Receiver Adjustment - Icom IC-821H Service Manual

5-4 RECEIVER ADJUSTMENT
MEASUREMENT
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONS VALUE
POINT
UNIT LOCATION UNIT
ADJUST
VHF 1
• MAIN band Ireq.
: 144.000 MHz
MAIN Connect a DC Maximum level RF-A Adjust in
SENSITIVITY • Mode
:FM voltmeter to C.P. (M-S). sequence
(MAIN BAND)
• Connect an SSG to the [VHF ANT] L16, L15,
connector and set as: L14, L13,
Level
: 3.2IlV* (- 97 dBm) L21
Modulation : 1 kHz
Deviation : ±5 kHz
MAIN L 11, L12,
• Receiving L13
2
• Mode
:USB Rear Connect an AC Maximum audio MAIN Adjust in
• Set an SSG as:
panel millivoltmeter to the output sequence
Level :O.lIlV*( 127 dBm) [MAIN SP) jack with an L25, L27,
Modulation : OFF 8Qload.
L28
VHF 1
• SUB band Ireq.
: 144.000 MHz MAIN Connect a DC Maximum level MAIN Adjust in
SENSITIVITY
• Mode
:FM voltmeterto C.P. (S-S). sequence
(SUB BAND)
• Connect an SSG to the [VHF ANT]
L46. L47,
connector and set as: L48
Level : 3.2IlV· (-97 dBm)
Modulation : 1 kHz
Deviation : ±5 kHz
2
• Mode
: USB
Rear Connect an AC Maximum audio Adjustm in
• Set an SSG as:
panel millivoltmeter to the output sequence
Level :0.1IlV*(-127dBm} [SUB SP) jack with an L38. L40,
Modulation : OFF 8Qload. L41
VHF
1
• MAIN band Ireq.
: 144.00000 MHz Rear Connect an AC 1.5 kHz audio SSG Output
TOTAL GAIN
• Mode
:USB panel millivoltmeter to the frequency
(MAIN BAND)
• Connect an SSG to the [VHF ANT]
[MAIN SP) jack with an
connector and set as: 8 Qload.
Level
: 1 mV' (-47 dBm)
Modulation
: OFF 1.0 V (0 dB) Front [MAINAF)
• Receiving panel
control
2 • Set an SSG level as: OFF 100 mV(-20 dB) MAIN R239
VHF 1 • SUB band Ireq.
: 144.00000 MHz Rear Connect an AC 1.5 kHz audio
SSG
Output
TOTAL GAIN
• Mode
:USB panel millivoltmeter to the frequency
(SUB BAND)
• Connect an SSG to the [VHF ANT]
[SUB SP) jack with an
connector and set as: 8 Qload.
Level : 1 mV* (-47 dBm)
Modulation : OFF
1.0 V (0 dB) Front [SUBAF]
• Receiving
panel
control
2
• Set an SSG level as: OFF
100 mV (-20 dB) MAIN R378
'This output level 01 the standard signal generator (SSG) is indicated as SSG's open circuit.
5-4