[Elecraft] K3S vs. K3

[Joe Subich, W4TV]

Be careful ...

With the relatively "gentle" AGC slope (AGC SLP = 4 to 6) and the
high levels of EQ "boost" in the midrange is will be very easy to
overdrive the speaker amplifier in the K3 - even with the AF Gain
low and an auxiliary external amplifier (amplified speakers).  A
sudden static crash or other strong pulse could damage the amplifier.

With shift = 1.25 and width = 2.7, the IF/DSP is configured for
a 100 - 2600 Hz response and the RX EQ to provides an additional
audio filter set for roughly 150 - 2800 Hz.  You would see similar
results by setting RX EQ to:
     1  (50 Hz)    -16
     2  (100 Hz)   -16
     3  (200 Hz)   - 6
     4  (400 Hz)   - 2
     5  (800 Hz)   - 3
     6  (1600 Hz)    0
     7  (2400 Hz)  - 6
     8  (3200 Hz)  -16
and not stress the K3 audio amplifier nearly as much.

73,

    ... Joe, W4TV


On 2015-05-17 9:03 AM, Bill wrote:
> *
>
> *Per request:
> *
>
> *Menu settings used at W2BLC for armchair copy on 160/75/40 meters:*
>
> *
>
> The following are the settings I am using on 40, 75, 160 for armchair
> copy (meaning very reduced hiss and no ANF warbling). My RX audio goes
> through amplified Behringer studio speakers with bass/treble adjustments.
>
> The speaker adjustments:  bass at 3 o'clock and the treble at 11 o'clock
>
> K3 settings (Config Menu):
>      AGC DLY - NORM
>      AGC HLD - 0
>      AGC PLS - NORM
>      AGC SLP - 4 to 6 (low setting reduces artifacts from the Automatic
> Notch Filter)
>      AGC THR - 12
>      AGC F -       120
>      AGC S -       20
>      Shift -          1.25
>      Width -        2.7
>      RF Gain -    90 (sometimes less)
>      ATT -           ON
>      RX EQ         1        -2
>                           2        0
>                           3        +9
>                           4        +12
>                           5        +11
>                           6        +14
>                           7        +7
>                           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.
>
> Bill W2BLC
>
> **
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