5-8
5.4 Measurement
CAUTION: Do not turn any adjusters until you understand their functions. Use
calibrated measuring instruments.
1. Frequency Adjustment
Note)
Allow a frequency counter for enough warm-up time.
1. Turn on the FS-1503, and leave it for more than 3 minutes.
2. Connect a frequency counter to 2
nd Local oscillator output, TP3 (H) and TP4 (C) on
the TX/RX board.
3. The reading must be 54 MHz
±
10 Hz. If not, adjust C554.
FAN
VCO
DDS
TX/RX Board
(05P0666)
C554: Freg. Adj.
Y501: REF. X'tal 36.0 MHz
TP4 (GND)
TP3 (54 MHz)
Front Panel
U25 (NB PCB)
Figure 5-2 Frequency Adjustment
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