File:Collins mechanical filters.jpg
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Summary
| Description |
English: A pair of mechanical filters from a Collins 75A-4 amateur radio receiver. Left: F 455-J-05 with 500 Hz bandwidth for CW (Continuous Wave / Morse code) transmissions. Right: F455-J-31 with 3,100 Hz bandwidth for AM (Amplitude Modulated) or SSB (Single Side Band) voice transmissions. Circa 1950s or later. |
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| Author |
Michael L. Umbricht /
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:04, 4 March 2025 | | 4,032 × 3,024 (6.82 MB) | wikimediacommons>Mu301 | Uploaded own work with UploadWizard |
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