My measurements were taken with a microphone about 2 feet from the front panels of the components. I wondered if W2PA’s alpha 89 was as quiet as he reported, so I thought I’d report on what I found -
Ham shack in a finished (insulated drywall) room in a metal shed with equipment and HVAC off - 24 dBa Above with Mitsubishi HVAC on - 29 dBa HVAC was then turned off for the remainder of these measurements KPA1500 PS fans on, RF deck fans off (step 0) - 36 dBa KPA1500 PS fans on, RF deck fans at step 1 - 40 dBa KPA1500 PS fans on, RF deck fans at step 2 - 44 dBa KPA1500 PS fans on, RF deck fans at step 3 - 50 dBa KPA1500 PS fans on, RF deck fans at step 4 - 57 dBa KPA1500 PS fans on, RF deck fans at step 5 - 59 dBa alpha 87a (everything else off) - 50 dBa - the fans run at a fixed speed when mains power is applied My experience for S&P CW during WPX is that the KPA1500 PA temp rose to about 64C so that the deck fans were at Step 2. During a recent RTTY contest, the deck rose above 70C and the fans were running at Step 3 pushing a lot of warm air out of the vent holes above the heat sink. 73 & YMMV, Bob Rennard = N7WY ______________________________________________________________ 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]
