Furuno FS-2570 - Page 170

5.8 Antenna coupler, AT-1560
5-53
TUNE OK
Using L7, L8 o
r
L9?
YES
NO
OK?
Insert parallel capacito
r
and retune.
(50 pF, 100 pF, 150 pF)
Insert shortening
capacitor.
Calculate antenna capacitance.
CA > 40 pF
Calculate antenna voltage.
If high, insert parallel capacitor.
Antenna
voltage<6 kV
Frequency
>
3.36 MHz?
TUNE ERROR
SWR< 2.0?
(MF band: SWR< 3.0)
(a)
(b)
OK?
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
TUNE OK
NO
YES
(c)
Gamma matching
Retry gamma matching.
(To find out minimum SWR point,
make a large change.)
SWR < 2.0?
(MF band: SWR< 3.0)