Elecraft KX3 firmware `v2.16`

Elecraft · Released Aug 19, 2014 · First seen Sep 14, 2026

v2.16 is not the latest firmware for the Elecraft KX3: the current version is v3.02 (April 8, 2022). Go to v3.02

In short — summary by updatemystuff.com

PL tone deviation corrected (recalibration needed) and antenna jack now outputs optional +5VDC for transverters.

Written from Elecraft's release notes, which are printed in full below.

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KXPA100 AUTO POWER-ON WITH PX3: If a PX3 and KXPA100 are both in the system, KXPA100 automatic power-on will now work even if the PX3 is turned on first. (Note that at present there is no way to do automatic power-on of the PX3 itself.)
PL TONE FM DEVIATION ERROR: The PL tone deviation displayed in the menu was about 40% lower than the actual deviation value in effect. Because of this, repeater users should re-check their PL deviation setting. To do this, locate the FM DEV menu entry, then tap 1 to switch to PL DEV. Set the value to 0.35 (kHz)the new defaultunless some other value is applicable.
2M/4M ANT. JACK PROVIDES OPTIONAL +5VDC DURING TRANSMIT: Many high-band transverters and other gear can use a DC voltage of 3-12 V on the center conductor of the antenna coax to provide T/R switching or other functions. The KX3-2M/-4M module can now place +5VDC (+/- 0.3 V) on the antenna jack if desired. To turn this feature on/off, locate the 2M/4M menu entry and tap 2 (ATTN switch). The parameter will be either TXant 5V- (off) or TXant 5V+ (on). “ant” is displayed as a small antenna symbol.

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