Icom IC-M604A Service Manual - Page 18

Receiver Adjustment

Get Icom IC-M604A PDF manuals and user guides View all Icom IC-M604A manuals
Add to My Manuals
Save this manual to your list of manuals

Page 18 highlights

5-3 RECEIVER ADJUSTMENTS ADJUSTMENT ADJUSTMENT CONDITION MEASUREMENT UNIT LOCATION VALUE ADJUSTMENT POINT UNIT ADJUST SENSITIVITY 1 • Operating channel : ch 16 MAIN Connect a tracking Set the flat wave form MAIN L11 (Except chan- • Connect a tracking generator's generator's input to as shown below. L12 nel 70) output to the antenna connector the MAIN unit; J3. L13 and set as: 3ETTOFLATWAVEFORM L14 Level : 7.1 mV* L15 (-30 dBm) -(Z -(Z (Channel 70) 2 • Operating channel : ch 70 MAIN Connect a DC volt- Maximum voltage MAIN L31 • Connect an SSG to the antenna meter to check point L32 connector and set as: CP3. L33 Frequency : 156.525 MHz L34 Level : 10 µV* (-97 dBm) Modulation : 1 kHz Deviation : ±3.5 kHz • Set the internal speaker OFF in the SET mode, and connect a distortion meter with a 4 Ω load to [EXT SP] receptacle. • Receiving *This output level of a standard signal generator (SSG) is indicated as SSG's open circuit. 5 - 3

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
*This output level of a standard signal generator (SSG) is indicated as SSG’s open circuit.
5-3 RECEIVER ADJUSTMENTS
SENSITIVITY
(Except chan-
nel 70)
(Channel 70)
ADJUSTMENT
ADJUSTMENT
ADJUSTMENT CONDITION
MEASUREMENT
VALUE
POINT
UNIT
LOCATION
UNIT
ADJUST
1
2
• Operating channel : ch 16
•
Connect a tracking generator’s
output to the antenna connector
and set as:
Level
:
7.1 mV*
(–30 dBm)
• Operating channel : ch 70
•
Connect an SSG to the antenna
connector and set as:
Frequency
: 156.525 MHz
Level
:
10 μV*
(–97 dBm)
Modulation
: 1 kHz
Deviation
: ±3.5 kHz
•
Set the internal speaker OFF in
the SET mode, and connect a
distortion meter with a 4
Ω
load
to [EXT SP] receptacle.
• Receiving
MAIN
MAIN
Connect a tracking
generator’s input to
the MAIN unit; J3.
Connect a DC volt-
meter to check point
CP3.
Set the flat wave form
as shown below.
Maximum voltage
MAIN
MAIN
L11
L12
L13
L14
L15
L31
L32
L33
L34
5 - 3