Elecraft K3S firmware v2.82

MCU 2.82 / DSP 2.00

Data Mode Changes:

• AFSK MODE TRANSMIT FILTERING: Some K3 owners have reported hearing noise on their RTTY transmit signal when using AFSK-A mode. Possible sources of noise include RFI, ground loops, low AF level, or poor mark/space transition shaping by software. The effects of noise from many sources can be eliminated by using a narrow, constant-de​lay transmit filter (DSP).

To enable this filter, set CONFIG: AFSK TX, to FIL ON (default is OFF).

• SSB/DATA-A/AFSK-A TRANSMIT POWER LEVEL: Power output in these modes now more closely the requested power. Because of this, we recommend setting CONFIG: TXG VCE to 0.0 dB after loading this release, then adjusting the value only if necessary.
• DATA MODE ALC METERING: ALC metering for DATA-A and AFSK-A modes has been adjusted to make the transmit audio level easier to adjust.

As before, the recommended audio level for transmission is 4 to 5 bars. 3 bars will appear as soon the minimum required level for good S/N ratio has been reached.

• FSK POLARITY MENU ENTRY: Setting CONFIG: FSK POL to 0 reverses RTTY data polarity (applies only to FSK-D mode transmit) . Note: If you use the ALT switch to select DATA REV mode, this reverses both RX and TX tones, in both AFSK-A and FSK-D modes. This should rarely be required.

FSK POL can be used by itself or in combination with DATA REV. Misc. Changes:

• DVR MESSAGE CANCEL WITH PTT OR VOX: Both one-time and repeating DVR transmit message play can now be cancelled cleanly with either PTT or VOX.
• AM MODE SPEECH COMPRESSION: Speech compression is now available in AM mode. This can add punch to your AM signal. As with any type of compression, it should be used only when necessa​ry.
• FM TX DEVIATION: This is now more accurate. Previous versions could underdeviate by as much as 1 kHz. Setting is now accurate from 3.0 kHz to 5.0 kHz of deviation when modulated by 1 kHz tone with 5 bars of ALC indicated.

For software developers:

• ÒBNÓ COMMAND ADDED (Band Number). GET only. This command returns the K3s present band number (0-10 = 160 m - 6 m, 11-15 reserved for future use, 16-24 = XVTR bands 1-9). It is useful for software applications that need to know if the operator has tuned the VFO across a logical band boundary. This eliminates the need for applications to keep track of what the K3s internal band boundaries are.