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

Posted by gm3sek on Jun 27, 2012; 12:52pm
URL: http://elecraft.85.s1.nabble.com/K3-KX3-Operating-Tip-APF-audio-peaking-filter-for-weak-signal-CW-work-tp7558208p7558249.html

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.


--

73 from Ian GM3SEK
http://www.ifwtech.co.uk/g3sek
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