[Milsurplus] U.S. Navy ECM gear in WWII?

[Jack Sullivan]

 I was reading about the radio proximity fuze that the U.S. developed in WWII & was used to great effect in the Battle of Okinawa as well as in Europe. As the fuze was an oscillator coupled to an antenna it radiated a low power CW electromagnetic field in the 180-220 MHz range. What caught my attention was U.S. concerns that these signals could be intercepted by the enemy & this information used to develop countermeasures against the shells. As a countermeasure, this source stated that the Navy transmitted spoof signals to confuse any enemy radio intercept activity. Despite the fact that these fuzes were declassified in 1970, I am not familiar with the equipment that might have been used to generate these spoof signals. Any one have any insights to this?
Jack
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