Alinco DJ-175 Service Manual page 23

5. Microphone deviation
Select memory ch.5.
Input the signal as specified below from an Audio generator and transmit. Measure the
deviation value using a Liner-detector. Press PTT on the unit to transmit. One of digits
00-FF should appear on the display where memory channel number was shown. Rotate
the dial on the unit to adjust the deviation to meet the specification. Release the PTT to
finish the adjustment.
Specification : 4.3±0.1kHz (T, E, TFH)
Measuring condition:(1). Audio generator setting
Necessary instrument:(1). Audio generator
6. CTCSS tone 88.5Hz deviation and adjustment of the sign-wave
Select memory ch.6.
Press PTT to automatically transmit 88.5Hz tone. Measure the deviation value using a
Liner-detector. Press PTT on the unit to transmit. One of digits 00-FF should appear on
the display where memory channel number was shown. Rotate the dial on the unit to
adjust the tone deviation to meet the specification below. Use an oscilloscope to monitor
the sign-wave then correct the wave shape (see the chart 1 below).
Specification: 0.80±0.05KHz (T, E)
Necessary instrument:(1). Linear detector
7. DCS 255 deviation
Select memory ch.7.
Press PTT to automatically transmit DCS code of 255. Measure the deviation value using
a Liner-detector. Press PTT on the unit to transmit. One of digits 00-FF should appear on
the display where memory channel number was shown. Rotate the dial on the unit to
adjust the tone deviation to meet the specification below.
Specification: 0.80±0.05KHz (T, E, TFH)
Necessary instrument:(1). Linear detector
2.2±0.1kHz (EUK)
Frequency: 1kHz
Output Level:50mV
(2). Linear detector
0.90±0.05KHz (TFH)
0.50±0.05KHz (EUK)
(2). Oscilloscope
0.50±0.05KHz (EUK)
OK
NG
NG
Chart 1: sign-wave correction