Icom IC-M400BB Service Manual page 4

July 2013
2 FREQUENCY ADJUSTMENTS
Select an adjustment item using [↑] / [↓], and then set to the specifi ed value using [←] / [→] on the connected PC's keyboard.
TRANSCEIVER'S
ADJUSTMENT
PLL LOCK 1 • Channel
• Receiving
VOLTAGE
(VERIFICATION)
2 • Channel
• TX power
• Transmitting
REFERENCE 1 • Channel
FREQUENCY • TX power
• Transmitting
• I/O Check window
(Additional page)
CONDITION
: 16 1) Connect an RF power meter (or a
dummy load) to the antenna connector.
2) Verify that the lock voltage is in the
: 16
specified range on the "I/O check
: Low
window" (see the illust below).
: 16 1) Connect an RF power meter (or a
: Low
dummy load) to the antenna connector.
2) Loose couple a frequency counter to
the antenna connector.
3) Adjust the TX frequency.
(The values shown above are exsample only.
Each transceiver has own values.)
OPERATION
Lock voltage is displayed here.
3
ADJUSTMENT
VALUE
ITEM
2.0 V ±0.5 V
(Verify)
[LVIN]
(I/O check
1.9 V ±0.5 V
window)
(Verify)
156.8000 MHz
[Ref. Freq.]
(±100 Hz)