KX2 beta firmware rev 2.75 has two new features: 4 programmable switch 
functions, and two full sets of ATU data, typically used for home/field or for 
two different antennas that overlap in their band coverage. The firmware can be 
found at:

   http://www.elecraft.com/KX2/kx2_software.htm

There’s one minor issue; using PF1-PF4 with some menu entries (like TIME) 
doesn’t allow use of the numeric keypad digits. This will be corrected in the 
next release.

73,
Wayne
N6KR

* * *

KX2 MCU 2.75 / DSP 1.49, 4-3-2017

* 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 
rev. 2.73, 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. <xx> is a 2-digit 
hexadecimal value that, when converted to binary, shows which ATU L or C relays 
are engaged. <y> 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.



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