[Elecraft] K3 Firmware rev. 4.39: New main/sub AF mixer settings, high-res. S-meter read command, etc.

[Wayne Burdick]

K3 beta-test firmware revision 4.39 (with DSP rev. 2.73) is now  
available. See detailed release notes below.

Please send any questions to k3support at elecraft.com. For instructions  
on how to load beta firmware, see:

      http://www.elecraft.com/K3/k3_software.htm

73,
Wayne
N6KR

* * *

MCU 4.39 / DSP 2.73  July 6, 2011

* NEW AF MIXER COMBINATIONS (CONFIG:L-MIX-R): Added AB A, B BA, B B, B  
A, A A. These may be useful for “SO2V” operation and various DX/ 
contest scenarios. ("A" refers to the main receiver, "B" to the sub.)

* KAT3 IMPROVEMENTS: T/R timing and power thresholds changed to  
improve SWR measurement sensitivity.

* P3 and PC NOTIFIED ON RX ANT CHANGE: Switching RX ANT on/off now  
informs the P3 and a connected PC of possible changes to the preamp  
and attenuator settings. These are stored separately for the RX ANT on  
and off cases.

* ADDED "SMH" COMMAND (high-resolution S-meter): This is presently  
experimental; it is intended to work with W8WWV's “S-meter Lite”  
program. "SMH;" responds with "SMHxxx;" where xxx is approx. 005 @  
S-1, 040 @ S-9, and 100 @ S9+60. Resolution is approximately 1 dB.  
NOTE: The value returned will probably be adjusted after  
testing.“BG” (BAR GRAPH) REMOTE CONTROL COMMAND: Added 'R' or 'T' at  
end of this command to indicate RX (S units) or TX (watts).