The AM Forum
December 06, 2024, 05:33:28 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: What is uuF capacitance?  (Read 4652 times)
0 Members and 1 Guest are viewing this topic.
n8fvj
Member

Offline Offline

Posts: 272


« on: October 31, 2023, 01:25:45 AM »

Anyone have a uuf to pf conversion? I cannot find uuF anywhere on the internet.
Logged
W1RKW
Contributing
Member
*
Offline Offline

Posts: 4423



« Reply #1 on: October 31, 2023, 05:42:41 AM »

uuf = pf
10-6 x 10-6 = 10-6+-6 = 10-12
Logged

Bob
W1RKW
Home of GORT.
wa2tak
Member

Offline Offline

Posts: 110


« Reply #2 on: October 31, 2023, 09:15:27 AM »

Google "picofarad to microfarad CALCULATOR"
Logged
KD1SH
Member

Offline Offline

Posts: 883



« Reply #3 on: October 31, 2023, 09:29:47 AM »

It always annoyed me that "m" has been traditionally used to denote "micro", where by rights it should denote "milli". English speakers confuse the Greek "milli" for "millionth", although it actually means "thousandth". The proper Greek "millionth" is, of course, "u" or "micro", hence one microfarad is one millionth of a millionth of a Farad. If the correct Greek notation were used, one "mmf" would be one microfarad—a thousandth of a thousandth of a Farad—not a picofarad as commonly used.




* MicroFarads.jpg (52.83 KB, 1000x750 - viewed 125 times.)
Logged

"Gosh, Batman, I never knew there were no punctuation marks in alphabet soup!"
—Robin, in the 1960's Batman TV series.
N1BCG
Member

Offline Offline

Posts: 831


« Reply #4 on: October 31, 2023, 09:49:47 AM »

If the correct Greek notation were used, one "mmf" would be one microfarad—a thousandth of a thousandth of a Farad—not a picofarad as commonly used.

365 mmfd variable caps from Radio Shack. Loved those...



* mmfd.jpg (123.77 KB, 503x402 - viewed 141 times.)
Logged
KD1SH
Member

Offline Offline

Posts: 883



« Reply #5 on: October 31, 2023, 09:54:39 AM »

All caps—MegaMegaFarad—now that's a bread-slicer!
Logged

"Gosh, Batman, I never knew there were no punctuation marks in alphabet soup!"
—Robin, in the 1960's Batman TV series.
n8fvj
Member

Offline Offline

Posts: 272


« Reply #6 on: October 31, 2023, 09:56:57 AM »

What is 225uuf to pF?
Logged
W3SLK
Member

Offline Offline

Posts: 2692

Just another member member.


« Reply #7 on: October 31, 2023, 10:04:15 AM »

You know, W1RKW pointed it out for you!
Quote
uuf = pf
10-6 x 10-6 = 10-6+-6 = 10-12

225uuf = 225 pf
Logged

Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
Pete, WA2CWA
Moderator
Member

Offline Offline

Posts: 8145


CQ CQ CONTEST


WWW
« Reply #8 on: October 31, 2023, 01:29:01 PM »

BUT WAIT, WE ALSO HAVE "nf"
And Goggle is your friend:

Capacitor Conversion Chart - Click the moving capacitor - it's a Bumble Bee


AND for those that need more then one source for conversion charts, Google really is your friend:
Just GOOGLE   capacitor conversion chart
Logged

Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
KA3EKH
Member

Offline Offline

Posts: 804



WWW
« Reply #9 on: October 31, 2023, 03:28:54 PM »

yeah, but what about disk ceramic where they have things like 103 that's really a 0.001, I think. By the way I am afraid to click on the capacitor because it may sting! back when I was in tech school we use to charge up 20 and 40 uf/mfd? 450 volt capacitors at our bench and toss them at each other.
Logged
W1RKW
Contributing
Member
*
Offline Offline

Posts: 4423



« Reply #10 on: October 31, 2023, 03:58:53 PM »

on my capacitance meter I get tripped up on the 3 nf (10-9) ranges it has.  I then have to think about what direction to move the decimal point 3 places to get either uF or pF.
Logged

Bob
W1RKW
Home of GORT.
n8fvj
Member

Offline Offline

Posts: 272


« Reply #11 on: November 01, 2023, 05:27:28 AM »

I get it. uuF is same as pF.
Logged
KC2ZFA
Member

Offline Offline

Posts: 440



« Reply #12 on: November 01, 2023, 09:02:44 AM »

they wrote u for μ because it was hard to change
fonts in print. It hasn’t been hard to change fonts
for the 40 years by now that electronic typesetting
has been around but the u for μ stuck.

μ for micro (μικρό), a millionth.
Logged
W3SLK
Member

Offline Offline

Posts: 2692

Just another member member.


« Reply #13 on: November 01, 2023, 10:15:52 AM »

Don't forget about the M in the old Collins rigs where it says in the schematic:



* Note.png (232.36 KB, 1397x588 - viewed 154 times.)
Logged

Mike(y)/W3SLK
Invisible airwaves crackle with life, bright antenna bristle with the energy. Emotional feedback, on timeless wavelength, bearing a gift beyond lights, almost free.... Spirit of Radio/Rush
N1BCG
Member

Offline Offline

Posts: 831


« Reply #14 on: November 01, 2023, 10:17:41 AM »

yeah, but what about disk ceramic where they have things like 103 that's really a 0.001, I think.

"103" is 0.01uF

This website has both a capacitance converter and chart for quick reference:

https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-capacitance

Logged
Tom WA3KLR
Contributing
Member
*
Offline Offline

Posts: 2129



« Reply #15 on: November 01, 2023, 01:19:29 PM »

The World War Two era hams called uuF = "mickey mikes".
Today we say "puffs" for pF.
The computer/simulations/digital meters era bought in the use of nanofarads.
Logged

73 de Tom WA3KLR  AMI # 77   Amplitude Modulation - a force Now and for the Future!
KB2WIG
Contributing
Member
*
Offline Offline

Posts: 4468



« Reply #16 on: November 01, 2023, 06:13:09 PM »



Mickey Mikes still around in the early 70's.  Bought some!

klc
Logged

What? Me worry?
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.044 seconds with 19 queries.