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or delta. When two FM signals are present on the same frequency, the stronger signal tends to suppress or capture the receiver, making the weaker signal difficult or impossible to hear. I'll let it break and read it one more time for you guys. KG5MCV Retire. What is the capture effect in FM communications? Your options are alpha, the moment your spouse catches you sneaking another radio into the shack and asks, how long have you had that one? Bravo, the phenomenon where a hampass vendor captures your attention with a $20 radio and somehow extracts $300 from your wallet. Charlie, the tendency of every radio project to capture your entire Saturday, your budget, and at least one trip to the hardware store. Or delta, when two FM signals are present on the same frequency, the stronger signal tends to suppress or capture the receiver.