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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? -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 80,000 Newsgroups - 16 Different Servers! =----- |
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