Elecraft K3S firmware v4.31

MCU 4.31 / DSP 2.72

• QRQ CW AUTO-OFF ON SPLIT/RIT/XIT: QRQ CW is now automatically t​urned off whenever you turn on SPLIT, RIT, or XIT.

Youll see "QRQ OFF" flashed on VFO B. QRQ mode is restored if you turn these off. (For QRQ CW details, see Rev. 4.03 notes.)

• REVERSE (REV) FOR FM/REPEAT IS PERMANENT: Pressing REV when in FM mode with a repeater offset (+/-) selected now permanently swaps RX/TX frequencies and reverses the repeater offset direction. You do not have to continue to hold the REV switch.
• 2-METER MODULE ÒS9Ó METER LEVEL ADJUSTED: The ÒS9Ó level on the K3s S-meter now occurs with an input signal level of -93 dBm when the K144XV is selected. (This is a recognized standard on bands from 2 meters up. On other bands, ÒS9Ó still occurs at -73 dBm.) Notes: (1) The K3s S-meter may not go all the way to S0 on this band because of the high preamp gain on the K144XV module. (2) If you have SMTR MD set to NOR, the S-meter reading will vary with the settings of the PRE and ATTN controls.
• FRONT PANEL MIC PREAMP GAIN CONTROL: The front panel mic preamp has a high-gain setting that is now accessible. (This is independent the present Òmic boostÓ DSP function.) If you use a low-output mic element, you may benefit from the high-gain setting.

In MIC SEL (MAIN menu), use VFO A to select the front-panel mic (FP), then tap 7 on the keypad to select high preamp gain.

A Òhigh barÓ symbol will appear to the right of the mic boost character (L or H).

As a reminder, DSP mic boost (H, or Hi) can be turned on/off by tapping 1 on the keypad.

Bias is controlled by 2.

• EXTERNAL 10-MHZ REFERENCE SUPPORT (K3EXREF):

When the K3EXREF option is installed, the K3​ will use it to automatically calibrate the internal 49.380 MHz reference oscillator.

The user must provide a suitable 10-MHz input signal to the module.

Typical accuracy at the operating frequency, when locked, is +/- 1 Hz, (The K3EXREF uses frequency locking, not phase locking.

See K3EXREF installation manual for further details.) Remote-Control/Switch Macro Command Changes:

• "AP" COMMAND TURNS APF ON/OFF: You can turn the CW audio peaking filter on/off by sending ÒAP1;Ó or ÒAP0;Ó, respectively.

Applies only in CW mode with CONFIG: DUAL PB set to APF. (Not yet available for direct sub receiver control. Swap VFOs or do A>B copy in order to set up sub receiver APF.) You can use this command to create a TAP function to turn APF on/off; use the Help function in K3 Utility for details on macros.

• "BG" COMMAND USEABLE IN TX MODE: Reads PWR or ALC depending on METER setting. Note: In RX mode, BG returns up to 21 with CWT off, but only up to 09 with CWT on. Also, at present there is no way to read CWT, SWR, or CMP.
• CHANNEL HOPPING CANCELLED ON FA/FB BAND CHANGE.