[Elecraft] K2 RF Capacitor ID

[AE0MM]

Thanks, Don. Looked back at my neatly bagged inventory and found the bag I marked "271". That's what I get for trying to be organized.

Here's what I'll use:
C72: "271"
C45: "010" (although it doesn't have a black cap to indicate "temperature stable")
C33: "229"
C198: "270"




​--ae0mm​

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On July 20, 2018 12:44 PM, Don Wilhelm <donwilh at embarqmail.com> wrote:

> ​​
> 
> Those capacitors are using the standard 3 digit code - two significant
> 
> digits followed by a multiplier (9 is used for a multiplier of 0.1 in
> 
> this type of identification).
> 
> 010 is 1pF
> 
> 030 is 3pF
> 
> 270 is 27pF
> 
> 229 is 2.2pF
> 
> I don't know where your 270pF (marked 271) capacitor may be, you didn't
> 
> list it.
> 
> With manufacturers discontinuing many thru-hole components, it is
> 
> getting more and more difficult to keep the manuals current with the
> 
> available supply.
> 
> 73,
> 
> Don W3FPR
> 
> On 7/20/2018 12:10 PM, AE0MM via Elecraft wrote:
> 
> > I'm having trouble identifying a few capacitors used in the assembly of the K2 RF board.
> > 
> > C72: "271"
> > 
> > C45: NPO "1", black top
> > 
> > C33: 2.2pf "2R2" or "2"
> > 
> > C198: NPO "27" or "272"
> > 
> > What I have:
> > 
> > a blue "010"
> > 
> > a blue "030"
> > 
> > a yellow "270"
> > 
> > a yellow "229"
> > 
> > I suspect the "229" is a 2.2pf capacitor for C33.
> > 
> > The "270" could be 27 or 270pf, but I'm not sure; it might be for C72.
> > 
> > The "010" could be the 1pf for C45, but it doesn't have a black top.
> > 
> > Could the "030" be for C198? This suggests it could be: http://www.elecraft.com/Apps/caps.htm
> > 
> > I'm having trouble measuring capacitance for these tiny capacitors. Values are all over the place. Any suggestions for verifying the values and positively IDing them?