tag:blogger.com,1999:blog-7590176649168185428.post7924218527653130226..comments2024-03-28T08:01:27.111-04:00Comments on SolderSmoke Daily News: The meaning of "CM" in the Toyo CM-455 Filter Bill Mearahttp://www.blogger.com/profile/07662500663603350847noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-7590176649168185428.post-15676414237906092482016-11-15T03:07:59.260-05:002016-11-15T03:07:59.260-05:00Hey, that photograph looks familiar!
I recently s...Hey, that photograph looks familiar!<br /><br />I recently started listening to Soldersmoke from the beginning on through. As you talk about things I look it up on the blog, read the other articles around the same time.<br /><br />Hoping to catch up with you before 2017.wrmhttps://www.blogger.com/profile/18103158605402636540noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-78479736044120022082016-04-07T18:24:38.389-04:002016-04-07T18:24:38.389-04:00You could try making a mechanical filter. Someone...You could try making a mechanical filter. Someone, I think an ON5, had a construction article about 1964 or 65 for a receiver, I think solid state. I think it was in CQ. And incidentally he gave instructions on making a mechanical filter. I have no ide if enough detail was provided, or how easy it would be to make one.<br /><br />If 455KHz crystals have dried up, try making a ladder filter with 455KHz ceramic resonators. Or, I suspect not enough has been done with ceramic filters.<br /><br />Of course at this point, 455KHz IFs are old history. Not only are higher frequency filters available, but you get away from having to fuss with image rejection. "Simple" receivers still may use 455KHz IFs, yet then have to fuss about tracking the RF stage with the local oscillator. "Complicating" by going to a higher IF may simplify overall, which is what design is about.<br /><br />MichaelMichaelhttps://www.blogger.com/profile/13699701261288661640noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-24017363768264537122016-04-07T12:11:51.355-04:002016-04-07T12:11:51.355-04:00This comment has been removed by the author.Chip V.https://www.blogger.com/profile/11737481197033996679noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-43167105063365254512016-04-07T12:11:40.009-04:002016-04-07T12:11:40.009-04:00Unfortunately I have no specs for your particular ...Unfortunately I have no specs for your particular filters. However, if you visit www.kiwa.com , you can see some typical 455 KHz crystal filters with curves.Chip V.https://www.blogger.com/profile/11737481197033996679noreply@blogger.com