
Maintenance
4-2
4.1.2 Measuring
DSC/NBDP
AF
Measure the DSC or NBDP modulation frequency (1615 Hz/1785 Hz) as follows.
1) Connect the frequency counter to the external speaker output terminal (
φ
3.5-mm jack) on the rear
of the controller.
2) Open Menu F2.3.2 DSC/NBDP (AF).
3) Select the frequency to measure from 1615 Hz or 1785 Hz at 1. TX type.
4) Start outputting the AF signal by selecting Start at 2. Output and pressing ENT.
5) Measure the modulation frequency using the frequency counter.
6) Measure the other frequency following steps 3 through 5 above.
7) Check that the frequency is within the ranges below.
Rating
1615 Hz (Y): Within ±1 Hz of 1615 Hz
1785 Hz (B): Within ±1 Hz of 1785 Hz
8) After the measurement, stop the AF signal output by pressing ENT at Stop button of 2. Output.
4.1.3
Measuring the test tone
Measure the test tone (1500 Hz. Note: 1400 Hz for Korea mode) used in TEL mode as follows.
Note: Transmission occurs while outputting a test tone. Before measuring the test tone, always
check the radio frequency is free. Then perform that measuring for as short a time as
possible.
1) Connect the frequency counter to the external speaker output terminal (
φ
3.5-mm jack) on the rear
of the controller.
2) Press TEL key, and move the cursor to 1. TX band power adj. on the F2.3.1 TX power adj. menu,
and press ENT. The transmission output adjustment pop-up screen appears as shown to the right.
ENT
→
3) Set the frequency assigned to the ship, and set PWR to low to reduce the Tx power.
4) Check that Type is set to Test tone.
5) Move the cursor to [TX] and press ENT to start outputting a test tone.
6) Measure the test tone frequency using the frequency counter.
Содержание JSS-2150
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