[Elecraft] [K3] Date mode question

[David F. Reed]

When I am using MT63 in MARS service (1 KHz wide), we use a center 
frequency of 1KHz, so a pass band from 500 Hz to 1500 Hz; when I set 
date mode, and pick either the 2.7 KHz or 2.1 KHz filter, the data mode 
seems to cut off at a lower frequency of 1 KHz or so; is there an easy 
way to shift the pass band down where I want it?

Thanks and 73 de Dave, W5SV / NNN0SLA