Elecraft K3S firmware v3.84

MCU 3.84 / DSP 2.54

For software developers:

• NOISE BLANK​ER LEVEL CONTROL: Added NL and NL$ commands to remotely set DSP and IF blanker levels for main and sub receivers. Refer to the K3 Programmers Reference, revision C10 or later.

Changes related to European FM and Repeater Operation:

• 12.5 AND 25 KHZ VFO INCREMENTS (FOR EU REPEATERS) :

Added 12.5 kHz and 25 kHz step sizes in FM mode. To specify step size, select FM mode, then use the CONFIG: VFO CRS menu entry.

• SQUELCH-CONTROLLED 1750-HZ PL TONE: Some EU repeaters require a 1750-Hz PL tone burst to open. Previously, an 0.5-second burst was generated at the start of each transmission.

Now, this tone is only generated if squelch is not already open. The squelch-controlled PL tone feature can be turned off by setting the PITCH parameter to PL OFF. W​ith either the PL TONE or PL OFF setting, the operator can still do manual PL tone burst as described in the next item.

• MANUALLY CONTROLLED 1750-HZ PL TONE:

The operator can now generate a variable-length tone burst at any time while transmitting by holding PITCH switch.

• PL TONE DEVIATION RANGE CHANGED: The deviation range for the 1750-Hz PL tone is now 1.5 to 6.0 kHz. The default, 3.6 kHz, is about 70% of 5 kHz, as recommended for many EU repeaters.

The deviation for sub-audible tones is now stored separately and has a range of 150-600 Hz (default 360 Hz).