[ICOM] Collins instead of Murata?

[Clark Savage Turner]

Just a note, watch the specs on these filters.  There is no magic in 
the Collins mechanical filters.  The Murata ceramics are as good (and 
better) in some cases.  I use the Collins 2.3 KHz filter that is 10 
poles and has a somewhat better shape factor than the Murata K14, but 
the K5 is pretty close.  The Collins mechanical filters at 8 poles are 
not the best of shape factors (I think the phase delay is different 
too, but I don't use digital modes where it might really matter.)  The 
K12 may be a "better" filter for many purposes.  I suspect it does have 
a bit more ripple depending on the match in the circuit but gives a 
pretty darned good shape factor.  Anyway, look at specs such as shape 
factor and ultimate rejection (and price?  hi hi)  I use filters from 
Murata and from Collins in different applications.

Clark
WA3JPG

On Apr 12, 2005, at 3:20 PM, Tim Kass wrote:
>
> I would be interested in what mod you did to the Murata filter, 
> replaced it?  Thanks