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101. Re: [Amps] fan experts (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 29 Jan 2006 13:31:28 +0100; _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-01/msg00673.html (8,813 bytes)
102. Re: [Amps] fan experts (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 29 Jan 2006 13:32:49 +0100; EBM http://www.ebmpapst.us/ and Klein blowers fit in to the description. 73/ Karl-Arne SM0AOM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contes; /archives//html/Amps/2006-01/msg00674.html (8,952 bytes)
103. Re: [Amps] fan experts (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 29 Jan 2006 14:34:58 +0100; Try this: ebm-papst Rus GmbH Nizhegorodskaya 32, str. 15 office 420 RU-109029 Moskau Telefon: ++7-495-671 53 93 Telefon: ++7-495-671 53 95 info@ebmpapst.ru http://www.ebmpapst.ru 73/ Karl-Arne SM0AOM; /archives//html/Amps/2006-01/msg00679.html (10,016 bytes)
104. Re: [Amps] Tek 7000 series scope with 7L12 spectrum analyzer question. (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 5 Feb 2006 20:30:31 +0100; Since the signal frequency is converted into a low-frequency Y deflection signal for amplitude, and the X deflection is the frequency sweep any 7000-series, preferably storage, mainframe modern enoug; /archives//html/Amps/2006-02/msg00113.html (9,324 bytes)
105. Re: [Amps] boonton 59 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 19 Feb 2006 19:28:48 +0100; The "device" you are describing is the plug connection of the oscillator head to the power supply and indicator. Inside the oscillator head (round object marked "Megacycle meter") you will find the a; /archives//html/Amps/2006-02/msg00350.html (8,827 bytes)
106. Re: [Amps] testing 572 B tubes (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 4 Mar 2006 12:16:10 +0100; 73/ Karl-Arne SM0AOM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-03/msg00059.html (9,550 bytes)
107. Re: [Amps] A request from Portugal (Was: RE: testing 572 B tubes) (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 4 Mar 2006 21:03:14 +0100; The principle used in the K4IPV power tube tester is very simple. Testing the tube involved providing it with proper DC potentials, and inserting a small and known AC voltage in series with the contr; /archives//html/Amps/2006-03/msg00073.html (10,528 bytes)
108. Re: [Amps] Tuned input board on SB-220 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 25 Mar 2006 11:51:42 +0100; Actually the value of 20 pF/meter (-j27) is also quoted at several places in my 1970 edition along with 13 pF/meter. Presumably these values result in "reasonable" cathode circuit Q's (2 - 3) with th; /archives//html/Amps/2006-03/msg00657.html (9,586 bytes)
109. Re: [Amps] tank coil heating (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Thu, 11 May 2006 18:54:04 +0200; If you don't disconnect the parallel fixed padder across the C2 in the Pi-network on 14 MHz, you may end up in serious heating trouble, as well as using a very unsuitable operating point for the PA t; /archives//html/Amps/2006-05/msg00078.html (10,626 bytes)
110. Re: [Amps] Telefunken vs2525/1 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 13 May 2006 15:53:08 +0200; You can buy copies of the complete SV 2525/1 documentation from http://www.algra-funkarchiv.de. Price about 60 EUR for a set. 73/ Karl-Arne SM0AOM _______________________________________________ Amps; /archives//html/Amps/2006-05/msg00093.html (7,890 bytes)
111. Re: [Amps] Telefunken vs2525/1 (score: 1): Author: <sm0aom@telia.com>; Date: Mon, 15 May 2006 11:23:43 +0200 (MEST); I have seen this amplifier briefly in the 70's, and it is related to the Telefunken family of servo-tune amplifiers that was used quite widely in military and point-to-point services in the 60's and; /archives//html/Amps/2006-05/msg00099.html (8,285 bytes)
112. Re: [Amps] VTVM Diodes (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 16 May 2006 20:01:20 +0200; The internal circuitry of the HP410C and the USM-116 AC probe looks practically identical. Also, the filament current of both the EA52 and the EA53 is the same, 300 mA. It would most probably not be; /archives//html/Amps/2006-05/msg00120.html (12,888 bytes)
113. Re: [Amps] doorknob ratings (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Thu, 25 May 2006 16:23:38 +0200; These capacitors are perfectly OK for bypass and coupling purposes, as the capacitors will not be kVAr rating stressed in these applications. They should however not form part of tuned circuits, as t; /archives//html/Amps/2006-05/msg00352.html (8,402 bytes)
114. Re: [Amps] Historical question-probably OT (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Fri, 26 May 2006 21:44:37 +0200; I have to admit that I have run a pair of 4CX250B's in AB2 on 144 MHz during my SK6AB days... (late 70's) Hopefully the limitation time for these "crimes" has long passed. The DK1OF PA design for 144; /archives//html/Amps/2006-05/msg00395.html (9,674 bytes)
115. Re: [Amps] Looking for shematic to set MRF448 into Class AB (score: 1): Author: <sm0aom@telia.com>; Date: Wed, 31 May 2006 10:50:55 +0200 (MEST); The transistors may also be related to the MRF428 or the SRF3513 which were the original transistors in the Motorola 300W gain-block that was used almost unchanged in the HF-80. There are lots of des; /archives//html/Amps/2006-05/msg00540.html (9,589 bytes)
116. Re: [Amps] 4CX10 000J (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 2 Jul 2006 19:08:22 +0200; There are a few of the early Collins 208U-10's in the hands of radio amateurs... 10 - 12 kW PEP or CW, with IM3 at least 36 dB down from one tone, assumíng a very good exciter and correctly ad; /archives//html/Amps/2006-07/msg00059.html (10,908 bytes)
117. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1): Author: <sm0aom@telia.com>; Date: Mon, 3 Jul 2006 10:49:47 +0200 (MEST); Most interesting discussion. Peter wrote: "On the other hand, if in a 10kHz wide band starting 6.75 kHz away, you aren't down 50dB, then you're somewhat antisocial anyway." It appears, from i.a. SM5B; /archives//html/Amps/2006-07/msg00078.html (14,227 bytes)
118. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1): Author: <sm0aom@telia.com>; Date: Mon, 3 Jul 2006 10:50:37 +0200 (MEST); Most interesting discussion. Peter wrote: "On the other hand, if in a 10kHz wide band starting 6.75 kHz away, you aren't down 50dB, then you're somewhat antisocial anyway." It appears, from i.a. SM5B; /archives//html/Amps/2006-07/msg00079.html (13,856 bytes)
119. Re: [Amps] 4CX10 000J / Racal MA1723 (score: 1): Author: <sm0aom@telia.com>; Date: Mon, 3 Jul 2006 11:10:57 +0200 (MEST); As the synthesiser in the MA1723 is very similar to the one used in the RA1792, I would estimate the total sideband noise to be about - 90 dBc/Hz at 5 kHz spacing. However, it is likely that noise fr; /archives//html/Amps/2006-07/msg00080.html (11,769 bytes)
120. Re: [Amps] 3cx3000A7 driver (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 23 Jul 2006 11:34:15 +0200; Peter, You are certainly right... Making a medium to high power HF transmitter with "close-in" noise sidebands of -160 dBc/Hz would be a very difficult task indeed. It is not only the spectral purity; /archives//html/Amps/2006-07/msg00919.html (11,850 bytes)

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