Good discussion. For giggles I ran sound meter at my op position. About 1 ft below where my head would be so readings would be higher at head level. Fan Speed Level (db) 1 50 2 59 3 65 4 70 5 75
So it is going to take some good headsets to help significantly. Richard *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV *Be joyful in hope, patient in affliction, faithful in prayer* On Mon, May 28, 2018 at 8:50 AM, Bob McGraw K4TAX <[email protected]> wrote: > Although making things a bit larger physically, fans enclosed into the > equipment case, thus providing some acoustic dampening, and configured to > pull air into the case {along with much of the noise} and exhausting air > and noise through several ports is more applicable to reducing overall > noise. High volume air moved at slow rates is much quieter than the same > amount of high volume air moved at faster rates. Also, fans with a lower > blade tip velocity makes less noise. > > As I indicated in an earlier post, some fans are more efficient at > "blowing" i.e pressurizing the enclosure, while others are more efficient > at "sucking" thus evacuating the enclosure. In general, sound moves with > the air flow. > > 73 > > Bob, K4TAX > > > > On 5/28/2018 10:10 AM, Drew AF2Z wrote: > >> No KPA1500 here but I did replace the fans on my lil' ol KPA3 with >> Noctuas. They are noticeably quieter. If there is a suitable Noctua >> replacement for the KPA1500 fans you might want to compare the sound level >> specs to the Sanyo Denkis. >> >> Wonder if it would be possible to build an active noise cancelling system >> into the rig itself; seems like it would work in that enclosed space... >> >> 73, >> Drew >> AF2Z >> >> >> >> On 05/28/18 10:20, Richard Zalewski wrote: >> >>> First major contest with KPA-1500. Overall VERY pleased. No glitches >>> other than a few operator errors early in the contest. Loving the amp. >>> >>> Fan noise...another issue. Usually for a cw contest I use some old ear >>> buds. Not possible with the amp. Had to use the total ear muffs and >>> still >>> quite noisy. Did not effect my performance but it is annoying. I can not >>> imagine what it was like before they released the amp to general public >>> when they changed the fans...made them less noisy??? Still needs some >>> work >>> but at this point probably not possible. So looking for suggestions for >>> reasonably priced noise cancelling headset with mic if possible. >>> >>> Hope we get full explanation of what gets changed in the next firmware >>> release. >>> >>> Still smiling. >>> >>> Richard >>> *W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU, >>> J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV >>> >>> >>> *Be joyful in hope, patient in affliction, faithful in prayer* >>> ______________________________________________________________ >>> 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]
