propfarmer Posted June 25, 2022 Share Posted June 25, 2022 I have a 10 amp noise filter (capacitor?) in my power cabling to the intercom/radio. It started to play up (intermittent power supply through it) and needs replacing. It has 4 wires, Red/Black wires in and Orange/Black wires out. Red/Orange is the Positive and Blacks are the Negative. The only noise filters I'm able to find on the inter web only have three wires, 2 pos and one earth? Can anyone help me with what type of noise filter I need to get to replace my exisiting one? Can't seem to find one similar anywhere? Or can i fit these other types into the existing wiring? Thanks in advance David Link to comment Share on other sites More sharing options...
RFguy Posted June 25, 2022 Share Posted June 25, 2022 So, this is a filter , most likely called a common mode choke, which will have inductors in it, and make also, for a good measure, have capacitors. Given that the earth is not only by the power cable , but by other aircraft connections, and likely by aircraft skin via the coax if it is a metal skin, depending on the nature of the noise, the 3 wire type is likely just fine. I would suggest a three wire type to start with. . for a VHF radio and intercom, a 2A continuous filter will be fine. WAGNER components (WES) have a good range online https://www.wagneronline.com.au/voltage-noise-filters/connectors-power/connectors-and-microphones/communication-accessories/11274/fl/ order code : NS15S, NS12R , they will all work for you. chose which one is most easy to mount. the NS15S (boxy one) will provide slightly better noise reduction compared to the cylindrical one. 1 Link to comment Share on other sites More sharing options...
propfarmer Posted June 26, 2022 Author Share Posted June 26, 2022 Thanks RFguy, most helpful. Link to comment Share on other sites More sharing options...
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