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Total 314 documents matching your query.

61. Re: [Amps] 4CX10 000J / Racal MA1723 (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 4 Jul 2006 13:26:03 +0200
Hi Mark, I am also looking for a spectrum analyser ;-) No, I am not able to measure the spectrum of the MA1723 but is is really outstanding compared to my other radios. The factory specs only quote t
/archives//html/Amps/2006-07/msg00171.html (10,001 bytes)

62. [Amps] FW: Transformers (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 17 Jul 2006 01:53:19 +0200
Peak envelope power is the average power supplied to the antenna transmission line by a transmitter during one radio frequency cycle at the crest of the modulation envelope, under normal operating co
/archives//html/Amps/2006-07/msg00461.html (6,910 bytes)

63. Re: [Amps] FW: Transformers (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 17 Jul 2006 03:28:00 +0200
PEP power IS the peak power measured as the crest of the envelope during one cycle, so your 400Vs measures the highest power available which IS the peak power. It can only become less over more cycle
/archives//html/Amps/2006-07/msg00469.html (7,956 bytes)

64. Re: [Amps] FW: Transformers (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 17 Jul 2006 03:49:29 +0200
Yes, power can only be average power, but I used this wording to make clear that it is the power he measured with his scope reading of 400Vs 73 Peter Peter, You had it right the first time. PEP is th
/archives//html/Amps/2006-07/msg00472.html (9,315 bytes)

65. Re: [Amps] transformers (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 17 Jul 2006 16:41:46 +0200
Why? 1500W out are 1500W. You only deduct the drive power if you want to calculate gain or efficiency. 73 Peter Also, don't forget the feed thru from the driver needs to be deducted. / TT ___________
/archives//html/Amps/2006-07/msg00517.html (9,269 bytes)

66. Re: [Amps] transformers (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 18 Jul 2006 00:02:02 +0200
Very unlikely that measurements were correct, at 1812W input you never will get 1700W output. The plate current meter should kick to its stop then 73 Peter I had an L4B that put out 1700W PEP as meas
/archives//html/Amps/2006-07/msg00546.html (8,322 bytes)

67. Re: [Amps] Life and gain of 3-500Z (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Wed, 19 Jul 2006 00:12:14 +0200
When I recently repaired a TL-922 for a friend the original tubes where replaced by RFP 3-500ZG. There was no adjustment necessary to the input circuits, if I remember right the idling current in SSB
/archives//html/Amps/2006-07/msg00599.html (9,818 bytes)

68. Re: [Amps] RF Chokes (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Wed, 19 Jul 2006 15:30:09 +0200
Rohde&Schwarz did that from the fifties on in their SK050, SK080 and SK1 transmitters. Actually they were using two of them at right angles in their SK1, where one is shorted out on the higher freque
/archives//html/Amps/2006-07/msg00620.html (10,874 bytes)

69. Re: [Amps] Grid fuses (was: Life and gain of 3-500Z) (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Thu, 20 Jul 2006 17:08:56 +0200
Hi Mike, No wonder the resistors opened. At 100mA grid current there are already 0,27W heating them up. Most resistors are rated with their wattage at a 25&deg;C environment. Grid current usually is
/archives//html/Amps/2006-07/msg00674.html (10,361 bytes)

70. Re: [Amps] Life and gain of 3-500Z (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 21 Jul 2006 11:46:41 +0200
Rich, one of the tubes had a permanent shorted grid-cathode path and the heater transformer was burned out 73 Peter What was wrong with them, Peter? _______________________________________________ Am
/archives//html/Amps/2006-07/msg00718.html (9,581 bytes)

71. Re: [Amps] Grid fuses (was: Life and gain of 3-500Z) (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 21 Jul 2006 12:11:05 +0200
Rich, Yes, they are as low inductive as 1cm wide straps can be 73 Peter Are these wide straps non-inductive? _______________________________________________ Amps mailing list Amps@contesting.com http
/archives//html/Amps/2006-07/msg00721.html (7,857 bytes)

72. Re: [Amps] Grid fuses (was: Life and gain of 3-500Z) (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 21 Jul 2006 14:40:22 +0200
I would estimate them at 20nH at a length of 10cm, but they want be that long, not more then 3cm 73 Peter So they are both non-inductive as well as low-inductive? Remarkable. How much L would you est
/archives//html/Amps/2006-07/msg00749.html (10,735 bytes)

73. Re: [Amps] Grid fuses (was: Life and gain of 3-500Z) (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Fri, 21 Jul 2006 19:05:18 +0200
Valvo suggested in their transmitting tube tube manual to switch a 50K resistor from grid to ground by the anode overload relay to keep a ground path for the arc to discharge 73 Peter The way I see i
/archives//html/Amps/2006-07/msg00779.html (10,436 bytes)

74. Re: [Amps] grid fuses (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 22 Jul 2006 02:16:35 +0200
Why should I do that effort if I can find straps ready to install or cut them from sheet metal? 73 Peter "Yes, they are as low inductive as 1cm wide straps can be" How about say, five or six number 2
/archives//html/Amps/2006-07/msg00817.html (8,664 bytes)

75. Re: [Amps] Grid fuses (was: Life and gain of 3-500Z) (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 22 Jul 2006 02:58:57 +0200
Only if you omit overload control circuits 73 Peter IME, heavy grid straps, even with a 25 ohm HV glitch resistor, a plate-grid 'event', is bad news for the 3-500 tube grid. _________________________
/archives//html/Amps/2006-07/msg00823.html (9,625 bytes)

76. Re: [Amps] grid fuses (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Sat, 22 Jul 2006 03:22:55 +0200
Not really, its quit common that tubes like YL1050, TH347 etc. which are very high gain metal ceramic tetrodes for linear mode of small tv-transmitters and linear service arc internally from time to
/archives//html/Amps/2006-07/msg00824.html (8,734 bytes)

77. Re: [Amps] The maximum amount of 811As and 572Bs in parallel (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Mon, 24 Jul 2006 19:55:28 +0200
Sweep tube amps were quite common in Germany in the past when our power was limited to 150W total dissipation in the final stage. I built several myself, one GG with 5xPL519 doing 2KW out on all band
/archives//html/Amps/2006-07/msg01024.html (9,583 bytes)

78. Re: [Amps] Fw: "Tubes 201" - How Vacuum Tubes Really Work (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 25 Jul 2006 20:04:34 +0200
Nothing is easier then that if the cathode is going/driven negative with respect to ground. Grid voltage is always measured from grid to cathode, not to ground. 73 Peter please explain how a grid bec
/archives//html/Amps/2006-07/msg01098.html (9,926 bytes)

79. Re: [Amps] setting the grid adrift (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 25 Jul 2006 20:20:10 +0200
There is neither high cost nor a sophisticated circuit necessary to protect tubes. The cost is always a fraction of the tubes value It is the only way. When the grid is under arc it is at anode poten
/archives//html/Amps/2006-07/msg01102.html (10,353 bytes)

80. Re: [Amps] Fw: "Tubes 201" - How Vacuum Tubes Really Work (score: 1)
Author: "Peter Voelpel" <df3kv@t-online.de>
Date: Tue, 25 Jul 2006 20:40:38 +0200
Hi Will, when the grid is kept grounded it can not become more positive then the cathode if that is grounded and not negative biased as well, except by RF drive on it above its choke. 73 Peter Peter,
/archives//html/Amps/2006-07/msg01105.html (11,144 bytes)

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