Want to use 50 Hz DSP filter for PSK31 on your TS570D?
(should work on other rigs, too, by transposing these directions to your rig!)

Setup:

    Set the step size for the MULTI/CH control to 1 kHz with menu #3.

    Turn the MULTI/CH rounding OFF with menu #5.

    Set your CW RX Pitch to 1000 Hz with Menu#20.

Operation:

    Using VFO A, set mode to CW and the DSP filter to about 500 Hz.

    Tune around and find someone to call.  Tune them in.

    Press A=B.

    Press A/B.

    Now on VFO B change the mode to USB.

    On VFO B change the frequency with the MULTI/CH to exactly 1 kHz. lower - 
just one click!

    Press A/B.

    Press SPLIT.

    Narrow up the filter as far as you want - even to 50 Hz.

You are now receiving using CW with the narrow DSP filters and transmitting 
on the same frequency using USB.

Of course this only works if you are using PSK31 with 1000HZ tone - which I 
assume most of us are!

At 50 Hz you can't even see those 'ugly' sidebands some stations are putting 
out!  I usually use 150 or 200 Hz DSP selectivity just so I can see what's 
going on.

Try it and let me know what you think.  It's amazing what the DSP can do!

George
WB2AEF