Is this to minimize a constant frequency shift between TX and RX or is it related to phase response (or something else)?
73 es TNX,
Leigh/WA5ZNU

wayne burdick wrote:
MCU 2.15 / DSP 1.84, 7-8-08
...
* SYNC DATA: Selecting sync data or ā€œ-Sā€ now ensures that the
same crystal filter will be used for both RX and TX -- either 2.7 or 2.8 kHz. (Sync data mode, enabled by assigning PF1 or PF2 to CONFIG:SYNC DT, can be used to minimize the error rate of AMTOR, PACTOR, ARQ, and similar modes.) While -S is in effect, the receive crystal filter cannot be changed with XFIL, and SHIFT/LOCUT/HICUT are unavailable. WIDTH can still be changed,
  but it will affect only the DSP IF, not the crystal filter. The RX
and TX first I.F.s will thus remain identical, a requirement for -S operation.

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