Pll Adjustmenst - Icom IC-FR3000 Service Manual

4-2 PLL ADJUSTMENT
ADJUSTMENT ADJUSTMENT CONDITIONS
TX VCO LOCK • LCD display
VOLTAGE 1 • Transmitting
RX VCO LOCK • LCD display
VOLTAGE 1 • Receiving
REFERENCE 1 • Wait for 5 minutes after power ON.
FREQUENCY • LCD display
Connect an RF power meter or 50 Ω
dummy load to the [TX] antenna con-
nector.
• Transmitting
2 • LCD display
• Receiving
UNIT
: A01 LW TXREF 127
: A01 LW TXREF 127
REAR
: A01 LW TXREF panel
: A01 LW RXREF
MEASUREMENT
LOCATION
Connect a digital multi
TX meter or oscilloscope
to check point CP4.
Connect a digital multi
RX meter or oscilloscope
to check point CP3.
Loosely couple a fre-
quency counter to the
[TX] antenna connec-
tor.
RX Connect a frequency
counter to check point
CP2.
4 - 4
ADJUSTMENT
VALUE
UNIT ADJUST
4.0 V TVCO
4.0 V RVCO
173.7250 MHz FRONT [PRT/BASE]
142.2750 MHz FRONT [PRT/BASE]
C17
C17
/[MONI]
/[MONI]