Howard: Now that I use a Tentech 238A manual tuner all the time, I agree with you totally. I think the auto tuner in the TS480 is good for basic functional purposes, but I think my Tentech manual tuner wins hands down, both in terms of receive noise, and in terms of matching what I have available for antennas. I don't have an explanation for the difference you suggest, but I really do agree with you that the difference is there. 73 from Tom Behler: KB8TYJ ----- Original Message ----- From: "Howard Kaufman" <[log in to unmask]> To: <[log in to unmask]> Sent: Sunday, March 28, 2010 5:25 PM Subject: ts480 test I don't trust my observation, so I'd like somebody else to test it. After a day of experimentation, I think that using my ts480 with an external tuner, provides a better signal to noise ratio after tuning the antenna, than does bypassing the external tuner and using the internal tuner. I don't use the internal tuner on receive. I'd like an observation and an explanation. Seems surprising to me. H T Kaufman MSW LCSW Adaptive Technology Instructor