Q & A
8-15
60. How to determine the power cable size
Select a cable on which the supply voltage drop is 5% or less. The following
equation can be used for the calculation of the cable size.
- Voltage drop: V
d
= K x r x I x L/1000
- Cable length: L = 1000 x V
d
/ K x I x r
K = Single phase DC, AC: 2 3 phase AC: 3
I = Amperage (A)
R = Resistance (ohm/km)
L = Cable length (m)
When TPYCY-2.5, for instance, is used a cable for power supply to the antenna
motor (220VAC/3 phase), the cable length that can contain the voltage drop
within 5% is:
Cable length: L = 1000 x V
d
/ K x I x r
L = 1000 x 11 / 3 x 3 x 7.41
L = 285 m
61. How to measure the frequency of the X-band radar
1) Select “TX” in [Menu] -> 0 -> 3 -> 6:ANT STOPPED.
2) Transmit by the long pulse and put a pickup antenna of the Cavity-frequency
meter closer to about 1 m to the front face of a slot antenna.
3) Turn the handle of the Cavity-frequency meter and find a point where the
indicator of the Cavity-frequency meter swings most.
4) Correct the direct-reading indication by means of a temperature compensating
cursor and read the frequency.
Note:
The maximum frequency error of the X-band radar is loss than ±55 MHz.
62. Can SC-60/120/50/110 be connected with the IMO-type radar for heading
data?
It can be connected to a ship in a range between 300 GT to 500 GT. Since it is
mandatory for a ship of 500 GT or more to be equipped with a gyrocompass,
input the data from the gyrocompass. It is OK to connect SC-60/120/50/110 for a
backup purpose.
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