Posted by
Lu Romero - W4LT on
Oct 25, 2010; 12:39pm
URL: http://elecraft.85.s1.nabble.com/APF-For-K3-tp5671688p5670472.html
Don:
Thanks for the tip on the NR and Dual Passband! Never thought about doing
that! Just tried it. The only thing is that its not variable, which is
sometimes useful in a contest pileup. And you can change the pitch, but,
like my previous post about Icom's pitch, you have to remember to set it
back to "normal" as there is no CLR button. But it does what I think APF
should do, which is peak a certain tone in the context of other signals.
Maybe I can finally pack up the ancient QF-1 and take it to the next
Hamfest!
-lu- w4lt-
Message: 17
Date: Sun, 24 Oct 2010 15:14:45 -0400
From: Don Wilhelm <
[hidden email]>
Subject: Re: [Elecraft] APF For K3
To: Paul Christensen <
[hidden email]>
Cc:
[hidden email]
Message-ID: <
[hidden email]>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I have never used a receiver with a button labeled APF, but I have
used my K2 with an audio filter. It seems to me the only other
characteristic of APF is that the center frequency can be changed.
On the K3, we have the Dual Passband that may work in a similar manner.
Set the width to the lowest value 50 Hz and turn on Dual PB and you have
a wide filter with a peak at your sidetone pitch. You can change the
Pitch if you wish to peak a different audio frequency, but for the life
of me, I cannot imagine why anyone would want to peak any pitch other
than his preferred sidetone pitch.
If you want a little more peaking, turn on NR and set it to an
aggressive setting. The way NR works is that it builds a narrow filter
around a signal that it thinks is a valid signal - so you have a filter
at the audio pitch where you have set the VFO.
Yes, the K3 is different than those receiver that have APF, but in my
opinion, it accomplishes the same thing, but differently.
73,
Don W3FPR
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