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Filter Presets (I/II)
Each operating mode provides two ‘floating’ filter
presets, I and II, which store filter settings on a
per-VFO, per-mode basis (excluding FM). They are
updated continuously as you change filter settings.
(Fixed, per-mode ‘normal’ settings are also
available; see below.)
You can alternate between the I and II settings by
holding I/II . This is especially useful when you’re
using wide and narrow settings during contest or
DX operation.
The I and II settings for VFOs A and B are
independent.
Filter Normalization (NORM)
Standard Settings
To get quickly to a standardper-mode bandwidth
and reset any passband shift or cut, hold N OR M
(normalize). The normalized bandwidth is 400 Hz
in CW and DATA modes, 2.7 or 2.8 kHz in SSB
modes, and6 kHz for AM.
Whenever you normalizethe filter passband,
two small "wings" appear at the left andright ends
of the DSP filter passband graphic as shown below.
Moving any DSP control makesthe "wings"
disappear, asa reminder that the passband is no
longer normalized.
Custom Settings (NORM1 and NORM2)
In addition to the K3's standard "NORM" values,
you can save two of your own setups in each mode,
then recall them usingthe NORM function. These
setups are referredto as NORM1 and NORM2.
To save a custom normalization setting:
set up the filter passband as desired for the
current mode
hold NOR M until you see <
-
SAV
-
> (3
seconds)
rotate the knob slightly left or right to save it as
NORM 1 or NORM2.
The arrows to the left and right of SAV are a
reminder that you can rotate the knob to get to the
two user-definednormalization settings.)
To recall, hold NORM until you see <
-
NOR
-
>
(about 1/2 second),then rotate the knob left or right
to recall NORM1 or NORM2.
Narrow DSP Filter Types
For bandwidth settings of 100 Hz or lower, the K3’s
DSP normally uses a type of filter that minimizes
ringing: the Finite Impulse Response or FIR filter.
If you’d like steeper filter skirts, and don’t mind a
small amount of ringing, you can select Infinite
Impulse Response” or IIR filters for these
bandwidths. Locate CONFIG:FLx BW menu entry,
then tap 7 until you see IIR ON. Both main and
sub receivers will use the same setting.
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