Hi Tim, Look for a switching power supply that is fairly new, and is of the sort that doesn't need to be messed with to cover the full 120V to 240V range.
That sort of switcher is also known as a power factor correcting switcher. It has a PWM switched pre-regulator that takes the unfiltered ripple straight from a full wave bridge rectifier, and PWM's it so that it can charge the filter capacitor, without the power line seeing anything but a resistive load. It also controls the inrush current. PWM pre filters, because they quickly shift the pwm signal at a 120Hz rate, are capable of producing lots of broadband 120Hz modulated garbage if their shields, or filters are compromised. -Chuck Harris Tim Shoppa wrote:
Would any time-nuts know of radiolocation-type testing going on, on east coast of US, maybe around Maine? There is a very strong wideband signal on 1900-1920kHz, with a 120Hz substructure and a 4Hz rep-rate, likely megawatt power range. Sound sample (recorded with 2400Hz receiver bandwidth, although the whole signal is far far wider bandwidth) at http://www.trailing-edge.com/1910-intruder.wav Pics of the waveform at http://www.trailing-edge.com/1910-intruder-1.png and zoomed in at http://www.trailing-edge.com/1910-intruder-2.png Tim N3QE _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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