Is there a secret to setting up decode for RTTY? Listening on 40 meters with mark set at 2125. Shift with at 170. Decode USOS set to off. New line code set to CR+LF Keying polarity set to Normal. RTTY filter ON. When tuning a RTTY signal I seem to only get random noise or nothing depending on the threshold setting...or tuning across the RTTY signal. Thanks in advance for any help. Geo W7LFD