I Fsk Operation - Icom IC-M801GMDSS Instruction Manual

4
RECEIVE AND TRANSMIT
I Functions for receive (continued)
D D Clarity control
Voice signals received from other stations may be diffi-
cult to receive. This may sometimes happen if a sta-
tion is transmitting slightly off frequency. In such cases,
you can compensate by using the clarity control.
q Push [F] then [RX
and OFF.
• "CLAR" and shifting value with direction appear.
w Rotate [CH] to improve the audio readability.
• Adjustable between ±150 Hz in 10 Hz steps.
D D Tuner through function
In the combination with IC-M801GMDSS and optional
AT-141, the tuner through function can be used.
By bypassing the tuner unit, the receiver gain in par-
ticular frequency band may be improved depending
on your antenna element length.
➥ While "TUNE" is displayed, push [F] then
[TUNE ] to tuner through function ON.
THRU
• "THRU" appears instead of "TUNE" indicator.
• Push [TUNE
THRU

I FSK operation

The transceiver has F1B and J2B modes for FSK op-
eration— use F1B when using the built-in oscillator;
use J2B when using an AFSK terminal unit.
q Connect an FSK terminal unit to the [AF/MOD]
socket as shown at right.
w Select the desired channel to operate FSK mode.
• FSK ITU channel group, Ch 4001 to Ch 25040, are only
available when SITOR CH setting is set to ON. (p. 48)
e Push [MODE
SET
(FSK) or J2B (AFSK).
r Operate the FSK terminal unit.
NOTE:
➥ FSK tone, shift frequency and FSK polarity can
be adjusted in initial set mode (p. 50)
➥ Some transceivers may operate 1.7 kHz higher
than the IC-M801GMDSS's J2B mode even
when the same displayed frequencies are in use.
12
] to switch the function ON
CLAR
] to turn the function OFF.
] several times to select F1B
[CH]
[TUNE
FSK terminal unit connection
To pin 5
To pins 3, 4
5 1
To pin 6
To pin 9
9 6
[F] [RX ]
CLAR
] [F]
THRU
Tx/Rx control
AF ground
AF input
FSK keying
Ground
FSK terminal unit