Re: K3/KX3 Operating Tip: APF (audio peaking filter) for weak-signal CW work

Posted by Joe Subich, W4TV-4 on Jun 27, 2012; 1:15pm
URL: http://elecraft.85.s1.nabble.com/K3-KX3-Operating-Tip-APF-audio-peaking-filter-for-weak-signal-CW-work-tp7558208p7558250.html


 > And the point is: it's fixable.

It is not fixable to your definition without changing both the front
panel (engraving) and keytops (legend).  Moving XFIL to HOLD would
be extremely inconvenient for users of that function (it is very
difficult to do multiple HOLD gestures) and the current assignments
are not cumbersome.

One can also assign a PF Key (I use PF 2) to toggle the function of
DUAL PB=HOLD between Dual PB and APF as needed.

The current implementation is quite usable given the limited number
of individual controls (number of buttons) available on the front
panel.

73,

    ... Joe, W4TV



On 6/27/2012 8:52 AM, Ian White GM3SEK wrote:

> Pierfrancesco Caci wrote:
>>
>> I'd hate to lose the possiblity to quickly tighten the filters with one
>> tap (think digimodes, where you switch from looking at a 3 kHz
>> waterfall down to a single psk signal with just 3 presses of that
>> button). What about long hold (more than 3 seconds)? I think long hold
>> is already used somewhere else in the firmware, so the function to
>> recognize it is already there.
>>
>
> A three-level button function including 'Long hold' is not
> user-friendly. 'Long hold' is sloooow (by definition!) which means that
> one group of users is sure to get a raw deal. Also, inexperienced users
> can easily get lost in the deeper levels.
>
> 'Choose two out of three for Tap and Hold' is far more user-friendly.
>
> As I already said, anyone who regularly uses XFIL could simply stay with
> the default.
>
> G3XDY has also identified a serious problem about the XFIL button when
> attempting to turn the APF off. With the bandwidth already cranked down
> to your narrowest CW filter, hear what happens if you don't hold the
> XFIL/APF button for long enough. A fraction of a second's error blows
> the bandwidth wide open! When you're wearing headphones and listening
> really hard for a weak signal, that blast of noise is extremely
> unpleasant.
>
> And the point is: it's fixable.
>
>

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