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Total 8 documents matching your query.

1. [Amps] Expert 1k amp (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Thu, 07 Mar 2013 08:50:10 +0000; Yesterday I did some minor repairs to a friend's amp - resoldering joints on the current sensing resistor. Looking at the circuits later I noticed that the main supply voltage is regulated by having; /archives//html/Amps/2013-03/msg00073.html (6,873 bytes)
2. Re: [Amps] Expert 1k amp (score: 1): Author: peter chadwick <g8on@fsmail.net>; Date: Thu, 07 Mar 2013 11:05:52 +0100; Steve, How much filtering is there to meet EU regs on noise put on the mains, and is there any power factor correction circuitry? 73 Peter G3RZP Yesterday I did some minor repairs to a friend's amp -; /archives//html/Amps/2013-03/msg00074.html (8,203 bytes)
3. Re: [Amps] Expert 1k amp (score: 1): Author: Steve <g8gsq72@gmail.com>; Date: Thu, 07 Mar 2013 10:21:43 +0000; The diagrams I looked at came from here: ok1hra.nagano.cz/Expert_Schematic_diagramsII.pdf I can't see any mains filtering, and no power factor correction. The repairs on my friend's amp required no m; /archives//html/Amps/2013-03/msg00075.html (8,191 bytes)
4. Re: [Amps] Expert 1k amp (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 7 Mar 2013 08:06:40 -0500; Steve, I did an unscientific check with my SPE 1K. Ripple on the RF envelope at the 1KW level is no worse than with my Alpha 77Dx and 87A at 1500W. It's just noticeable on the scope at the maximum po; /archives//html/Amps/2013-03/msg00076.html (9,852 bytes)
5. Re: [Amps] Expert 1k amp (score: 1): Author: TexasRF@aol.com; Date: Thu, 7 Mar 2013 08:39:08 -0500 (EST); This sounds like a product just begging for liquid/water cooling of the heat sink. -40 dBc imd at that power level is the real ticket! 73, Gerald K5GW In a message dated 3/7/2013 7:07:22 A.M. Central; /archives//html/Amps/2013-03/msg00077.html (9,468 bytes)
6. Re: [Amps] Expert 1k amp (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 7 Mar 2013 11:58:27 -0500; Is the ARRL still using a 6dB fudge with the way they measure IMD? Carl KM1H Steve, I did an unscientific check with my SPE 1K. Ripple on the RF envelope at the 1KW level is no worse than with my Alp; /archives//html/Amps/2013-03/msg00078.html (11,192 bytes)
7. Re: [Amps] Expert 1k amp (score: 1): Author: tlthompson <tlthompson@qwest.net>; Date: Thu, 07 Mar 2013 10:12:09 -0700; Yes they are. Carl KM1H Steve, I did an unscientific check with my SPE 1K. Ripple on the RF envelope at the 1KW level is no worse than with my Alpha 77Dx and 87A at 1500W. It's just noticeable on the; /archives//html/Amps/2013-03/msg00079.html (11,461 bytes)
8. Re: [Amps] Expert 1k amp (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Thu, 07 Mar 2013 22:17:28 +0000; Thanks for the info. Paul, very interesting. The supply voltage drops from 40odd to 30odd volts with power reduction so I'm guessing the current drops 20% or so, with dissipation roughly halving. Ste; /archives//html/Amps/2013-03/msg00083.html (8,784 bytes)

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