Midland 4001 Manuale utente

Warning : Any repairs or adjustment should be made under the supervision of a

qualified radio-telephone technician.

8.1.VCO locking voltage

-Set unit chanel 40

-TX no mod

-Check voltage at TP1

-Adjust L501 until voltage at TP1 to be equal to 4 volt

8.2.TX frequency

-Set unit chanel 20

-TX no mod

-Measure frequency

-Adjust CT201 until frequency to be equal to 27.205MHz

-If can not measure frequency skip to adjust TX power and return to this

methode next time

8.3.TX power

-Set unit chanel 20 mic gain maximum

-Adjust L502,L10,L11 and L6 downward for minimum

-Adjust L11 upward 1 round ( 360°)

-TX with mod 1.25KHz up 20 dB

-See signal at oscilloscope

-Adjust L10 upward for maximum

-Adjust L11 again for maximum

-TX no mod

-Adjust C607 for maximum power

-Adjust RV102 until TX power to be equal to 3.8 volt

8.4.TX AM modulation

-Set unit chanel 20 mic gain maximum

-TX with mod 1KHz up 20 dB

-Measure % modulation

-Adjust RV 201 for modulation 90%

-TX with mod 1KHz down20 dB

-Measure % modulation

-Adjust level at CR oscilator until % modulation to be equal to 30%

-TX with mod 1KHz up 20 dB

-If % modulation not equal with 90% back to adjust RV 201 again

8. ALIGNMENT INSTRUCTIONS MIDLAND 4001

8.5.TX s-meter

-Set unit chanel 20

-TX no mod

-See s-meter

-Adjust RV 202 until s-meter to be equal to 4 watt

8.6.AWI

-Set unit chanel 20 mic gain maximum

-TX with mod up 20 dB

-See D306 ( LED AWI )

-Adjust RV 301 until D306 off

-Check AWI

-If AWI not operate back to adjust RV 301 again

8.7.RX sentivity

-Set SSG frequency 27.185 MHz AM 60% mod

-Set unit chanel 19 RF gain maximum,squelch minimum,control volume 2 volt

-Measure sentivity

-Adjust L4 downward for minimum

-Adjust L1,L2,L3 for maximum sentivity

8.8.Squelch

-Set SSG frequency 27.185 MHz AM 60% mod level –57 dBm

-Set unit chanel 19 RF gain maximum,squelch maximum,control volume 2 volt

-See signal at oscilloscope

-Adjust RV 101 until appear signal at oscilloscope

8.9.RX s-meter

-Set SSG frequency 27.185 MHz AM 60% mod level –67 dBm

-Set unit chanel 19 RF gain maximum,squelch minimum

-See s-meter

-Adjust RV 103 until s-meter to be equal to s-9

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