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Anyone tried to solder a resistor in series to the fan, to slow the fan down a little bit so that the fan doesn't make so much noise?
Does anyone operate the KiwiSDR without fan at all?
It is already running under voltage so if it is noisy it might be wear.
You could peel the sticker off the fan and oil the bearing/shaft.
I have only run the Kiwi+Beaglebone without the fan in another case (closer to the BeagleBone and lots of metal). A lot depends on the ambient temperature, if it is in a cool room I would think it will be OK but 30C or more not (just a wild guess).
Stu's suggestion of peeling back the label and lubing the bearing is really good advice.
I was consuming fans about every 6 months. They now run much quieter and I haven't had to replace one since doing this.