Icom IC-7851 Instruction Manual page 102

D Vector indicator and Waterfall display
You can fine tune the PSK signal using the Vector tun-
ing indicator and waterfall display.
q
Slowly rotate the [MAIN DIAL].
• When a PSK signal is received, the vertical line appears
on the waterfall display.
w
Tune the vertical line to the Center of the waterfall
display.
• The signal is properly tuned when the radiated lines in
the vector tuning indicator narrow, as shown below to the
right.
• Vector tuning indicator
The Vector tuning indicator is displayed when tuning
the signal.
• Waterfall display
Displays the band activity as a waterfall.
If the two or more signals are in the band, tune the
displayed signal to the 1500 Hz tone.
PSK decode screen
•
Vector tuning indicator
• Indication example
Tuned BPSK signal
BPSK/QPSK idle signal
Vector tuning indicator
5-25
RECEIVE AND TRANSMIT
Waterfall
Tuned QPSK signal
Unmodulated signal
FFT scope
Waterfall
5