Icom IC-821H Service Manual page 22

RECEIVER ADJUSTMENT (CONTINUED)
MEASUREMENT
ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONS VALUE
POINT
UNIT LOCATION UNIT ADJUST
UHF 1 • MAIN band Ireq. : 430.000 MHz MAIN Connect a DC Maximum level RF-B Adjust in
SENSITIVITY
• Mode
:FM voltmeter to C.P. (M-S).
repeatedly
(MAIN BAND)
• Connect an SSG to the [UHF ANT] C132,C120
connector and set as: C114,Cl08
Level : 3.2IlV* (-97 dBm)
L27,L23
Modulation
: 1 kHz L26, L21
Deviation : ±5 kHz L20, L22
• Receiving
UHF 1 • SUB band Ireq.
: 430.000 MHz
MAIN Connect a DC Maximum level RF-B Adjust in
SENSITIVITY
• Mode
:FM
voltmeter to C.P. (S-S).
sequence
(SUB BAND)
• Connect an SSG to the [UHF ANT] L25, L24
connector and set as:
Level
:3.2 IlV* (- 97 dBm)
Modulation : 1 kHz
Deviation : ±5 kHz
• Receiving
UHFRX
NOTE: Before adjusting UHF RX GAIN, 5-6 METER AND SQUELCH ADJUSTMENT must be adjusted.
GAIN
1
• MAIN band freq.
Front S-meter S9
RF-B
Rl04
[EUR] version 435.000 MHz
panel
[USA], [AUS] versions 440.000 MHz
• Mode
:FM
• Connect an SSG to the [UHF ANT]
connector and set as:
Level : 3.2 IlV* (- 97 dBm)
Modulation
: 1 kHz
Deviation : ±3.5 kHz
• Receiving
2
• SUB band freq.
Rear Adjust the connected 3.21lV (-97 dBm) Con- Verify
[EUR] version 435.000 MHz panel SSG output level until ±3dBm
nected
[USA]. [AUS] versions 440.000 MHz the S-meter shows S9
SSG
• Mode
:FM level.
• Receiving
NOISE 1 • MAIN band Ireq.
: 144.00000 MHz
Rear Connect an Minimum noise MAIN LS. L10
BLANKER
• Mode
:USB
panel oscilloscope to the level
• Connect an SSG to the [VHF ANT] [MAIN SP] jack with an
connector and set as: SQload.
Level : 10 IJ-V* (-87 dBm)
and apply following signal to the
antenna connector.
j'0om"l
l
1 msec.
• INB]
:ON
• Receiving
2
• SUB band freq.
: 144.00000 MHz
L 11S. L 110
• Mode
: USB
• Receiving
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
5-6