Re: [Elecraft] Puffing to keep up with the Nanofarads...
Yes, this does seem logical... I have a kit of precision resistors that's at least 15 years old that is marked in that way... so it's not new. I know there have been recent attempts to standardize on a new system for parts... put forth by CCIR or IEEE or someone. I guess I can deal with change, but there's something comforting about the system that was in place when I used to flip through the Allied and Lafayette catalogs as a youth... when the warm glow of vacuum tubes permeated the shack, when we used to have to trudge through a mile of 6' deep snow to go to school, when an atom was only made up of protons, neutrons and electrons... and when Superman stood for Truth, Justice and the American way ;-) Larry N8LP In Europe at least things seem to have gone another step forward in some quarters with what was expressed as 4.7nF (0.0047uF) now often written as 4n7. This follows through in other decades as 4p7 for 4.7pF, 4u7 for 4.7uF and so on. The idea also seems to have been used with resistors where a 0.47 ohm is seen as R47, a 4.7 ohm is now seen as 4R7, a 4.7K ohm as 4K7 and a 4.7M ohm as 4M7. The method has less chance of misinterpretation it would seem. The biggest change on my part was going from metres to kc/s and the like, kc/s to kHz not really representing a problem. Bob, G3VVT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Puffing to keep up with the Nanofarads...
At 09:06 PM 12/16/2004, Doug Faunt N6TQS +1-510-655-8604 wrote... And cycles for frequency, by itself means very little. The proper term was cycles per second, which is what Hertz replaces, not just cycles I don't think Mr. Hertz used cycles since he was a scientist, and would think accuracy of expression was important, but he probably used cycles per second. One might presume so, incorrectly. It was common convention to use kilocycles (KC) and megacycles (MC), excluding any reference to per second. Here's an ARC-5 transmitter, showing same: http://hug-a-bug.com/arc5b.jpg This convention also carried over into more formal texts: http://www.nj7p.org/manuals/arc-5/arc-5.html#_Toc460591310 Hertz himself, although occasionally making reference to times per second, more often used period of oscillation and usually used wavelength, which makes sense, since this was much easier to measure at the time. Here's a brief portion of Electrical Waves: http://historical.library.cornell.edu/gifcache/cdl/cdl334/00134.TIF6.gif ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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] Puffing to keep up with the Nanofarads...
Larry, N8LP wrote: Oops... it was pointed out to me off-list that the required cap is 4.7 nf... not the 4.7 pf I misread it as. I would expect 4.7 nf more commonly to be written as .0047 uf, but maybe it's an international thing. Your age is showing Larry. Even though I do it every day, day in and day out, nf just isn't intuitive to me. I constantly do a double-take and mentally shift that decimal point over three spaces. But we're doomed. The engineering schools today use nf just as often as my instructors used pf and ufd. My capacitor meter even defaults to the nf scale!!! Shoot, I remember when pf was never seen in electronics. Picofarad was written micro-microfarad or uufd. Sometimes I feel like I'm puffing along to keep up, Hi! Ron AC7AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Puffing to keep up with the Nanofarads...
Guilty on the age charge! I also remember uufd... and what's this newfangled Hz thing? Hi Hi. Larry N8LP Ron D'Eau Claire wrote: Larry, N8LP wrote: Oops... it was pointed out to me off-list that the required cap is 4.7 nf... not the 4.7 pf I misread it as. I would expect 4.7 nf more commonly to be written as .0047 uf, but maybe it's an international thing. Your age is showing Larry. Even though I do it every day, day in and day out, nf just isn't intuitive to me. I constantly do a double-take and mentally shift that decimal point over three spaces. But we're doomed. The engineering schools today use nf just as often as my instructors used pf and ufd. My capacitor meter even defaults to the nf scale!!! Shoot, I remember when pf was never seen in electronics. Picofarad was written micro-microfarad or uufd. Sometimes I feel like I'm puffing along to keep up, Hi! Ron AC7AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: [Elecraft] Puffing to keep up with the Nanofarads...
Larry, N8LP wrote: Guilty on the age charge! I also remember uufd... and what's this newfangled Hz thing? Hi Hi. That hurts too (pun intended). Ron (often found around 7,035 or 3,545 kc/s) AC7AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
FW: [Elecraft] Puffing to keep up with the Nanofarads...
Hertz's is kinda like cycles. When you hear 4 MHz, think 4000 KCS. Dan / WG4S / K2 #2456 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Larry Phipps Sent: Thursday, December 16, 2004 1:49 PM Cc: 'Elecraft@Mailman.Qth.Net' Subject: Re: [Elecraft] Puffing to keep up with the Nanofarads... Guilty on the age charge! I also remember uufd... and what's this newfangled Hz thing? Hi Hi. Larry N8LP ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: FW: [Elecraft] Puffing to keep up with the Nanofarads...
Mr. Hertz called them cycles !!! 73, Kurt ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Puffing to keep up with the Nanofarads...
My old physics professor made anyone using the term kilocycles ride one three times around the campus. Mr. Hertz called them cycles !!! ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Puffing to keep up with the Nanofarads...
Not to rain on anyone's parade, but I think I remember the terms and abbreviations were: Microfarads (mf) as in a 0.1mf wax impregnated paper condenser Micromicrofarads (mmf) as in a 3-section 365mmf air variable condenser for the TRF receiver. As I recall, it generally was kilocycles (kc or kcs) through ten meters, and thereafter megacycles (mc or mcs) up to what is now known as 1GHz (which was called a kilomegacycle [kmcs]). Anything above a few kilomegacycles hadn't been invented yet. I have learned to begin with I think I remember, because often I really don't remember. 73 and Happy Holidays to all Fred K6DGW Auburn CA CM98lw Ron D'Eau Claire wrote: Larry, N8LP wrote: Guilty on the age charge! I also remember uufd... and what's this newfangled Hz thing? Hi Hi. That hurts too (pun intended). Ron (often found around 7,035 or 3,545 kc/s) AC7AC ___ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Puffing to keep up with the Nanofarads...
I agree with all that, although I remember referring to GHz as gc (as in 2.1 gee-cee for 2.1 GHz). My profs only knew Hertz as a radio pioneer... not a term... and my textbooks as well (still have them). Larry N8LP Fred Jensen wrote: Not to rain on anyone's parade, but I think I remember the terms and abbreviations were: Microfarads (mf) as in a 0.1mf wax impregnated paper condenser Micromicrofarads (mmf) as in a 3-section 365mmf air variable condenser for the TRF receiver. As I recall, it generally was kilocycles (kc or kcs) through ten meters, and thereafter megacycles (mc or mcs) up to what is now known as 1GHz (which was called a kilomegacycle [kmcs]). Anything above a few kilomegacycles hadn't been invented yet. I have learned to begin with I think I remember, because often I really don't remember. 73 and Happy Holidays to all Fred K6DGW Auburn CA CM98lw Ron D'Eau Claire wrote: Larry, N8LP wrote: Guilty on the age charge! I also remember uufd... and what's this newfangled Hz thing? Hi Hi. That hurts too (pun intended). Ron (often found around 7,035 or 3,545 kc/s) AC7AC ___ ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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: [Elecraft] Puffing to keep up with the Nanofarads...
Date: Thu, 16 Dec 2004 17:40:39 -0800 From: Fred Jensen [EMAIL PROTECTED] Not to rain on anyone's parade, but I think I remember the terms and abbreviations were: Microfarads (mf) as in a 0.1mf wax impregnated paper condenser Actually, what you're showing as an m was a lower-case Greek Mu. m means milli, an order of magnitude different. Micromicrofarads (mmf) as in a 3-section 365mmf air variable condenser for the TRF receiver. As I recall, it generally was kilocycles (kc or kcs) through ten meters, and thereafter megacycles (mc or mcs) up to what is now known as 1GHz (which was called a kilomegacycle [kmcs]). Anything above a few kilomegacycles hadn't been invented yet. And cycles for frequency, by itself means very little. The proper term was cycles per second, which is what Hertz replaces, not just cycles I don't think Mr. Hertz used cycles since he was a scientist, and would think accuracy of expression was important, but he probably used cycles per second. 73, doug ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: [Elecraft] Puffing to keep up with the Nanofarads...
That's why it was named **after** Hertz. On Dec 16, 2004, at 6:47 PM, Kurt Cramer wrote: Mr. Hertz called them cycles !!! 73, Kurt ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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: Elecraft@mailman.qth.net 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
