Elecraft K3S firmware v4.57

MCU 4.57 / DSP 2.79

• AM TRANSMIT CAN USE THE FM FILTER: The wide (FM) crystal filter can now be assigned to AM transmit as well as FM. This can potentially free up a crystal filter slot for customers who were using the 6-kHz filter only for AM.
• K3EXREF USERS MUST NOW ENABLE THE MODULE IN THE MENU: To do this, locate the CONFIG: REF CAL menu entry and tap 2 to change the setting; f​lashes XREF IN or XREFOUT. If you DO NOT have a K3EXREF module installed, use the XREFOUT setting (the default). If you use the XREF IN setting without a K3EXREF module installed, you may hear digital switching noise on the 6-meter band.
• REMOTE-RIG (K3/0) BUG FIX: The SUB RF GAIN control now works correctly.
• XVTR BAND DISPLAY FIXED FOR MICROWAVE BAND DISPLAYS: Previously, a band defined as 3400 MHz in CONFIG: XVn RF would not produce the correct display when the VFO was tuned below 3400 MHz.
• PSK-D/FSK-D PROSIGN TRANSMIT FIXED: Was sending "BB" for "BT", "AA" for "AR", etc., always duplicating the characters.
• VOX TRANSMIT TERMINATIO​N VIA REMOTE CONTROL FIXED: The "RX;" remote control command will now properly terminate transmit when VOX is in use. Some customers who use VOX in audio data modes will find this useful. Previously the K3 would sometimes not exit transmit, requiring an additional "RX;" command.
• VFO A/B REV AND SWAP DE-GLITCHED: In rare cases, swapping VFOs would generate a loud audio artifact.