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K2 RF Capacitor ID

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K2 RF Capacitor ID

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?

Thanks,
--ae0mm
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Don Wilhelm

Re: K2 RF Capacitor ID

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?
>

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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
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Elecraft mailing list

Re: K2 RF Capacitor ID

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 <[hidden email]> 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?

Don Wilhelm

Re: K2 RF Capacitor ID

All small value monolythic capacitors supplied by Elecraft are C0G and
the small value disc ceramics are NP0 whether or not they have a black top.

73,
Don W3FPR

On 7/20/2018 2:04 PM, AE0MM wrote:

> 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 <[hidden email]> 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?
>
>