Someone mentioned that APF rings less when pitch tone is set to 440 Hz
instead of 800 Hz. So, I'm trying and it indeed seems to ring less.
Anyone else hearing this?
Is this some DSP effect or a psychoacustic effect?
Condition of test:
200Hz 5-pole filter
DSP BW 50Hz
RF gain backed so that
I operate almost exclusively CW and my APF is never turned off.
I use a 400 Hz filter, BW set at @350 Hz, and a pitch setting of
440 Hz.
FWIW, I hear -no- ringing.
73!
Ken - K0PP
On Sun, May 12, 2013 at 8:25 AM, Pierfrancesco Caci p...@tippete.net wrote:
Someone mentioned that APF rings
lower frequency tones too.)
73 Ron AC7AC
-Original Message-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Pierfrancesco Caci
Sent: Sunday, May 12, 2013 1:25 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] [K3] APF and Pitch
Someone
Ron -Original Message-
Ron From: elecraft-boun...@mailman.qth.net
Ron [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Pierfrancesco
Caci
Ron Sent: Sunday, May 12, 2013 1:25 AM
Ron To: elecraft@mailman.qth.net
Ron Subject: [Elecraft] [K3] APF and Pitch
Ron
...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Pierfrancesco Caci
Sent: Sunday, May 12, 2013 9:19 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K3] APF and Pitch
thanks Ron, I guess this relates to Q=f/deltaf ? Didn't even think of this,
and it's interesting
I use 350 hz pitch and with a decent signal the APF works okay although its not
really needed under those conditions. When the signal is very very weak it is
hard for me to tell when the stations stops sending, ie the ring from noise
burst sounds the same as the station transmitting. For that
K3 users may wish to try my Macro's for using APF (CW Audio Peak Filter):
APF ON Turns on APF, puts VFO in Fine tune mode (1 Hz resolution):
IS ;SWH29;RT1;SWT53;RT0;RT1;SWT49;LK0;
APF DN Turns on APF, puts VFO in Fine, turns on RIT and tunes down 20
Hz:
IS
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