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41. Re: [TenTec] Final Amplifier Class (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Sat, 1 Sep 2007 17:57:11 -0700
For background see http://en.wikipedia.org/wiki/Electronic_amplifier - What is the final amplifier class (A, AB, B or C) used in, say, the Ten-Tec OMNI VII and/or Orion II? I don't know for sure but
/archives//html/TenTec/2007-09/msg00012.html (12,172 bytes)

42. Re: [TenTec] Final Amplifier Class (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Sat, 1 Sep 2007 18:05:07 -0700
You can build AB or B amps from single or multiple devices. AB or B class amps don't have to be paired. The AB or B just refers to how the are switched on during the cycle. Just having one device wil
/archives//html/TenTec/2007-09/msg00013.html (9,059 bytes)

43. Re: [TenTec] power output of ten tec delta (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Sun, 2 Sep 2007 11:41:45 -0700
There was a habit some time ago of "power inflation" in marketing by quoting the DC input power rather than the output power. This seems to have seeped into various websites documenting the gear who
/archives//html/TenTec/2007-09/msg00030.html (9,434 bytes)

44. Re: [TenTec] power output of ten tec delta (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Sun, 2 Sep 2007 23:32:16 -0700
When I was first licensed in the UK (as G8UDP) in 1979 they used a similar scheme. http://www.ac6v.com/history.htm 1983 The 1000 watts input rule was replaced by a new "1500 watt peak output" rule. T
/archives//html/TenTec/2007-09/msg00056.html (10,837 bytes)

45. Re: [TenTec] delta 580 on 10 meters? (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Thu, 6 Sep 2007 17:59:22 -0700
Or even easier when you disconnect the antenna does the noise go down? When you reconnect it does it go up? If you can hear the difference then the ambient noise + galactic noise is higher than the n
/archives//html/TenTec/2007-09/msg00154.html (12,082 bytes)

46. Re: [TenTec] delta 580 on 10 meters? (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Fri, 7 Sep 2007 09:25:07 -0700
What sort of noise environment do you live in? Urban? Suburban? Rural? Quiet rural? If you are at the bottom end of the scale (lucky you!) then there won't be much of a change and you'll be limited b
/archives//html/TenTec/2007-09/msg00170.html (10,591 bytes)

47. Re: [TenTec] Ten Tec Net Frequencies & Times? (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Mon, 10 Sep 2007 15:51:29 -0700
IS0 8601 (the common date time notation used all over the net) permits the hours to be between 00 and 24 (inclusive!). <http://en.wikipedia.org/wiki/ISO_8601> <http://www.cl.cam.ac.uk/~mgk25/iso-time
/archives//html/TenTec/2007-09/msg00220.html (12,823 bytes)

48. Re: [TenTec] corair p.s. with paragon? (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Tue, 11 Sep 2007 18:04:56 -0700
It's also an improvement over the Argosy design that routed AC from the PSU to the front panel on/off switch and back to the PSU. In the xcvr the AC lines pass the audio boards so after some noise qu
/archives//html/TenTec/2007-09/msg00235.html (11,220 bytes)

49. Re: [TenTec] (no subject) (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Sun, 23 Sep 2007 17:12:16 -0700
The transistor "fry" because they heat up, their current gain increases and the collector current runs away. <http://en.wikipedia.org/wiki/Thermal_runaway#Bipolar_transistors> You aren't going to be
/archives//html/TenTec/2007-09/msg00386.html (10,693 bytes)

50. Re: [TenTec] PA current control (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Sun, 23 Sep 2007 23:21:33 -0700
Curiously this system is not used in early TT rigs -- Argosy, which has a trip in the PSU or a Airpax. And the Omni D (but I'm replying on memory for that). I take it you have tested you hypothesis b
/archives//html/TenTec/2007-09/msg00390.html (13,899 bytes)

51. Re: [TenTec] PA current control (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Tue, 25 Sep 2007 09:46:56 -0700
Excellent thread highlighting a unique TT feature. So TT introduced this feature after the Delta/Cosair (and the Argosy) which seems to put the timeframe in the mid-1980s (perhaps) with the Paragon 1
/archives//html/TenTec/2007-09/msg00402.html (11,655 bytes)

52. Re: [TenTec] Argosy 525D setup... (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Wed, 26 Sep 2007 09:26:56 -0700
525D spec <http://tentecwiki.org/doku.php?id=525d> There is a scan of the manual on the web (not perfect but not bad) for the final version of the 525D. This should get you operational. <http://www.q
/archives//html/TenTec/2007-09/msg00406.html (12,810 bytes)

53. [TenTec] Argosy 525/525D mixers and serial numbers revisited (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Wed, 26 Sep 2007 15:04:06 -0700
Thanks for your replies. I'm writing another reply but I realized that you help fill in more of the serial numbers on my list. See my old post <http://lists.contesting.com/archives//html/TenTec/2007-
/archives//html/TenTec/2007-09/msg00411.html (11,843 bytes)

54. [TenTec] Argosy RF attenuator mod (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Wed, 26 Sep 2007 15:21:10 -0700
Adding an attenuator to the Argosy is perhaps one of the best things you can do. The RF amp is always in circuit in the Argosy in front of the mixer which for the low bands is just not needed. The no
/archives//html/TenTec/2007-09/msg00412.html (10,152 bytes)

55. Re: [TenTec] paragon II performance on longwave band?? (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Wed, 26 Sep 2007 20:34:52 -0700
Nope, Tentec radios overall have excellent receiver performance. in partial response to John Ferro i love this radio, but i have found one negative with the paragon and that is LW reception. i somet
/archives//html/TenTec/2007-09/msg00420.html (10,521 bytes)

56. Re: [TenTec] For Sale: Ten Tec Argonaut V (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Fri, 28 Sep 2007 14:02:52 -0700
OT ... delete now! [...] Shipped to lower 48 for $725 (postal money order only). [...] "lower 48??" Ron, wb1hga "the 516 is a keeper" Did this come up here (or QRP-L?) recently? It's an odd phrase (w
/archives//html/TenTec/2007-09/msg00437.html (10,606 bytes)

57. Re: [TenTec] WTB external speaker 307G (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Sun, 30 Sep 2007 15:14:11 -0700
I don't know if this is the G version or not but Universal Radio have one used on 09/28/07 (been on their list for some time). <http://www.universal-radio.com/alert.html> UI44 TEN-TEC 307 EXT. SPEAKE
/archives//html/TenTec/2007-09/msg00476.html (8,455 bytes)

58. Re: [TenTec] Argonaut II/Delta II crystal filters (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Wed, 1 Aug 2007 09:31:13 -0700
Especially as Ten Tec holds a patent on the Jones Filter (until 2009). Interesting read. <http://www.google.com/patents?id=blsfAAAAEBAJ> I suspect Elecraft aren't using it (though I'd love to hear th
/archives//html/TenTec/2007-08/msg00007.html (10,220 bytes)

59. Re: [TenTec] Jones filters (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Wed, 1 Aug 2007 12:02:17 -0700
Hmmm, that's not what I wrote ... see the multiple levels of quoting. I provided the links. And yes I read them. Jones filter is a ten tec patent. Jones filter is a useful compromise for smaller devi
/archives//html/TenTec/2007-08/msg00010.html (10,409 bytes)

60. Re: [TenTec] triton 540 reversed polarity (score: 1)
Author: Kevin Purcell <kevinpurcell@pobox.com>
Date: Tue, 7 Aug 2007 10:38:22 -0700
Why not try to troubleshoot it rather than randomly changing parts? Do you have a signal source for audio and a tunable one for RF? Start injecting an AF signal at the speaker audio amp and work back
/archives//html/TenTec/2007-08/msg00139.html (11,911 bytes)

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