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81. Re: [Amps] sealed air cooled dummy load in oil?? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 05 Apr 2006 07:53:35 +0100; I was going to suggest blowing air rather than dunking it in oil - but to know if either is worthwhile you need to look at the thermal resistances from the resistor part to ambient. I don't know the; /archives//html/Amps/2006-04/msg00074.html (8,525 bytes)
82. Re: [Amps] Plate impedance (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 10 Apr 2006 15:29:31 +0100; Zero signal anode current. Interesting observation - on that side of the Atlantic shouldn't it be ZSPC? Steve _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2006-04/msg00138.html (7,260 bytes)
83. Re: [Amps] RCA load impedance calculation (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 11 Apr 2006 09:02:09 +0100; I was about to make the same comment - except Vs is the supply voltage, not the peak-peak swing. Where the anode/collector/drain doesn't go down to 0V, use (Vs-Vmin) in place of Vs. It's a first appr; /archives//html/Amps/2006-04/msg00167.html (7,588 bytes)
84. Re: [Amps] NON-CONTACT laser thermometer (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 11 Apr 2006 14:14:42 +0100; Something to allow for with these - 8:1 distance to spot size. At 1' measuring distance, you're looking at a 1.5" dia. spot. If you're trying to guage a component that's smaller than this and the sur; /archives//html/Amps/2006-04/msg00172.html (6,937 bytes)
85. Re: [Amps] NON-CONTACT laser thermometer (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 11 Apr 2006 15:17:32 +0100; Painting on some white typo correcting fluid gives (close enough) the right emissivity and won't affect the temperature in most cases - but it's a mess if the spot size is too big. Steve ____________; /archives//html/Amps/2006-04/msg00182.html (7,608 bytes)
86. Re: [Amps] NON-CONTACT laser thermometer (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 11 Apr 2006 22:57:46 +0100; At least 15 years ago my works had a Minolta unit, looked like a small cine camera. I don't remember the exact spec., but I think the dispertion was about 1:100 - at 4" spot size was about 1mm and yo; /archives//html/Amps/2006-04/msg00187.html (8,527 bytes)
87. Re: [Amps] Cal Lab (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 23 Apr 2006 22:16:52 +0100; To check/set oscillators here, I use the OCXO as external input to lock a synth sig gen, then set the output frequency to put it on top of a BBC station and time the beat note, I've used both MW and; /archives//html/Amps/2006-04/msg00336.html (7,734 bytes)
88. Re: [Amps] Amps at Visalia (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 26 Apr 2006 07:33:38 +0100; My guess is that the all singing/dancing solid state amps also appeal to the professional/semi mil markets in a way that tube amps won't. That would hold the price up rather than getting it pushed do; /archives//html/Amps/2006-04/msg00382.html (7,839 bytes)
89. Re: [Amps] HF RF amplifier negative feedback (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 27 Apr 2006 19:49:24 +0100; Make sure you know what's going on outside the intended operating frequency range. As I recall, it's a technique discussed in 'SSB principles and circuts'. Steve _____________________________________; /archives//html/Amps/2006-04/msg00409.html (7,421 bytes)
90. Re: [Amps] VHF Parasitics re-revisited (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 04 May 2006 08:00:03 +0100; Part of the problem has been carbon comp resistors which were (still are?) widely used. They are unsuited to the application and there have been better alternatives for at least 30 years. Being pedan; /archives//html/Amps/2006-05/msg00015.html (11,550 bytes)
91. [Amps] Amps and ROHS (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 21 May 2006 07:46:13 +0100; I've not tried the current designs, but I have used and fixed older models. I came across several with fried mains transformers, and I thought the shielding/screening was poor on vhf models. Changing; /archives//html/Amps/2006-05/msg00259.html (8,671 bytes)
92. Re: [Amps] Amps and ROHS (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 21 May 2006 12:08:44 +0100; As I understand it - if something has been previously sold (technically 'put on the market') within the EU before July, it's ok to resell it. If the individual item is new to the EU market, it has to; /archives//html/Amps/2006-05/msg00263.html (8,809 bytes)
93. Re: [Amps] Amps and ROHS (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 21 May 2006 12:15:18 +0100; Isn't the regulation is specific about being 'placed on the market' **within the EU**? My advice is that anything placed on the market outside the EU doesn't have exemption regardless of age. It appl; /archives//html/Amps/2006-05/msg00264.html (9,014 bytes)
94. Re: [Amps] RE : who needs it? Henry 8K (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 24 May 2006 15:50:06 +0100; In twenty odd years of vhf contesting, the crowd I was with tried numerous sites, antenna systems, rigs and so forth. The only thing where we found that there was a consistent relationship with impr; /archives//html/Amps/2006-05/msg00323.html (7,554 bytes)
95. Re: [Amps] RE : who needs it? Henry 8K (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 24 May 2006 16:32:03 +0100; Correction - that's actually a misquote of Hans Solo. Sorry. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/; /archives//html/Amps/2006-05/msg00324.html (7,462 bytes)
96. Re: [Amps] RE : who needs it? Henry 8K (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 24 May 2006 17:21:54 +0100; Google is your friend :-) Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-05/msg00329.html (7,688 bytes)
97. Re: [Amps] Quad Tube 4cx800 hf amp (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 26 May 2006 07:20:06 +0100; I've checked a number of ceramic valves when in situ in a chassis, and the C from anode to ground is usually around twice the data sheet value. For a 4CX800, a couple of inches away from the sidewall; /archives//html/Amps/2006-05/msg00370.html (8,449 bytes)
98. Re: [Amps] multi-tube amplifiers (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 26 May 2006 22:10:29 +0100; To get most of the combined power out in the right direction, the amplitude and phase of the two inputs to the combiner have to be reasonably well matched. Solid state amps tend to manage this by def; /archives//html/Amps/2006-05/msg00402.html (8,848 bytes)
99. Re: [Amps] 813's (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 27 May 2006 18:46:39 +0100; RCA data says not. Vertical only, either way up. 73, Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-05/msg00421.html (6,231 bytes)
100. Re: [Amps] 813's (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 27 May 2006 18:49:11 +0100; Additional to previous - this data attributed to RCA says yes, if you get the orientation right. I'm sure that the data I have says not. http://www.nj7p.org/Tube1.php?tube=813 Steve _________________; /archives//html/Amps/2006-05/msg00422.html (7,218 bytes)

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