I think a more realistic measurement than the original, phone on the amp
cabinet would be to place the phone on something like a tripod roughly
where the operators head might be. That is likely to be a more balanced
level.
That said I'm not sure that having the specific absolute level in one
particular environment is necessarily all that useful, in this case.
Having a number, defined in specific terms doesn't help me to feel one
way or the other if that would impact on my operating. But if I can hear
what Andy hears and it sounds anything like what he recorded then I
would be looking at ways to mitigate it. Recording and amplifying the
offending sound as much as necessary in order to identify the root would
seem a good start.
What Andy showed is that there is a ticking sound and that sound is
being produced by an action on one or more materials. If they can be
identified it is possible that sound can be reduced. Whetherit is a loud
or quiet sound is of less significance, we all hear differently.
Martin, HS0ZED
On 19/07/2018 09:31, Bob McGraw K4TAX wrote:
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
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