FW: Puffing to keep up with the Nanofarads...

[Dan Barker]

Hertz's is kinda like cycles. When you hear 4 MHz, think 4000 KCS.

Dan / WG4S / K2 #2456

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of Larry Phipps
Sent: Thursday, December 16, 2004 1:49 PM
Cc: '[hidden email]'
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
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[Kurt Cramer]

Mr. Hertz called them cycles !!!

73, Kurt                        

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[David A. Belsley]

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
>
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[G3VVT]

 
In a message dated 16/12/04 18:44:22 GMT Standard Time,  
[hidden email] writes:

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.
------------------------



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
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[N8LP]

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
>  
>

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