DMU-2000 D
ATA
M
ANAGEMENT
U
NIT
Page 27
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 equipment
connected to the
AUDIO IN
jack on the rear panel of
the
DMU-2000
.
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 moni-
tor the status of the CONTOUR filter, the performance
of the IF Notch, and the WIDTH/SHIFT status.
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
[
F2
(
MODE
)]
Key
[
F4
(
ATT
)]
Key
[
F3
(
SOURCE
)]
Key
