[Elecraft] K3 Beta Firmware Release -- MCU Revision 2.15

[Leigh L. Klotz, Jr.]

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 “-S” 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.
>