Mail Archive Search: <+from:w7iuv@nis4u.com>

Results:

References: [ +from:w7iuv@nis4u.com: 66 ]

Total 66 documents matching your query.

41. [AMPS] Wire size (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Thu, 03 Feb 2000 05:47:28 +0000; Vic, I'd use double-ought welding cable. (guage 00) It might be big enough! The concern is not what the cable can handle, but what the voltage drop would be. If you want max output and efficiency fro; /archives//html/Amps/2000-02/msg00019.html (8,115 bytes)
42. [AMPS] Power Supply Diodes (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Fri, 04 Feb 2000 00:24:26 +0000; Phil, The Digikey catalog has been opened to that very page for three days now. I'm just waiting for a free moment to make up an order. Larry - W7IUV -- FAQ on WWW: http://www.contesting.com/ampsfaq.; /archives//html/Amps/2000-02/msg00058.html (9,414 bytes)
43. [AMPS] Power Supply Diodes (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Fri, 04 Feb 2000 00:30:27 +0000; Ah, the joys of modular amplifiers! It only took two minutes to jack in the "old" supply and check out all the RF and control stuff. All as it should be. Each component in the "new" supply was indivi; /archives//html/Amps/2000-02/msg00059.html (10,343 bytes)
44. [AMPS] Power Supply Diodes (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Fri, 04 Feb 2000 00:21:40 +0000; As per my old Motorola Silicon Rectifier Manual, Max NON-REPETITIVE surge current (one cycle) is 200 amps Max NON-REPETITIVE surge current (100 cycles) is 50 amps From the same manual, charts from O.; /archives//html/Amps/2000-02/msg00060.html (10,376 bytes)
45. [AMPS] Power Supply Diodes (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Fri, 04 Feb 2000 00:40:27 +0000; The white paint says "RT", any guess on that one? At the time of failure, the calculated safety factor was 44.5%. I guess that's a bit marginal. Still it should not have quit. I have the parts in a b; /archives//html/Amps/2000-02/msg00061.html (9,121 bytes)
46. [AMPS] Power Supply Diodes (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Fri, 04 Feb 2000 22:33:52 +0000; Steve, thanks for the Spice run. Very interesting. My actual output voltage at key down was 3100, key up (ZSAC) was about 3400. Using the graphs, I had estimated about 2.9 amps RMS current. But what; /archives//html/Amps/2000-02/msg00072.html (9,263 bytes)
47. [AMPS] Power Supply Diodes (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Tue, 08 Feb 2000 00:18:12 +0000; Amen, Peter! Since I have never before been able to make a HV, cap filter, supply work to my satisfaction, I am going to make a real effort on this one. Since I asked the original question, there hav; /archives//html/Amps/2000-02/msg00100.html (10,323 bytes)
48. [AMPS] Noise Nuller Info (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Wed, 09 Feb 2000 22:48:11 +0000; Dan, N5AR, has compiled a description of his "Noise Nuller" experiences, complete with schematics. Since Dan had no other means of posting this info, I scanned it for him and have put it on my "Homeb; /archives//html/Amps/2000-02/msg00157.html (6,934 bytes)
49. [AMPS] Amp Pix (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Sat, 19 Feb 2000 15:46:54 +0000; Gerard, VE5FF, Has sent in some additional photos of his 8169 amp project. I have appended them to the existing VE5FF page. You can see them, as usual at: http://207.108.137.61 By the way Gerard, can; /archives//html/Amps/2000-02/msg00365.html (6,706 bytes)
50. [AMPS] More AMP pix (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Mon, 21 Feb 2000 22:49:25 +0000; We have a few images of a nice 2 meter 8877 amp by Peter, VE3AX, now available on the AMPS PIX page. As usual: http://207.108.137.61 Enjoy, Larry - W7IUV -- FAQ on WWW: http://www.contesting.com/amps; /archives//html/Amps/2000-02/msg00452.html (6,621 bytes)
51. [AMPS] N Connectors (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Fri, 25 Feb 2000 22:54:00 +0000; During some research activities I did a number of years ago, I discovered MIL specs that suggested the max power for "N" connectors was approximately 800 watts at 150 MHz. If you look at that connect; /archives//html/Amps/2000-02/msg00580.html (8,262 bytes)
52. [AMPS] N Connectors (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Sat, 26 Feb 2000 18:57:04 +0000; Good information, Jon. Thanks. Is the spec you quoted a recent commercial spec or an (old) MIL spec? Also, do you have altitude derating info? What is the spec for a BNC? Thanks & 73, Larry - W7IUV -; /archives//html/Amps/2000-02/msg00588.html (8,803 bytes)
53. [AMPS] Question: input Z on class AB gnd grid pair 4-400 ?? (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Wed, 12 Jan 2000 22:49:27 +0000; 70 ohms for a pair. 73, Larry - W7IUV -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@; /archives//html/Amps/2000-01/msg00241.html (8,813 bytes)
54. [AMPS] Re:Question: input Z on class AB gnd grid pair4-400 ?? (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Thu, 13 Jan 2000 23:03:31 +0000; Steve, That's just what I thought some years ago. since I saw so many cross-cooled amps being built, I decided to de-bunk that idea myself. I built a mono-band amp with a pair of 4-400A's. Put the so; /archives//html/Amps/2000-01/msg00267.html (8,878 bytes)
55. [AMPS] New AMP Pix and "Power" (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Fri, 14 Jan 2000 23:38:55 +0000; The other day I received a photo submission from "anonymous". Not a lot of pix and no text, but still interesting. It's available for your inspection at the usual place: http://207.108.137.61 By the; /archives//html/Amps/2000-01/msg00297.html (7,196 bytes)
56. [AMPS] Simplified Approach To Power Measurement (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Sat, 15 Jan 2000 02:15:04 +0000; Colin, Not having an electric skylight, I've never had the oppertunity to use that method. Around here, power measurement is somewhat less subtle: If no one complains, power out is too low. If there; /archives//html/Amps/2000-01/msg00302.html (8,271 bytes)
57. [AMPS] RF Choke Forms (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Sat, 15 Jan 2000 15:14:10 +0000; Arne, I have successfully used Teflon and G10 epoxy forms for Plate chokes on HF at 1500 Watt power levels. Delrin and nylon are no-no's. There are other plastics that are suitable, but probably not; /archives//html/Amps/2000-01/msg00314.html (9,771 bytes)
58. [AMPS] RF Choke Forms (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Sat, 15 Jan 2000 17:55:06 +0000; Interesting test, Rich. I will have to give that a try. (Next time I have a dipole!) I have had excellent results using acrylic and/or polycarbonate materials as end insulators and as inslators in th; /archives//html/Amps/2000-01/msg00323.html (8,910 bytes)
59. R: [AMPS] RF Choke Forms (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Sat, 15 Jan 2000 18:05:18 +0000; Sure does. Therefor one should never cut Teflon with an acetylene torch unless one wears mil-spec chemical warfare apparel. Seriously, I have never seen Teflon ignite except when used as a dielectric; /archives//html/Amps/2000-01/msg00324.html (8,352 bytes)
60. [AMPS] RF Choke Forms (score: 1): Author: w7iuv@nis4u.com (Larry Molitor); Date: Sat, 15 Jan 2000 23:04:15 +0000; Since they are already tubular, I'm most familiar with plumbing PVC's. In the 30 years or so that these materials have been readily available, I have yet to find any that has relatively poor RF perfo; /archives//html/Amps/2000-01/msg00340.html (10,303 bytes)

Current List: 41 - 60
Page: [1] [2] [3] [4]