[Elecraft] K3 Auto Notch distortion

[Fred Smith]

Well truth be told I have been using my first K3/# 5299 since July of last
it was a basic model I bought used, then a fully loaded one K3/# 6730 I
bought the last 1/4 of 12.

I have not really noticed this all that much it does what I want it to
remove carriers most of all. But what do I know I only listen to the 8-12
hrs a day in my spare time the rest I listen to my KX3, K2, IC-9100 or one
of my old FT-101 lines of radios now 4 of those 8>).

But since I sold my FTDX-5000MP that I owned for 2 years 90+% of my time has
been spent using my K3's although sometimes it is hard to figure which
Elecraft radio I want to use that day.

Fred/N0AZZ

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bill Clarke
Sent: Tuesday, March 12, 2013 5:32 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 Auto Notch distortion

It is more than barely noticeable or you would not have mentioned it!  I too
have noticed it and it really bugs me - very unlike the fine auto-notch
filters found on the Kenwood, Icom, and Yaesu rigs. The nay sayers in this
group will quickly tell you they don't hear it or give excuses for its
existence. Don't buy into it - the distortion does exist and it is very
annoying. To me, there is no excuse for the notch filter distortion to exist
on the expensive K3 - when it does not exist on
$1000 rigs.

As a work around, I have found the following settings go a long way to
eliminate the distortion. Be advised - these settings are for armchair copy
on 75, 40, and 160 meters. I don't know if they would do well for contesting
or DXing - of which I do neither.

**K3 settings (Config Menu):
     AGC DLY - NORM
     AGC HLD - 0
     AGC PLS - NORM
     AGC SLP - 4
     AGC THR - 12
     AGC F -       120
     AGC S -       20
     Shift -          1.4
     Width -        2.7
     RF Gain -    90
     ATT -           ON
     RX EQ         1         -2
                          2        0
                          3        +9
                          4        +12
                          5        +11
                          6        +14
                          7        -16
                          8        -16

Be sure to read the "Noisy K3" section on http://www.w3fpr.com/ - excellent
information!

The disclaimer:  Your mileage for the above settings may vary - depending
upon speaker selection, personal preferences, and your hearing acuity.

Note:  I made all of my settings by hand, using the K3 menus. I did NOT use
K3 EZ as that program will sometimes upset the AGC settings.


**
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