This Hack-A-Day article explains the significance of 6EQUJ5 on the paper readout of the Big Ear radio telescope. It is a signal-to-noise readout.
The article also has interesting information about the radio telescope that was used.
I have on my shelf John Kraus W8JK's wonderful book "Big Ear Two -- Listening for Other Worlds." John Kraus is the guy who built the Big Ear. In a reminder of how new radio technology really is, Kraus got his start in radio as a ten year-old boy in 1920. He ripped the wire out of the ignition coil of a Model T Ford to make a tuning coil for a crystal radio. He took the earpiece out of the family telephone. His father gave him a chunk of Galena. He used the crystal radio to listen to the early broadcasts of WWJ in Detroit.
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My Elmer Bob Scott WB8JEY lived down the road from the Big Ear stopped and had a look more than a few times very impressive for a 19 year old. Got to listen to Bob Kruse talk at COSI super interesting.
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