zed2 Posted September 6, 2022 Share #1 Posted September 6, 2022 (edited) When removing the antenna cable from the back of the radio, the male plug broke. The plug appears to have a capacitor with the natation “180PF +-10% 50V”. What purpose does this capacitor serve? Thanks, Keith Edited September 7, 2022 by zed2 Link to comment Share on other sites More sharing options...
SteveJ Posted September 6, 2022 Share #2 Posted September 6, 2022 (edited) Read this: https://www.frostburg.edu/personal/latta/ee/twinplex/schematic/twinplexschematic.html Also here: https://maker.pro/forums/threads/car-radio-antenna-has-an-inline-85mfd-capacitor-why.102193/ Edited September 6, 2022 by SteveJ 1 1 Link to comment Share on other sites More sharing options...
zed2 Posted September 6, 2022 Author Share #3 Posted September 6, 2022 So is it more common for the capacitor to be mounted in the plug or on the radio circuit board? Link to comment Share on other sites More sharing options...
SteveJ Posted September 7, 2022 Share #4 Posted September 7, 2022 I wouldn't know. I've never had to design such a circuit. Link to comment Share on other sites More sharing options...
Captain Obvious Posted September 7, 2022 Share #5 Posted September 7, 2022 4 hours ago, zed2 said: What purpose does this capacitor serve? I'm no radio expert, but I believe the purpose of that capacitor is a filter to only allow signals through in the range that the radio cares about. It also blocks any DC voltages, so you won't ever be able to shock yourself by grabbing the antenna or some other strange fault like that. You could put that filter either in the plug (as they have), or inside the radio case, but the sooner you get rid of the stuff you don't want (noise), the better. That's my take. 1 Link to comment Share on other sites More sharing options...
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