"it is hard to tell if the overall ticking is tracking the temp"
It's quite instructive to view the file in Audacity. That shows clearly that the groups of clicks that happen during the heating cycle are about half the amplitude of the group of click that happen during the cooling cycles. The fan speed gives a indication of PA temperature. Although I normally record PA temperature and fan speed my logger was not running when this audio file was recorded. This morning I removed the top cover and placed two thicknesses of Scotch double sided foam mounting tape on the top cover half way between the back and the vent holes. This presses on the heat sink fins and reduces the ringing a bit. I found I could still excite the fins by plucking them with a tooth pick inserted through the air holes. Subjectively the clicks seem to have less ring to them but I need to refine my spectral analysis technique to be sure what difference it actually made. I see no reason that dampening material couldn't be place on top of all the fins except those directly under the air vent holes. More to be done but it appears that ringing of the heat sink contributes to the problem. Next step will be to find out what excites the heat sink and eliminate if possible. I know it has been stated that it's movement between Z bracket and heatsink but I need to find out for myself. For those with a concern about my priorities - both this investigation and my Arduino coding are done while watching 6 m for an opening (CT and EA worked from AZ yesterday). 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 arch...@mail-archive.com
