Band Scope Function; D Sweep Operation - Icom ID-31A PLUS Advanced Manual

12
OTHER FUNCTIONS

Band Scope function

Use the Band Scope function to visually search for
a specified frequency range around the displayed
frequency� You can use this function to search for a
signal, and see the relative received signal strength
level�
The Band Scope function has 2 sweep types�
• Single Sweep: Searches the specified
frequency range only once�
The Single Sweep starts from
the lower frequency and the
sweep stops after reaching to the
upper frequency�
• Continuous Sweep: Repeatedly searches the
specified frequency range.
The transceiver's sweep bandwidth is ± 25 × the
tuning step number, centered on the operating
frequency�
L The ± 25 times is a fixed value.
Example:
The operating frequency is 433�000 MHz and
the tuning step is set to 20 kHz� Therefore, the
sweep range is between 432�500 MHz (lower edge
frequency) and 433�500 MHz (higher edge frequency)�
The calculation is as follows:
Lower edge frequency = –25 × 20 kHz
Higher edge frequency = +25 × 20 kHz
The operating (center) frequency is 433�000 MHz
The lower (start) frequency is 432�500 MHz
(= 433�000 MHz – 0�5 MHz)
The higher (stop) frequency 433�500 MHz
(= 433�000 MHz + 0�5 MHz)
Example: A strong signal is received on
432�990 MHz�
(Tuning step: 5 kHz)
Strong level
Weak level
Sweep marker
= –500 kHz (–0�5 MHz)
= +500 kHz (+0�5 MHz)
Center frequency
(Example: 433.000 MHz)
Band Scope
display

D Sweep operation

Example: Continuous sweeps centered on
433�000 MHz
1� Push [V/MHz] to enter the VFO mode�
2� Rotate [DIAL] to set 433�000 MHz�
3� Push [QUICK]�
4� Select "Band Scope�"
5� Select an option�
▼
• Returns to the frequency display and starts the
continuous sweep�
6� Push [ENT]�
• Stops the sweep�
L Push [ENT] again, to resume the sweep for the
Continuous Sweep function�
7� When the sweeping stops, rotate [DIAL] to move
the sweep marker to a detected signal�
• You can hear the signal audio�
L While the sweep is paused, push [CLR] to turn OFF
the Band Scope function�
TIP:
• If the tuning step is set too wide, the signals in
the sweep range may not be displayed (they
may be skipped), even if they are strong signals�
Therefore, we recommend that you set the tuning
step to 20 kHz or less to use the Band Scope
function� See BASIC MANUAL Section 3 for
details on how to set the tuning step�
• You can hear the displayed frequency's audio
during a sweep�
• You can turn OFF the audio output during a sweep
in the MENU screen� (p� 11-43)
(MENU > Sounds > Scope AF Output)
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