Icom IC-M400BB Service Manual page 5

July 2013
3 RECEIVE ADJUSTMENTS
Select an adjustment item using [↑] / [↓], and then set to the specifi ed value using [←] / [→] on the connected PC's keyboard.
TRANSCEIVER'S
ADJUSTMENT
SQUELCH 1 • Channel
-Threshold-
• Receiving
-Tight- 2
†
; For all models except [USA]
4 TRANSMIT ADJUSTMENTS
Select an adjustment item using [↑] / [↓], and then set to the specifi ed value using [←] / [→] on the connected PC's keyboard.
TRANSCEIVER'S
ADJUSTMENT
TX POWER 1 • Channel
• TX power
-High power-
• Transmitting
-Low power- 2 • Channel
• TX power
• Transmitting
DEVIATION 1 • Channel
• TX power
• Transmitting
MODULATION 1 • Channel
• TX power
SENSITIVITY
• Transmitting
(Additional page)
CONDITION
: CH116* • Connect a signal genelator to the
WX10**
antenna connector, and then set it as
shown below.
Frequency : 163.425 MHz
Modulation : 1 kHz
Deviation
Level
• Set the SSG as shown below.
Level
*; For only [USA] versions.
CONDITION
: 16 1) Set the power supply voltage to 13.8 V.
: High
2) Connect an RF power meter to the
antenna connector.
3) Adjust the TX power.
: 16
: Low
: 16 1) Connect a modulation analyzer to
: Low
the antenna connector, through an
attenuator, and then set it as show
below.
HPF
LPF
De-emphasis : OFF
Detector
2) Connect an audio generator (output
impedance=600 Ω) to the "AF/MIC" line
of [CMD-MIC], and then set it as shown
below.
Frequency : 1 kHz
Waveform
Level
: 16 • Set the audio generator as below.
: Low
Level
OPERATION
†
163.275 MHz*
: ±3.0 kHz
: The RF level where the
†
SINAD is 25 dB
–12.0 dBµ (–119 dBm)*
†
: 3.5 dBµ (–103.5 dBm)
–2.5 dBµ (–109.5 dBm)*
OPERATION
: OFF
: 20 kHz
: (P±P)/2
: Sine wave
: 280 mVrms
: 28 mVrms
4
ADJUSTMENT
VALUE
ITEM
[SQL
(threshold)]
Push [Enter].
(Automatic
adjustment)
[SQL (tight)]
ADJUSTMENT
VALUE
ITEM
[Power (High)] 22.5 W
[Power (Low)] 0.75 W
±4.35 ±0.05
[MOD]
kHz
[MSENS (EXT)] ±3.0 ±0.2 kHz