Pll Vcv Reference Oscillator; Transmitter Deviation - Yaesu FT-2200 Technical Supplement

- - PLL VCV, Reference Oscilletor
&
Transmitter Deviation
-
PLL & Trans1nitter
Set up the test equipment as shown fortran-
smitter alignment. Maintain the supply vol-
tage at 13.8V DC for all steps.
PLL
&
Transmitter Alignment Setup
13.8V DC
Power Supply
AF Generator
AF Millivoltmeter
F req. Counter
Oscilloscope
PLL VCV (Varactor Control Voltage)
0 Connect the positive lead of the DC voltme-
ter to the test point TP1001 on the Main Unit,
as indicated in the figure, and the negative
lead to chassis ground.
0 Set the transceiver to the top edge of the
band for the version type being aligned, and
adjust coil L303 on the VCO Unit for the
-\ voltage indicated below while receiving at
that frequency.
RX & TX VCV ALIGNMENT DATA
Version
Low Band-Edge
High Band-Edge
Frequency Voltage Frequency Voltage
81
144 MHz < 2.0 146 > 2.7
A2
140 MHz < 1.3 150 > 3.2
A3
140 MHz < 1.3 174 6.3
±
0.2
83 140 MHz
< 1.3
174
6.3
±
0.2
-
0 Retune to the low band-edge frequency, and
confirm the VCV voltage as indicated in the
table.
0 Tune to the high band-edge channel, and
this time key the transmitter while adjusting
coil L304 on the VCO Unit for the voltage
indicated in the table for transmit.
0 Again retune to the low-edge channel, key
the transmitter, and confirm the VCV volt-
age.
PLL Reference Frequency
0 With the wattmeter, dummy load and fre-
quency counter connected to the antenna
jack, and while tuned to 146.000 MHz, key
the transmitter and adjust TC1001 on the
Main Unit, if necessary, so the counter fre-
quency is within 100Hz of 146.000 MHz.
Transmitter Deviation
0 While tuned to 146.000 MHz, adjust the AF
generator attenuator for 50 m V output at 1
kHz to the
MIC
jack.
0 Key the transmitter and adjust VR1001 on
the Main Unit for± 4.5 kHz deviation on the
deviation meter (within 100Hz).
Automatic Final Protection
0 Disconnect the dummy load from the an-
tenna connector. Connect a DC Ammeter in
series with the power cable.
0 Connect the DC voltmeter to test point
TP1002located near VR1002.
0 Key the transmitter and adjust VR701 on the
PA Unit for minimum voltage indicated on
the voltmeter.
0 Key the transmitter and adjust VR1002 on
the Main Unit for maximum current indi-
cated on the ammeter.
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FT-2200 Technical Supplement