Icom IC-905 - Spectrum scope screen

2
SCOPE OPERATION (ADVANCED)
2-2
Spectrum scope screen
D Adjusting the sweep speed
Select the sweep speed to change the FFT scope
refresh speed and the waterfall speed�
L To change only the waterfall speed, select “Slow,” “Mid,”
or “Fast” in the Waterfall Speed�
1� Display the SPECTRUM SCOPE screen�
»
SCOPE
2� Touch [< 1 >] to display MENU 2�
3� Touch [SPEED] several times until the desired
sweep speed is selected�
• Selectable speeds: FAST, MID, or SLOW
L “,” “,” or “” indicates FAST, MID, or SLOW�
L A popup window is displayed in the center of the
SPECTRUM SCOPE screen and displays the
selected sweep speed for 1 second�
“,” “,” or “” is displayed�
D Adjusting the Reference level
When monitoring a weak signal that is buried in the
noise oor, or monitoring a strong signal but some
stronger signals are nearby, adjusting the Reference
level of the screen helps you to see these signals�
• Even if this setting is changed, it does not a󰀨ect the input
signal level�
• When you adjust the Reference level, the signal strength
for the waterfall also appears to change�
L Each band memorizes the setting�
1� Display the SPECTRUM SCOPE screen�
»
SCOPE
2� Touch [< 1 >] to display MENU 2�
3� Touch [REF ]�
4� Rotate to adjust the level�
• Adjustable range: –20�0 dB ~ +20�0 dB
L You can reset to ±0�0 dB by touching [DEF] for 1
second�
5� To close the REF Level window, touch [REF]�
The di󰀨erence in the spectrum
Reference level
(+20�0 dB) (–20�0 dB)
+20�0 dB
–20�0 dB
±0�0 dB
L If you adjust this setting to a positive level, all signal
levels appear stronger� Or, if you adjust to a negative
level, all signal levels appear weaker�