor Coneirad stations? Oddly enough that broadcast
- /archives//html/TenTec/2003-11/msg00255.html (7,595 bytes)
- 55. Re: [TenTec] Power Mite Odyssey (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 10 Nov 2003 14:32:28 -0500
- At 02:29 PM 11/10/2003 +0000, johnwiseman@davidbowie.com wrote: Obviously, this receiver is not of the quality of even my first homebrew. A friend requested that put together his original station. He
- /archives//html/TenTec/2003-11/msg00257.html (9,536 bytes)
- 56. Re: [TenTec] Power Mite Odyssey (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Mon, 10 Nov 2003 14:37:15 -0500
- I have always wanted one of these BC receivers because the on I used was given to me by my father. And that was the first Stewart Warner radio I had ever had. I'd have to repaint it. The varsity seri
- /archives//html/TenTec/2003-11/msg00258.html (9,943 bytes)
- 57. Re: [TenTec] Power Mite Odyssey (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Tue, 11 Nov 2003 13:21:59 -0500
- Years ago I wrote an introduction for a boat anchor list server. And told story about my history. Many found it interesting but it was lengthy. Some of us have old and interesting histories and other
- /archives//html/TenTec/2003-11/msg00278.html (10,981 bytes)
- 58. Re: [TenTec] Problem w/Omni VI and INRAD filter (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Thu, 20 Nov 2003 09:45:12 -0500
- Sounds like they rely on the filter to eliminate the carrier as much as the null adjustments. Or that the filter's input impedance is critical to the carrier's null (unlikely). Either way, it from wh
- /archives//html/TenTec/2003-11/msg00576.html (9,425 bytes)
- 59. Re: [TenTec] Problem w/Omni VI and INRAD filter (score: 1)
- Author: Bill Fuqua <wlfuqu00@uky.edu>
- Date: Thu, 20 Nov 2003 13:14:43 -0500
- If they are ladder filters it drift may be mostly due to the quality of capacitors used. 73 Bill wa4lav At 12:20 PM 11/20/2003 -0500, K3BU@aol.com wrote: In a message dated 11/20/03 11:14:04 AM Easte
- /archives//html/TenTec/2003-11/msg00581.html (8,780 bytes)
- 60. Re: [TenTec] receiver intermod (score: 1)
- Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
- Date: Sun, 30 Nov 2003 22:56:03 -0500
- You have left out cross modulation. Cross-modulation is caused by the exact same nonlinearity that creates intermodulation. In that case amplitude modulation from one signal and is added to the signa
- /archives//html/TenTec/2003-11/msg00855.html (10,762 bytes)
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