Elecraft K3S firmware v3.76

MCU 3.76 / DSP 2.52

Changes related to K144XV, transverters, FM, and repeaters:

• REPEATER REVerse: If a rep​eater offset is in use (+/-), holding REV switches VFO A to the repeater's input frequency.
• RF POWER BARGRAPH: Now shows *tenths of a milliwatt* when using low-level transverter I/O (applies to both the K144XV and external transverters). 10 bars = about 1.00 mW at the IF. This corresponds to about 10 W output when using the K144XV.
• COARSE TUNING WITH XVTR OFFSETS: Fixed problem with VFO display when using COARSE tuning steps in combination with a non-zero transverter frequency offset (CONFIG: XVn OFS).
• IMPROVED FM RECEIVE: FM demodulation algorithm refined to reduce signal distortion.
• FM SQUELCH: No longer opens briefly during memory recall.
• "ANT3" REMINDER WHEN K144XV SELECTED: If you switch to a band configured for use with the Elecraft K144XV internal 2-m module, ÒANT3Ó is flashed to remind you to use the separate BNC antenna jack provided on the fan panel, rather than ANT1/2.

Other new features and

improvements

• NR (NOISE REDUCTION) ON/OFF: This is now saved on a per-band/per-receiver basis (same as NB). NR ADJ (noise reduction setting) is stored independently for each mode.
• TX MESSAGE MEMORY ERASE: To completely erase a transmit message buffer, tap REC, then M1-M4, then CLR.

Note that erasing a CW/DATA memory will not erase a DVR Message assigned to the same M1-M4 switch, and vice-versa.

• ERR PTT & ERR KEY (rig keyed at power-up): ​These error conditions no longer lock out the POWER switch.
• DELAYED MEMORY RECALL (M>V): In CONFIG: MEM 0-9, tap '1' to select "M>V NOR" or "M>V DLY". NOR is the default, resulting in ÒliveÓ memory recall as you rotate VFO A. In the "DLY" case, the receiver is not updated until you tap M>V a second time to exit memory recall. You may prefer ÒDLYÓ if you have external gear that switches as the K3 changes bands.
• 40-M TX RANGE EXTENDED TO 7.650 MHz (12 W MAX): TX near the first I.F. has always been disabled from 7.550 to 8.990 MHz to protect the 8.21 MHz trap on the KAT3 or KANT3 module.

At power settings of 12 W or lower, the upper limit is now 7.650 MHz, allowing use of some additional MARS channels. Remote Control Command Changes:

• XF/XF$ COMMAND ADDED: Returns crystal filter number (1-5) presently selected for main (XF) and sub receiver (XF$). GET only.

Not usable during BSET or REVerse.

• SQUELCH STATUS ADDED TO IC COMMAND: Byte e, bits 4 (main RX) and 3 (sub RX). 1 = squelched. (Works for both FM and non-FM squelch.)
• SUB RX NR STATUS ADDED TO IC COMMAND: Byte e, bit 2.

EEINIT (EEPROM Initialization) Changes:

• PL deviation (FM) set to 0.36 kHz (was 0.00)
• Power output set to 5/50 W (was 0)
• CONFIG: SPLT SV set to YES
• RTTY mark tone set to 2125 Hz (was 1275)