Receiver Adjustments - Icom IC-R3 Service Manual

5-3 RECEIVER ADJUSTMENTS

The following adjustment must be peformed at the "ADJUSTMENT MODE".
The "S-METER" adjustment must be performed after "RECEIVER SENSITIVITY ADJUSTMENT".
ADJUSTMENT ADJUSTMENT CONDITION
RECEIVER
1 • Displayed frequency :
SENSITIVITY
• Connect an SSG to the antenna
connector and set as:
Level
Modulation : OFF
• Receiving
2 • Displayed frequency :
• Connect an SSG to the antenna
connector and set as:
Level
Modulation : OFF
• Receiving
• Same adjustments as step 1–2 for following frequencies :
3
65 MHz
108 MHz
174 MHz
330 MHz
470 MHz
600 MHz
NOTE: DO NOT change the SSG output level.
S-METER
1 • Displayed frequency :
• Mode
• Connect an SSG to the antenna
connector and set as :
Level
Modulation : OFF
• Receiving
2 • Same adjustments as step 1 for following frequencies and SSG'S output level :
S-Meter Adj. Freq.
6.500 MHz (SM ch)
15.020 MHz (SM ch)
51.100 MHz (SM ch)
107.980 MHz (SM ch)
159.980 MHz (SM ch)
174.020 MHz (SM ch)
279.960 MHz (SM ch)
330.020 MHz (SM ch)
500.020 MHz (SM ch)
670.020 MHz (SM ch)
*This output level of the standard signal generator (SSG) is indicated as SSG's open circuit.
(TL ch) 30.100 MHz
: 1 µV (–107 dBm)
*
(TL ch) 64.900 MHz
: 1 µV (–107 dBm)
*
(TL ch) 65.100 MHz
(TH ch) 107.900 MHz
(TL ch) 108.100 MHz
(TH ch) 173.900 MHz
(TL ch) 174.100 MHz
(TH ch) 224.900 MHz
(TL ch) 330.100 MHz
(TH ch) 469.900 MHz
(TL ch) 470.100 MHz
(TH ch) 599.900 MHz
(TL ch) 600.100 MHz
(TH ch) 799.900 MHz
(SM ch) 1.620 MHz
: FM
: 0.63 µV (–111 dBm)
*
SSG Level
0.50 µV
0.63 µV
0.50 µV
0.63 µV
0.63 µV
0.63 µV
0.63 µV
0.63 µV
0.63 µV
0.63 µV
MEASUREMENT
UNIT LOCATION
LOGIC Connect the digital
multi-meter to the
check point SD.
S-Meter Adj. Freq.
(–113 dBm)
* 800.020 MHz (SM ch)
(–111 dBm)
*
1230.050 MHz (SM ch)
(–113 dBm)
* 1427.980 MHz (SM ch)
(–111 dBm)
* 1450.980 MHz (SM ch)
(–111 dBm)
*
1501.020 MHz (SM ch)
(–111 dBm)
* 1600.020 MHz (SM ch)
(–111 dBm)
* 1666.100 MHz (SM ch)
(–111 dBm)
*
1850.200 MHz (SM ch)
(–111 dBm)
* 1961.020 MHz (SM ch)
(–111 dBm)
* 2110.020 MHz (SM ch)
5 - 5
ADJUSTMENT
VALUE
UNIT
Maximum voltage Top
panel
• Push the [MODE] key, and verify that
S-Meter shows S4 (3 dots).
SSG Level
1 µV (–107 dBm)
*
0.56 µV (–112 dBm)
*
0.79 µV (–109 dBm)
*
0.79 µV (–109 dBm)
*
0.50 µV (–113 dBm)
*
0.63 µV (–111 dBm)
*
0.79 µV (–109 dBm)
*
0.79 µV (–109 dBm)
*
1.4 µV (104 dBm)
*
0.79 µV (–109 dBm)
*
POINT
ADJUST
[DIAL]