Bob,
I would recommend you review the forum discussions on this subject last year
from September thru
November. This was discussed extensively. The K3 APF has been optimized. To
reduce the sharp high Q audio sound would entail reducing the Q and flattening
out the response. In essence
reducin
I find the APF to be very effective when preceded by a relatively wider
filter
as suggested by K9ZTV, and offsetting the receive a little as mentioned
by W6OPO.
I generally use the 250 Hz crystal filter, followed by a DSP bandwidth
between
200-300 Hz. I use a macro to turn on APF and FINE and
I've found that using the APF with the 400 filter (or wider) dialed-in
provides less ringing than using APF with the 50 filter (DSP) dialed-in.
Either way, it's effectiveness is excellent, and that from a twelve-year
FT-1000D owner.
73,
Kent K9ZTV
Jefferson City, MO
__
ssage -
From: "Bob Lanning"
To:
Sent: Tuesday, January 25, 2011 3:11 PM
Subject: [Elecraft] APF effectiveness...
> APF ringing and over powering...
>
> I have had input from two Elecraft support fellows one of which was
> helpful. That being move the receiver off frequency (RI
APF ringing and over powering...
I have had input from two Elecraft support fellows one of which was
helpful. That being move the receiver off frequency (RIT) about 10Hz
then adjust the APF center frequency to match. Some help - yes.
But...
The Elecraft implementation of APF in MCU 4.22 just
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