Operating PSK
A high-quality DSP-based PSK encoder/decoder is built
into the IC-7851. You can connect a keyboard to the
transceiver and operate PSK without a PC. (p. 3-6)
This transceiver can be used in the PSK31 and PSK63
modes.
If you would rather use your PSK software, consult the
software manual.
Before transmitting, monitor your selected operating
frequency to make sure you don’t cause interference
to other stations on the same frequency.
Connect a keyboard to the [USB A] port on the rear
panel:
The Multi-function screens are OFF:
Push a band key to select a desired band. q
Push the Mode key [RTTY/PSK] to select the PSK- w
mode.
• After the PSK mode is selected, hold down [RTTY/
PSK] for 1 second to toggle between PSK and PSK-R
modes.
• “PSK” or “PSK-R” is displayed.
Push [DECODE](F). e
• The PSK decode screen is displayed.
r Rotate [MAIN DIAL] to tune the desired signal.
• The signal is properly tuned when the radiated lines in
the vector tuning indicator narrow, as show in the ex-
ample on page 5-25.
• The radiated lines in the vector tuning indicator may be
sporadically displayed.
• When a PSK signal is received, the waterfall display is
activated.
• The waterfall display shows the signal condition within
the passband and a vertical line appears when a PSK
signal is received.
Rotate [RF PWR] to adjust the output power. t
• The TX power readout displays the setting level.
Push the Multi-function [METER]( y ) key to select
the ALC meter.
u
Push [F12] on the keyboard to transmit.
• The [TX] indicator lights red.
Rotate [DRIVE] to adjust the Drive gain. i
• Adjust the Drive gain so that the ALC meter reading
swings within 30 to 50% of the ALC scale.
• If the ALC meter reading goes outside the ALC zone, the
TX distortion occurs and the readability on the receiver
side may be reduced.
Type on the keyboard to enter the message that you o
want to transmit.
• The typewritten message is displayed in the TX buffer
screen and immediately transmitted.
• The text color will change when transmitted.
• Push one of [F1]–[F8] to transmit the TX memory con-
tents.
!0 Push [F12] on the keyboard to return to receive.
Mode icon
TX power readout
Mode keys [MAIN DIAL]
() Multi-function keys
[DRIVE]
[RF PWR]
TX indicator MAIN
Band keys
For your convenience
A PSK message can be typed before being transmitted.
Do steps q q to r above and to the left.
Type from the keyboard to enter the message that w
you want to transmit.
• The typewritten contents are displayed in the TX buffer
screen.
Push [F12] on the keyboard to transmit the typewrit- e
ten contents.
• The color of displayed text in the TX buffer screen, will
change when transmitted.
• To cancel the transmission, push [F12] twice.
Push [F12] on the keyboard to return to receive. r
For your convenience
When an external keypad is connected, the preset con-
tents, PT1 ~ PT4 or PT5 ~ PT8, can be transmitted.
See pages 3-6 and 15-16 for details.
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