On 2/7/2026 5:18 PM, JC(Jose Carlos) via Topband wrote: > the CW speaker is not a filter with group delay that causes the ring sound.
>Ringing is the result of phase shift produced by filter skirts, and is >excited by noise, and how much is produced depends on curve shaping. >73, Jim When 160m is really noisy, when the narrow 500/250/125 hz xtal filters are used, the noise...'rings out" the filters. W8JI mentioned the same effect years ago. 160m is frustrating at the best of times. Jim VE7RF _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
