Self-Test - Furuno FS-1575 Service Manual

V = Ia × |Z|
Ia = P / (r + R)
|Z| = |R −jXL|≒ XL = 1/ωCa = ωL
Threshold of AT-1575 and AT-5075: 4.3 kVrms
In order to reduce voltage, i.e., to reduce inductance that negates the capacitive components
of the antenna, 50 pF and 100 pF capacitors are added on the antenna side to equivalently
increase the capacitive reactance of the antenna.
Memory
When matching results in VSWR of "not more than 3.0," the matching constant will be
saved in EEPROM. This constant is used as default for the subsequent matching data,
reducing a period of time required for matching.
The following section shows a range of frequencies to be saved. This is the range of
matching frequencies.
• Less than 1600 kHz:
• 1600 to 4000 kHz:
• 4000 to 8000 kHz:
• 8000 to 16000 kHz:
• 16000 to 28160kHz:
• Not less than 28160:

4. Self-test

AT-1575 and AT-5075 initiates a self-test when the [CHECK] button is pressed.
For details, refer to information on page 6-54.
Self-test procedure:
1) Turn OFF all relays.
2) Turn ON and OFF the input-side capacitor control relay, coil control relay, and
output-side capacitor control relay one after another.
3) Check for built-in ROM, RAM, and ADC of the CPU.
4) Upon completion of the self-test, the system will return to the original state.
CONFIDENTIAL (internal use only)
This confidential document is used only by FURUNO authorized persons.
It is strictly prohibited to reproduce the document in whole or in part without prior written permission of FURUNO.
Outside of setting range
20 kHz bandwidth (120 bands)
40 kHz bandwidth (100 bands)
80 kHz bandwidth (100 bands)
160 kHz bandwidth (78 bands)
Outside of setting range
7-76
7.9 Antenna Coupler
L
r ANT
r + jXL
Ca
Ia
Ra - jXCa
Ra
Va