John, Sounds like 'specmanship' to me. I don't know about any mod like that. 73, Don W3FPR W0JFR wrote: > There is an ad on eHam for K3 #1055. He says he sent it back to Elecraft and > had "DSP board mod for enhanced RX/TX fidelity." > > Does anyone know what he's talking about? > - John, W0JFR > >