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Icom IC-F121S Adjustment
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Icom IC-F121S Adjustment

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

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Summary of Contents for Icom IC-F121S

  • Page 1 Adjustment for IC-F121S ADJUSTMENT Adjustment 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.
  • Page 2 ADJUSTMENT Adjustment Adjustment Condition & Tuning Value Ref. No. CK. Point TX Output Use adjustment software to adjust the adjustment output to the values below. Adj.Soft Adj. Freq. Greatest Low Band Freq. Power Hi Power 50.0W 50.0W ANT Con L2 Power 10.0W 10.0W L1 Power...
  • Page 3 ADJUSTMENT Adjustment Adjustment Condition & Tuning Value Ref. No. CK. Point Preparation for When there is no particular set limits, set Checking Modula- the modulation analyzer for adjustment and tion Adjustment checking as below. 20 kHz De-Emphasis Detector (P ± P)/2 Connect the modulation analyzer set at the above conditions, through the attenuator to the antenna terminal.
  • Page 4 ADJUSTMENT Adjustment Adjustment Condition & Tuning Value Ref. No. CK. Point Checking Check that the deviation in the bandwidth Deviation is as the values below. ± 3.6 ~ ANT Con WIDE ± 3.60 ~ 4.50 kHz ±4.5kHz NARROW ± 1.80 ~ 2.30 kHz ±...
  • Page 5 ADJUSTMENT Adjustment Adjustment Condition & Tuning Value Ref. No. CK. Point Checking TX S/N Connect a linear detector via the attenuator to the antenna terminal, and set to the conditions below. 50 Hz 20 kHz De-emphasis OFF Level Meter (P/P)/2 Apply a 1 kHz signal from the low frequency oscillator to the mic terminal, and transmit, then adjust the low frequency...
  • Page 6 ADJUSTMENT Adjustment Adjustment Condition & Tuning Value Ref. No. CK. Point Checking RX Check that the signal generator level when Sensitivity the RX frequency bandwidth becomes 12 dB SINAD, is the value below. RX Sensitivity Less than -10 dBu Less-10dB ANT Con SP Jack Use the same check method for Narrow...
  • Page 7 ADJUSTMENT Adjustment Adjustment Condition & Tuning Value Ref. No. CK. Point Checking Set the signal generator output level to AF Output +60 dBu. The transceiver and SG connection is the same as the squelch adjustment above. Adjust the transceiver volume until the distortion meter reads 5%.