2Nd Local Oscillator Adjustment; Pll Adjustment - Yaesu FT-950 Technical Supplement

2nd Local Oscillator Adjustment

Disconnect the coaxial cable from J4005 on the
LOCAL Unit, then connect the Frequency counter
to J4005.
Press and hold in the [1.8(1)], [3.5(2)], and [7(3)]
keys, while turning the radio on, to enter the
alignment mode.
Rotate the Main Tuning Dial knob to select the
alignment parameter "C-08 FrE".
Rotate the [CLAR(VFO-B)] knob so that the Fre-
quency counter reading is "69.000 MHz".
Press and hold in the [MENU] button for one sec-
ond to save the new setting and exit the align-
ment mode.
Disconnect the Frequency counter from J4005,
then connect the RF millivoltmeter to J4005.
Adjust T4003, T4004, and T4005 on the LOCAL
Unit for maximum deflection on the RF
millivoltmeter (more than 0 dBm).
Disconnect the RF millivoltmeter from J4005, then
re-connect the coaxial cable to J4005.
J4002
TC4001
TC4002
TC4003
TC4004
FT-950 Technical Supplement

PLL Adjustment

Connect the Digital DC voltmeter (high-Z) to
TP4005 on the LOCAL Unit.
Disconnect the coaxial cable from J4002 on the
LOCAL Unit, then connect the RF millivoltmeter
to J4002.
Press and hold in the [1.8(1)], [3.5(2)], and [7(3)]
keys, while turning the radio on, to enter the
alignment mode.
Referring to the table below, select the appropri-
ate "Alignment Parameter" using the Main Tun-
ing Dial knob per the chart below, and adjust the
listed components for the required voltage, or
confirm that the correct voltage is present on each
alignment parameter.
Disconnect the RF millivoltmeter from J4002, then
re-connect the coaxial cable to J4002.
Press and hold in the [MENU] button for one sec-
ond to save the new setting and exit the align-
ment mode.
TP4005
LOCAL U A
NIT LIGNMENT
A P A / C
LIGNMENT ARAMETER DJUST ONFIRM
A-01 V1H Adjust TC4004
A-02 V1L Confirm
A-03 V2H Adjust TC4003
A-04 V2L Confirm
A-05 V3H Adjust TC4002
A-06 V3L Confirm
A-07 V4H Adjust TC4001
A-08 V4L Confirm
P
OINTS
Alignment
DC RF
VOLTMETER MILLIVOLTMETER
5.0 V ±0.1 V At least –3 dBm
At least 0.7 V At least –3 dBm
5.0 V ±0.1 V At least –3 dBm
At least 0.7 V At least –3 dBm
5.0 V ±0.1 V At least –3 dBm
At least 0.7 V At least –3 dBm
5.0 V ±0.1 V At least –3 dBm
At least 0.7 V At least –3 dBm
T4003
T4004
J4005
T4005
ALIGNMENT-3