[Elecraft] K3 Firmware Rev. 3.30: Wider NR range; SUB RX NB on/off fixed; DVR TX with PTT

[wayne burdick]

K3 beta-test firmware revision 3.30 (with DSP rev. 2.26) is now  
available. See release notes below.

Please send problem reports to k3support at elecraft.com. Beta firmware  
load instructions can be found at

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

73,
Wayne
N6KR

* * *

MCU 3.30 / DSP 2.26, 9-1-2009

* FIXED NOISE BLANKER ON/OFF SWITCHING IN BSET MODE: You can
now independently turn the noise blanker (NB) on/off for the sub
receiver in all cases. Previously, the NB switch was locked out
in some cases in BSET mode.

* DVR TRANSMIT WITH MANUAL PTT: Normally, playing a DVR
TX message (M1-M4) automatically asserts PTT and goes into
transmit mode. Now, you can manually assert PTT prior to playing
DVR messages, if necessary. (This might be required to meet external
equipment switching requirements at some stations.) To do this: in the
CONFIG:KDVR3 menu entry, tap ‘1’ until you see “USE PTT”.
(This setting is ignored in VOX mode.)

* ELIMINATED AUDIO NOISE BURST WITH NR + AUTONOTCH:
Very rarely, the combination of NR and autonotch, in the presence of
a strong signal, could result in a loud audio artifact.

* MORE NR (NOISE REDUCTION) SETTINGS:  There are now 32 NR settings.
F1-x to F4-x originally appeared in firmware revision 3.27, and are
recommended for most applications. F5-x to F8-x are the same as
F1-x to F4-x from firmware revision 3.25. They provide a varying mix
between processed (“wet”) and unprocessed (“dry”) audio. When x is 1,
the mix is mostly "dry"; when x is 4, it's 100% "wet". A small letter  
“m”
(e.g. "NR m F5-1") reminds you that "mixed" settings are in use.

Note 1: When you’re experimenting with different NR ADJ settings, allow
1 to 3 seconds for the DSP to fully adapt to present signal conditions.

Note 2: F5-x and higher NR settings may alter the amplitude of
single-tone (CW) signals somewhat, depending on the pitch. Voice
signals are less affected.

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