Icom IC-7610 Instruction Manual advanced - Page 30

PSK decoding, AFC/NET function, About the QPSK mode operation, PSK Tone Frequency, DECODE, AFC Range

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2. ADVANCED OPERATIONS Operating PSK (Continued) DDPSK decoding You can fine tune the PSK signal using the Vector tuning indicator and waterfall display. ••When a PSK signal is received, the vertical line appears on the waterfall display. ••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 on the previous page. LIf the two or more signals are in the band, slowly rotate MAIN DIAL to tune the displayed signal to the 1500 Hz tone. LYou can change the PSK tone frequency for receiving, in the following item. MENU » SET > Function > PSK Tone Frequency DDAFC/NET function The IC-7610 has an AFC (Auto Frequency Control) function which automatically tunes the PSK signal. It also has a NET function that transmits the PSK signal tuned using the AFC function. 1. Display the PSK DECODE screen. MENU » DECODE 2. Touch [AFC/NET]. ••Touching this key toggles between (AFC:ON), (AFC/NET: ON) or OFF (no icon). ••While the offset between the operating frequency and the PSK signal is displayed, touching [AFC/NET] for 1 second adds the offset frequency to the operating frequency. About the QPSK mode operation The QPSK (Quadrature Phase Shift Keying) mode has error correction capability to provide better decoding than the BPSK mode in marginal conditions. However, more accurate tuning is required, due to the tight phase margin of QPSK. LIf the received signal is not properly demodulated, try selecting the PSK-R mode. ••In the QPSK mode, the phase shift direction must be the same on both the transmit and receive sides. ••To receive the reverse direction signal, select the PSK-R mode to match the phase shift direction to the transmit side. AFC, NET icons Frequency offset (Example: 15 Hz) NOTE: ••The AFC function may not tune the signal properly when a weak PSK signal is received. ••The AFC tuning range is set to ±15 Hz by default. You can select set to ±8 Hz in the following item. MENU » DECODE > > SET > AFC Range 26

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26
2. ADVANCED OPERATIONS
Operating PSK (Continued)
D
PSK decoding
You can fine tune the PSK signal using the Vector
tuning indicator and waterfall display.
• When a PSK signal is received, the vertical line
appears on the waterfall display.
• 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 on
the previous page.
L
If the two or more signals are in the band, slowly
rotate
MAIN
DIAL
to tune the displayed signal to the
1500 Hz tone.
L
You can change the PSK tone frequency for
receiving, in the following item.
About the QPSK mode operation
The QPSK (Quadrature Phase Shift Keying)
mode has error correction capability to provide
better decoding than the BPSK mode in marginal
conditions. However, more accurate tuning is
required, due to the tight phase margin of QPSK.
L
If the received signal is not properly demodulated,
try selecting the PSK-R mode.
• In the QPSK mode, the phase shift direction must
be the same on both the transmit and receive
sides.
• To receive the reverse direction signal, select the
PSK-R mode to match the phase shift direction to
the transmit side.
MENU
»
SET > Function >
PSK Tone Frequency
D
AFC/NET function
The IC-7610 has an AFC (Auto Frequency Control)
function which automatically tunes the PSK signal. It
also has a NET function that transmits the PSK signal
tuned using the AFC function.
1.
Display the PSK DECODE screen.
NOTE:
•
The AFC function may not tune the signal properly
when a weak PSK signal is received.
•
The AFC tuning range is set to ±15 Hz by default.
You can select set to ±8 Hz in the following item.
MENU
»
DECODE
2. Touch [AFC/NET].
• Touching this key toggles between
(AFC:ON),
(AFC/NET: ON) or OFF (no icon).
• While the offset between the operating frequency and
the PSK signal is displayed, touching [AFC/NET] for
1 second adds the offset frequency to the operating
frequency.
AFC, NET icons
Frequency offset
(Example: 15 Hz)
MENU
»
DECODE > <MENU2> > SET >
AFC Range