Digital Frequency Counter
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 1MHz 26GHz Signal Digital Frequency Counter Tester c  US $48.50
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 Radio Shack 22 305 LCD RF Frequency Counter Digital US $39.99
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 50MHz 24GHz Signal Digital Frequency Counter Tester O US $30.54
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 LCD Digital Frequency Counter Tester 50 2400MHz Signal US $29.99
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 Digital and Analog Frequency Counter US $28.99
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 50MHz 24GHz Signal Digital Frequency Counter Tester a US $27.75
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 N3ZI FREQUENCY COUNTER DIGITAL DIAL for VINTAGE RADIOS US $27.50
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 N3ZI SUPER FREQUENCY COUNTER DIGITAL DIAL 60MHz No LCD US $25.00
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 Digital Frequency Counter Tester 50 24GHz Signal GY560 US $24.98
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Is blackground level of X-rays and high energy rays look like a low frequency digital signal?
000001001010100000 as measured in geyger counter
If you are talking about the three degree blackbody background that permeates the universe, it looks like noise. Meaning that if you were to put it on a TV, it would look like the "snow" you get when the channel is out.
On a radio, it adds a low level "buzz" - although modern noise reducers take most of it out.
On a Geiger counter, you couldn't tell it from the random background that any detector has.
My point - you would never be able to tell which of the counts was random and which of the counts were caused by the universe's background.