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61. Re: [Amps] Tuned Input (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 20 Jan 2006 17:06:43 +0100 (CET); Has anyone ever come up with an equation for the input impedance of a GG stage in Class AB2? I guess the problem is that it's a variable with drive level - at very low level, where the stage is Class; /archives//html/Amps/2006-01/msg00485.html (8,111 bytes)
62. Re: [Amps] Tuned Input (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 23 Jan 2006 10:54:02 +0100 (CET); 73 Peter SM/G3RZP This week - W6 next week!) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-01/msg00533.html (7,969 bytes)
63. Re: [Amps] Tuned Input (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 23 Jan 2006 12:51:55 +0100 (CET); G3SEK said: <the Collins authors show a driver with an output pi-tank, the magic length of line and a pi-tank input on the amplifier.> I believe that there was a 'magic length' that covered all the h; /archives//html/Amps/2006-01/msg00535.html (9,614 bytes)
64. Re: [Amps] 3-500 / 4-400 cooling (09/10/2005) (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 31 Jan 2006 01:56:54 +0100 (CET); The British (and a few other armies') D11 and D13 transmitters cooled 4-125 (D11) and 4-250 (D13) by blowing air from the top. They suffered badly from this socket problem. If you figure that Eimac d; /archives//html/Amps/2006-01/msg00741.html (8,770 bytes)
65. Re: [Amps] 3-500 / 4-400 cooling (09/10/2005) (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 31 Jan 2006 20:57:02 +0100 (CET); that passes air to the base.< I think that particular E.F.Johnson socket was the one developed for the 826, 829 and 832 series, all of which had an exhaust tube that poked through that hole. Like the; /archives//html/Amps/2006-01/msg00774.html (8,567 bytes)
66. Re: [Amps] RE : RFI Question (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 4 Feb 2006 18:17:21 +0100 (CET); use microwave radars< Even so called 'stealth' aircraft can be detected by the reflections from them of signals such as TV transmitters, cell phone networks and the like. Roke Manor Research in the; /archives//html/Amps/2006-02/msg00086.html (7,282 bytes)
67. Re: [Amps] FW: RFI Question (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 4 Feb 2006 18:39:10 +0100 (CET); Larry asked: absorbent material and how is it applied to the metal surfaces? How does rf absorbent material react to different ranges of wavelengths?< RAM (Radar Absorbent Material) varies, depending; /archives//html/Amps/2006-02/msg00089.html (7,692 bytes)
68. Re: [Amps] T networks and harmonics (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 6 Feb 2006 14:45:49 +0100 (CET); attenuate harmonics.< I presume you used a T consisting of series C and shunt L? When resonant, matching between differing impedances, it will attenuate harmonics, but not as well as a T using 2 seri; /archives//html/Amps/2006-02/msg00126.html (7,583 bytes)
69. Re: [Amps] T networks and harmonics (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 8 Feb 2006 12:23:29 +0100 (CET); One of the problems here is that the various parts of the FCC don't talk to each other! Made worse by the fact that Bill Luther who goes to the relevant bits of ITU Study Group 1 and Bill Cross, who; /archives//html/Amps/2006-02/msg00185.html (8,731 bytes)
70. RE: *** SPAM *** [Amps] More on vacuum tubes, getters, processing TSPA (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 8 Feb 2006 17:32:54 +0100 (CET); So what happened to the use of tantalum anodes, as in the 24G and 35T? These were supposed to run white hot so that they absorbed gas, being one of the few materials that actually does so. Of course,; /archives//html/Amps/2006-02/msg00192.html (7,747 bytes)
71. Re: [Amps] Automatic bandswitching (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 15 Feb 2006 17:48:24 +0100 (CET); Chuck asked: If you're talking tubes, it's interesting. PIN diodes are available that withstand 2000 volts, so for say a pair of 3-500Z at 3000 volts, you'd need at least 3 in series. But then the pr; /archives//html/Amps/2006-02/msg00268.html (7,026 bytes)
72. Re: [Amps] Automatic bandswitching (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 15 Feb 2006 21:44:07 +0100 (CET); WARC) network?< I suspect it would be REAL fun trying to make one to cover all the HF ham bands below 30MHz. A problem is that you can get it to resonate at two frequencies at once, where one is a ha; /archives//html/Amps/2006-02/msg00272.html (8,057 bytes)
73. Re: [Amps] 87A vs. IC-PW1 (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 22 Feb 2006 22:41:27 +0100 (CET); I suspect it will last for the same sort of reasons people take pride in building furniture, musical instruments, doing model engineering and so on - the absolute pleasure of being able to exercise a; /archives//html/Amps/2006-02/msg00402.html (8,213 bytes)
74. Re: [Amps] Nat NCL2000 (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 23 Feb 2006 18:29:32 +0100 (CET); I'm not that convinced that any ALC really does....it's usually implemented such that it's trying to close the door after the horse has bolted. I suspect that to avoid that approach, the ALC needs to; /archives//html/Amps/2006-02/msg00448.html (7,905 bytes)
75. Re: [Amps] [BULK] - DIN stands for....? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Mon, 27 Feb 2006 19:31:28 +0100 (CET); I haven't had problems with DIN plugs. But then, I don't buy the cheap ones with thermoplastic insulation. You don't always get what you pay for, but you very rarely get something useful which you do; /archives//html/Amps/2006-02/msg00622.html (7,343 bytes)
76. RE: [Amps] [BULK] - DIN stands for....? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 28 Feb 2006 01:46:27 +0100 (CET); As far as I'm aware, Plessey Connectors died a long time ago, some time after G8LT retired as Managing Director. Not sure who GEC sold it to. The only good thing about the GEC take over of Plessey wa; /archives//html/Amps/2006-02/msg00649.html (7,526 bytes)
77. Re: [Amps] HB amps (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 4 Mar 2006 12:36:27 +0100 (CET); I don't think I'd go for just 2 - 3 or 4 is likely a better bet. A pair of them are rated for about 2400watts PEP output in plate and screen modulated AM, so provided they still have emission, runnin; /archives//html/Amps/2006-03/msg00060.html (9,226 bytes)
78. Re: [Amps] testing 572 B tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 4 Mar 2006 12:44:03 +0100 (CET); If the tubes are soft, there will be (usually) a blue glow between electrodes when drawing current (I have seen it tend more to purple). The emission could be down, which would explain the problem: y; /archives//html/Amps/2006-03/msg00061.html (7,309 bytes)
79. Re: [Amps] testing 572 B tubes (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 5 Mar 2006 12:57:58 +0100 (CET); The original questionner asked if maybe the tubes were soft. My suggestion was that if they weren't (no blue or purple glow between electrodes), low emission was a more likely cause of his problem. I; /archives//html/Amps/2006-03/msg00082.html (8,480 bytes)
80. Re: [Amps] Speaking of PIN T/R switches (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 7 Mar 2006 09:20:47 +0100 (CET); The main point about the PIN diode is that you need a long carrier life time - 5 to 10 microseconds is good for 160m and up. I STRONGLY recommend reading the application notes at Microsemi.com - that; /archives//html/Amps/2006-03/msg00162.html (8,708 bytes)

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