Charles
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David's first amateur radio license was KN1FWP in 1963, later K1FWP General Class in 1964. In the 1960s, he resided in Massachusetts. His call sign changed in mid 1970s to W3HYM, when his residence relocated to Maryland. He currently holds Extra Class. David loves boat anchors. He has Collins 75A-4, 32V-3, 51J-4, R390A, KWM2, and three Drake TR-7s. In the 1960s, he built several transmitters (HF, 6 meters and 2 meters) and a 6 meter linear amplifier using a 4CX250R. Currently, his favorite bands include 40, 20, 10, 6 and 2 meters, 70 and 23 centimeters. He has a particular interest in Phase 3D AMSAT satellite. He currently is building an HF transmitter, capable of the legal limit. Thus far, he completed the HV power supply, control deck including screen and grid power supplies, metering decks for grid, screen and plate current and voltage. He constructed amplifier modules for 10, 15, 20, 40 and 160 meter bands. Each of the 10, 15, 20 and 40 meter band moduless uses two 813s in parallel. The 160 meter band amplifier uses four 813s, all in parallel. He desigend for each band module, for the output, a Pi-L tuned circuit connected to the plates of 813s through blocking capacitors. The amplifiers can operate class AB or class C. A modulator is partially designed and constructed. The basic transmitter for driving the amplifiers is at initial stages of construction. ?????? ????????????. ???? ????? DAVID. ? ??????? ???????. ??? 55 ???. ? ?????? ? ?????????. ??????? ? ???? ????? ??????? ?????????? ?????. ????? ????? ? ??????????? ???????. ????? Jazz ? Dance Music. ????? ?? ??????????? ??????. ? ???? ???? ???. ??? ????? Denis. ?? ?????????????, ???????? G3UVR ? ??? ???? Carol ???? ?????????????, ???????? G4PUH. ??? ????? ? 5 ?????????? ?? ????. ? ????? 3 ???? ? ??????. ? 1992 ? 1996 ???? ? ?????? ?? ?????? ? ??????. ??????? ??????, ??????, ????????, ?????? ? ?????????????. ? 1994 ???? ? ?????? ?? ?????? ?? ??????. ??????? ?????????? ?????? ??????????. ? 1992 ? ???? ??????? ??????? ? ? ???????? ?????, ?????, ?????????? ? ?????? ??????. ? 1994 ???? ? ???? ??????? ???? ? ???????. ? 1996 ???? ? ??????? ??????? ?????. ?? ???? ?????? ? ?????? ?????? ?????.