Many modern rigs boast sophisticated DSP (Digital Signal Processing) features and the option of additional filters to improve clarity of received signals. Evaluating the performance of those features is difficult and getting the best practical value is largely a process of trial and error. This article describes an interesting CW operating problem and a solution from an unlikely source: data mode software. I was still working away at reaching that elusive 12WPM standard for the RSGB Morse code test [now 5WPM - Ed] before I graduated to my Full A licence. Following the advice of my CW mentor, Tony, GOPEH, I regularly listened to CW on the HF bands to aid my receiving practice. Using an Icom IC-706, I found the radio's bandwidth too wide to pick out the signals I wanted to hear. A 500Hz narrow filter seemed to offer a good solution. However, getting good results in. practice seemed to be very difficult.
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