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Total 19 documents matching your query.

1. [Amps] Ceramic capacitor ratings (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 12 Apr 2007 12:58:01 -0400; Working on my TMC amp with the pair of 3-500Z finals and the toroid tank coil. 1.6-18 MHz. I tried a tank coil for 20 meters that I made out of ¼ inch copper tubing, 2? diameter and 8 turns. I; /archives//html/Amps/2007-04/msg00094.html (7,919 bytes)
2. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Dan Hearn" <dhearn@air-pipe.com>; Date: Thu, 12 Apr 2007 22:21:58 -0700; Gary, a similar question was asked several years ago on amps and I replied to it with values from some info I have on CRL doorknob ratings. I can't seem to locate my data but here is my post. My unde; /archives//html/Amps/2007-04/msg00103.html (8,811 bytes)
3. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 13 Apr 2007 11:12:08 +0200 (CEST); Why should the current have gone up? Yes, the unloaded coil Q is higher, but the working Q should, all things being otherwise equal, the same. Thus the circulating current is the same. There's less l; /archives//html/Amps/2007-04/msg00105.html (7,293 bytes)
4. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 13 Apr 2007 11:11:50 -0400; Hi Dan, Thanks for the reply. I did run across your old post on the subject however I am not sure you were talking about the same capacitors that I have. I found on the rf parts web site the 850s cap; /archives//html/Amps/2007-04/msg00106.html (11,219 bytes)
5. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 13 Apr 2007 11:20:57 -0400; Hi Peter, I think my working Q has gone up also with the addition of the large copper coil as tuning is sharper than before. I measured the total capacitance of the plate tune circuit with the coil r; /archives//html/Amps/2007-04/msg00107.html (9,445 bytes)
6. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Fri, 13 Apr 2007 15:30:57 -0400; Hi ye all, I feel you are worrying too much about Q and the like. Make it simple, guys! Start from the basics: You know the operating frequency, and the total tuning capacitance value. Take the maxim; /archives//html/Amps/2007-04/msg00109.html (9,253 bytes)
7. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 13 Apr 2007 23:10:16 +0200 (CEST); Gary, I would argue that if the impedance presented to the plate is the same, then the loaded Q should be pretty much the same. The laod impedance that the plate sees affects directly the power outpu; /archives//html/Amps/2007-04/msg00110.html (8,918 bytes)
8. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 13 Apr 2007 18:11:14 -0400; Hi Manfred, Thanks for the comments. I understand what you are saying about the current thru the capacitor by using the plate voltage to figure the current thru its reactance but isn't there also cir; /archives//html/Amps/2007-04/msg00111.html (12,430 bytes)
9. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 13 Apr 2007 18:31:38 -0400; Hi Peter, But isn't loaded Q also dependent on coil loss and circulating current dependent on loaded Q? See my comments to Manfred. 73 Gary K4FMX _______________________________________________ Amps; /archives//html/Amps/2007-04/msg00112.html (9,257 bytes)
10. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Fri, 13 Apr 2007 19:00:02 -0400; Hi Gary, Yes, and actually this current (to the coil) is much larger than the current coming through the the tube! But this doesn't affect the calculation at all, since the tube plate, tuning cap top; /archives//html/Amps/2007-04/msg00113.html (10,290 bytes)
11. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 13 Apr 2007 22:53:06 -0400; The dc plate voltage is the peak RF voltage in a very hard switched PA, so RMS plate voltage would be about .71 times anode voltage but this ignores harmonics. In linear PA's it less, since the anod; /archives//html/Amps/2007-04/msg00115.html (8,706 bytes)
12. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Fri, 13 Apr 2007 23:09:21 -0400; Now the question is about ceramic padder capacitors used in the plate tune circuit. There is a variable plate tune cap that is 23-347 pf that is in series with two (parallel) ceramic small door knob; /archives//html/Amps/2007-04/msg00116.html (9,222 bytes)
13. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Sat, 14 Apr 2007 10:14:09 -0400; Hi Tom, switched PA, If we want to be precise, we would have to see in which class the amplifier operates. Hard switched in class C or class E? While the lowest instant voltage depends on the tube sa; /archives//html/Amps/2007-04/msg00117.html (11,592 bytes)
14. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 15 Apr 2007 07:43:55 +0200 (CEST); amplifier in ham use will run in ICAS, and typically in SSB, with an average much below the peak. So it turns out that those 100pF caps in practice will just be loafing along!< I would have supported; /archives//html/Amps/2007-04/msg00126.html (8,804 bytes)
15. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Robert Bonner" <rbonner@qro.com>; Date: Sun, 15 Apr 2007 08:02:18 -0500; Boy exactly Peter... I've always thought the same thing. Pop the top off an amplifier rated at such and such and go, whoa, these guys are dreaming. Every amplifier I've built after the first few were; /archives//html/Amps/2007-04/msg00127.html (10,420 bytes)
16. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Tom Osborne" <w7why@verizon.net>; Date: Sun, 15 Apr 2007 08:54:21 -0700; That's a fact. I had a friend who worked in a TV repair shop and the TV company said if they could remove one part and the TV would still work, they'd give them $100. 73 Tom W7WHY ___________________; /archives//html/Amps/2007-04/msg00130.html (8,309 bytes)
17. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: Bob Nielsen <nielsen@oz.net>; Date: Sun, 15 Apr 2007 09:07:29 -0700; I remember the same story, but it was about Muntz televisions in the 1950s (Earl "Madman" Muntz, who also was a used car dealer and manufactured the Muntz Jet sportscar). 73, Bob N7XY _______________; /archives//html/Amps/2007-04/msg00131.html (11,919 bytes)
18. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Pfizenmayer" <pfizenmayer@worldnet.att.net>; Date: Sun, 15 Apr 2007 09:25:28 -0700; As to the clipping out parts - I went to a co-op school (U of Cincinnati) in the late 50's and my first co-op job was at Crosley Div of AVCO Electronics . I was doing a different job on some antennas; /archives//html/Amps/2007-04/msg00132.html (9,593 bytes)
19. Re: [Amps] Ceramic capacitor ratings (score: 1): Author: "Jim Tonne" <tonne@comcast.net>; Date: Sun, 15 Apr 2007 15:08:31 -0400; And the model of the TV receiver was the "Metropolitan", presumably because that's where it would work. Only. - JilmT _______________________________________________ Amps mailing list Amps@contestin; /archives//html/Amps/2007-04/msg00143.html (8,487 bytes)

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