I'm new here. I am interested in discussing anything about the efforts of the Navy during WW2 to counteract the radar problem.

regards,

Bank Teller

look up the Philadelphia experiment as they were trying to make a ship invisble to radar and visually

I am pretty sure pilots were using chaff as early in WWII, but dont quote me on that.

I was wondering if anyone knows when the concept of jamming came into existence??

Not sure about naval surface ship attempts to jam radar but I do know a little about airborne radar jamming techniques. Chaff was referred to in WWII as "WINDOW" and was first used in July 1943 during an RAF night raid on Hamburg, Germany. Basically the chaff was strips of aluminum foil that they cut in widths to match a specific ratio of the German radar's wavelength.

Also, the US Navy experimented in making anti-sub aircraft virtually invisible at altitude by installing several arrays of lights on all surfaces of the wings, fuselage, etc. By measuring the amount of apparent light surrounding the craft, these lights would then be turned on and adjusted to make the craft nearly invisible while at altitude. I even saw some old Navy footage of a demonstration that was pretty convincing. I'm pretty I saw this on the old Discovery Channel "Wings" series. The US Navy project was called "Yehudi" that started in 1943 as a way for anti-submarine aircraft to be able to "sneak up" on surfaced submarines at sea.

W.E.S.B