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I.F. ceramic filters

O

OKCRadioGuy

Where's a good source for either the Toko or Murata 110k ceramic 10.7 IF filters? (It seems that Digi-Key only has the 150s in massive quanties) My plan is the put a 150 in the first slot and a 110 in the second in my old Yamaha CT-610 II. Is this a good plan if I can get the parts? Will it work OK with both of them being 150s?Thanks for the info!
 
Found this: ( http://www.fmtunerinfo.com/filters.html )I have used Mouser many times. Great outfit..News flash 3/05: Murata ceramic filters are now available from Mouser with no minimum order. The part number for low-loss 150 kHz filters is SFELA10M7JAA0-B0, and they are $0.68 apiece or $0.59 each for ten or more. The 150s are in stock as of today, and the 230 kHz filters (SFELA10M7GAA0-B0) are listed but "non-stocked." The 180 kHz and 280 kHz filters from this line are not listed, but other Muratas may be.Muratas can also be obtained, even more inexpensively, from Digi-Key, which used to carry only Toko filters. The low-loss 150s are only $0.59 apiece, $4.91 for 10 or $21.16 for 50, and even cheaper for larger quantities. That's the only low-loss Murata that Digi-Key carries, but we haven't checked whether they carry other types.But here's our contributor Brian B. with one caveat for anyone who buys filters and installs them without measuring and matching them: "Last year I ordered 100 150s from Digi-Key. I was expecting parts in a more or less normal (bell-shaped) distribution around 10.700 MHz. I was really disappointed. Most of the parts were at 10.720 to 10.730, with others below 10.800. I found only one near 10.700, as I recall. The batch was essentially useless to me since I needed to match wide filters pretty well centered at 10.700 MHz. I'm sure the batch had been cherry-picked before I got my hands on it, probably even before Digi-Key did. Ten 230s I got at the same time were much better, all useful."Other Murata filters are available from other distributors. One possible contact is:
 
My batch of 100 150 kHz filters from Digikey was well distributed around a center frequency of about 10.715 There were very few outside of that range. I would suspect the test methods of the other poster, because Murata's numbering / dot scheme would have automatically put the filters he described into different categories (different color dots). I suspect Murata's screening process is automatic, and tests thousands of filters per hour. My tests were done with correct impedances on a $30,000 Agilent network analyzer - so I have high confidence. My tests using the same setup match the results on some Toko samples which came with documentation.
 
Thanks guys! I've got some 110s and 150s, and even a few 180s on the way now.. I'll socket them so I can experiment with it a bit. This will be fun! ;D
 
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