Seems that the AC line supplying the equipment has a rather high impedance thus allowing the voltage to suddenly drop under the dynamic load and then surge to a higher than normal value.
A dedicated 120V and/or 240V service should be considered for the station power. Laser printers do draw considerable power when they start. Bob, K4TAX Sent from my iPhone > On Jun 27, 2018, at 2:00 PM, John Simmons <[email protected]> wrote: > > My Astron RS35 does the same thing under the same conditions. > > -John NI0K > > Matt NQ6N wrote on 6/27/2018 1:20 PM: >> My KPA500 makes a noticeable hum/thump when the laser printer that is on >> the same circuit draws a lot of current. >> >> 73, >> Matt NQ6N >> >> On Wed, Jun 27, 2018 at 12:58 PM Jim Brown <[email protected]> >> wrote: >> >>>> On 6/27/2018 10:37 AM, Richard Wade wrote: >>>> If I had to venture a guess, I would say that somehow the unpowered >>> KPA500 >>>> was picking up noise on the shack wiring. Very strange. Is that >>> possible?? >>> >>> It is if equipment in your shack is not properly bonded together, and to >>> house grounds that are also properly bonded together. Study N0AX's >>> recent ARRL book on the topic, to which I contributed, or the slides for >>> a tutorial talk I've done at several hamfests. >>> >>> http://k9yc.com/GroundingAndAudio.pdf >>> >>> 73, Jim K9YC >>> >>> >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [email protected] >>> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
