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

Bryan

Join main@nw-digital-radio.groups.io to automatically receive all group messages.