Reference And Receiver Adjustments - Icom DS-100 Service Manual

4-2 REFERENCE AND RECEIVER ADJUSTMENTS

ADJUSTMENT ADJUSTMENT CONDITION
LOCK 1 • Receiving
VOLTAGE
REFERENCE 1 • Receiving
FREQUENCY
1 • Connect an distortion meter with
SENSITIVITY
an 100 kΩ dummy load to the
extenal speaker jack J4 on MAIN
unit.
• Connect an SSG to the antenna
connector and set as:
Frequency
Level
Modulation
Deviation
• Receiving
SQUELCH 1 • Turn R29 counter clockwise on
the MAIN unit to 9 o'clock posi-
tion.
• Connect an SSG to the antenna
connector and set as:
Frequency
Level
Modulation
Deviation
• Receiving
*This output level of a standard signal generator (SSG) is indicated as SSG's open circuit.
MEASUREMENT
UNIT
MAIN
MAIN
MAIN
: 156.525 MHz
: 10 µV*
(–97 dBm)
: 1 kHz
: ±3.0 kHz
MAIN
: 156.525 MHz
: 0.25 µV*
(–119 dBm)
: 1 kHz
: ±3.0 kHz
4 - 2
LOCATION
Connect a digital
multi-meter or oscil-
loscope to check
point CP3.
Connect a frequen- 134.825000 MHz
cy counter to check
point CP4.
Connect a digital Maximum voltage
multi-meter or oscil-
loscope to check
point CP1.
DS1 At the point where the
check point DS1 just
turns OFF.
ADJUSTMENT
POINT
VALUE
UNIT ADJUST
2.1 V MAIN
MAIN
MAIN
MAIN Turn R29
to clock-
wise.
L9
C57
L1, L2,
L3, L4