Icom IC-F121S Mode d’emploi

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

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