[600MRG] WIMA capacitors

[J Mcvey]

Ceramics ought to work well, no?Have you tried any of them?
There are COG and 5% types ...
 

    On Friday, January 5, 2018 8:49 AM, Larry <larry at w7iuv.com> wrote:
 

 Recently I had the opportunity to look close at some caps for 475/137 
filter use.

I measured the Q at the approximate operating frequency.

The best is silver mica caps. Expensive but usually worth it for 
critical applications. Unfortunately not usually available in the values 
needed for 137.

Next best is the 715P "orange drops", expensive and sometimes hard to get.

Third on my list is the WIMA MKP1 series. Seems to be OK in all my 
applications so far and is affordable.

I have had bad luck using the FKP1 series caps. The ones I looked at had 
higher ESR, lower Q and got hot in my filters.

Kemet and other vendors didn't seem to be much good, at least the types 
I had access to.

YMMV....

73,

Larry - W7IUV



On 04-Jan-18 10:32 AM, lstoskopf at cox.net lstoskopf at cox.net wrote:
> Take a look at the graphs for the WIMA FKP1 series.  At 472 kHz they seem to fall off pretty fast.  I'm in the same boat....have some picked up here and there, but haven't used them so anxious to see what the big boys say.  N0UU
>>
>> So I went looking for alternatives. The WIMA FKP1 series is readily
>> available in the proper values and voltage ratings, but I am not
>> sure they can be successfully substituted in this application. Also
>> they are not available in any tighter tolerance than 5%.
>>
> 
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