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41. Re: [TenTec] OT (that is Off Topic and Old Timers) BC-610 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 04 Sep 2009 20:24:09 -0600
Hallicrafters, essentially an HT-4 ruggedized. Film at: http://www.archive.org/details/VoiceofV1944 There are two parts. The main contributions from Collins in WW2 were the ARC-2 and ART-13. The ART-
/archives//html/TenTec/2009-09/msg00034.html (9,196 bytes)

42. Re: [TenTec] OT (that is Off Topic and Old Timers) BC-610 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sat, 05 Sep 2009 09:28:38 -0600
With the engines running the ART-13 didn't change the noise level at all, except in receivers. That era military aircraft didn't consider the hearing of crew members was crucial to the mission. Last
/archives//html/TenTec/2009-09/msg00048.html (11,316 bytes)

43. Re: [TenTec] 262G Schematic (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 06 Sep 2009 02:52:12 -0600
The standard connections like on a Corsair II are: Pin 1 (bottom of rig) is ground. Pins 2 and 3 are the switch on the radio volume control. Won't handle more than a couple amps. Its intended to swit
/archives//html/TenTec/2009-09/msg00058.html (7,324 bytes)

44. Re: [TenTec] Omni C help.... (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 06 Sep 2009 20:25:35 -0600
Its NOT a Molex, its an AMP. Different pin dimensions. The pins are probably crimped to the wires, not soldered. The pins release from the shells like Molex pins though, but probably take different t
/archives//html/TenTec/2009-09/msg00072.html (8,661 bytes)

45. Re: [TenTec] Ten-tec 962 ps problem problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 06 Sep 2009 20:35:25 -0600
Its probably a standard part. Square, metal case with spade lugs for the four connections? Tentec probably has the part. Mouser probably has the part. Diodes tend to fail shorted when overheated. So
/archives//html/TenTec/2009-09/msg00073.html (9,059 bytes)

46. Re: [TenTec] OT (that is Off Topic and Old Timers) BC-610 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 06 Sep 2009 20:21:01 -0600
The B-1B was about that loud with the afterburners kicked in. Congrats to your son. I graduated, not with honors, but I took too many advanced and honors sequence courses and fell in amongst the real
/archives//html/TenTec/2009-09/msg00074.html (11,081 bytes)

47. Re: [TenTec] Orion drops lock? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 21 Sep 2009 10:16:36 -0600
Often an intermittent can be forced by applying alternate heating and cooling. A hair dryer or hot air gun supplies heat and a spray can product like Freeze-Mist or even the dry air lens cleaners pro
/archives//html/TenTec/2009-09/msg00189.html (9,087 bytes)

48. Re: [TenTec] Orion drops lock? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 21 Sep 2009 15:05:52 -0600
That's true, but by applying the heat and cold technique you can isolate the most temperature sensitive capacitor or coil and that's most likely in a VCO that needs a change in alignment. Turning the
/archives//html/TenTec/2009-09/msg00192.html (12,505 bytes)

49. Re: [TenTec] Loud fan PS 963 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 27 Sep 2009 17:46:36 -0600
Fans are made noisy and are made quiet. Noise can be bearings or wind. Bearing noise indicates a need for lubrication. Usually its right through the middle of the label on a muffin fan. Cut an X with
/archives//html/TenTec/2009-09/msg00268.html (9,805 bytes)

50. Re: [TenTec] Omni 5 Feedback (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 28 Sep 2009 21:20:00 -0600
Usually motor boating and rumbling feed back are a sign that the power supply bypass electrolytics have gone nearly open or have gone way down in value. That's not only the main power supply but the
/archives//html/TenTec/2009-09/msg00284.html (8,379 bytes)

51. Re: [TenTec] Omni 5 Feedback (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 28 Sep 2009 22:11:00 -0600
Nah, an open cathode bypass just cuts the gain, makes the stage more stable from the inverse feedback of the unbypassed cathode resistor. Its power supply bypassing going low in value that lets the r
/archives//html/TenTec/2009-09/msg00286.html (9,186 bytes)

52. Re: [TenTec] Loud fan PS 963 (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 29 Sep 2009 09:03:25 -0600
Consider the fact that many Tentec radios depend on the current limiting of the Tentec supply to be the SWR protection for the PA transistors. That you sacrifice when using the Astron supply which ca
/archives//html/TenTec/2009-09/msg00291.html (10,328 bytes)

53. Re: [TenTec] FS:Scout (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Wed, 30 Sep 2009 13:39:07 -0600
That's called a Dutch Auction. Used a lot in the Netherlands for commodities and flowers. Most hamfests turn into Dutch Auctions, not necessarily so formally as the one you reported. Buyers often wai
/archives//html/TenTec/2009-09/msg00308.html (8,648 bytes)

54. Re: [TenTec] OMNI-VI problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Mon, 05 Oct 2009 10:18:03 -0600
<SNIP> Actually the synthesizer is up in the 450 to 500 MHz region for better phase noise and then divided down to 5 to 5.5 MHz where its used alone for 80 and 20 and mixed with a crystal for the oth
/archives//html/TenTec/2009-10/msg00028.html (9,089 bytes)

55. Re: [TenTec] OMNI-VI problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 06 Oct 2009 11:11:41 -0600
I thought it was synthesized at a higher frequency for more phase noise reduction by division. But I've not studied an Omni V or VI manual later. I was interested in using one for VHF transverter IF
/archives//html/TenTec/2009-10/msg00038.html (12,006 bytes)

56. Re: [TenTec] Omni VI driver problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 06 Oct 2009 17:41:04 -0600
RF parts has some applications notes on using ERF2030 in some 10m/11m radios, but not in pairs. 73, Jerry, K0CQ _______________________________________________ TenTec mailing list TenTec@contesting.c
/archives//html/TenTec/2009-10/msg00050.html (8,719 bytes)

57. Re: [TenTec] OMNI-VI problem (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Tue, 06 Oct 2009 17:45:30 -0600
What's the battery voltage under load (e.g. power off)? When's the last time the battery was replaced? Might be time for a new battery. Might be a problem with the power supply to the microprocessor,
/archives//html/TenTec/2009-10/msg00052.html (9,122 bytes)

58. Re: [TenTec] CW filter for Omni-VI+.... What model? 250Hz, 9MHz... LOW TONE CW!?? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Fri, 09 Oct 2009 13:29:22 -0600
More properly its the frequency of the crystals that set the center frequency, the capacitors set the coupling between crystals, and the bandpass. Dragging the crystals with different capacitors migh
/archives//html/TenTec/2009-10/msg00089.html (9,188 bytes)

59. Re: [TenTec] CW filter for Omni-VI+.... What model? 250Hz, 9MHz... LOW TONE CW!?? (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 11 Oct 2009 12:28:20 -0600
In the ladder filter, both the crystal series resonant frequency and the Q of that resonance is critical. I think a high Q crystal comes from how close the faces of the (AT cut) crystal are to parall
/archives//html/TenTec/2009-10/msg00114.html (13,414 bytes)

60. Re: [TenTec] Argonaut 509 sidetone "pop" (score: 1)
Author: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Date: Sun, 11 Oct 2009 12:35:23 -0600
A power MOSFET (like the IRF-510, RS# 276-2072) with 5 to 10 volts of gate drive will have a saturation voltage of less than 20 millivolts while the bipolar will do hard to get that drop to less than
/archives//html/TenTec/2009-10/msg00115.html (9,040 bytes)

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