Copying station on 20m CW with the preamp on and the thr above 8 there is a very noticable distortion to the signals. SLP does not seem to change this. I don't know if the Thr is adding to the noise thus making the cw sound distorted or something else. -- Mike W0MU W0MU-1 CC Cluster w0mu.net:23 or w0mu-1.dnsdynamic.com Http://www.w0mu.com