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"Richard Harrison" wrote:
Radio transmitters don`t produce significant harmonics. It`s the law. They are linear power sources. We can and do tune them for all the power they will produce under their particular operating conditions of drive and d-c power supply. They operate at more than 50% efficiency which means that they don`t take power 100% of the time, but are switched-off during part of the r-f cycle. Output impedance is thus an average over the entire cycle. It`s OK. We have no harmonics. Gaps are filled by the tank circuit and other filters. _______________ Note that without adjustment, modern, solid-state FM broadcast transmitters can (and do) provide 80% or better PA efficiency into a 50 ohm load across 20% bandwidth, with no tank circuit or other in-band filter(s). If this is done in a commercial service, certainly it could be done in amateur radio devices. Physics is not application-selective. Posters of various forms of "Absolute Truths" to the contrary might well do a bit more research. RF |
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