Yaesu FT DX 9000D TFT, Operation Manual, Page: 21 / 52

FT
DX
9000 TFT O
PERATION
M
ANUAL
A
UDIO
S
COPE AND
O
SCILLOSCOPE
U
SING THE
A
UDIO
S
COPE
The Audio Scope is particularly useful when making adjustments to the transmitter, especially when setting up
the Speech Processor as well as the Parametric Microphone Equalizer.
On receive, you can observe the signal characteristics and quality of the incoming signal, as well. In the case of
the Waterfall display, this can be used for precise frequency alignment of incoming signals to correspond with
filters used in your computer’s sound card or modem. The sweep time (speed) of WF-2 is faster than WF-1, and
you can choose the sweep most appropriate for your operating application.
1. By pressing the [ F2
](
MODE
) key, the Waterfall
mode can be modified. The available selections
are:
NORMAL WF-1 WF-2 NORMAL ......
NORMAL is a regular spectrum display.
WF-1 and WF-2 are Waterfall displays, with WF-
2 utilizing a faster sweep time than the WF-1 se-
lection.
2. Pressing the [ F3
](
SOURCE
) key lets you select
the source for the audio to be viewed by the Audio
Scope. The selections are:
VFO-A VFO-B EXT VFO-A ......
Advice : When EXT is selected, you can observe
the audio wave form of a signal provided by equip-
ment connected to the
AUDIO IN jack on the rear
panel of the transceiver.
3. Press the [ F4
](
ATT
) key to change the setting for
the attenuator. The available settings are:
0.3 V 0.1 V 1.0 V 0.3 V ......
Advice : By using this feature, you can conveniently
monitor the status of the CONTOUR filter, the perfor-
mance of the IF Notch, and the WIDTH/SHIFT sta-
tus.
W
ATERFALL
D
ISPLAY
S
PECTRUM
D
ISPLAY
A
UDIO
S
COPE
S
PECIFICATIONS
Frequency Range : 100 Hz - 4 kHz
Frequency Resolution : 20 Hz (Approx.)
Display Range : 80dB (Approx.)
Signal Processing : FFT (Fast Fourier Transformation)
Input Level : 1 Vp-p Input (ADC Max. value)
Attenuator : @0 dB, top edge;
@10 dB, 1 division of shift;
@20 dB, 2 divisions of shift
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