Opinions on SI

"k7udr" <bhhoyer@...>

After a recent presentation I was approached by a fellow Ham who noted that my presentation did not conform to SI (International system of units). He offered a training exercise in the proper usage which I accepted. I must admit, I was ignorant of SI prior to that time.

Apparently, SI is taught in grade school throughout the world, whereas my US education seems to be lacking.

So I went through my material fixing obvious offenders, like proper capitalization and the use of a space between value and units.

the K in kilo should be lowercase
70cm should be 70 cm
12VDC should be DC 12 V (looks pretty awkward to me)

I then learned that bps should be b/s and dBm don't exist. Further ppm is incorrect.

Now I've never seen b/s used by anyone, anywhere and I certainly wouldn't want a table of values expressed as:

dB referenced to 1 mW

instead of dBm

When I purchase an oscillator, tolerance is expressed in ppm, so apparently the manufacturers are unaware of their non-conforming usage.

Am I out of touch with reality? Are you offended by 56 kbps?

I'd like to hear others thoughts on this, particularly those of you educated somewhere other than the US


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