|
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. |
|
Thread Tools |
27th Jan 2023, 7:23 pm | #1 |
Diode
Join Date: Mar 2022
Location: Huissen, The Netherlands
Posts: 9
|
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 |
27th Jan 2023, 7:39 pm | #2 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,923
|
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.
__________________
G8JET BVWS Archivist and Member V.M.A.R.S Last edited by HamishBoxer; 27th Jan 2023 at 7:44 pm. |
27th Jan 2023, 7:39 pm | #3 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,952
|
Re: Kokusai mechanical filter question
I wonder if the "10" or "12" defines the bandwidth?
__________________
I'm the Operator of my Pocket Calculator. -Kraftwerk. |
27th Jan 2023, 7:57 pm | #4 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
|
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. |
28th Jan 2023, 12:08 am | #5 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,324
|
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. |