Adjustment; Tx Power Adjustment; Frequency Adjustment - Furuno FS-1562 Manual

3. Adjustment

3.1 Tx Power Adjustment

Item Rating
High Power 20 to 25 W
Low Power Loss than 1 W
Hot Power 6 to 8 W
Note)
Hot power;
It reduces the power automatically to 6 to 7 w when the temperature at the power
amplifiers exceeds 100 degrees (actually 85 degrees) "HI" indication blinks when power
is reduced.
TX Board
To check "HOT"
power,remove RT1
at solder side.
C67

3.2 Frequency Adjustment

TX Freq. on CH16 (Rating)
156.8 MHz±300Hz
(Rule: ±10ppm)
If the frequency is out of the rating, adjust C67 on TX Board to correct.
(Adjust to PLL reference OSC: 8 MHz )
Check Point
ANT connector
MAIN UNIT
PA
RT1
R56 [Low]
R54 [High]
R53 [Hot]
VCO
Frequency ADJ.
Conditions
PTT: ON
E3-8
Adjuster
R54 CH16, Power: HI
R56 CH16, Power: LOW
CH16, Power: HI
R53 (Temporarily disconnected lead
wire of posistor RT1.)
Pick up
Power
meter
ANT
Frequency
Counter
Power ADJ.
Adjuster
C67
(TX Board)
FM-8000
Condition