Adjustment for IC-F121S
ADJUSTMENT
Adjustment No. Adjustment Condition & Tuning Value Ref. No. CK. Point
Preparation Connect the transceiver by cloning cable
(OPC-1122) to a PC (IBM compatible) and
boot up the cloning software.
Check points Be sure to use a tester with more than 50
kohm/V internal resistance when making
each test.
Lock Voltage Set the transceiver to the 174 MHz
Adjustment and set so that the LV voltage is
C134 during RX and C133 during TX.
Adj. Freq. 174 MHz
RX Side 3.5V 3.5V C134 LV
TX Side 3.5V 3.5V C133
Lock Voltage Set the transceiver to the 136 MHz
Check and check that all is within specification.
Adj. Freq. 136 MHz
RX Side 0.9V~1.5V 0.9V-1.5V LV
TX Side 1.0V~1.6V 1.0V-1.6V
Frequency Connect a power meter or attenuator
Adjustment to the antenna terminal.
Loose coupling the antenna terminal
and frequency counter.
Set the transceiver to near the TX greatest
high band frequency and set the unit to TX.
Use adjustment software to adjust the TX
frequency to the values below.
Set Frequency Set Freq. ± 500 Hz ±500Hz Adj.Soft ANT Con
TXF
