[Elecraft] K3 Beta Release: APF for CW; "Fast Monitor" & improved TX gate for voice modes

[Amateur Radio Operator N5GE]

On Wed, 03 Nov 2010 21:20:44 -0400, "Joe Subich, W4TV" <lists at subich.com> wrote:

I agree with you Joe.  Long Hold would be my preference.

Tom
Radio Amateur N5GE 

>
>>> To use APF, make sure CONFIG:DUAL PB is set to APF. (This is the
>>> default. “NOR” restores the original DUAL PB function.)
>
>Given the value of both APF and Dual PB filters, the "menu dance"
>to switch between the two is a very big drag.  Please provide a
>way to select either function (I'd suggest "Hold" and "Long Hold"
>as used with Link/Diversity) without resorting to the CONFIG
>menu.
>
>73,
>
>    ... Joe, W4TV
>
>On 11/3/2010 4:05 PM, Wayne Burdick wrote:
>> K3 beta-test firmware revision 4.17 (with DSP rev. 2.65) is now
>> available. This release includes our new APF (audio peaking filter)
>> for CW mode, which has been helping K3 field testers work "extreme"
>> weak DX for the past several days.
>>
>> For voice modes, there's a "Fast Monitor" option (TX voice monitor
>> without the processing delay). Also included is a much-improved TX
>> Noise Gate.
>>
>> 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 4.17 / DSP 2.65 / FPF 1.14, 11-2-2010
>>
>> NOTE: Be sure to install all firmware files for this release,
>> including FPF 1.14. Otherwise your menu text will be incorrect.
>>
>> * APF (AUDIO PEAKING FILTER) ADDED: APF provides enhanced
>> copy of weak signals in CW mode, and is especially useful when
>> signals are at the noise level. The K3’s APF is patterned after
>> the most successful analog APF implementations, and is equally
>> effective in user tests. To use APF, make sure CONFIG:DUAL PB
>> is set to APF. (This is the default. “NOR” restores the original DUAL PB
>> function.) Then hold DUAL PB to turn APF on/off. A special DSP
>> graphic display is used to show that APF is in effect. At the time
>> APF is activated, the regular I.F. SHIFT setting, if any, is “frozen,”
>> and SHIFT then controls the center pitch of the APF filter in 10-Hz
>> steps. APF is independent for the main and sub receivers, as well
>> as for presets I and II. Switching between these two presets is a
>> convenient way of turning APF on/off quickly.
>>
>> * ADDED VOICE TX “FAST MONITOR”: Normally the voice
>> monitor includes a ~20-ms delay, which is necessary to hear how your
>> on-air signal will sound (with compression, etc.). If you prefer to not
>> hear any delay in the voice monitor, set CONFIG:TX MON to FAST.
>> Note: You’ll still hear the delayed and processed monitor if you
>> adjust the MIC, CMP, TX EQ or TX GATE settings while transmitting.
>>
>> * TX NOISE GATE IMPROVEMENT: The Noise Gate/Downward
>> Expander for voice modes has smoother response and much
>> improved performance near the threshold.
>>
>> * NARROW AF FILTER IMPROVEMENT: Adjusting SHIFT and
>> WIDTH when using very narrow DSP filters no longer causes
>> ‘pop’ artifacts.
>>
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