Search String: Display: Description: Sort:

Results:

References: [ +from:alexeban@gmail.com: 257 ]

Total 257 documents matching your query.

41. Re: [Amps] Drake L-4 PS Transformer Rating (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 4 Feb 2009 16:30:36 +0200
...I concur. If you don't upgrade it by 7 to 10 dB, it's easier to improve the antenna, less expensive and less complicated. Of course, unless you consider it as an exercise in craftsmanship..... Ale
/archives//html/Amps/2009-02/msg00065.html (8,557 bytes)

42. Re: [Amps] pole transformer (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 4 Feb 2009 16:30:36 +0200
Hi guys: I think you got to overstretching the subject! Did any one of you get a good draught of gas lately? If not, why PCB? Drop it, guys. No chemical is totally safe! Treat it with due respect and
/archives//html/Amps/2009-02/msg00066.html (14,369 bytes)

43. Re: [Amps] pole transformer (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 4 Feb 2009 16:42:20 +0200
...I sure hope you don't plan a PCB based diet!!!!! Alex 4Z5KS Good link Pete. Although it appears to be written by a committee of academics and then scoured by a room full of lawyers I was able to g
/archives//html/Amps/2009-02/msg00067.html (18,267 bytes)

44. Re: [Amps] Plate Choke Values (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 5 Feb 2009 15:29:24 +0200
Merry meet you all: Based on the past experience we had when working on high power transmitters at Elisra : The impedance of the choke should be about 5 to 10 times the design load impedance of the s
/archives//html/Amps/2009-02/msg00107.html (9,592 bytes)

45. Re: [Amps] Plate Choke Values (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Thu, 5 Feb 2009 20:10:09 +0200
I would very much like to recommend a grounded grid arrangement. I am using one myself for quite a while now. I inherited it from the late 4X1AT, a very nice ham. We were very sorry when he passed aw
/archives//html/Amps/2009-02/msg00119.html (14,208 bytes)

46. Re: [Amps] Plate Choke Values (score: 1)
Author: "alexeban" <alexeban@gmail.com>
Date: Thu, 5 Feb 2009 20:29:22 +0200
What I can say for sure is that the amplifier I have puts out about 950 Watts at 2500 VDC on the plate and uses air capacitors. I never had arcing or burnouts! The idea put forth by Peter is wonderfu
/archives//html/Amps/2009-02/msg00120.html (9,654 bytes)

47. Re: [Amps] High voltage/wattage zeners (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 8 Feb 2009 21:30:51 +0200
.....connect a Zener from the collector to the base of a 2N3055 transistor, heat sink it, and you have a 150W Zener diode! Alex 4Z5KS Hi all, Can anyone steer me to a supplier of zener diodes in the
/archives//html/Amps/2009-02/msg00206.html (8,474 bytes)

48. Re: [Amps] Autotuners in Amps (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Thu, 12 Feb 2009 08:58:31 +0200
...seems like too much of a good thing to me! If you consider that most of the amplifiers in use are of the grounded grid variety, with the attendant low input impedance, the Q of the tune network at
/archives//html/Amps/2009-02/msg00354.html (10,284 bytes)

49. Re: [Amps] best atu (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Tue, 17 Feb 2009 00:38:12 +0200
..there's another reason I discovered. Most antennas are weather sensitive: loaded with ice or snow they go haywire (pun intended). I blew out the finals on my TS140 in such a situation: I found out
/archives//html/Amps/2009-02/msg00522.html (9,277 bytes)

50. Re: [Amps] Kilovac HC-4 Relays (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Wed, 18 Feb 2009 11:07:23 +0200
There's no reason why not! Especially when considering that you are NOT going to hot switch a kW level amplifier in any case! Remember when we were using Potter & Broomfield open frame relays for it?
/archives//html/Amps/2009-02/msg00542.html (8,094 bytes)

51. Re: [Amps] testing RF power MOSFET devices (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Mon, 23 Feb 2009 10:29:35 +0200
1 and 2 are correlated: the 2Megs. Reading indicates that there is a leakage path from gate to ground. The charge impressed on the gate leaks through it and causes a gradual turn off of the transisto
/archives//html/Amps/2009-02/msg00656.html (8,842 bytes)

52. Re: [Amps] Minimum Value of RF Plate Chokes (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 27 Feb 2009 07:22:04 +0200
Eddy is correct!! It is true that you can "tune out" part of the stage's output reactive component and this is done in transistor output stages. But then, the required load resistance is quite low, s
/archives//html/Amps/2009-02/msg00692.html (11,281 bytes)

53. Re: [Amps] Minimum Value of RF Plate Chokes (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 27 Feb 2009 07:31:07 +0200
...guys, remember that adding capacitance on the input side does modify the loaded Q, besides reducing the tuning range of the network! This technique of "neutralizing" part of the output reactance o
/archives//html/Amps/2009-02/msg00693.html (13,415 bytes)

54. Re: [Amps] Minimum Value of RF Plate Chokes (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Fri, 27 Feb 2009 07:44:56 +0200
...don't do that! You'll never know what combination will hit resonance in what band without a network analyzer, especially in a multiband amplifier until it's too late! The idea of moving the output
/archives//html/Amps/2009-02/msg00694.html (9,884 bytes)

55. Re: [Amps] "Big Iron" transformer source in UK? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 1 Mar 2009 10:40:44 +0200
Pardon my ignorance, but I was under the impression that we, as hams, are entitled to a maximum of 1500W input power; maybe 2000W or so in the States. What is all the talk on the monster transformers
/archives//html/Amps/2009-03/msg00001.html (10,337 bytes)

56. Re: [Amps] "Big Iron" transformer source in UK? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 1 Mar 2009 10:42:54 +0200
Pardon my ignorance, but I was under the impression that we, as hams, are entitled to a maximum of 1500W input power; maybe 2000W or so in the States. What is all the talk on the monster transformers
/archives//html/Amps/2009-03/msg00002.html (9,855 bytes)

57. Re: [Amps] "Big Iron" transformer source in UK? (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Sun, 1 Mar 2009 16:10:52 +0200
...now I begin to appreciate the price. Just buying that much iron in silicone steel would justify the price!! Alex 4Z5KS Ian at Harrison & Greenwood are good to deal with. Ian is very helpful, but d
/archives//html/Amps/2009-03/msg00010.html (9,505 bytes)

58. Re: [Amps] SWR & other things... (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Tue, 3 Mar 2009 09:10:08 +0200
..Unfortunately, components that are able to handle power are scarce and expensive. High power means massive parts, widely spaced construction to prevent arcing and thorough shielding between the pow
/archives//html/Amps/2009-03/msg00083.html (9,497 bytes)

59. Re: [Amps] caps across rectifier diodes (score: 1)
Author: "Alex Eban" <alexeban@gmail.com>
Date: Tue, 3 Mar 2009 11:00:44 +0200
...capacitors are still needed. They were put there to reduce rectifier hash- noise generated in the diodes by the reverse leakage current- ant that is still there, even though reduced in modern diod
/archives//html/Amps/2009-03/msg00097.html (13,058 bytes)

60. Re: [Amps] Panel Meter Article, QST (score: 1)
Author: "Alex" <alexeban@gmail.com>
Date: Thu, 5 Mar 2009 19:25:10 +0200
If you have a variable power supply, connect the meter to it through a 1kiloohm resistor and start rising the voltage till you get a full scale reading. Measure the voltage drop on the resistor, your
/archives//html/Amps/2009-03/msg00145.html (8,530 bytes)

Current List: 41 - 60
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]
This search system is powered by Namazu