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41. Re: [Amps] Overdrive protection (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 26 Jul 2012 12:23:22 -0700
Well, this isn't Alpha's problem. They shouldn't have to castrate their protection circuit so that the amplifier can be used with transceivers that are defective. Aren't these spikes themselves dange
/archives//html/Amps/2012-07/msg00279.html (10,038 bytes)

42. Re: [Amps] Overdrive protection (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Fri, 27 Jul 2012 08:32:20 -0700
In some cases it depends on how you adjust the transceiver. The TS930s had both a Carrier control and a Power control active in CW mode. The power control set the point at which the ALC would hold th
/archives//html/Amps/2012-07/msg00306.html (12,512 bytes)

43. Re: [Amps] Dedicated RF (score: 1)
Author: "Vic, K2VCO" <k2vco.vic@gmail.com>
Date: Sat, 28 Jul 2012 16:19:11 -0700
One thing is that FCC rules now say that they can sell an amp that works on 10/12 meters IF it doesn't work on CB frequencies. The only way to do this is with some kind of frequency counter which mea
/archives//html/Amps/2012-07/msg00345.html (9,482 bytes)

44. Re: [Amps] Al80b (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Mon, 30 Jul 2012 10:43:54 -0700
I believe that he is getting some kind of meter to tell him that he is getting 800 watts output. I doubt that he is. I don't know of any commercially available wattmeter that is accurate when the SWR
/archives//html/Amps/2012-07/msg00424.html (11,271 bytes)

45. Re: [Amps] opps (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Wed, 08 Aug 2012 19:01:20 -0700
One thing is that the parasitic suppressor is between the plate and the RF choke and NOT between the plate and the tank circuit! -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ____________________
/archives//html/Amps/2012-08/msg00133.html (7,071 bytes)

46. [Amps] 4CX1500B project (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Wed, 08 Aug 2012 20:06:50 -0700
I've been thinking about my next project for some time, and I can't seem to shake the idea of an 160-10M amplifier using the 4CX1500B. The tubes and the beautiful SK-800B socket are just burning a ho
/archives//html/Amps/2012-08/msg00136.html (7,788 bytes)

47. Re: [Amps] 4CX1500B project (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Wed, 08 Aug 2012 21:50:42 -0700
Because as I understand it, the tubes are essentially the same except for a slightly larger anode cooler which accounts for the additional dissipation. The parameters for typical operation on the 4CX
/archives//html/Amps/2012-08/msg00140.html (8,328 bytes)

48. Re: [Amps] 4CX1500B project (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 09 Aug 2012 08:15:00 -0700
Good points. I had thought that maybe I would need a little inductor in the grid circuit on 10/15m. I wonder if it would work to put it in series with the swamping resistor? The idea would be to tune
/archives//html/Amps/2012-08/msg00148.html (10,732 bytes)

49. Re: [Amps] 4CX1500B project (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 09 Aug 2012 09:02:54 -0700
That's an idea. I was thinking about a CW/SSB switch labeled "IMD ON/OFF". It could change plate, grid and screen voltages. I don't think I'll go as far as class C, though. I can get 1500 watts in AB
/archives//html/Amps/2012-08/msg00151.html (11,572 bytes)

50. Re: [Amps] 4CX1500B project (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 09 Aug 2012 09:07:37 -0700
And come up with great ideas! -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailm
/archives//html/Amps/2012-08/msg00154.html (10,683 bytes)

51. Re: [Amps] TL922A recommended mods? (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Tue, 14 Aug 2012 09:01:24 -0700
Jim, The clunky relay is actually dangerous, because it is so slow that it will hot-switch with semi-QSK CW. This is the reason for the spark gap that is installed in the stock model, and (in my opin
/archives//html/Amps/2012-08/msg00203.html (13,046 bytes)

52. [Amps] Transformer guess? (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Sun, 26 Aug 2012 13:20:47 -0700
I have a small power transformer here, Philco 45-7011-7, which I would like to use for a screen supply. It has the usual center tapped HV winding, which measures 380-0-380v, just right, as well as 5v
/archives//html/Amps/2012-08/msg00452.html (7,476 bytes)

53. Re: [Amps] Transformer guess? (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Mon, 27 Aug 2012 15:22:44 -0700
I haven't had a chance to actually try this yet, but since I am sitting at my 'work' computer, I simulated it with the PSU Designer program (which I think came with a recent ARRL handbook). I entered
/archives//html/Amps/2012-08/msg00488.html (10,245 bytes)

54. [Amps] Small transformer evaluation (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Sat, 01 Sep 2012 13:37:10 -0700
Some of you will remember that I was wondering about utilizing a small Philco power transformer (model 45-7011-7) for a screen supply. It puts out 380-0-380 vac plus 5 and 6 v for filaments. I have h
/archives//html/Amps/2012-09/msg00002.html (7,903 bytes)

55. Re: [Amps] Small transformer evaluation (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Sat, 01 Sep 2012 14:18:46 -0700
I switched to capacitor input and changed the load to 5300 ohms. Now I am getting 438V and 83 MA. I stuck a fuse on the transformer just in case and I will let it run for a while. It is noticeably wa
/archives//html/Amps/2012-09/msg00005.html (8,449 bytes)

56. Re: [Amps] Small transformer evaluation (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Sat, 01 Sep 2012 14:20:58 -0700
It's going to feed a transistor regulator. I'm sure it will be a capacitor filter because of the voltage. Some of you will remember that I was wondering about utilizing a small Philco power transform
/archives//html/Amps/2012-09/msg00006.html (8,563 bytes)

57. Re: [Amps] Small transformer evaluation (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Sat, 01 Sep 2012 20:39:35 -0700
Interesting idea. Nominal screen current is 35 mA and voltage is 325. Current goes negative in zero-signal state so the regulator has to deal with that. I want to be able to vary screen voltage for e
/archives//html/Amps/2012-09/msg00016.html (9,627 bytes)

58. Re: [Amps] Alpha &&DX Conversion (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Wed, 05 Sep 2012 14:57:10 -0700
Paul, Don't forget that the FM transmitter was probably running class-C which might be 75% efficient compared to the 60% or so available in class AB1/2. On 9/5/2012 2:48 PM, Paul Christensen wrote: "
/archives//html/Amps/2012-09/msg00066.html (9,427 bytes)

59. Re: [Amps] MFJ products (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Tue, 11 Sep 2012 07:56:53 -0700
In order to understand MFJ products, you just need to know that many of them are rated in "MFJ Watts." An MFJ Watt is about half a regular watt. So a "1500 watt" MFJ tuner is good for about 750 norma
/archives//html/Amps/2012-09/msg00214.html (11,193 bytes)

60. [Amps] Chinese sockets (score: 1)
Author: Vic K2VCO <k2vco.vic@gmail.com>
Date: Thu, 13 Sep 2012 20:14:22 -0700
There are lots of Chinese 3-500Z (etc.) sockets available cheaply on EBay -- for example, item no. 251037245072. Are they any good? They are often cheaper than used Johnson sockets. The problem with
/archives//html/Amps/2012-09/msg00243.html (6,548 bytes)

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