1. THE PROBLEM
One morning in April 2014, annoying reception interference was discovered on the 20 meter band at TF3JB. The interference was “raw and aggressive” not unlike unfiltered AC. Tuning the transceiver over the band, the interference varied between S5 to S9 in strength; often peaking at close to 14.065 MHz and at times fluctuating up to 14.290 MHz. Similar interference was noticed from 10 MHz to 25 MHz, but less in signal strength……
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