Mike Maghakian wrote:

I have been corresponding with a filter expert this year and here is
what he has to say:

Hi Mike,

The curves I've plotted on the LF-C6 and LF-C2A would
seem to indicate that the number in NTK filters is the bandwidth so
LF-D6 would indeed be 6 kHz filters. The 6 kHz is a minimum, however.
The LF-C6 I have plotted on my website is actually about 9 kHz wide.
The Murata CFK455I's spec'ed at 4 kHz measure about 6 for the several
I tested. So ceramic filters spec'ed at 6 kHz would probably be 8-9
kHz typical, a little too wide for DXing' although now that I've found
the spec's, perhaps useful to replace the "wide" filter in a rx with
one that's still wide, but better shape factor.

See my earlier post for links to NTK specifications.

The LF-D6 is spec'ed at 6 kHz @ -6 db and 15 kHz @ -70 db.
Interpolating, that's probably 12.6 kHz wide at -60 db, about a 2:1
shape factor. The LF-D series seems to be the the best of the
different series that NTK made.

I have an LFH-4S in my '2010'. Is that filter still available?


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