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41. Re: [Amps] High SWR (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Thu, 23 Apr 2009 13:27:13 -0400; Paul, Not really of the don't care about SWR camp and I have the instrumentation to measure all the parameters you mention, It's just that for those not versed in transmission line theory - SWR is pr; /archives//html/Amps/2009-04/msg00271.html (10,975 bytes)
42. Re: [Amps] High SWR (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Thu, 23 Apr 2009 14:02:28 -0400; In the case of a broadcast system you are setting up a single frequency system and you want all the components to have an impedance match as you want as much of the power as humanly possible to be ra; /archives//html/Amps/2009-04/msg00277.html (10,849 bytes)
43. Re: [Amps] High SWR (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Thu, 23 Apr 2009 14:30:45 -0400; You ask GOOG delivers QST, vol. 31, pp. 50-53; September,. 1947. http://forums.qrz.com/showthread.php?t=154490&highlight=lecher _______________________________________________ Amps mailing list Amps@; /archives//html/Amps/2009-04/msg00280.html (10,116 bytes)
44. Re: [Amps] High SWR (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Thu, 23 Apr 2009 16:03:20 -0400; Perhaps I was oversimplfying - I spend much of my day distilling complex technical issues to bullets the non-technical can understand. I meant single frequency as opposed to frequency agile transmitt; /archives//html/Amps/2009-04/msg00288.html (10,805 bytes)
45. Re: [Amps] High SWR (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Thu, 23 Apr 2009 20:25:26 -0400; But its fun and thats why we do ham radio and people keep climbing everest! - Scott _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m; /archives//html/Amps/2009-04/msg00298.html (9,308 bytes)
46. Re: [Amps] Radio Switch/Multi-Tech (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Fri, 24 Apr 2009 10:27:49 -0400; Drive punches and V-blocks You need to set up a support on the shaft between the wafers and drive out the pins with either a small arbor press or HIGH QUALITY punches think Starrett not Harbor Freigh; /archives//html/Amps/2009-04/msg00312.html (7,964 bytes)
47. Re: [Amps] Dummy Load "Oil" (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Wed, 29 Jul 2009 11:34:13 -0400; Everything else is flammable with the possible exception of propylene glycol which is used for filling projection TV tubes but it is also expensive and I'm not sure of the dielectric properties - you; /archives//html/Amps/2009-07/msg00353.html (7,825 bytes)
48. Re: [Amps] Dummy Load "Oil" (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Wed, 29 Jul 2009 12:22:00 -0400; Even though you have a large load much of that cost may be hazmat shipping fees as silicone oil is an irritant agent. I would still call Bird on a service/refill job however another source for silico; /archives//html/Amps/2009-07/msg00358.html (8,233 bytes)
49. Re: [Amps] Mouse droppings (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Sat, 1 Aug 2009 14:42:00 -0400; Ammonia is slightly basic so you will need a weak acid wash. What I would do is wash the chassis with palmolive with a little vinegar added - Rinse thoroghly and then dry it in a oven which you can m; /archives//html/Amps/2009-08/msg00008.html (9,407 bytes)
50. Re: [Amps] THANKS SCOTT RE: NEED PLATE TRANSFORMER FOR HENRY 3K OR HENRY 4K (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Fri, 7 Aug 2009 09:44:55 -0400; I'm on a bunch of technical lists and while many people do actually check the manufacturer - it seems that many more do not! on one of the Icom lists we had a fellow asking where he could purchase so; /archives//html/Amps/2009-08/msg00123.html (11,306 bytes)
51. Re: [Amps] NEED PLATE TRANSFORMER FOR HENRY 3K OR HENRY 4K (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Fri, 7 Aug 2009 07:24:11 -0400; Henry Radio has spares as well as RadioDan.com It always amazes me that on all the technical lists I subscribe to people NEVER check the manufacturer. In many cases the answer will be no but it never; /archives//html/Amps/2009-08/msg00126.html (8,561 bytes)
52. Re: [Amps] 240V Outlet (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Wed, 12 Aug 2009 20:28:00 -0400; One fact lost in the 15 vs 20 amp outlet discussion is the NEC requires you to derate any circuit to 80pct of its full load capacity for loads which are steady state. So a 20A circuit is allowed only; /archives//html/Amps/2009-08/msg00296.html (9,680 bytes)
53. Re: [Amps] 240V Outlet (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Wed, 12 Aug 2009 20:54:00 -0400; Yes - but an amp at contest time usually runs more than 3 hours at a shot. When I rewired the shack I used EMT so that in the event electical needs changed I could just pull new wires. Installing EMT; /archives//html/Amps/2009-08/msg00299.html (9,919 bytes)
54. Re: [Amps] I dont accept answers to why did Heath die? (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Mon, 1 Feb 2010 11:43:18 -0500; In a word Zenith, Heath would probably still be around if Zenith had not purchased them for the Heath computer products line, And as per usual the Zenith guys who were consumer products guys could no; /archives//html/Amps/2010-02/msg00014.html (16,700 bytes)
55. Re: [Amps] Fleamarkets (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Tue, 2 Feb 2010 08:40:10 -0500; Unfortunately due to the loss of electronic manufacturing in the US, The majority of the technical population in the US has NEVER constructed an electronic device and parts sources are few and far be; /archives//html/Amps/2010-02/msg00075.html (9,516 bytes)
56. Re: [Amps] Fleamarkets (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Tue, 2 Feb 2010 11:14:45 -0500; But the larger problem is where are new hams and budding engineers going to SEE those components and learn to recognize them, My dad (chemical engineer) helped me build radio receivers and other elec; /archives//html/Amps/2010-02/msg00080.html (13,213 bytes)
57. Re: [Amps] Fleamarkets (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Tue, 2 Feb 2010 11:36:39 -0500; I live in Cowtown usa 3500 people 15,000 cows you can smell them on a warm summer night but it's a good smell unless you are from the city - but unlike some areas we still have sufficient water (and; /archives//html/Amps/2010-02/msg00082.html (8,711 bytes)
58. Re: [Amps] Fleamarkets (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Tue, 2 Feb 2010 12:29:07 -0500; Miiiillllkkkk. You can also hear them quite well in the mornings and evenings - we have a Hood Dairy processing plant about 8 miles from my house. Milk and Ice Cream is produced from the raw milk. Wh; /archives//html/Amps/2010-02/msg00088.html (9,142 bytes)
59. Re: [Amps] Fleamarkets and more (score: 1): Author: Scott McGrath <mcgrath@fas.harvard.edu>; Date: Tue, 2 Feb 2010 13:10:01 -0500; To some extent it is - in large part that's why I became a technical mentor for FIRST robotics www.usfirst.org, But how many of us belong to the local ham club and become Elmers for new hams, In my c; /archives//html/Amps/2010-02/msg00090.html (9,005 bytes)

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