Icom IC-F121S Guide

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

ADJUSTMENT
Adjustment No. 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 Hi ANT Con
L2 Power 10.0W 10.0W L2
L1 Power 5.0W 5.0W L1
TX Output Check Check that the in-band TX output is within
the specifications below.
Hi Power 40.0~60.0W 40-60W ANT Con
L2 Power 20.0~30.0W 20-30W
L1 Power 4.0~6.0W 4.0-6.0W
Current Check at Check that the in-band power consumption
TX is within the specifications below.
Hi Power Less than 14.0A Less 14A
Checking Connect a spectrum analyzer to the ANT
Spurious terminal through an attenuator.
Set the attenuation so that the spectrum
Analyzer does not distort.
Set the transceiver to TX and when at Hi
power, check that spurious is less than the
value below in the bandwidth.
Spurious Less than –70dB of the Less than ANT Con
fundamental wave -70 dB

ADJUSTMENT
Adjustment No. 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.
HPF OFF
LPF 20 kHz
De-Emphasis OFF
Detector (P ±P)/2
Connect the modulation analyzer set at the
above conditions, through the attenuator to
the antenna terminal. Connect an oscillo-
scope, distortion meter and a level meter to
the modulation analyzer’s detection output
terminal.
Connect a millivolt meter or a 600 ohm out-
put impedance CR oscillator to the trans-
ceiver’s mic terminal.
Modulation Use the adjustment software to adjust the
Balance modulation analyzer’s detection output
Adjustment horizontal line so that it becomes a
Straight line as below
Adjust. Freq. Near Center Frequency
Detection Adj.Soft ANT Con
Output Balance
Deviation Set the CR oscillator to a 1 kHz sine wave,
Adjustment 40mVrms, and input from the external mic
terminal. Set the transceiver to TX and use
the adjustment software to adjust to the
following values.
Adjust. Freq. Near Center Frequency ±4.05 ~ Adj.Soft ANT Con
WIDE ±4.10 ±0.05 kHz ±4.15kHz MOD W
NARROW ±2.10 ±0.05 kHz ±2.05 ~ MOD
±2.15kHz Ratio

ADJUSTMENT
Adjustment No. 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 ±1.8 ~
±2.3kHz
Checking Modula-Check that the modulation in the bandwidth
tion is as the value below
WIDE/NARROW 2.8 ~ 6 mV rms 2.8-6mV ANT Con
WIDE:±3 KHz DEV ; NARROW:±1.5 KHz DEV rms
CTCSS Deviation Connect a linear detector via the attenuator
Adjustment to the antenna terminal, Set the transceiver
to wide ch and CTCSS 151.4Hz.
Transmit while making sure no input is
applied to the mic (or mic terminal)
Adjust. Freq. Near Center Frequency Adj.Soft ANT Con
WIDE ±0.7 kHz ±0.7kHz CTCS/DTCS
Checking CTCSS/ then reset so that each signaling type
DTCS/2/5 TONE/ can be output.
DTMF DEVIATION DTCS CODE 007
CTCSS 151.4 Hz
5 TONE CCIR 11111
DTMF # (Auto Dial Setting)
2 TONE 349.0 Hz
check that each version in it’s bandwidth
is as the values below, respectively.
Wide CTCSS/DTCS ±0.50~±0.90kHz ±0.5-0.9kHz ANT Con
Wide 2/5 TONE/ ± 2.40~±3.60kHz ±2.4-3.6kHz
DTMF
Narrow CTCSS/DTCS ±0.25~±0.45kHz ±.25-.45kHz
Narrow 2/5 TONE/ ±1.20~±1.80kHz ±1.2-1.8kHz
DTMF

ADJUSTMENT
Adjustment No. 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.
HPF 50 Hz
LPF 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
oscillator output level so that the maximum
modulation is 70%.(WIDE:3.5KHz,NAR:1.75KHz)
Check that the TX S/N in the bandwidth is
as the values below.
WIDE More than 40 dB Over 40dB ANT Con
NARROW More than 34 dB Over 34dB
Adjusting RX When there is no particular set limits, set
Sensitivity the RX adjustments and signal generator
when checking to the settings below.
Modulation Freq. 1kHz
WIDE ±3.5 kHz
NARROW ±1.75 kHz
Set the signal generator in the following
way for wide channels.
Adjust Freq. Near Greatest Lo band F.
SG Input level +20 dBu
Connect an 4 ohm non-inductive load and Adj.Soft RSSI line
a distortion meter to the external speaker
terminal. Adjust BPF (T1) ~ (T2) with the
adjustment software, so that the sensitivity
is at maximum.

ADJUSTMENT
Adjustment No. 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
channels also.
Adjusting the set the transceiver to the RX frequency
Squelch bandwidth’s narrow band center frequency.
Set the signal generator to the settings
below. A NT Con
Modulation Freq. 1kHz
WIDE ±3.5 kHz
NARROW ±1.75 kHz
SG Output Level -16.5 dBu
In this condition, using the adjustment Adj.Soft
software, raise the squelch D/A value until SQL
the squelch closes once, then lower the D/A
value again, and adjust until the squelch
opening point.
Checking Squelch Check that the squelch opening point value
Sensitivity in the RX frequency bandwidth is as below.
Squelch Sensitivity Less than –10 dBu Less-10dB ANT Con
Next, reduce the signal generator output
and check that the squelch closes in the RX
bandwidth.

ADJUSTMENT
Adjustment No. 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%.
Check that the AF output value at this point
as below.
Over ANT Con
AF Output More than 3.5 W 3.5 W SP Jack
@ 4 ohm
load
Checking RX S/N Set the signal generator output level to
+60 dBu. Adjust the AF volume so that the
AF output is 50% of the rated value.
Check that the RX S/N in the bandwidth is
as the values below.
WIDE More than 40 dB Over 40dB ANT Con
NARROW More than 34 dB Over 34dB SP Jack
Checking Set the signal generator output to +60 dBu
Howling as in RX adjustment, and for non modulation. ANT Con
set the internal speaker for operation, Int SP
and turn the AF volume up to maximum to
check that howling does not occur.
Checking While still in the AF output check status,
Maximum rotate the volume control clockwise to
RX Current obtain the maximum AF output. Check that the
current consumption at this time is as the
value below.
Max. RX Current Less than 1200 mA Less than PWR Con
1200mA