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41. Re: [TenTec] Orion as AM radio (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 01 May 2006 10:05:45 -0500
NO! NEVER! The overall efficiency of the high level plate modulated rig is better than any linear so there's less heat in the room for the same power output. It takes lots of modifications to the DX-
/archives//html/TenTec/2006-05/msg00025.html (10,048 bytes)

42. Re: [TenTec] Upcoming Field Day Planning questions and thoughts (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 01 May 2006 21:45:09 -0500
Works a lot better for FD than an 80 m dipole a half wave high. One time we had access to windmill towers that high and put one up. We couldn't work much at all around Iowa, but heard the coasts well
/archives//html/TenTec/2006-05/msg00056.html (8,049 bytes)

43. Re: [TenTec] Upcoming Field Day Planning questions and thoughts (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 02 May 2006 19:19:44 -0500
So your fingers warmed up when you touched the rig with key down. Low horizontal wires worked on 80 meters for eons before the term NVIS was invented to justify them replacing military specifications
/archives//html/TenTec/2006-05/msg00096.html (9,859 bytes)

44. Re: [TenTec] Scout PTO question (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Tue, 02 May 2006 19:22:14 -0500
Probably needs a bit more preload on the shaft bearings. Another brass washer at the back thrust washer location. I rebuilt the PTO in my Corsair II and left out one and it does the same thing. Less
/archives//html/TenTec/2006-05/msg00097.html (8,081 bytes)

45. Re: [TenTec] Orion - K3NA transmit audio chain articlenow onTen-Tecwebsite (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 03 May 2006 12:10:58 -0500
And I don't think its actually been done because this technique DOES NOT CREATE A LINE on the scope with SSB. It creates a trapezoid for AM only that you hope to have two straight lines as upper and
/archives//html/TenTec/2006-05/msg00126.html (12,539 bytes)

46. Re: [TenTec] 2.033 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 03 May 2006 14:45:03 -0500
The first book I read on noise reduction perhaps ten years ago concentrated on the correlation technique and I believe that is often used because it works but it leaves a background that is not very
/archives//html/TenTec/2006-05/msg00140.html (14,757 bytes)

47. Re: [TenTec] 937 PS troubleshooting (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 04 May 2006 10:01:35 -0500
I'd first suspect output cable connections, especially at the radio. Tentec and others have had problems. Then the fuse in the output DC circuit, then one of the pass transistors is likely open and t
/archives//html/TenTec/2006-05/msg00174.html (8,966 bytes)

48. Re: [TenTec] 2.033 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 04 May 2006 13:03:40 -0500
Filtering is easy for ONE CW signal, but how about three or 17 in the passband. Sure for working one you would want to filter out the rest, but say you were at an antipodal DX pedition location and c
/archives//html/TenTec/2006-05/msg00186.html (12,475 bytes)

49. Re: [TenTec] If you ground it - it will come! (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 05 May 2006 10:35:39 -0500
The rules on ground since at least 1916 depend only on grounds as if the earth was a ten foot thick slab of silver. It isn't and its not all that good a conductor though its better wet than dry. One
/archives//html/TenTec/2006-05/msg00237.html (11,503 bytes)

50. Re: [TenTec] If you ground it - it will come! (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Fri, 05 May 2006 14:24:04 -0500
Your braid and your #6 are the weak points. They have too much inductance. The power ground and antenna ground and telephone ground as well as radio grounds should be at least a foot wide copper, per
/archives//html/TenTec/2006-05/msg00246.html (9,641 bytes)

51. Re: [TenTec] If you ground it - it will come! (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 06 May 2006 10:31:34 -0500
The tower sometimes may discharge the surroundings, but its not an absolute guarantee of lightning prevention. Back in the early 60s my dad (K0CPN) and I put up a rotating mast. It stood until about
/archives//html/TenTec/2006-05/msg00265.html (14,702 bytes)

52. Re: [TenTec] If you ground it - it will come! (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 06 May 2006 11:09:37 -0500
Yes to both the copper table and thee faraday shield, though as a practical matter covering a wooden table with a copper sheet works as good as the solid block because the rapid rise of lightning cur
/archives//html/TenTec/2006-05/msg00266.html (12,030 bytes)

53. Re: [TenTec] re if you ground it - it will come! (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sat, 06 May 2006 21:28:16 -0500
Roofing flashing copper may yet be less expensive from vendors other than AES. Scrap copper hit $3 a pound in the last week or so. The world demand for copper is far greater than production these day
/archives//html/TenTec/2006-05/msg00282.html (8,978 bytes)

54. Re: [TenTec] If you ground it - it will come! (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 08 May 2006 09:17:54 -0500
In my experience with lightning damage, I've found that only the surface 1/64th inch melts from lighting current while the rest of the conductor stays solid. The associated magnetic fields push that
/archives//html/TenTec/2006-05/msg00309.html (11,175 bytes)

55. Re: [TenTec] roller inducter help (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 11 May 2006 10:15:19 -0500
It shouldn't be hard to repair the worn bushing hole. Probably drill it out larger and slip in a new bushing the larger OD to fit the new hole and the right size for the shaft or maybe a bushing that
/archives//html/TenTec/2006-05/msg00347.html (8,103 bytes)

56. Re: [TenTec] Relay for Corsair, argosy (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Wed, 17 May 2006 21:49:22 -0500
Use the standard automotive cube relay. Its good for 30 amps and the coil current is small enough for the switch contacts. When you wire it in, put a diode in series with the coil to act as reverse p
/archives//html/TenTec/2006-05/msg00513.html (8,139 bytes)

57. Re: [TenTec] Relay for Corsair, argosy (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Thu, 18 May 2006 22:14:23 -0500
The radio switch controlling the AC primary of the power supply is exactly how Tentec intended it to be used. I use a master station supply for several radios and tncs and so I used the relay in the
/archives//html/TenTec/2006-05/msg00541.html (9,040 bytes)

58. Re: [TenTec] corsair scrambled&scrachy audio (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 28 May 2006 20:31:38 -0500
You don't need an amplified microphone. And you only get about 20% average power from voice on SSB. That is 20% of peak. Trying to drive up more than about 20% of peak power will cause lots of splatt
/archives//html/TenTec/2006-05/msg00720.html (8,475 bytes)

59. Re: [TenTec] RF in Audio Mods for Jupiter (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Sun, 28 May 2006 20:34:47 -0500
On top of these, make sure your coax has more than 65% braid (typical from Radio Shack) because that little copper doesn't do good at keeping RF inside the coax. Good coax costs money and really shie
/archives//html/TenTec/2006-05/msg00721.html (9,867 bytes)

60. Re: [TenTec] FT-2000 Webpage (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
Date: Mon, 29 May 2006 11:33:05 -0500
Besides the difficulties of making a sharp filter at 45 or 75 MHz, there are some other factors. For sure the Yeacomwood roofing filter has to be 15 KHz wide as a minimum to pass FM for the top end o
/archives//html/TenTec/2006-05/msg00738.html (9,320 bytes)

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