Icom IC-R75, Руководство по обслуживанию

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RECEIVER ADJUSTMENTS (continued)
1ST IF
FILTER
RECEIVER
TOTAL GAIN
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT LOCATION UNIT ADJUST
1
1
2
• Displayed frequency
: 14.10000 MHz
• Mode : FM
• PREAMP1 : ON
• IF FILTER1 : 15 kHz
• IF FILTER2 : 6 kHz
• set an SSG as
Frequency : 14.10000 MHz
Level : 0.32 µV*
(–10 dBµ)
Deviation : ±3.5 kHz
Modulation : 1 kHz
• Receiving
• Displayed frequency
: 14.10000 MHz
• Mode : USB
• PREAMP1 : OFF
• IF FILTER1 : 2.4 kHz
• IF FILTER2 : 2.4 kHz
• Set an SSG as
Frequency : 14.10150 MHz
Level : 500 µV*
(54 dBµ)
Modulation : OFF
• Set an SSG level as
: OFF
• Receiving
Rear
panel
Rear
panel
Connect the AC
milli-volt meter to
the [EXT SP] jack
with an 8
Ω
load.
Connect the AC
milli-volt meter to
the [EXT SP] jack
with an 8
Ω
load.
Maximum output level
0 dB
(1.0 V)
–30 dB
(10 mV)
MAIN
Front
panel
MAIN
L461,
L462
[AF GAIN]
control
R898
*This output level of the standard signal generator (SSG) is indicated as SSG’s open circuit.
4 - 5
EXT SP JACK
1st IF filter and receiver total gain check point
R898
Receiver total gain adjustment
1st IF filter adjustment
• MAIN UNIT
L462
L461