Mail Archive Search: <+from:g8gsq@eltac.co.uk>

Results:

References: [ +from:g8gsq@eltac.co.uk: 415 ]

Total 415 documents matching your query.

21. Re: [Amps] Designing the Cleanest Linear with RF Negative Feedback (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 23 Dec 2005 11:11:53 +0000; A few thoughts covering several recent posts: Stability with tetrode amps should not be a problem if you use ceramic tubes with the proper bases. More than anything, I think it's the lead length in g; /archives//html/Amps/2005-12/msg00304.html (9,512 bytes)
22. Re: [Amps] Purpose of cathode resistor? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 28 Dec 2005 18:15:14 +0000; That was my immediate thought, but won't the cathode stop rising once it reaches the tube's cut off bias? Steve _______________________________________________ Amps mailing list Amps@contesting.com h; /archives//html/Amps/2005-12/msg00355.html (7,308 bytes)
23. Re: [Amps] GS-35B Grid Current? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 31 Dec 2005 22:55:15 +0000; I'm lost for words! Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2005-12/msg00411.html (6,929 bytes)
24. Re: [Amps] Parasitic suppressor resistor (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 02 Jan 2006 09:04:55 +0000; Having the L in the resistor is different from having it in series with the resistor/inductor suppressor. Whether the difference matters is unique to your amplifier and its gain/phase characteristics; /archives//html/Amps/2006-01/msg00045.html (8,913 bytes)
25. Re: [Amps] Parasitic suppressor resistor (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 02 Jan 2006 15:53:05 +0000; Did he (or she) indicate whether the grid grounding and/or cathode impedance made any difference? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://li; /archives//html/Amps/2006-01/msg00072.html (9,832 bytes)
26. Re: [Amps] Parasitic suppressor resistor (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 02 Jan 2006 18:19:02 +0000; I can't help but think that a low inductance Xc=5-10 ohms from cathode to ground would make a big difference to the calculation. Cutting the loop gain by 7-10dB is a good recipe for better stability.; /archives//html/Amps/2006-01/msg00086.html (11,158 bytes)
27. Re: [Amps] Parasitic suppressor resistor (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 03 Jan 2006 08:00:42 +0000; It will depend on the impedance presented to the cathode at VHF. If the capacitance to ground is on the end of a wire and/or bandswitch, it's not going to provide a low Z to ground except where it's; /archives//html/Amps/2006-01/msg00123.html (10,990 bytes)
28. Re: [Amps] 4-400 output problem (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 07 Jan 2006 08:28:47 +0000; What does the plate current do? Do you have numbers for current vs drive power? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2006-01/msg00244.html (7,500 bytes)
29. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 09 Jan 2006 08:23:15 +0000; Most amplifiers can achieve 65% efficiency but will be noticably cleaner if they're correctly tuned/loaded for 50-55%. Steve _______________________________________________ Amps mailing list Amps@con; /archives//html/Amps/2006-01/msg00258.html (8,292 bytes)
30. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 09 Jan 2006 16:11:17 +0000; For high order IMD - which is what affects your neighbours most, the improvement can be higher. It gets you a slightly higher electricity bill, and (hopefully) thanks and respect from your fellows. I; /archives//html/Amps/2006-01/msg00266.html (10,542 bytes)
31. Re: [Amps] Westinghouse BC Ammeter QX-37 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 09 Jan 2006 16:17:35 +0000; Whether it's amplifiers, car exhaust or personal hygiene, clean is lost when surrounded by dirty. Change the balance bit by bit, and suddenly dirty stands out like a sore thumb. Steve _______________; /archives//html/Amps/2006-01/msg00268.html (10,160 bytes)
32. Re: [Amps] Clean -vs- Unclean (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 09 Jan 2006 16:23:53 +0000; Be wary of manufacturer's comparisons. They're often not entirely like for like. Depends on the amplifier type and design, but the most significant factor is usually the rf device and how hard it's r; /archives//html/Amps/2006-01/msg00270.html (7,941 bytes)
33. Re: [Amps] Clean -vs- Unclean (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 09 Jan 2006 18:55:19 +0000; I'd often wondered about modifying our contest exciter to provide an additional path round the narrow filter after the rf processing - putting the cliped signal through a 15kHz filter and injecting s; /archives//html/Amps/2006-01/msg00293.html (9,402 bytes)
34. Re: [Amps] GS-35B Vertical Mounting & Input Impedance (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 11 Jan 2006 22:41:23 +0000; Yes - assuming it's not full of loose stuff. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-01/msg00348.html (6,598 bytes)
35. Re: [Amps] Burn-in for Eimac? (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 16 Jan 2006 07:41:20 +0000; Debates will rage over whether it's necessary, but I can't see how it can do any harm. My first reaction is to think it's ready to go - but it's been cold for 8 years. I don't know if there's a risk; /archives//html/Amps/2006-01/msg00401.html (7,298 bytes)
36. Re: [Amps] LK-500 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 17 Jan 2006 16:53:57 +0000; A while ago I looked at the ratings on Philips electrolytics, where you can get physically identical capacitors, one family with 85C rating, the other with 105C rating. For the same value, the ripple; /archives//html/Amps/2006-01/msg00427.html (7,956 bytes)
37. Re: [Amps] LK-500 (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 17 Jan 2006 23:00:52 +0000; Doubtless thay have different specs. from those older ones. There's nothing in the Panasonic TS family rated at 85C to compare with the P11691. Considering a couple of others, both 560uF, 450V, same; /archives//html/Amps/2006-01/msg00438.html (9,896 bytes)
38. Re: [Amps] DXpedition Amp Recommendation (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 18 Jan 2006 15:12:13 +0000; How about a couple of 500Wish 12V amps plus a splitter/combiner, so you get reasonable quality at 400W output, then buy some car batteries and a charger once you're there - or take a switch mode PSU; /archives//html/Amps/2006-01/msg00446.html (7,816 bytes)
39. Re: [Amps] Ten Tec Herc 444 (original Herc) (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 20 Jan 2006 07:42:13 +0000; There's a copy of the handbook with schematics at http://www.qsl.net/tentec/ttamp.htm but some bits at the tops of pages (incl. part of the regulator) seem to have got sliced off. The regulator is un; /archives//html/Amps/2006-01/msg00481.html (8,400 bytes)
40. Re: [Amps] Tuned Input (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sat, 21 Jan 2006 07:48:31 +0000; That's always been my understanding of what's best for the configuration. That's likely to have the side benefit of improving vhf stability. Steve _______________________________________________ Amps; /archives//html/Amps/2006-01/msg00497.html (8,830 bytes)

Current List: 21 - 40
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]