Icom IC-F520 Guide

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