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2. SSB RADIOTELEPHONE
2-3
2.3 Transmission
After selecting the class of emission and frequency, you can transmit by pressing the
PTT switch on the handset.
2.3.1 Transmission procedure
Maximum transmission power is achieved only when the antenna impedance and
transmitter impedance match each other. Because the antenna impedance changes
with frequency, antenna impedance matching with the transmitter impedance is done
with the antenna coupler. The antenna coupler automatically tunes the transmitter to
a wide range of different antenna lengths. The available range is;
Wire antenna 10 to 18 meters long (horizontal part)
Whip antenna eight meters long (Horizontal feeder is two meters or longer.)
Whip antenna 10 meters long
To initiate the tuning, do the following:
1. Press the PTT switch on the handset. Tuning is automatically adjusted at first
transmission after frequency is changed. For manual tuning, press the 0/TUNE
key on the RT screen. If tuning fails, the message "TUNE NG" appears and the
output power is automatically set to [LOW] (for FS-1575/2575) or [LOW2] (for FS-
5075).
2. Hold the handset close to your mouth, press the PTT switch and speak clearly.
Note: When tuning is initiated in the two control unit system, the screen of the idle con-
trol unit shows "OCCUPIED (CONTROLLER 1 (or 2))". In this case, only the
DISTRESS key is operative on the idle control unit.
2.3.2 How to change transmission power
To minimize possible interference to other stations, reduce the transmission power.
This should be done when using the transceiver in a harbor, near the shore or close
to communication partner (other ship).
1. Rotate the ENTER knob to select [HIGH], [MID], [LOW] (for FS-1575/2575),
[LOW1] (for FS-5075) or [LOW2] (for FS-5075) (whichever is displayed), then
push the knob.
HIGH
MID
LOW1
LOW2
HIGH
MID
LOW
For FS-5075
For FS-1575/2575
135°19
.
5900
'
E
34°42
.
2800
'
N
29


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