Shift; Width; Notch - Yaesu FT-710 Operation Manual

1. SHIFT

1. Press the [STEP • MCH /
2. Rotate the [STEP • MCH /
"SHIFT", then press the [STEP • MCH /
(The function may also be selected by touching
"SHIFT".)
The shift frequency blinks.
3. Rotate the [STEP • MCH /
right to reduce interfering signals.
4. Press the [STEP • MCH /
the [DSP RESET] key or wait for about 5 seconds to
save the setting.
Press and hold the [STEP • MCH /
quickly move the filter passband to center.
Refer to Figure "A" and notice the depiction of the
IF DSP filter as a thick line in the center of the
passband. In Figure "B", you can see the effect of
rotating the [STEP • MCH /
The interference level is reduced by moving the fil-
ter passband so that the interference is outside of
the passband.
A
Desired Signal
QRM
IF BANDWIDTH

2. WIDTH

1. Press the [STEP • MCH /
2. Rotate the [STEP • MCH /
"WIDTH", then press the [STEP • MCH /
knob. (The function may also be selected by touch-
ing "WIDTH".)
The filter bandwidth blinks.
3. Rotate the [STEP • MCH /
er-clockwise to narrow the bandwidth and reduce
interference.
4. Press the [STEP • MCH /
the [DSP RESET] key or wait for about 5 seconds to
save the setting.
Press and hold the [STEP • MCH /
reset the digital filter bandwidth to its initial value.
The default bandwidths, and total bandwidth adjust-
ment range, will vary according to the operating mode
(see table below).
Operating Mode
LSB / USB 300Hz - 4000Hz (default: 3000Hz)
CW-L / CW-U
50Hz - 4000Hz (default: 500Hz)
RTTY-L / RTTY-U
DATA-L / DATA-U
50Hz - 4000Hz (default: 600Hz)
PSK
AM / FM-N / D-FM-N
AM-N
FM / DATA-FM
] knob.
] knob to select
] knob.
] knob to the left or
] knob, then press
] knob to
] knob.
B
Desired Signal
QRM
IF BANDWIDTH
] knob.
] knob to select
]
] knob count-
] knob, then press
] knob to
IF BANDWIDTH
9000Hz
6000Hz
16000Hz
The figure below is a conceptual diagram of
WIDTH.
IF BANDWIDTH
STEP MCH/
•

3. NOTCH

1. Press the [STEP • MCH /
2. Rotate the [STEP • MCH /
"NOTCH", then press the [STEP • MCH /
knob.
(The function may also be selected by touching
"NOTCH".)
The NOTCH center frequency blinks.
3. Rotate the [STEP • MCH /
"null" position of the Notch filter.
4. Press the [STEP • MCH /
the [DSP RESET] key or wait for about 5 seconds to
save the setting.
Press and hold the [STEP • MCH /
return the center frequency to its initial value.
The bandwidth of the NOTCH filter (either
narrow or wide) may be adjusted using Menu
item "IF NOTCH WIDTH" (page 92).
The factory default setting is "WIDE".
The performance of the IF Notch filter is shown
in Figure "A", where the effect of rotation of the
[STEP • MCH / ] knob is depicted. In Figure
"B" you can see the notching effect of the IF Notch
filter as you rotate the [STEP • MCH /
to eliminate the incoming interference.
A
Notch QRM (Heterodyne)
IF BANDWIDTH
STEP MCH/
•
knob
] knob.
] knob to select
]
] knob to adjust the
] knob, then press
] knob to
] knob
B
Desired Signal
IF BANDWIDTH
knob
33