Icom IC-R20 Service Manual

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Contents

Icom IC-R20 Service Manual Manual pdf 24 page image

5 - 25-2 SOFTWARE ADJUSTMENTSREFERENCEFREQUENCY[REF]CENTERVOLTAGEBFO[LSB][USB][CW]SSB-IFSHIFT[LSB-IFS][USB-IFS]1121231234• Connect the frequency counter to the check pointCP18 on the RF unit.• Receiving• Dual watch mode : ON• Set the receiver to [A-BAND] and FM mode.• Operating frequency : 145.100 MHz• Connect an SSG to the antenna connector and set asLevel : 1 mV* (–47 dBm)Frequency : 145.100 MHzModulation : OFF• Connect the Digital multimeter to the check point CP1on the RF unit.• Receiving• Set the receiver to [B-BAND] and FM mode.• Operating frequency : 145.100 MHz• Connect an SSG to the antenna connector and set asLevel : 1 mV* (–47 dBm)Frequency : 145.100 MHzModulation : OFF• Connect the Digital multimeter to the check point CP11on the RF unit.• Receiving• Connect the frequency counter to the check point onthe LOGIC unit (See page 5-3).• Receiving• Connect the frequency counter to the check point onthe LOGIC unit (See page 5-3).• Receiving• Connect the frequency counter to the check point onthe LOGIC unit (See page 5-3).• Receiving• Connect an SSG to the antenna connector and set asFrequency : 14.0990 MHzModulation : OFF• Receiving• Set an SSG asLevel : A+ 35 dBFrequency : 14.1005 MHzModulation : OFF• Receiving• Connect an SSG to the antenna connector and set asFrequency : 14.1010 MHzModulation : OFF• Receiving• Set an SSG asLevel : A+ 35 dBFrequency : 14.0995 MHzModulation : OFF• Receiving• Rotate [R-DIAL] to set to 247.05000 MHz.• Push [• LOCK] key.• Adjust L21 to CP1 voltage to be 1.0 V.• Adjust L105 to CP11 voltage to be 1.0 V.• Rotate [R-DIAL] to set to 448.5 kHz.• Push [• LOCK] key.• Rotate [R-DIAL] to set to 451.5 kHz.• Push [• LOCK] key.• Rotate [R-DIAL] to set to 449.2 kHz.• Push [• LOCK] key.• Set an SSG’s level to 10 dB S/N sensitivity (A).• Measure the AF output level while the IC-R20outputs 1 kHz signal (B).• Measure the AF output level (C).• If AF output level C is lower than B, skip thisadjustment.• If AF output level C is higher than B, rotate[R-DIAL] to adjust the AF output level to the samelevel as B.• Push [• LOCK] key.• Set an SSG’s level to 10 dB S/N sensitivity (A).• Measure the AF output level while the IC-R20outputs 1 kHz signal (B).• Measure the AF output level (C).• If AF output level C is lower than B, skip thisadjustment.• If AF output level C is higher than B, rotate[R-DIAL] to adjust the AF output level to the samelevel as B.• Push [• LOCK] key.ADJUSTMENT ADJUSTMENT CONDITION OPERATION*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.