Specifications
DMU-2000 DATA MANAGEMENT UNIT Page 27
AUDIO SCOPE AND OSCILLOSCOPE
USING THE AUDIO SCOPE
The Audio Scope is particularly useful when making adjustments to the transmitter, especially when setting up the Speech
Processor and the Parametric Microphone Equalizer.
On receive, you can observe the signal characteristics and quality of the incoming signal. The Waterfall display 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
[
KEY2
(
MODE
)]
key repeatedly, the
Audio Scope mode can be changed. The available se-
lections 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.
2. Pressing the
[
KEY3
(
SOURCE
)]
key repeatedly, se-
lects the source of the audio to be viewed on the Au-
dio 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 external
equipment connected to the AUDIO IN jack on the
rear panel of the DMU-2000.
3. Press the
[
KEY4
(
ATT
)]
key repeatedly, to change the
setting for the attenuator. The available settings are:
0.3 V
0.1 V
1.0 V
0.3 V
......
WATERFALL DISPLAY
SPECTRUM DISPLAY
AUDIO SCOPE SPECIFICATIONS
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
[
KEY2
(
MODE
)]
Key
[
KEY4
(
ATT
)]
Key
[
KEY3
(
SOURCE
)]
Key
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.
MANUAL
REFERENCE
[
KEY1
(
xxx
)]
[
KEY2
(
xxx
)]
[
KEY3
(
xxx
)]
[
KEY4
(
xxx
)]
[
KEY5
(
xxx
)]
[
KEY6
(
xxx
)]
[
KEY7
(
xxx
)]
[
KEY8
(
xxx
)]
FT-950
FTDX5000
[
1.8
(
1
)]
[
3.5
(
2
)]
[
7
(
3
)]
[
10
(
4
)]
[
14
(
5
)]
[
18
(
6
)]
[
21
(
7
)]
[
24.5
(
8
)]
FT-2000
FT-2000D
[
F1
(
CH-1
)]
[
F2
(
CH-2
)]
[
F3
(
CH-3
)]
[
F4
(
CH-4
)]
[
F5
(
MEM
)]
[
F6
(
DEC
)]
[
F7
(
P.BACK
)]
[
DISPLAY
]