KX2 Software Page

KX2 Beta Firmware Revision

See KX2 Beta Release Instructions for a complete revision history.
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MCU 2.75 / DSP 1.49, April 7, 1017

  • FOUR PROGRAMMABLE FUNCTIONS: The KX2 now has four programmable functions, PF1-PF4, rather than one. These can be used to quickly access often-used menu entries. To set up a programmable function, locate the desired menu entry, hold PFn, then tap any of ‘1’ through ‘4’. Exit the menu. From then on, the menu function can be accessed using the associated PFn switch. If a menu entry has only two values (such as ON/OFF), accessing it via a programmable function will select the alternate value, then exit the menu immediately. This is especially useful with menu entries such as DUAL RX, VOX MD, ALT MD, and ATU DATA (see below).
  • TWO ATU DATA SETS: The KX2 will now store two full sets of per-band data for the internal ATU (KXAT2). Use the ATU DATA menu entry to select which set to use. Typically SET 1 is used at a home location, and SET 2 for field operation. They can also be used in cases where more than one antenna is available for a given band. (Note: The ATU DATA menu entry has no effect on KXAT100 ATU data, which is already stored separately for each of the KXPA100 amplifier’s antenna jacks. The KX2 can remotely switch KXPA100 antennas using the ANT.X SW menu entry.)
  • ATU LC NETWORK VALUE DISPLAY: In either the ATU.DATA or ATU MD menu entry, tapping the "ATU" switch shows the present values of L (inductance), C (capacitance) and N (L-network configuration). This applies only to the internal ATU (KXAT2). The displayed data format is LxxCxxNy. is a 2-digit hexadecimal value that, when converted to binary, shows which ATU L or C relays are engaged. shows which side of the L-network the capacitance is on: Nt = TX side, and NA = antenna side.
  • ATU CLEAR AFFECTS ONLY CURRENT DATA SET: Within the ATU DATA or ATU MD menu entries, CLR (hold of the OFS/B knob) now clears KXAT2 ATU data only for the presently selected data set (SET 1 or SET 2) on the present band. As before, CLR is recommended when using the internal ATU with a new antenna. Once the data is cleared, very few ATU tune operations will usually be needed to cover an entire band. Note: If a KXPA100 amplifier is connected, the CLR operation applies to the KXAT100 ATU’s per-band/per-antenna data, not to the data for the internal KXAT2 ATU.
  • PSK-D/FSK-D SIDETONE HANG FIXED: Corrected a problem where sending characters at very slow speeds or with paddles continuously pressed could cause a transmit timeout, leaving the sidetone on.

KX2 Production Firmware Revision

See KX2 Firmware Release Notes for a complete revision history.
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MCU 2.69 / DSP 1.49, Final Release Feb 5, 1017

  • PSK63 FIX:th PSK63 mode.
  • ALT MD MENU ENTRY IMPROVEMENT: Some users found that the ALT MD menu entry didn’Some users found that the ALT MD menu entry didn’t switch modes consistently or cleanly. This is a long operation internally to the firmware, so the VFO A knob rate was slowed down (parameter adjust).


MCU 2.68 / DSP 1.49, 9-23-2016

  • AM MODE ADDED:M mode ca AM mode is now available on the KX2. (AM mode can be removed from the MODE switch rotation by setting MENU:AM MODE to OFF.) AM Receive: AM mode can provide a "warmer" sound when used to copy shortwave broadcast stations, and VFO tuning is less critical than when using SSB modes to copy AM. MENU:VFO CRS provides coarse-tuning selections of 1, 5, 9 and 10 kHz for AM mode. AM Transmit: AM is far less power-efficient than SSB, so SSB is preferred for most communication purposes. However, AM is in use on the ham bands. A good place to look for AM signals is around 3.870 MHz at night. Note: Speech compression should in general be turned off when transmitting in AM mode (set MENU:TX CMP to 0).


MCU 2.66 / DSP 1.48, 6-24-2016

  • AUDIO-CW USER INTERFACE IMPROVEMENTS: The KX2 can emit CW characters when switches are pressed and knobs are turned, etc. For details, see the document, "Elecraft KX2 Physical Description and Audio-CW User Interface." Audio-CW tones can be enabled in the menu (see MENU:SW TONE), or on power-up, by holding APF along with RATE and A/B. Release RATE and A/B first, then release APF. This sets the speed to 20 WPM. The menu entry provides more speed selections. KX2 CW UI


MCU 2.59 / DSP 1.39, 5-20-2016

  • DSP BUG FIXES:"ERR DSE" error conditions that appeared on a small number of KX2s, typically at power-up.
  • MIC BTN, MIC BIAS, and all VOX MENU SETTINGS ADJUSTABLE IN ALL MODES: Locking these out was causing problems in some cases. None of these settings apply to the internal mic, but you can now adjust them with or without an external mic plugged in.


KX2 Utility and Drivers for Windows


Minimum Operating System Requirements for Elecraft Utilities:

Microsoft Windows: XP Service Pack 3 or later, including Vista, 7, 8, and 8.1.

Apple Mac: OS X 10.6 (Snow Leopard) or later

X86-based Linux: GTK+ 2.8 or later, glibc-2.4, libstdc++.so.6 and cURL. 64-bit Linux requires 32-bit compatibility libraries.


Elecraft KXUSB Cable for the KX2

Elecraft offers the KXUSB cable for USB only computers etc.  It uses the FTDI chip set.

Before plugging in this cable to any of your computer's USB ports, you may need to install the correct FTDI USB drivers for your computer's operating system.   Drivers are available for most Windows, Mac, and Linux OS's.  Note that most of the latest Windows 7 operating systems already have the proper drivers for the FTDI chip set and will automatically install them if you just plug the KXUSB cable into a USB port.

Connecting the KX2 to a Computer

If your computer has a standard serial port, all you will need is our KXSER cable for the KX2.

Most modern computers no longer have serial ports but instead use USB (Universal Serial Bus) ports for connecting to external devices. Elecraft provides the KXUSB cable to connect the KX2 to these computers.

KX2 Utility Download