On 24/11/12 17:37, k7udr wrote:
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)
The former versions look better to me. Better 70cm than 2.3ft.
I then learned that bps should be b/s and dBm don't exist.
Further ppm is incorrect.
Either bps or b/s is fine with me, as is ppm.
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
Am I out of touch with reality? Are you offended by 56
I'd like to hear others thoughts on this, particularly
those of you educated somewhere other than the US
Those are my thoughts. I learned the SI system at school and have
an engineering degree. I may laugh at the imperial units system on
a regular basis but there's nothing wrong with the examples you've
I'd rather not get drawn into a discussion on gibibits and those
other awful prefixes though. Confusion often arises from the notion
that 1kB can not be sent in 8 seconds through a 1kb/s channel, as
1kB is 1*2^10 bytes and 1kb/s is 1*10^3 bits per seconds, but more
confusion arises from using ridiculous prefixes. For that reason
alone, I prefer sticking to the base unit of bps or b/s.
I think you've been trolled :P