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41. Re: [Amps] Centurion cooling improvement ideas for AM service (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 26 Aug 2004 18:15:38 -0400
Actually, 5 kHz of audio equates to an AM bandwith of 10 kHz. Each AM sideband contains the same 5 kHz of information. If the only objective is to communicate using the least amount of necessary ban
/archives//html/Amps/2004-08/msg00346.html (10,809 bytes)

42. Re: [Amps] Centurion cooling improvement ideas for AM service (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 26 Aug 2004 20:36:35 -0400
It is not IM. An excellent discussion concerning the effect you're hearing is well-documented on the NU9N web site. As audio approaches the carrier set point in the lower audio octaves, to the ear i
/archives//html/Amps/2004-08/msg00363.html (9,254 bytes)

43. Re: [Amps] Wide Band Audio (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 27 Aug 2004 14:37:36 -0400
those guys going inside their radios and modifying them too". My god what has this hobby come to? Actually, that comment was in fact voiced by none other than Riley Hollingsworth who, incredibly eno
/archives//html/Amps/2004-08/msg00399.html (7,391 bytes)

44. Re: [Amps] Audio BW -- Please just let us operate!! (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 27 Aug 2004 15:27:48 -0400
A good point, Vic -- and to the League's point in their proposal, I believe the intent is to foster emerging digital technologies to do just what you describe. In fact, not only is the technology he
/archives//html/Amps/2004-08/msg00401.html (9,691 bytes)

45. Re: [Amps] ARCO compression trimmer caps (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 11 Sep 2004 09:58:55 -0400
Check with R.F. Parts Company - see link below. They may even be able to send you the mounting nut alone. http://www.rfparts.com/trimmer.html -Paul, W9AC ____________________________________________
/archives//html/Amps/2004-09/msg00191.html (9,030 bytes)

46. Re: [Amps] ARCO compression trimmer caps (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 11 Sep 2004 10:29:54 -0400
Also, check with Bob Grinnell at Surplus Sales of Nebraska. Their minimum order amount may be less than R.F. Parts Company. http://www.surplussales.com/Variables/Compression/CompCap1.html -Paul, W9AC
/archives//html/Amps/2004-09/msg00195.html (10,122 bytes)

47. Re: [Amps] Getting Filament Voltage on an AL-82 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 19 Sep 2004 08:22:17 -0400
Actually, the resistors will affect the reading, but if you have a very high impedance DVM the effect will be small. I prefer to not use resistors so that I could use any voltmeter I have and not hav
/archives//html/Amps/2004-09/msg00331.html (8,712 bytes)

48. [Amps] Alpha-Power Web Site (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 19 Jan 2005 09:50:33 -0500
Alpha's web site seems to be down for the past several days. Anyone have a better link that works? http://www.alpha-amps.com/ -Paul, W9AC _______________________________________________ Amps mailing
/archives//html/Amps/2005-01/msg00363.html (6,250 bytes)

49. Re: [Amps] Websites. (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 29 Jan 2005 16:50:38 -0500
The author of that particular web site makes it clear that the information presented comes from several stated sources. While I do not necessarily agree with some of his concepts, as long as the sou
/archives//html/Amps/2005-01/msg00587.html (7,510 bytes)

50. Re: [Amps] YC-156 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 13 Feb 2005 21:20:39 -0500
life, Many years ago, I managed the Jacksonville Lodestar communications facility where one FM transmitter, now owned by Clear Channel, uses the 816R5. That transmitter should have never been design
/archives//html/Amps/2005-02/msg00468.html (8,028 bytes)

51. Re: [Amps] TL-922 Help (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 24 Feb 2005 14:01:53 -0500
For directly-heated cathode tubes used in broadcast transmitters, both Eimac and the transmitter manufacturers generally recommend the following procedure for placing a new Final tube into service:
/archives//html/Amps/2005-02/msg00763.html (8,036 bytes)

52. Re: [Amps] Shipping Damage (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 24 Feb 2005 14:20:57 -0500
their increased Incredible. So the shipper's solution to the "long term problem" was to burden the customer -- not conduct a root-cause-analysis into the problem. It's pretty hard to believe that in
/archives//html/Amps/2005-02/msg00766.html (9,740 bytes)

53. Re: [Amps] Shipping Damage (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 25 Feb 2005 23:34:20 -0500
I cannot imagine anyone handing over a 77Dx to the UPS Store for packing & shipment without critically examining and accepting the packing procedure. In such a case, the selling party contributes to
/archives//html/Amps/2005-02/msg00846.html (8,938 bytes)

54. Re: [Amps] shipping damge (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 26 Feb 2005 15:44:06 -0500
word. But generally subject to the terms and conditions as described in the air-bill/waybill (usually on the reverse side). It's been a while since I've read the complete fine print for the major sh
/archives//html/Amps/2005-02/msg00861.html (8,264 bytes)

55. [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 4 Mar 2005 09:22:56 -0500
Last week's discussion of GG filament chokes got me thinking about modifying my Alpha 77Dx which I believe, ties one side of the filament to the cathode. I would like to cut this tie and user a R.F.
/archives//html/Amps/2005-03/msg00046.html (7,589 bytes)

56. Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 4 Mar 2005 09:30:45 -0500
Whoops - my mistake. The 77Dx's 8877 does not tie the cathode and filament together. One side of the filament is grounded. Would it still be advisable to add the common-mode filament choke anyway? -P
/archives//html/Amps/2005-03/msg00047.html (8,598 bytes)

57. Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 4 Mar 2005 13:27:30 -0500
between a tube in In the case of the 77Dx (but not the Sx -- see below), it appears quite easy to fully isolate the heater. According to the schematic, the heater transformer secondary is grounded a
/archives//html/Amps/2005-03/msg00061.html (9,988 bytes)

58. Re: [Amps] Alpha 77Dx -Adding Grounded Grid Filament Choke (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 4 Mar 2005 19:25:30 -0500
a Mine too - like 245V. I think a better solution in the initial 77Dx design (and all amp designs for that matter) would have been to use an independent filament transformer to allow for the control
/archives//html/Amps/2005-03/msg00070.html (9,717 bytes)

59. Re: [Amps] Parasitic suppression kits (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 19 Mar 2005 09:39:42 -0500
...And no less useful than the common inductor-formed-around-a-carbon-resistor as the parasitic suppressor. Even assuming there is no benefit to the Nichrome-style suppressor...at the end of the day
/archives//html/Amps/2005-03/msg00415.html (6,770 bytes)

60. Re: [Amps] a common topic here tspa (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 4 Apr 2005 16:55:52 -0400
Then, can we agree that the AL-1500 is the only commercially-manufactured multi-band amplifier (2-30MHz) on this planet that uses no parasitic suppressor? -Paul, W9AC _______________________________
/archives//html/Amps/2005-04/msg00088.html (6,998 bytes)

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