The list with a lot of 455 kHz filter measuring results in PDF's. Most of them are used somewhere in the NRD-515 or in some of my designs. First a number of (former) manufacturers logos and links (if active):

PDF clicker	Some information and description of universal standard materials
	INRAD-COLLINS number #720 This is a test of a replacement SSB filter from INRAD - Collins for (a.o.) the Yaesu Rx-Tx FT897D. Here I am shocked about, this is almost a pornographic picture with the most ideal design shape. Very flat top, very good shape-form, very good stopband suppression!! Jeez, is this possible now nowadays? Costs as much as the most expensive ceramic filter types which canNOT match/compete with it! Measured in the open construction version-3, the real bottom can be 5 to 10 dB lower.
	CFU455I, CFU455IT, a NBFM and a scrap filter. Compare this with the previous (INRAD). These are the cheapest 3-legs standard filters, used in consumer radio's. Also a wide 15 kHz NBFM version in this set. Not the yellow blocks with several glued together, that's even worse ... Still complete shit, I had to pay for it? I don't want them now even for free .... A complete joke... Stopband suppression?? What's that??
V2	After building the V2 update (4th version of the measuring module, with much stronger internal shielding) and a 20dB higher level, measuring a control measurement with low dB depth of a simple 3-leg filter, CFU455I. Does it look exactly like the CFU455I from above? Yes, it does, so that's OK.
	Here the most simple SFT455B types - the multi element yellow blocks with several glued together For a bit laugh.... pure shit. Note the frequency scale in the graphs
	CFM455H This filter is a fairly broad style AM filter, for Class AM sound, but not really ideal for DX.
	SFR455H the yellow CFW / CFR compatible cubes from former Kent Electronics (NL)(RIP) and the same (but more expensive) was also availabe at Barend Hendriksen (NL). Both have now stopped with the electronics trade. Not too expensive overall for simple applications with 6 to 7 kHz width, good stopband suppression. MUCH and much better than the yellow blocks with several glued together. Not very narrow, but still quite good for the low price. Two selected ones in series is similar to a filter of around 50 euros or more! See for yourself in the PDF.
	Compare test TOKO_A55H - CFR455I - CFW455HT types
	Compare and duo test many versions CFW455IT from Murata
	Compare and duo test many versions CFW455IT from Murata, an extended version of the previous one. So many curves that they could make you dizzy!
	test (2x) of the narrow Murata type CFW455KI
	A collection of tests: CFW455IT single and as duo (cascaded) As duo for a small price a filterclass which is at least 5x more expensive!
	KENWOOD YG-455C-1 en YG-455CN-1, 500 and 250Hz real CW crystal blocks from the NDK factory
	KOKUSAI SSB filter MF-455-11GZ made for ICOM. Original. This is the standard measurement with the V1 module, an early measurement with relatively open structure between IN and OUT (but well covered!), So a "decent" HF leak around the filter. And yet it measures still fine in comparison with the ceramic Murata's.
V2	KOKUSAI SSB filter MF-455-11GZ made for ICOM. Same as above. No sticky foam, but silicone elastomer, see picture. Filter just had a bath and still naked?? © by PE1ABR This is the measurement with the V2 upgrade module with more internal shielding. This still 20 dB deeper measure, and the filter floor goes down with it!
V2	Narrow Murata quality filter test with 2x the CFW455IT in cascade, tested in module V2. No ripple compensation is required. There is no standard quality AM "6 kHz" filter to compete with. Compare this with what is standard in the NRD-515: same bandwidth (just above 6 kHz), significantly better shape factor, at least 40 dB better stopband suppression and a bit more damping, ie 1.5 dB more. Ideal for an additional roofing filter in front of the first 455 kHz stage (in position C170).
V2	One more time a test with module V2 with 2 filters in cascade from the type SFR455H, compatible with CFW455H. These yellow cubes come from KENT Electronics. You get easily the -100 dB floor without even a single pendulum in parasitic suppression area. Unfortunately, the passage had a small ripple. Which tricks are needed to reduce or to minimize the increased ripple? Tests with an increased terminate-Z of 2K7 instead of 2K0 = best option. Possibly an extra T-terminator in between of a few dB = reasonably OK (also done by INRAD / Collins!). Nothing extra in between is also usable. Also tested with a single intermediate 2K0-R or -C of 180pF (= 2K0 ) or a series Z-C of 180 pF (= also 2K!) The latter gives just extreme wrinkles.
PDF has info in Dutch	filter: PYE 455 kHz dump LC-filter. type No. : 7V455L and AT10752/2, internal AT26804 is used. Turns out to be a 7-pole potcore LC IF-filter for narrowband FM application, width 15 to 17 kHz. In the PDF testinfo: XLS measurement data, curves and a circuit diagram. Hermetically sealed, no after-alignment is possible. Coils are only accessible by a hacksaw or gas burner = both destructive! 5x low impedance links with 600 pF C between "foot"-taps and 1x top link with 13 pF. 7x parallel C of also 600 pF. Purchased from KENT Electronics in Hoek, Netherlands. Tested with a (guessed) IN / OUT-Z of 600 ohms. Tested three randomly selected copies, their 60/6 shape between 2.5 and more than 3, depending on the tuning.

PDF clicker	Specific first tests with a dual mixer unit (2x SBL-3) with 455 kHz from and to 10.7 MHz in development!
	A first test with a 10M15A crystal roofing filter, made with the dual mixer unit in open dead beetle technology. IT WORKS! Many spurious peaks! Other amateurs found those peaks too!
	Another test with a 10M15A crystal roofing filter with the 455 kHz measuring gear, other manufacturer. Here too many spurious peaks, only the brand FOX dares to show this in their datasheets. So it is correct!
	Quite large 10.7 MHz xtal filter block from an ITT mobile radio. Two versions that are quite similar. A very erratic passage.

PDF clicker	Very special tests with material for/from/or used in the JRC NRD-515
	A NRD-515 filter plugin-board (PETER) with: YF455DPB and KOKUSAI, update version after second foam change
	A NRD-515 filter plugin-board (PETER) with: YF455DPB and KOKUSAI, earlier version
	A NRD-515 filter plugin-board (PETER) with: YF455EBF and KOKUSAI
	A NRD-515 filter plugin-board (WALTER) with: Kenwood YG-455CN-1 (250 Hz) and KOKUSAI, 2nd modified cleaning with other type of foam
	KOKUSAI - KOKUSAI - 3x_separate - termination Z = 500 (default) / 1000/1500 Ohm - is a different Z maybe better? NO! From plug-in PCB from flash wg515 Normal termination = 500 ohms (via 2:1 transformers to 1000 Ohms !!), here also a test with 1000 and 1500 Ohms directly. That is everything WITHOUT those transformers. The foot is indeed better / deeper, but unfortunately the passband with much more ripple and loss, so worse .... Again with this KOKUSAI filter a set of false dips (spurious) at 336 kHz.
	A filter plugin-board from the flash NRD-515 (WG) with: NDK-YF455DPB en KOKUSAI
	After temporarily removing a few switch D's on the motherboard: the NRD-515 filters CLF-D6S (6 kHz AM) and MF-455-10AZ121 (2,2 kHz SSB), from the flash NRD-515 (WG)
	After temporarily removing a few switch D's on the motherboard: the NRD-515 filters CLF-D6S (6 kHz AM) and MF-455-10AZ121 (2,2 kHz SSB), standard NRD-515 (WG)
	Once again as above, but after a modification with a huge effect. Only the NRD-515 filter CLF-D6S (6 kHz AM), from the flash NRD-515 (WG) in the PDF. Open that one next to it to check. After all the filter measuring for a year, I found a JRC design flaw. Present in ALL JRC devices with an AM filter and an LC Z-adjustment. The LC circuit before and after the filter to adjust the Z, leaks heavily over the filter. By using 2x a "shielded" L, that is a toroid instead of an open L-rod, and also mounted rotated another 90 degrees to each other, suddenly the far suppression is 20 to 30 dB BETTER!!! I used 2x a toroid with a low AL value, chosen is 4A11 - 13 mm (TN13/7.5/5), average AL = 360. Windings number is 31, 32 or 33 (measure!) for the needed 330 uH. With higher AL value the losses are higher and you have a greater L step per winding. Lower is better and more accurate. Many old FT50-43 are of POOR quality, much higher loss. See NRD-515 page. Amidon - Fair-Rite FT50-43 were unavailable at that moment. Ferroxcube 4A11 is comparable with good FT50-43, old color = pink.

PDF clicker	For those who want older ceramic filter datasheets which are less easy to find
	Page 55 en 56 from the CERAFIL_Murata_communication__P05E from 1993
	An optimised scan of my own, from the P05E-5 CERAFIL guide from Murata from 1994, only scanned filters with "lugs/pins". NO SMD added, it was labor enough already ....
	The extract from a Murata collection book, can also be found in the CERAFIL_Murata_communication__P05E-8 A lot of badly scanned sheets are available on the web from this booklet, my sheets are perfect.
	An old, but complete version CERAFIL_Murata_communication__P05E-9 The old types used by radio amateurs are almost all missing....
	An old, but complete version CERAFIL_Murata_FM_receivers__P61E5 The old types 10.7 MHz FM_receiver filters, this version is better readable than later versions...
	OK, OK, also the latest version CERAFIL_Murata_FM_receivers__P61e7 The old type numbers 10.7 MHz FM_receiver filters are NOT in it anymore..
	And this is probably the latest version CERAFIL_Murata_communication__P05E-16 The Murata's types available via AliExpress are in it.
	No, I found a more recent one, probably this CG01-I is the last one with 455 kHz filters. Pieces of CG01-J can also be found on the web.
	A single sheet from the CG01-J, with only the bigger high quality blocks in metal. These are the 9, 11 or 15 section filters.
	Two manufacturers of similar simple ceramic filters with multiple sections, so reasonable suppression. The entire "standard" LT455 series from the companies AURIS and TOKEN. Two in a row (in cascade) gives excellent results.
	An old one from Kyocera-AVX with KBF-455-RS and KBF-455-PS info
	An old one in color from Kyocera-AVX with KBF-455-RL and KBF-455-PL info
	An older version from Kyocera-AVX with KBF-455-RL and KBF-455-PL info
	An PDF set from TOKO-RCL, the LFYM455 and LFY455
	A more complete PDF set from TOKO-RCL, lots of AM ladder filters This file is partly in English, it also needs a Japanese font.
	And a PDF set from AEL LTU455, too mediocre stop band attenuation AEL filters probably made by Zhejiang Jiakang Electronics Co., Ltd., see their logo on the latest versions.
	A PDF set from EURO-QUARZ, the LTW33-455 This LTW range has about 50 dB stop band attenuation. Conrad should have them.
	A PDF set from EURO-QUARZ, the LTU33-455 This LTU range has about 35 dB stop band attenuation. If you can find the LTW series, DO NOT use this LTU type, it is too mediocre.
	And a very old PDF set, info from NTK (C)LF-HxxS a.o. filters, incomplete. Only the versions with the "H" in the serial number. CLF-D6S is in the NRD-515, but is NOT in the PDF. Keep in mind +/- 3 kHz means 6 kHz in total!
	A messy TXT list with ONLY 10.7 MHz FM filter collection information from the web and the junk box. Still, handy together!

Walter Geeraert PE1ABR

 

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The IF-filter table list Compilation by Walter - PE1ABR - 2024-10-26