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Post by vanlifeson on Jun 7, 2024 23:19:57 GMT -5
Are there 455khz filters on the market that will work in the 201?
I have a bad one. Thanks
Or are they resonators in the hand wired 201?
Looking to get some new ones that will work.
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Post by tubefan on Jun 8, 2024 17:00:15 GMT -5
Are you talking about the yellow tubular resonators or the little black 455 block?
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Post by vanlifeson on Jun 8, 2024 23:28:32 GMT -5
Are you talking about the yellow tubular resonators or the little black 455 block? The yellow tubular resonators in the hand wired D201. |
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Post by tubefan on Jun 9, 2024 0:01:41 GMT -5
Barkett had them when I needed them but looks like he is out now. I know there is a way to convert it to use the black blocks. Have seen it. Always wondered how it's done.
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Post by 2600 on Jun 9, 2024 0:35:05 GMT -5
Two of the 3-pin black ceramic filters are what Tram used in the 40-channel radio. Used to have an instruction sheet showing how to install them in the 23-channel circuit-board radios after removing all of the 2-pin filters.
Don't think we have that for the open-chassis original version. Started to design a drop-in pc board for that radio since the original filters are all on one small pcb. And then they discontinued the tuning coil I used. Never got around to subbing another part, lost interest.
Easiest solution is to take two of the 3-pin filters and mimic the schematic and placement diagrams in the 40-channel owner's manual. A resistor's value gets changed, but I'll see if I can track down the original info that came from Maycom back in the 80s.
73
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Post by oldgeezer on Jun 9, 2024 12:40:57 GMT -5
eBay item number:155599988651 8kHz bandwidth. Five for $10.95 shipped.
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455 filter
Jun 10, 2024 19:15:49 GMT -5
via mobile
Post by tubefan on Jun 10, 2024 19:15:49 GMT -5
eBay item number:155599988651 8kHz bandwidth. Five for $10.95 shipped. And do what with them? He needs to know how to convert the yellow resonators over to 455khz filters |
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Post by 2600 on Jun 10, 2024 23:59:22 GMT -5
Workin' on it. Got busy at work today.
73
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