[Amps] Blue Disc Ceramic caps ??

[Rob Atkinson]

it turned out the blue ones in question were class SL.  those caps are
equivalent to Class 1 caps and are considered okay for low
power applications such as blocking in VFOs and receivers (if you can
believe what you find on the internet).

Rob
K5UJ

On Fri, Aug 17, 2012 at 9:16 AM, Carl <km1h at jeremy.mv.com> wrote:
> Most of the blue ones Ive seen are Chinese and many reports are they fail at
> RF...at least at QRO.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- From: "Rob Atkinson" <ranchorobbo at gmail.com>
> To: "Larry Benko" <xxw0qe at comcast.net>
> Cc: <amps at contesting.com>
> Sent: Friday, August 17, 2012 6:25 AM
> Subject: Re: [Amps] Blue Disc Ceramic caps ??
>
>
>> v. rating is only part of it; I think Hank is probably wanting to know
>> if they are class 2 and what the dielectric temp. code is.   Choose
>> caps for RF carefully.
>>
>>
>> rob
>> k5uj
>>
>> On Thu, Aug 16, 2012 at 11:01 PM, Larry Benko <xxw0qe at comcast.net> wrote:
>>>
>>> Hank,
>>>
>>> Look at TDK CC45 capacitors.  Available at Mouser with number
>>> 810-CC45xxxxxxxx.  They are about $.15 in 1k quantities.  The data sheet
>>> specifically says "low dissipation at high frequency".  They are rate at
>>> 6kVDC.  I have tried*unsuccessfully* to blow them up at HF with no DC
>>> and RF voltages of 2kVpk.  However the ones I was testing were 10pF,
>>> 22pF, and 47pF so the current would be much lower than the higher
>>> capacitance ones.
>>>
>>> Larry, W0QE