Andy, mine sounds very much like your recording. When on FT8 and using the KPA500 I usually set its fan to 2 and it seldom ramps up past that speed.
Your recording sounds very normal to me. Maybe not a good thing but normal :) 73 - Mike - K9JRI > On Jul 18, 2018, at 7:25 PM, ANDY DURBIN <a.dur...@msn.com> wrote: > > > I placed my Android phone on top of my KPA500 and made a recording while > making a few cycles of FT8 TX/RX. The audio files can be found here: > > https://www.dropbox.com/sh/amfy3dz8pgl083n/AAAKi2GYripXyIDjiLpJ2hDwa?dl=0 > > > One file is the raw recording. The second has been processed in Audacity to > amplify to 0 dB peak. The file starts before the first TX. Next the hum of > the transformer can be heard with FT8 modulation in the background from TX > moni. As the recording progresses the changes in fan speed can be heard. > The click are always well above the fan noise. > > I used this recording to perform some spectral analysis of the clicks. I > took one sample at the click and another sample of the noise just before the > click. I then subtracted the noise from the click and I think I have a > reasonable click signature to use as a baseline for evaluating any mechanical > changes I make in an attempt to reduce the clicks. > > Crank it up and enjoy, especially if you think it's normal. > > 73, > Andy k3wyc > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to k9...@mac.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
