[Elecraft] K3 Beta Firmware Release -- MCU Revision 2.19

[wayne burdick]

K3 beta-test firmware revision 2.19 is now available. Details appear 
below and in the release notes.

The use of beta-test firmware is encouraged, but optional. Please send 
any problem reports to k3support at elecraft.com. For instructions on how 
to obtain and load beta firmware, please see:

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

73,
Wayne
N6KR

* * *

MCU 2.19 / DSP 1.87, 7-22-08

* AGC: Slope is now approximately linear in dB.  Threshold
   moved about 10 dB lower, closely matching earlier DSP revisions.

* USER INTERFACE: Minor clean-up of menu entry text and parameters,
   help text, error messages, etc., to make operation more intuitive.

* SUB RX ON/OFF now has no effect on SPLIT, RIT, or XIT.

* SUB RX SYNTHESIZER is no longer updated when sub RX is turned off,
   even with VFOs linked. This prevents an audio artifact when tuning. 
Also
   eliminated interaction between main and sub synthesizers during T-R
   switching that was causing keying artifacts at very specific 
frequencies
   on some bands.

* IIR DSP FILTER ON/OFF SELECTION now applies to both main and sub
   receivers. (IIR filter on/off is selected by tapping the ‘7’ switch 
while in the
   FLx BW menu entry. IIR filters apply only to 100 Hz and narrower DSP
   bandwidths. They have slightly more ringing than the default FIR 
filters.)


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