Pardon my ignorance... I'm not completely clear on what a roofing filter is. I understand traditional filters that control the passband and DSP that also controls the passband through software means. But what exactly is meant by a roofing filter? How is it different then say the crystal CW filter I have in my old Yaesu FT-900?

thanks

Doug -- K0DXV
(K2 1920 & 5837)

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