[600MRG] WIMA capacitors

Thu Jan 4 12:57:05 CST 2018

http://www.wimausa.com/EN/pulseselection.htm

Looks grim.  Maybe I'm wrong, but need a pro to explain this.  N0UU

> 
>     On January 4, 2018 at 1:50 PM 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
> 
>       http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
> 