http://elecraft.85.s1.nabble.com/AF-1-For-Sale-or-Trade-tp6221588p6224075.html
Agreed! Let's face it...if you have a K2 the only way to do better is to get a K3. And if you have a K3...well, you can't hope to do better (until the K4 comes out!)
> From: Ron D'Eau Claire <
[hidden email]>
> Subject: RE: [Elecraft] AF-1 For Sale or Trade
> To: "'Ken Alexander'" <
[hidden email]>
> Cc:
[hidden email]
> Date: Wednesday, March 30, 2011, 10:51 AM
> No argument Ken! The AF-1 wasn't
> created as a K2-specific accessory, but as
> a useful little filter for any receiver (especially
> "lesser" receivers
> without the K2's filtering) or as an adjunct to simple
> homebrew receivers. I
> don't use the low pass capability with the K2 either.
>
> My point was that it does provide a nice "audio peaking
> filter" (APF) that
> many people enjoy on the K3. And again you are right - I
> use the APF only
> for certain specific situations where the signal is down in
> the noise.
>
> I was pointing out that capability for anyone without a K3
> who wanted that
> feature for their K2, K1 or even the KX1.
>
> 73,
>
> Ron AC7AC
>
>
> -----Original Message-----
>
> Hi Ron,
>
> I did notice the peaking effect, but I didn't think the
> improvement was all
> that profound. Also, the effect of the low pass filter is
> barely noticeable
> on the K2. I sent an e-mail to tech support at Elecraft
> and was told to use
> it with a receiver with a wider audio bandwidth.
>
> I considered that a non-answer, but after thinking more I
> realized what they
> were saying was that the K2's audio was already pretty
> narrow so I shouldn't
> expect much. They hint at that in their description of
> the AF-1 on their
> website. I think the AF-1 would be much more effective
> overall when used
> with a "lesser" receiver. For my ear, the K2 doesn't seem
> to need the help.
>
> 73 - Ken
>
>
>
> --- On Tue, 3/29/11, Ron D'Eau Claire <
[hidden email]>
> wrote:
>
> > From: Ron D'Eau Claire <
[hidden email]>
>
>
> > FWIW, among other things it does an
> > excellent job of emulating the K3's
> > Audio Peaking Filter (APF). The peak has variable gain
> and
> > Q that can
> > literally pull signals down in the noise up into the
> clear.
> >
> >
> > Great addition to the K2 for weak signal enthusiasts.
>
> >
> > Ron AC7AC
> >
>
>