Please update your K3 firmware to MCU revision 1.55, especially if you use data modes. This revision includes major changes to DATA A (generic data mode) and AFSK A (RTTY-optimized data mode), as well as other changes affecting all data modes. Just in time for the RTTY Roundup :)

MCU 1.55, 12-28-07

  * DATA A and AFSK A work correctly in both normal and reverse modes.
  * Power control improved in DATA A and AFSK A modes.
  * CMP (compression) is automatically set to 0 in all DATA modes.
* DATA monitor level is now set correctly on power-up. It's separate from voice monitor level. * SHIFT RANGE in DATA A mode is same as USB/LSB. Had been constrained to +/- 500 Hz. NOTE: SHIFT range in dedicated RTTY modes (AFSK A & FSK D) depends on PITCH selection.
  * ALC/CMP metering automatically disabled in FSK D/PSK D modes.

NOTE: I recommend that you use the latest version of our firmware download program (K3 Utility).

73,
Wayne
N6KR

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http://www.elecraft.com

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