Poor man's beverage and diversity
Locked
12
12
 
|
There's another "K" (capitalized) -- other than kelvins -- that
has come up over the past few decades, and that is the use of the term K for the binary magnitude 0100 0000 0000 -- that is to say, 400 hexadecimal, or 1,024 decimal -- APPROXIMATELY, but not exactly, 1,000. This term is used to describe anything based on the binary system in computer-related (and perhaps other) disciplines. So, for example, a memory space (addressed and thus measured using the binary system) might be denoted as "256 KB". While one might think of this space offhandedly as being 256 thousand bytes, it is in reality 256 x 1,024 = 262,144 bytes. On the other hand, a communications speed of 840 kbps is not binary-based, and therefore means literally 840,000 bits per second. Bill W5WVO ----- Original Message ----- From: "Mike Harris" <[hidden email]> To: "Elecraft Reflector" <[hidden email]> Sent: Monday, December 08, 2008 9:32 AM Subject: Re: [Elecraft] Units > G'day, > > | The big "M" vs. small "m" is something I'm very aware of usually, but > I'm > | not sure what a big "K" indicates vs. a small "k". I've always just > | considered either to mean "kilo". > > Most prefixes which make a unit bigger are written in capital letters (M, > G, T etc) and when they make a unit smaller lower case is used (m, n, p > etc). One of the exceptions is kilo (k) which is used to avoid possible > confusion with kelvin (K). > > Regards, > > Mike VP8NO > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by Julian, G4ILO
Almost all of the SI unit magnitude prefixes are derived from
Greek words -- e.g., "mega", meaning 10^6, is derived from the Greek word for "large"; "micro", meaning 10^-6, is derived from the Greek word meaning "small"; "kilo", meaning 10^3, is derived from the Greek word for "one thousand" ... But "milli", on the other hand, meaning 10^-3, is derived from the Latin "mille", also meaning "one thousand". Milli appears to be the only commonly used magnitude prefix derived from Latin rather than Greek. (There are some obscure outliers... the prefix "femto" (10^-15) is actually derived from the Old Norse word for "fifteen". But most are from Greek.) Why is "micro" (10^-6) abbreviated by the Greek letter mu (ยต)? Obviously "m" was taken already by milli, so mu, the Greek equivalent letter of the Roman "m", was chosen. :-) (You can find out all kinds of useful and interesting things in a common English dictionary!) Bill W5WVO ----- Original Message ----- From: "Julian, G4ILO" <[hidden email]> To: <[hidden email]> Sent: Monday, December 08, 2008 10:40 AM Subject: Re: [K3] [Elecraft] Units > > > Dave Yarnes wrote: > > > > But I still have no idea how they ever got > > started using "M" that way. It sure didn't make any sense to me. > > > M = 1000 in Roman numerals. Perhaps that's it? > > ----- > Julian, G4ILO. K2 #392 K3 #222. > http://www.g4ilo.com/ G4ILO's Shack http://www.ham-directory.com/ Ham > Directory http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 > -- > View this message in context: http://n2.nabble.com/Poor-man%27s-beverage-and-diversity-tp1623198p1630010.html > Sent from the [K3] mailing list archive at Nabble.com. > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by Barry Garratt
On 12/8/2008 9:49 AM, Barry Garratt wrote:
> Actually a radian is an angular measurement whereas a Hertz (hertz) is a > frequency measurement. > > 1 radian = 57.2958 degrees > > 1 hertz = 1 cycle per second But, but, but..... 1 cycle = 360 degrees = 2*pi radians, so frequency can be expressed in radians/second, although the numbers get unwieldy because frequencies which are an integral number of Hertz are not an integral number if expressed in radians/second. I'm still not used to the Siemens (pronounced Zee-mans) replacing Mho for units of conductance. -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
I think the term used for the SI is "coherent," ie 1 x 1 = 1, none of your
dynes, cubits, foot-pounds etc. A pity our cousins from across the water are not all on board the SI express. David G3UNA > On 12/8/2008 9:49 AM, Barry Garratt wrote: > >> Actually a radian is an angular measurement whereas a Hertz (hertz) is a >> frequency measurement. >> >> 1 radian = 57.2958 degrees >> >> 1 hertz = 1 cycle per second > > But, but, but..... 1 cycle = 360 degrees = 2*pi radians, so > frequency can be expressed in radians/second, although the > numbers get unwieldy because frequencies which are an integral > number of Hertz are not an integral number if expressed in > radians/second. > > I'm still not used to the Siemens (pronounced Zee-mans) > replacing Mho for units of conductance. > > -- 73 de K2ASP - Phil Kane > Elecraft K2/100 s/n 5402 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by Bill VanAlstyne W5WVO
On 12/8/2008 10:50 AM, Bill W5WVO wrote:
> Why is "micro" (10^-6) abbreviated by the Greek letter mu ? > Obviously "m" was taken already by milli, so mu, the Greek > equivalent letter of the Roman "m", was chosen. :-) But, but, but..... back when I became a ham (1952) in high school and went on to engineering school the year after, in the era of "cycles" (not c/sec), capacitor values (we were first starting to get away from the term "condensers") were specified in mmf (milli micro farads) instead of pico farads as done today. Inductance was always specified in Henrys, but that gave rise to a lot of mirth because we had an Electronics teacher named Henry who, when he was "having a good time" at our expense, would boast that the "Henry" was named after him. :-) -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
> starting to get away from the term "condensers") were specified
> in mmf (milli micro farads) instead of pico farads as done > today. Phil: You sure it wasn't "micro-micro-Farad," denoted as either mmf or uuF? Paul, W9AC _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by David Cutter
Oh, I don't know - My favorite unit has always been Furlongs per Fortnight. I once converted the speed of light into those units and used it in a humorous problem in our club newsletter. Couple of guys actually got the right answer! - Jim, KL7CC David Cutter wrote: > I think the term used for the SI is "coherent," ie 1 x 1 = 1, none of > your dynes, cubits, foot-pounds etc. A pity our cousins from across > the water are not all on board the SI express. > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by David Cutter
> I think the term used for the SI is "coherent," ie 1 x 1 = 1, none of your
> dynes, cubits, foot-pounds etc. A pity our cousins from across the water > are not all on board the SI express. > > David > G3UNA > > > > On 12/8/2008 9:49 AM, Barry Garratt wrote: > > > >> Actually a radian is an angular measurement whereas a Hertz (hertz) is a > >> frequency measurement. > >> > >> 1 radian = 57.2958 degrees > >> > >> 1 hertz = 1 cycle per second etc. One problem is that "cycles" are not really units, [nor are radians]. That is to say they don't HAVE units. They are non-dimensional. F'rinstance, look at the relationship between the speed of light, wavelength, and frequency: c = lf [I prefer "lambda" for l, and "nu" for f, but my e-mail client won't type those very easily] c = speed of light in meters [or metres] per second l = wavelength in meters f = frequency in ???? Well, it has to be inverse seconds [sec^-1] for things to work out. There aren't any "cycles" or "radians" in that frequency figure. We physics types often use "angular frequency" instead of "frequency". We just multiply f by 2pi to get angular freqency. [It's still in inverse seconds.] Why would anyone want to do that? Look at your formulas for capacitive and inductive reactance for hints. That's why it's silly to have defined the Hertz as the inverse second. What's even sillier is having defined inverse Ohms as Mhos. I don't believe there ever was a Mr. Mho. [Mho Nomis Groeg??] Radio is sure fun! vy 73, George T Daughters, K6GT CU in the California QSO Party (CQP) October 3-4, 2009 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by David Cutter
For goodness sake - give it a rest everybody with this inane drivel.
This is supposed to be the Elecraft reflector...... Mr Moderator - PLEASE!!!!!!! Tom GM4FDM David Cutter wrote: > I think the term used for the SI is "coherent," ie 1 x 1 = 1, none of > your dynes, cubits, foot-pounds etc. A pity our cousins from across > the water are not all on board the SI express. > > David > G3UNA > > >> On 12/8/2008 9:49 AM, Barry Garratt wrote: >> >>> Actually a radian is an angular measurement whereas a Hertz (hertz) >>> is a >>> frequency measurement. >>> >>> 1 radian = 57.2958 degrees >>> >>> 1 hertz = 1 cycle per second >> >> But, but, but..... 1 cycle = 360 degrees = 2*pi radians, so >> frequency can be expressed in radians/second, although the >> numbers get unwieldy because frequencies which are an integral >> number of Hertz are not an integral number if expressed in >> radians/second. >> >> I'm still not used to the Siemens (pronounced Zee-mans) >> replacing Mho for units of conductance. >> >> -- 73 de K2ASP - Phil Kane >> Elecraft K2/100 s/n 5402 > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > > > --- > avast! Antivirus: Inbound message clean. > Virus Database (VPS): 081208-0, 08/12/2008 > Tested on: 08/12/2008 19:52:17 > avast! - copyright (c) 1988-2008 ALWIL Software. > http://www.avast.com > > > > -- So I met the bloke who invented crosswords today. I can't remember his name, it's P something T something R. --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 081208-0, 08/12/2008 Tested on: 08/12/2008 19:55:20 avast! - copyright (c) 1988-2008 ALWIL Software. http://www.avast.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by Jim Wiley-2
Thanks for the units info.
Has been a good refresher. I was using KHz, now I know to use kHz. 73, Ty _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by gdaught6
On 12/8/2008 11:40 AM, [hidden email] wrote:
> What's even sillier is having defined inverse Ohms as Mhos. I > don't believe there ever was a Mr. Mho. [Mho Nomis Groeg??] Surely a Stanford physicist can recognize that Mho is Ohm spelled backwards! > Radio is sure fun! I should hope so. :-) -- 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 From a Clearing in the Silicon Forest Beaverton (Washington County) Oregon _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by David Cutter
On Dec 8, 2008, at 11:09 AM, David Cutter wrote: > A pity our cousins from across the water are not all on board the SI > express. > David Yes, it is. And we still refer to our archaic system as the English system. We actually had a push to go metric in the mid 1800's but only got as far as changing the inch by a small enough amount to make 2.54 cm equal exactly 1 inch. It used to be based on the length of a small worm (: Even countries using the metric system don't get it right. Speed is measured in kilometers per hour. The hour is not a metric unit. It should be meters per second for traffic signs and weather reports. I worked for the local power coumpany and they are half right. They use the watt for power but the watt hour for energy, which again messes up the units for metrics. 3600 joules per watthour just doesn't get it. And every other form of energy has its own unit of measurement. Yuck. But I do what I can. I named my sailboat STORMJOULE. The dingy was ERG. 73 Rick Dettinger K7MW as in MegaWatt (: _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
> But I do what I can. I named my sailboat STORMJOULE. The dingy was ERG. And a Kilometer is the amount of effort need to raise one kilo up one meter... hi hi _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
I thought a kilometer was a device used to measure cocaine. - Jim, KL7CC Toby Deinhardt wrote: > > And a Kilometer is the amount of effort need to raise one kilo up one > meter... hi hi > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
Re: Units [END of THREAD]
|
Administrator
|
Must be a slow news day..
Let's end this thread -now-. Its way past the point of topic email overload and some of theposts are getting silly ;-) 73, Eric WA6HHQ Elecraft List Moderator _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by David Cutter
David Cutter wrote:
> A pity our cousins from across the water are > not all on board the SI express. David, we colonists are going metric ... inch by inch. 73, Fred K6DGW - Northern California Contest Club - CU in the 2009 Cal QSO Party 3-4 Oct 2009 - www.cqp.org _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
|
|
In reply to this post by Bill VanAlstyne W5WVO
Silly thread -- :-) -- but it is important to keep one's facts www.N4LCD.com/electricalhistory/ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
«
Return to [K3]
|
1 view|%1 views
| Free forum by Nabble | Edit this page |