[Elecraft] K2 Reception Improvement - DSP or AF filter?

[Darwin, Keith]

Hey Kevin,

I've had both the DSP and AF in my K2 at one time or another.  Currently
I have neither.

I thought the AF was pretty good.  It worked great for removing a lot of
the IF hiss that I would hear in the headphones.  At the narrowest
setting, it rang a bit more than I wanted though.

I tried the DSP for a bit as well.  It did a better job of creating
narrow AF filters than the AF filter did but it too would ring at the
narrowest settings.  I found the NR and other features on the DSP to be
uninspiring.  In the end, I figured it was an awful lot of money to
spend to get narrow audio filtering so I sold it.  In retrospect, I
think I let go of the DSP too soon.  I suspect there are times when the
NR would be of great benefit but I didn't live with it long enough to
really find out.

I'm currently running an external QF-1A and it works nicely.  I get all
the AF filtering I want, two notch filters and there's the added benefit
that it greatly improves the sound of my sidetone.

You asked about atmospheric and man-made noise.  I'm not sure either of
these will do much to take care of that stuff.  Static crashes still
come booming through, although with less audio bandwidth.  I think the
electrical noise is something you'd need an NB to deal with.

- Keith N1AS -
- K2 5411.ssb.100 -
- K3 Wave 3 - 

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of KBG Luxford
Sent: Sunday, September 30, 2007 9:59 PM
To: Elecraft
Subject: [Elecraft] K2 Reception Improvement - DSP or AF filter?

Now that my K2 is on the air (CW only until I assemble the SSB adapter)
I am thinking about some fruit salad.  The bands are pretty noisy at the
moment - atmospheric, touch lamps, fluorescents, electrical storms et
al.  Has anyone experience of both the K2 DSP and AF filter that could
offer a comparison?

Many thanks and 73
Kevin
VK3DAP / ZL2DAP
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