General > General Technical Chat
What's this please? (Component Advice)
TheBay:
--- Quote from: gamalot on November 26, 2021, 10:46:00 am ---
--- Quote from: TheBay on November 26, 2021, 09:59:28 am ---
--- Quote from: lowimpedance on November 26, 2021, 02:23:21 am ---
--- Quote from: TheBay on November 25, 2021, 08:38:08 pm ---Can anyone identify the manufacturer's logo on this ceramic filter please :)
--- End quote ---
The only reference I can find is to an ebay store based in China, and they brand it as 'CD' :-//, but also give a complete part number LTM50EW as well as other ones with similar P/N's or state the actual frequency.
ie LTM55EW represents a 455kHz filter, the M50EW is a 450kHz filter etc. All similar footprint and probably copies of muRata parts etc.
--- End quote ---
Cheers for the reply, I need 450kHz and 455kHz in different bandwidths, the LTM's are just generics so I avoid those.
muRata do manufacture these parts but I cannot find anywhere that actually sells them and muRata will not respond to any requests I've sent them directly.
TOKO originally manufactured these parts but they had a manufacturing issue and as such nearly all of them are faulty, muRata took over TOKO.
I come across this issue quite often and have to replace 4 different types of these ceramic filters on certain transceivers, others take 2 or 3.
But the only type I have found that seem to be reliable and were available are the ones with the "CD" logo, but I really need to know who they are so I can order more, I was getting these from Kenwood and Yaesu directly but they have run out of stock.
Interestingly the last batch I had that came from Kenwood were TOKO so had been in Kenwoods parts storage for some time as these haven't been manufactured for years. When they arrived the legs were black and you could clearly see the hygroscopic contamination/migration had already taken place which really adds little weight to the DC blocking argument.
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If you know how to buy from Taobao in China, I found a seller for you:
https://item.taobao.com/item.htm?spm=a230r.1.14.7.202f768dAyGRf3&id=18805169867&ns=1&abbucket=5#detail
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Many thanks for the link, that is really helpful.
I just hope that is actually what they ship, not the "LTM" generics.
tsmith35:
--- Quote from: TheBay on November 25, 2021, 08:38:08 pm ---Can anyone identify the manufacturer's logo on this ceramic filter please :)
--- End quote ---
I found these on eBay... $16.80 for 20 pcs from China. https://www.ebay.com/itm/203180089011
Also on Aliexpress at $11.99 for 10 pcs. https://www.aliexpress.com/item/1005002674796712.html
HTH
TheBay:
--- Quote from: tsmith35 on November 26, 2021, 01:33:38 pm ---
--- Quote from: TheBay on November 25, 2021, 08:38:08 pm ---Can anyone identify the manufacturer's logo on this ceramic filter please :)
--- End quote ---
I found these on eBay... $16.80 for 20 pcs from China. https://www.ebay.com/itm/203180089011
Also on Aliexpress at $11.99 for 10 pcs. https://www.aliexpress.com/item/1005002674796712.html
HTH
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Cheers, I had spotted them on Aliexpress, the trouble is it's not that specific model I need there are many different types and I can't always get all of them, some are easier than others. That's why I wanted to find out what the "CD" logo stood for to broaden my search.
M55GW and M50GT seem to be the more difficult parts to find.
tsmith35:
--- Quote from: TheBay on November 26, 2021, 02:20:48 pm ---Cheers, I had spotted them on Aliexpress, the trouble is it's not that specific model I need there are many different types and I can't always get all of them, some are easier than others. That's why I wanted to find out what the "CD" logo stood for to broaden my search.
M55GW and M50GT seem to be the more difficult parts to find.
--- End quote ---
So I found some interesting stuff. Not sure if it's helpful, but maybe.
https://www.hesta.pl/en/ceramic-filters/602-amfm-murata-ceramic-filters-kit-for-kenwood-tm-v71.html
https://www.murata.com/~/media/webrenewal/support/library/catalog/products/filter/cerafil/p05e.ashx
https://www.murata.com/~/media/webrenewal/support/library/catalog/products/filter/cerafil/p50e.ashx
https://www.murata.com/en-global/products/filter/cerafil/support/eol
https://www.hesta.pl/en/72-ceramic-filters
TheBay:
--- Quote from: tsmith35 on November 27, 2021, 06:18:32 am ---
--- Quote from: TheBay on November 26, 2021, 02:20:48 pm ---Cheers, I had spotted them on Aliexpress, the trouble is it's not that specific model I need there are many different types and I can't always get all of them, some are easier than others. That's why I wanted to find out what the "CD" logo stood for to broaden my search.
M55GW and M50GT seem to be the more difficult parts to find.
--- End quote ---
So I found some interesting stuff. Not sure if it's helpful, but maybe.
https://www.hesta.pl/en/ceramic-filters/602-amfm-murata-ceramic-filters-kit-for-kenwood-tm-v71.html
https://www.murata.com/~/media/webrenewal/support/library/catalog/products/filter/cerafil/p05e.ashx
https://www.murata.com/~/media/webrenewal/support/library/catalog/products/filter/cerafil/p50e.ashx
https://www.murata.com/en-global/products/filter/cerafil/support/eol
https://www.hesta.pl/en/72-ceramic-filters
--- End quote ---
Thank's for the muRata datasheets, there are some full part numbers in those which help me with my search. But so far everything has come back with Obsolute.
I came across that Polish Hesta site a few months back, I got my friend in Poland to communicate with them and they said they do not actually have stock, those pages are just there as placeholders or for Google to find their site :palm:
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