[Elecraft] KPA500 thermal clicks

[Bob McGraw K4TAX]

All of these "relative" recordings have little to no value in terms of 
"how loud" the noise may be.   Yes, it is there. Amplify it enough and 
it will blow the side of the house out.  The phone on top of the amp is 
certainly not where ones ear may reside.

If one wishes to cite how loud a sound exists, then use a sound level 
meter and measure the noise at a specific and stated distance and 
several different axis and report the level in dB. A weighted or C 
weighted.   Also measure and state the level of the room ambient.    Use 
a spectrum analyzer to quantify the nature or content of the sound, 
frequency and waveform.   Those numbers will then equate to something 
that is meaningful.   If others do the same, then there is contained 
evidence of units which may contribute to the artifact of concern.

73

Bob, K4TAX