Steve: Considering all the CW operating I do, I guess I'm no expert on this either, and have sure learned a lot today. As it turns out, my transmit and listening frequencies were never that far off, but the auto-zero-beat function allows me to be sure, which is a good thing. I guess one of the reasons for CW reverse is that you can doublecheck to be absolutely sure you are zero-beat with the station you are working, as the article Danny sent out explains. There may be other reasons for using CW reverse, but I am not totally sure what they might be. Tom Behler: KB8TYJ -----Original Message----- From: For blind ham radio operators [mailto:[log in to unmask]] On Behalf Of Steve Forst Sent: Sunday, March 09, 2014 2:11 PM To: [log in to unmask] Subject: Re: Auto Zero Beat With Ts590 Tom, I'm no cw guy, but use this feature all the time and have this function set to one of my extra pf keys for easier use. I don't recall the limits offhand, but both filter bandwidth and shift need to be below certain values i.e. if the filter is too wide or the pitch too high, the feature won't work. I think this feature was a 2 button press on the TS-2000, but only a single press for the 590. I have to admit I never understood what the cw reverse was all about, but hopefully I'll learn something. 73, Steve KW3A