Thread View: dk.fritid.hamradio
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Started by Glenn
Tue, 29 Jan 2013 21:57
Pentode elektronrør og class E ?
Author: Glenn
Date: Tue, 29 Jan 2013 21:57
Date: Tue, 29 Jan 2013 21:57
62 lines
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3517 bytes
N�r man nu kan anvende teknikken class E med LDMOS - kan s� ogs� anvende class E til elektronr�r (PL84, EL84) p� f.eks. 2 meter b�ndet - eller PL519/EL519 p� HF i f�lles-katode kobling? Har nogen pr�vet det? Er r�rets Cac lav nok? Kan r�ret PL519 anvendes i f�lles-gitter med class E? - https://en.wikipedia.org/wiki/Class_E_amplifier#Class_E http://www.highfrequencyelectronics.com/Archives/Jul03/HFE0703_RaabPart2.pdf Citat: "... Class E employs a single transistor operated as a switch. The drain- voltage waveform is the result of the sum of the DC and RF currents charging the drain-shunt capacitance. In optimum class E, the drain voltage drops to zero and has zero slope just as the transistor turns on. The result is an ideal efficiency of 100 percent, elimination of the losses associated with charging the drain capacitance in class D, reduction of switching losses, and good tolerance of component variation. ..." (fundet via: http://www.highfrequencyelectronics.com/Archives/Archives2002-2003.shtml ) Design of Input Matching Networks for Class-E RF Power Amplifiers: http://www.highfrequencyelectronics.com/Archives/Jan11/HFE0111_Firas.pdf Class E kan g�res bredb�ndet: Design of a Microstrip Broadband LDMOS Class E Power Amplifier: http://www.highfrequencyelectronics.com/Archives/Mar10/HFE0310_Xu.pdf A High-Efficiency Transmission-Line GaN HEMT Class E Power Amplifier: http://www.highfrequencyelectronics.com/Archives/Dec09/HFE1209_Grebennikov.pdf Load Network Design Techniques for Class E RF and Microwave Power Amplifiers: http://www.highfrequencyelectronics.com/Archives/Jul04/HFE0704_Grebennikov.pdf An Outphasing Transmitter Using Class-E PAs and Asymmetric Combining: Part 1: http://www.highfrequencyelectronics.com/Archives/Apr11/HFE0411_Beltran-Etal_Part1.pdf An Outphasing Transmitter Using Class-E PAs and Asymmetric Combining: Part 2: http://www.highfrequencyelectronics.com/Archives/May11/HFE0511_Beltran.pdf - Linear-Endstufe mit PL509 / PL519: http://www.qrp4u.de/docs/de/PL519/index.htm Citat: "... Die fertige Endstufe wiegt nur 2,7 kg!! ..." 500 WATT PA (4*PL519) by Harry Lythall - SM0VPO: http://www.sm0vpo.com/tx/500w-txt.htm Glenn
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