Icom IC-7851 Instruction Manual page 104

D About the BPSK and QPSK modes
The BPSK and QPSK modes are selectable in the
PSK31 mode.
• The BPSK (Binary Phase Shift Keying) mode is the
most commonly used mode.
• The QPSK (Quadrature Phase Shift Keying) mode
has error correction capability to provide better de-
coding than the BPSK mode in marginal conditions.
However, more accurate tuning is required with
the QPSK mode, due to the tight phase margin of
QPSK.
q
Display the PSK decode screen, then push
[<MENU1>](F).
DECODE [F-3]  <MENU1> [F-1]  Displays <MENU2>
• The function menu changes to Menu 2.
Push [B/QPSK](F).
w
• Toggles between the BPSK and QPSK modes.
D About the BPSK31 and BPSK63 modes
The BPSK31 and BPSK63 modes are selectable for
the BPSK mode.
q
Display the PSK decode screen, then push
[<MENU1>](F).
DECODE [F-3]  <MENU1> [F-1]  Displays <MENU2>
• The function menu changes to Menu 2.
w
Push [31/63](F).
• Toggles between the BPSK31 and BPSK63 modes.
• When the QPSK mode is selected, the BPSK63 mode
cannot be selected.
(F) Function keys
• PSK decode screen (MENU2)
"
(F) Function keys
• PSK decode screen (MENU2)
5-27
RECEIVE AND TRANSMIT
[EXIT/SET]
" or " " is displayed
[EXIT/SET]
" " or " " is displayed
5