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4.1.3 RECEIVER ALIGNMENT
ITEM U.U.T.
SETTING
ADJUST
POINT
MEASUREMENT
AM Sensitivity Set radio to CH 19 AM RX mode.
Set RF GAIN Fully Clockwise.
Set SQ Fully Counter Clockwise.
Set VOL Control at 2 o’clock.
Set NB/ANL switch to OFF position.
Set CLARIFIER Control to 12 o’clock.
Connect RF SG to antenna jack
Frequency 27.185 MHz, 1uV. Mod 30%.
L2,L3,L5,L6,
L7,L8,L9,L10
Audio Output > 2V
S/N > 10 dB.
Set radio to CH 40 AM RX mode.
RF SG setting 27.405 MHz.
Set radio to CH 1 AM RX mode.
RF SG setting 26.965 MHz.
L5,L6
For Balance Between
CH 1 and CH 40.
USB Sensitivity Set radio to CH19 USB RX mode.
Set VOL Control Fully Clockwise.
RF SG setting 27.186 MHz, 0.5uV. Mod off.
L11,L12
Audio Output
>
2V
S/N > 10dB.
LSB Sensitivity Set radio to CH19 LSB RX mode.
Set VOL Control Fully Clockwise.
RF SG setting 27.184 MHz, 0.5uV. Mod off.
L11,L12
Audio Output
>
2V
S/N >10dB.
NB Adjust
Set radio to CH 18 AM RX mode
RF SG setting 27.185 MHz, 1000uV. Mod off.
Set NB/OFF switch to ON position.
Connect Multi-meter to TP1 (D2 cathode).
L1
DC Voltage to max.
( > 2.0V )
AM Squelch
Set radio to CH 19 AM RX mode.
Set SQ Control Fully Clockwise.
RF SG setting 27.185 MHz, 20mV. Mod 30%.
VR4
Adjust very slowly
until squelch just
closes.
SSB Squelch
Set radio to CH 19 USB RX mode.
Set SQ Control Fully Clockwise.
RF SG setting 27.186 MHz, 20 mV. Mod off.
VR3
Adjust very slowly
until squelch just
closes
AM S-Meter
Set radio to CH 19 AM RX mode.
RF SG setting 27.185 MHz, 100uV. Mod 30%.
VR1
For a reading of “9”
on the “S” scale.
SSB S-Meter
Set radio to CH 19 USB RX mode.
RF SG setting 27.186 MHz, 100uV. Mod off.
VR2
For a reading of “9”
on the “S” scale
Содержание DX 979
Страница 1: ...CB Radio Model DX 979 Service Manual Copyright Reserved...
Страница 11: ...10...
Страница 15: ...14 Figure 4 1 Transmitter test setup Figure 4 2 Receiver test setup...
Страница 19: ...18 DX 979 ROTARY SWITCH PCB EPT092920Z SMD COPPER SIDE COMPONENT SIDE...
Страница 21: ...20 DX 979 DISPLAY PCB EPT092930Z COMPONENT SIDE COMPONENT SIDE COPPER SIDE...
Страница 23: ...22 DX 979 DIM PWR MIC RF VOL SQ CONTROL VR PCB EPT092940Z COMPONENT SIDE COPPER SIDE...
Страница 26: ...25 DX 979 METER PCB EPT092961Z COMPONENT SIDE COPPER SIDE COPPER SIDE SMD...
Страница 29: ...28 DX 979 MAIN PCB EPT092913Z COMPONENTS SIDE...
Страница 30: ...29 DX 979 MAIN PCB EPT092913Z COPPER SIDE...
Страница 33: ...DX 979 SCHEMATIC DIAGRAM CONTROL PCB...
Страница 34: ...DX 979 SCHEMATIC DIAGRAM MAIN PCB...
Страница 35: ...DX 979 MECHANICAL PART DX 979 EXPLODE DRAWING...
Страница 38: ...ATS979010A July 2003...