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21. Re: [BULK] - [Amps] Advice on instruments for ham use (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 23 Nov 2004 20:31:59 +0100; Just remembered a very good resource on the net: http://www.nethippy.org/tubes/scoperef.html A (somewhat wordy) primer on oscilloscope techniques compiled on the R-390 reflector 73/ K-A _____________; /archives//html/Amps/2004-11/msg00397.html (8,021 bytes)
22. Re: [Amps] HT 57 blocking cap ratings? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 4 Dec 2004 11:54:48 +0100; No. The RF current ratings of capacitors are derived in two ways, one is from the heating from dielectric and resistive losses in the capacitor, and the other is derived from the allowable peak volta; /archives//html/Amps/2004-12/msg00065.html (9,159 bytes)
23. Re: [Amps] 8122 x 12 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 29 Dec 2004 09:43:21 +0100; About 30 years ago, you could buy such an amplifier from Marconi, the H-1000. It used 12 4CX250B's in a distributed wide-band amplifier configuration and provided 1 kW CW or PEP with 100 mW drive bet; /archives//html/Amps/2004-12/msg00376.html (12,043 bytes)
24. Re: [Amps] 8122 x 12 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 29 Dec 2004 09:45:56 +0100; The AEG-Telefunken 100 kW linears with their 8 x 4CX250B pre-driver (!) stage come to my mind... 73/ Karl-Arne SM0AOM _______________________________________________ Amps mailing list Amps@contesting; /archives//html/Amps/2004-12/msg00377.html (9,675 bytes)
25. Re: [Amps] 8122 x 12 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 29 Dec 2004 11:33:38 +0100; When I think about it, the H-1000 was probably only rated to 25 MHz.... Actually their uses as I witnessed them were most for NVIS and as a component in very early frequency-hoppers. 73/ Karl-Arne SM; /archives//html/Amps/2004-12/msg00380.html (9,640 bytes)
26. Re: [Amps] Ferrite-loaded plate choke (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 9 Jan 2005 19:45:42 +0100; My understanding of this circuit is that it connects the HV at the output end of the Pi-network, which gives a much lower impedance level for the choke. The drawback is that the Pi-network capacitors; /archives//html/Amps/2005-01/msg00153.html (10,446 bytes)
27. Re: [Amps] Ferrite-loaded plate choke (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 9 Jan 2005 20:04:48 +0100; Well, I have to modify my previous posting somewhat. This is a most clever way of feeding the HV to the plates, by using the inductance of the Pi-network coil as both a network component and as the p; /archives//html/Amps/2005-01/msg00154.html (10,922 bytes)
28. Re: [Amps] Capacitor (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 29 Jan 2005 15:34:55 +0100; The description fit in on TCC ceramic high-voltage capacitors of early 50's vintage. Similar capacitors were used in the Standard Radio CT5 5 kW CW/FSK transmitters (CV445 or 5J/180E forced air coole; /archives//html/Amps/2005-01/msg00568.html (9,459 bytes)
29. Re: [Amps] KAPSCH Capacitor (score: 1): Author: Karl-Arne Markstrm <sm0aom@telia.com>; Date: Sat, 5 Feb 2005 09:42:17 +0100; These capacitors are made in Austria, by Kapsch AG which has a web-page www.kapsch.at It may be possible to get some information from them, as they still make electronic components. Its size points i; /archives//html/Amps/2005-02/msg00136.html (8,266 bytes)
30. [Amps] HF-80 schematics (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Fri, 4 Mar 2005 17:56:11 +0100; Hello, Does anyone here have scanned schematics for the Digital Control Card A9 (Collins part no 641-3592-001) and Exciter Interface A11 (Collins part no 635-0745-001)? These are part of the Collins; /archives//html/Amps/2005-03/msg00054.html (6,758 bytes)
31. Re: [Amps] Water cooled amp question (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 5 Mar 2005 15:49:11 +0100; As far as I know ethylene glycol as automotive anti-freeze dates from the mid-20's when the "Prestolite" anti-freeze mixture was first marketed. It is believed that the high-enthalpy and high-boiling; /archives//html/Amps/2005-03/msg00092.html (12,367 bytes)
32. Re: [Amps] nylons (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 15 Mar 2005 22:31:27 +0100; Nylon should probably be avoided entirely in strong RF fields. The dielectric material property list in ITT Reference Data for Radio Engineers lists the dissipation factor of nylon as about 0.022 at; /archives//html/Amps/2005-03/msg00346.html (11,441 bytes)
33. Re: [Amps] nylons (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 16 Mar 2005 08:09:44 +0100; It is most unlikely that any differences will be noted between nylon (or other "lossy" plastics) or high-grade dielectrics in these applications, as the E-field intensities around the components will; /archives//html/Amps/2005-03/msg00361.html (16,813 bytes)
34. Re: [Amps] Bird Element Calibration? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Mon, 21 Mar 2005 18:20:40 +0100; I would certainly second Peter's findings. In a previous occupation. I had some involvement with acceptance testing of UHF solid-state power amplifiers for military ground/air uses. The amplifier spe; /archives//html/Amps/2005-03/msg00457.html (12,161 bytes)
35. Re: [Amps] Bird 'H' series inserts: Performance on 160 (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Tue, 29 Mar 2005 21:10:24 +0200; Made a similar test with the following Bird elements and a test setup consisting of: RF source adjustable to 50 and 100W output monitored on a freshly calibrated HP410C RF voltmeter with the T- junct; /archives//html/Amps/2005-03/msg00695.html (12,793 bytes)
36. Re: [Amps] MLA-2500B Question (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 30 Mar 2005 08:08:50 +0200; Gentlemen: In this discussion, there are a few things to consider. The varying input impedance in a grounded-grid PA over the drive cycle manifests itself as distorsion of the driving current wavefor; /archives//html/Amps/2005-03/msg00715.html (19,105 bytes)
37. Re: [Amps] [BULK] - Re: 4CX350 distortion products? (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Wed, 30 Mar 2005 19:15:27 +0200; In the Philips/Mullard data book the IM3 products at 30 MHz are quoted as -29 dB down from one tone and IM5 -30 dB down. The operating point quoted was 2200 V plate voltage, 300V screen voltage, 100; /archives//html/Amps/2005-03/msg00725.html (9,615 bytes)
38. Re: [Amps] MLA-2500B Question (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Thu, 31 Mar 2005 08:47:14 +0200; An automatic tuner feeding a cathode driven amplifier using a shunt capacitor across the input terminals will work. But the capacitive susceptance shunting the input will have to be considerably less; /archives//html/Amps/2005-03/msg00737.html (14,926 bytes)
39. Re: [Amps] Wanted Tektronix 475 Manuals & Probes (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sat, 2 Apr 2005 21:04:40 +0200; The probe you have is with all probability the Tektronix P6013A. Be aware that safe use of this probe at full ratings require the filling of a freon-based dielectric fluid that may be difficult to fi; /archives//html/Amps/2005-04/msg00044.html (10,536 bytes)
40. Re: [Amps] Johnson 229-0202 roller (score: 1): Author: Karl-Arne Markström <sm0aom@telia.com>; Date: Sun, 3 Apr 2005 20:37:05 +0200; They are rated for 5 A RF, so they operate in the vicinity of their maximum ratings at the 1500 W level, somewhat depending on loaded Q in the network. Usually the duty cycle is low enough that heati; /archives//html/Amps/2005-04/msg00059.html (9,508 bytes)

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