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

[Ian White GM3SEK]

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