John, Tim and all,
Usual capacitor markings are not really hard to interpret - they are just
like resitor color codes but using numbers instead of colors. They use 3
digits - 2 significant digits followed by a multiplier. The multiplier
tells us how many zeros to add - so 470 would be a 47 pf capacitor, 471 is
470 pf, 472 is 4700 pf, etc.
The exception is that values in the range 0 to 9.9 pf are usually marked
with their actual value (and usually followed by a letter) - and values from
10 pf to 99 pf can be marked with just their value (but it will have only 2
digits, not 3). If the marking contains only one or two numbers, that
number is the capacitor value, and if it contains a decimal point, that
marking is most certainly the value.
Yes, there are several ways that capacitors can be marked, just look at the
component data section of an ARRL handbook to become familiar with the
variety, but for the most current production capacitors, the marking rules
indicated above will hold true.
73,
Don W3FPR
----- Original Message -----
From: "John R. Lonigro" <[EMAIL PROTECTED]>
Cc: "Elec-Reflector" <[email protected]>
Sent: Sunday, January 23, 2005 7:29 AM
Subject: Re: [Elecraft] K2 RF board part C72 Identity
Tim:
I am using my Rev E manual for reference. It might be slightly different
in yours. There is a 2.7 pf capacitor (C22) listed and I'm wondering if
you have identified that when you did your inventory. I suspect the blue
2.7C cap you found might be that one. Also, there is a 27 pf capacitor
(C198) which in my manual is erroneously described in the parts list as
"27" or "271", but I believe it should have said "27" or "270". The
really confusing aspect of it all is a 270 pfd capacitor should be
labelled "271", so you have the case where something marked "270" isn't a
270 pfd capacitor. I found all of this while doing inventory and made
sure I marked them unambiguously so I wouldn't get them mixed up when it
was time to install them.
Good luck and 73's,
John AA0VE
Tim Logan wrote:
I'm having trouble locating this part. Manual says it should be labeled
271. I have a small blue cap that is labeled 2.7C. Could this be C72?
Thanks for any help.
73/Tim NZ7C
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