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that operated on different frequencies, notably the 75 MHz used by the GL Mk. I radar and the 43 MHz used by the Royal Navy's Type 79 radar. To address this, development of the IFF Mark II began in October 1939 and the first units were available in early 1940. This used a complex mechanical system to select among several separate radio tuners and sweep through each one's band of frequencies, ensuring it would hear the radar

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