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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 27th Jan 2023, 7:23 pm   #1
PA3DAF, Erwin
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Default Kokusai mechanical filter question

Hello to all,

I tried to find info about a Kokusai mechanical filter type "MF-455-12GZ". There is a lot of info about the MF-455-10GZ but nothing about the 12GZ. Who can help me?

TIA

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Old 27th Jan 2023, 7:39 pm   #2
HamishBoxer
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Default Re: Kokusai mechanical filter question

MF-455K Series Specifications Min. Band- width at 6 dB Attenuation (kHz) 2.0 3.0 Max. band- Standard Gain width at 60 dB at 4 Millimhos Working Temperature Range (QC) O to +70 O to +70 TYPE MF-455-10CK MF-455-15CK Center Max.

All I could find, they all sound a bit similar.
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Old 27th Jan 2023, 7:39 pm   #3
G6Tanuki
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Default Re: Kokusai mechanical filter question

I wonder if the "10" or "12" defines the bandwidth?
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Old 27th Jan 2023, 7:57 pm   #4
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Default Re: Kokusai mechanical filter question

On Radiomuseum 10 = 2kHz BW, and 15 = 3kHz, so I wonder if 12 is the very popular
2.7kHz BW.
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Old 28th Jan 2023, 12:08 am   #5
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Default Re: Kokusai mechanical filter question

This is as much as I have been able to find so far "12-element mechanical filter called MF-455-12GZ is also listed in the standard table" from here https://ala1530s.blogspot.com/2013/05/blog-post_22.html

It's in Japanese so you will need to translate it.
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