Yaesu FT DX 3000 Operating Manual page 21

Hf/50 mhz transceiver
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F
ront
[ NOTCH ]
Switch
Pressing this button allows you to adjust the center
frequency of the IF Notch filter using the [ NOTCH ]
knob. While activated, the LED inside this button
glows orange. Press the [ NOTCH ] knob briefly to
toggle the IF Notch filter on/off.
[ NOTCH ] Knob
Press the [ NOTCH ] switch to turn the IF NOTCH
filter on or off. Rotate the inner [ NOTCH ] knob to
adjust the center frequency of the IF NOTCH filter.
The null position of the IF NOTCH filter can be
observed on the display. Furthermore, the display
will show the center frequency of the IF NOTCH
filter for 3 seconds whenever the [ NOTCH ] knob is
turned.
[ CONT/APF ] Knob
CONT
In the SSB, AM, and FM modes, press the [ CONT/
APF ] switch then turn the outer [ CONT/APF ] knob
to select the desired CONTOUR filter response. The
CONTOUR filter is engaged via the [ CONT/APF ]
switch.
APF
In the CW mode, press the [ CONT/APF ] switch and
then turn the outer [ CONT/APF ] knob to select the
desired APF (Audio Peak Filter) response. The APF
is engaged via the [ CONT/APF ] switch.
[ CONT/APF ] Switch
Pressing this button allows you to select the DSP
Contour filter response using the [ CONT/APF ]
knob. While activated, the LED inside this button
glows orange. Press the [ CONT/APF ] knob briefly
to toggle the IF Contour filter on/off.
In the CW mode, pressing this button will activate
the APF (Audio Peak Filter) which provides a very
narrow audio bandwidth. While activated, the LED
inside this button glows orange.
[ SHIFT Knob ]
( E
xcEpt on
Rotate the inner [ SHIFT ] to move the passband of
the IF DSP filter by 20 Hz steps. The total adjust-
ment range is ±1 kHz. The position of the passband
can be observed on the display. Furthermore, the
display will show the shift value of the IF SHIFT for
3 seconds whenever the [ SHIFT ] knob is turned.
[ WIDTH Knob ]
( E
xcEpt on
Rotate the outer [ WIDTH ] knob to set the overall
bandwidth of the IF DSP filter. Counter-clockwise
rotation reduces the bandwidth, while clockwise
rotation increases the bandwidth. The current band-
width can be observed on the display. Furthermore,
the frequency display will show the bandwidth of the
IF passband for 3 seconds whenever the [ WIDTH ]
knob is turned.
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[ BK-IN ] Switch
This button turns the CW break-in capability on and
off. While CW break-in is activated, the LED inside
this button glows orange.
[ AF ] Knob
The inner [ AF ] knob sets the receiver audio volume
level. Typically, you will operate with this control set
between the 9 o'clock and 10 o'clock positions.
[ RF/SQL ] Knob
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This control may be used to select between the "SQL"
and "RF GAIN" functions via the Menu Item "036
RF/SQL VR".
RF
The outer [ RF/SQL ] knob is the receiver RF gain
control, which adjusts the gain of the receiver RF
and IF amplifier stages. This control is normally left
in the fully clockwise position.
SQL
This knob sets the signal level threshold, below
which the receiver audio is muted, in all modes. It
is very useful during local rag-chews, to eliminate
noise between incoming transmissions. This control
is normally kept fully counter-clockwise (off), ex-
cept when scanning and during FM operation.
[ MONI ] ( Monitor ) Switch
This button enables the transmit monitor in all
modes. While activated, the LED inside this button
glows orange.
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When using headphones, the Monitor function is
very helpful while adjusting the Parametric Equal-
izer or other voice quality adjustments. The voice
heard in the headphones represents the transmitted
audio qualities.
witChes
Page 19

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