Timeline for RF Common-Mode Filter Topology
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 1, 2017 at 0:45 | comment | added | D.A.S. | One takes the longest cable used and terminates the impedance at both ends as correctly as possible into a spectrum analyzer or scope. Cable quality varies widely and ground connections matter too. I once used a spectrum analyzer on CATV signals near a train passing and measured significant interference, mostly due to poor grounds on coax. This is a CM noise converted to differential due to impedance imbalance. | |
| Dec 1, 2017 at 0:32 | comment | added | User7251 | rejection would be required. | |
| Dec 1, 2017 at 0:31 | comment | added | User7251 | Actually the choke I was planning on using is here: product.tdk.com/info/en/catalog/datasheets/…, the 220. I mentioned above that L1&L2 are actually one CM choke, hopefully that was clear. I'm not working to any spec, and I don't have any numbers so I was just trying to get rejection as low as possible in that range, not very precise, I know. Input/output is line-level audio and this setup will be used near an FM transmitter, I could go to the location where it will be used and do some testing, but not exactly sure how to determine what CM ... | |
| Nov 30, 2017 at 23:49 | history | answered | D.A.S. | CC BY-SA 3.0 |