[Elecraft] K3 Beta firmware rev. 2.46 -- 40 meter PA current reduction

[wayne burdick]

K3 beta-test firmware revision 2.46 is now available. Details appear 
below. Be sure to use the latest revision of K3 Utility to do the 
downloads.

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

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

73,
Wayne
N6KR

* * *

MCU 2.46 / DSP 1.92, 10-3-2008

* 40 METER PA CURRENT REDUCTION: This revision corrects the low-pass 
filter configuration used on 40 m. The 10/12 LPF, not the 6 m LPF, is 
now used in-line with the 40 m LPF. This optimizes return loss, keeping 
current at the target level at 100 W (about 20 A). Some K3s may have 
had 40-m current drain increase running rev 2.45.

* NOTE ON AM COMPRESSION: Starting with MCU 2.45/DSP 1.92, speech 
compression has been disabled in AM mode. We hope to create a more 
effective compressor for AM in a future revision; the original was 
adding distortion without increasing “punch”. On the other hand, the 
available AM modulation level  has been increased, and we’re better 
utilizing the mic AGC system in this mode.


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