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1. Re: [Amps] SRS 360? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 1 Nov 2009 09:47:10 +0100; The SRS360 was the DDR manufactured equivalent of the TB3/750 or 5867A. It is a 350 W dissipation medium-mu triode which needs a bias circuit to work properly. An RF amplifier circuit using the TB3/7; /archives//html/Amps/2009-11/msg00000.html (8,676 bytes)
2. Re: [Amps] STP5NB100 - MOSFET from where? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 15 Sep 2009 11:00:14 +0200 (CEST); Any 800 - 1000 V 5A N-channel high-voltage MOSFET should work, such as the IRFPF40 or IRFPF50 from International Rectifier. 73/ Karl-Arne SM0AOM Hi to the group. Anyone know where I can get a STP5NB1; /archives//html/Amps/2009-09/msg00191.html (8,100 bytes)
3. Re: [Amps] Simpson 260 question (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 3 Aug 2009 21:46:08 +0200; I would strongly advise against measuring non-current limited amplifier plate voltages in the kV region with the standard Simpson 260. The internal and external flash-over distances are not sufficien; /archives//html/Amps/2009-08/msg00062.html (9,966 bytes)
4. Re: [Amps] plate dissipation and duty factor (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Thu, 12 Mar 2009 18:57:44 +0100; The assumption that duty cycle * peak dissipation = average dissipation holds so long as the pulse lengths or envelope variations are short compared to the thermal time constant of the anode structur; /archives//html/Amps/2009-03/msg00350.html (17,278 bytes)
5. Re: [Amps] Roller Inductor specs (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 16 Feb 2009 09:09:50 +0100 (CET); On a "sunny day" the BC-375 put out about 60 - 100 W CW or AM carrier. The roller inductor was part of a matching network that series-tuned the aircraft wire antennas at the lower HF frequencies. Rat; /archives//html/Amps/2009-02/msg00490.html (10,186 bytes)
6. Re: [Amps] Roller Inductor specs (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 15 Feb 2009 20:22:13 +0100; This is the roller inductor from the BC-375 airborne transmitter. If memory serves me right it is about 18 uH inductance with an approx. 5 ampere RF current rating. 73/ Karl-Arne SM0AOM -- No virus f; /archives//html/Amps/2009-02/msg00481.html (8,364 bytes)
7. Re: [Amps] measurement of Screen grid current (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 4 Jan 2009 15:47:40 +0100; There is a slight problem called "LED threshold voltage" in this concept. Most LED:s want a voltage of at least 1 V to produce any light, so it would take at least one ampere of screen current to get; /archives//html/Amps/2009-01/msg00027.html (9,244 bytes)
8. Re: [Amps] switchable zener cathode bias (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 31 Dec 2008 10:33:13 +0100; The easiest way would be to use a single-pole relay or switch contact to parallel the lower-voltage Zener with the higher-voltage one. When in circuit, the lower-voltage Zener will go into conduction; /archives//html/Amps/2008-12/msg00385.html (9,596 bytes)
9. [Amps] Ang: Re: Inductor Software? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Fri, 5 Dec 2008 14:11:10 +0100 (CET); The answer may be closer than you expect. Visit http://www.zerobeat.net/G4FGQ/page3.html and download SOLNOID3. exe This program calculates the inductance of cylindrical air-core coils with reasonabl; /archives//html/Amps/2008-12/msg00103.html (8,289 bytes)
10. Re: [Amps] Damage? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Fri, 25 Jul 2008 22:05:08 +0200; It is very unlikely that modern cars, which are built to very strict EMC specifications, could be interfered with or damaged by amateur power levels, even if parked in the near field of quite large a; /archives//html/Amps/2008-07/msg00267.html (10,881 bytes)
11. Re: [Amps] W3NQN band pass filters (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 11 Jun 2008 17:43:30 +0200; First, I would suggest that you check that the indicated return loss is > 30 dB when the MFJ-269 is terminated with a known good 50 ohm termination. It is difficult to optimise return loss performanc; /archives//html/Amps/2008-06/msg00092.html (10,036 bytes)
12. Re: [Amps] How to test a balun? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 26 May 2008 18:44:30 +0200; The "classical" way to check balun performance, at least on lower frequencies, is to connect a balanced resistive load with the correct impedance and the center tap "grounded". Using an RF voltmeter; /archives//html/Amps/2008-05/msg00193.html (9,876 bytes)
13. Re: [Amps] Anyone know RF properties of Acrylic?? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Fri, 23 May 2008 09:12:28 +0200 (CEST); "Reference data for Radio Engineers" lists the dissipation factor for polymethylmethacrylate (the acrylic monomer used in i.a. Plexiglas) as 0.0140 at 1 MHz and 0.0057 at 3 GHz This is about two orde; /archives//html/Amps/2008-05/msg00168.html (8,298 bytes)
14. Re: [Amps] 3 1/8 to 7/16 ? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 16 Apr 2008 19:05:38 +0200; Years ago, I came across exactly this type of adapter at work. It was manufactured by Spinner GmbH in Germany. Unfortunately, I cannot remember the item number, and the current Spinner on-line catalo; /archives//html/Amps/2008-04/msg00213.html (9,062 bytes)
15. Re: [Amps] 4CX250 MSDS SHEET (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 12 Dec 2007 13:34:52 +0100 (CET); Years ago, I contacted CPI/Eimac about the possible use of BeO in ordinary power tubes, and got the answer that the external anode/air cooled types did not use BeO in their construction. The only cur; /archives//html/Amps/2007-12/msg00141.html (13,978 bytes)
16. Re: [Amps] Blocking capacity identity? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 4 Nov 2007 18:47:19 +0100; My junkbox also contains such a capacitor. It comes out of the 5 kW Granger Associates 172-2 MF/HF transmitters which were assembled by KW, and was used as the plate blocking capacitor between an Eim; /archives//html/Amps/2007-11/msg00055.html (9,418 bytes)
17. Re: [Amps] 8877 Grid Trip timing (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 2 Oct 2007 20:04:16 +0200; Actually the "crowbars" in large transmitters are there to save the "tube innards" (grids, cathode) in case of internal arcs which are common occurrence. The sense circuit is connected in the plate r; /archives//html/Amps/2007-10/msg00021.html (9,851 bytes)
18. Re: [Amps] 4CX250 IMD (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 1 Oct 2007 17:29:41 +0200; The 1961 RCA data sheet for the 4CX250B can be found at: http://frank.pocnet.net/sheets/079/7/7203.pdf 73/ Karl-Arne SM0AOM -- Original Message -- From: "Steve Thompson" <g8gsq@eltac.co.uk> To: <amps; /archives//html/Amps/2007-10/msg00011.html (8,783 bytes)
19. Re: [Amps] Off topic question (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 30 Sep 2007 11:56:15 +0200; The Heathkit HW 12/22/32 single-banders used parallel 6GE5 in their final stages. Also the novice transceivers HW-16 and the 160m transceiver HW-18 used these valve. 73/ Karl-Arne SM0AOM ____________; /archives//html/Amps/2007-09/msg00505.html (7,798 bytes)
20. Re: [Amps] 1625SS (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 7 Aug 2007 19:54:47 +0200; There is a brief story of the ARC-5/SCR-274 command set evolution, with emphasis on the VHF units, in the document http://www.scr-274-n.info/css.pdf from CQ November 1964. Nothing specific was howeve; /archives//html/Amps/2007-08/msg00022.html (11,492 bytes)

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