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

Erwin, PA3DAF

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.

Re: Kokusai mechanical filter question
 

I wonder if the "10" or "12" defines the bandwidth?

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.

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.