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Why doesn't my Short Range Modem work with a Laptop?
Posted by Bob Puckett, Last modified by Danny Staub on 15 November 2017 03:43 PM

 The problem is the P/C AC power source has only two wires are connected: +/- DC, no earth ground. In this case voltages of 75 to 85VAC between the P/C chassis (Signal Ground) and Earth can be found. Grounding the P/C chassis fixed the problem.
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