Icom IC-F520 Mode d’emploi

Adjustment for IC-F520

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 during

each test.

Lock Voltage Set the transceiver to the 136 MHz

Adjustment and set the LV voltage as follows

C133 during RX, C134 during TX.

Adj. Freq. 136 MHz

RX Side 1.4V 1.4V C133 LV

TX Side 1.0V 1.0V C134

Lock Voltage Set the transceiver to the 174 MHz

Check and check that each value is within

following values.

Adj. Freq. 174 MHz

RX Side 3.5V~4.5V 3.5V-4.5V LV

TX Side 3.0V~4.0V 3.0V-4.0V

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 following values.

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 following values.

Adj.Soft

Adj. Freq. Greatest Low Band Freq. Power

Hi Power 25.0W 25.0W Hi ANT Con

L2 Power 10.0W 10.0W L2

L1 Power 2.5W 2.5W L1

TX Output Check Check that TX output is within the following

value in the range of frequency coverage.

Hi Power 20.0~30.0W 20-30W ANT Con

L2 Power 8.0~12.5W 8-12.5W

L1 Power 2.0~3.0W 2.0-3.0W

Current Check at Check that the Hi Power current is less than

TX the following value in the range of

frequency coverage.

Hi Power Less than 7.0A Less 7.0A

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 at Hi power,

check that spurious is less than the

following value in the range of frequency

coverage in the bandwidth.

Spurious Less than –70dB of the Less than ANT Con

carrier power -70 dB

ADJUSTMENT

Adjustment No. Adjustment Condition & Tuning Value Ref. No. CK. Point

Preparation for During the measurements, set the modulation

checking modula- analyzer as follows when there is no

tion adjustment specific requirement.

HPF OFF

LPF 20 kHz

De-Emphasis OFF

Detector (P-P)/2

Connect the modulation analyzer after

setting 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 follows.

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 supply the signal to

the external mic terminal.

Turn 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 N

±2.15kHz

ADJUSTMENT

Adjustment No. Adjustment Condition & Tuning Value Ref. No. CK. Point

Checking Check that the deviation in the range of

Modulation frequency coverage is following values.

± 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 range of

tion frequency coverage is as follows.

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 88.5Hz.

Transmit the transceiver with no input 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/ Set the transceiver with following signaling

DTCS/2/5 TONE/ type to perform the measurements.

DTMF DEVIATION DTCS CODE 007

CTCSS 88.5 Hz

5 TONE CCIR 11111

DTMF # (Auto Dial Setting)

2 TONE 349.0 Hz

check that each version in the range of

frequency is following values, 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~± 0.50kHz

±.25-.50kHz

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

following conditions.

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 that the

deviation is 70%(WIDE:3.5KHz,NAR:1.75KHz)

of the maximum permissible deviation.

Check that the TX S/N in the range of the

Frequency coverage is more than

the following values.

WIDE More than 40 dB Over 40dB ANT Con

NARROW More than 34 dB Over 34dB

Adjusting RX during the measurements set the signal

Generator as follows when there is no

special requirements.

Modulation Freq. 1kHz

WIDE ± 3.5 kHz

NARROW ± 1.75 kHz

Turn the transceiver wide channel and set

the signal generator as follows.

Adjust Freq. The lowest frequency

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) ~ (T4) with the

adjustment software to gain the maximum

sensitivity.

ADJUSTMENT

Adjustment No. Adjustment Condition & Tuning Value Ref. No. CK. Point

Checking RX Check that the signal generator level is as

Sensitivity follows when the distortion meter shows

12 dB SINAD in the range of

frequency coverage.

RX Sensitivity Less than -10 dBu Less-10dB ANT Con

SP Jack

Use the same check method for Narrow

channels also.

Adjusting the This Adjustment should be perform after the

S3 LEVEL RX sensitivity adjustment finished.

Set the signal generator following setting

for wide channels.

Adjust Freq. Near 136 MHz

SG Input level +23 dBu

Modulation Freq. 1kHz

WIDE ± 3.5 kHz

S3 SET COMMAND with the Adjustment soft Adj.Soft ANT Con

ware. S-METER

S3 Level

Adjusting the

Set the signal generator level to the

S1 LEVEL following value.

SG Output Level -7 dBu

S1 SET COMMAND with the Adjustment soft Adj.Soft ANT Con

ware. S-METER

S1 Level

ADJUSTMENT

Adjustment No. Adjustment Condition & Tuning Value Ref. No. CK. Point

Adjusting the turn the transceiver to the narrow channel

Squelch at center frequency.

Set the signal generator to as following.

ANT Con

Modulation Freq. 1kHz

WIDE ± 3.5 kHz

NARROW ± 1.75 kHz

SG Output Level -14 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 range of frequency condition

is as follows.

Squelch Sensitivity Less than –10 dBu Less-10dB ANT Con

Next, reduce the signal generator output

and check that the squelch closes

in the range of frequency condition.

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

Is 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 reaches 50% of the rated value.

Check that the RX S/N in the range of

frequency is as following values.

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 with no deviation. 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

following value.

Max. RX Current Less than 1200 mA Less than PWR Con

1200mA

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