Yaesu FT-950, Technical Supplement

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ALIGNMENT-6
Alignment
FT-950 Technical Supplement
MCF Adjustment (2)
ˆ
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.
ˆ
Rotate the Main Tuning Dial knob to select the
alignment parameter “G-03 FnG”.
ˆ
Rotate the [CLAR(VFO-B)] knob so that the Mult-
Display Window shows “80”.
ˆ
Press and hold in the [MENU] button for one sec-
ond to save the new setting and exit the align-
ment mode.
ˆ
Set the VFO-A frequency to 50.000 MHz in the
FM mode.
ˆ
Set the following controls as indicated:
[ANT 1-2] button: ANT 1
[IPO] button: AMP2
[ATT] button: OFF
[µ-TUNE] button: THRU
[R.FLT] button: 15 kHz
[AGC] button: AUTO
[RF GAIN] knob: Fully clockwise
ˆ
Connect the SINAD meter and 4 Ohm dummy
load to the EXT SP jack.
ˆ
Connect the RF Signal Generator to the “ANT 1”
jack, then set the output level to –10 ~ 0 dBµ at
the 50.000 MHz with ±3.5 kHz deviation FM
modulation of a 1 kHz audio signal.
ˆ
Adjust T1024 and T1031 on the MAIN Unit in
succession several times for maximum deflection
on the SINAD meter.
ˆ
Adjust T1022 on the MAIN Unit in succession
several times for maximum deflection on the
SINAD meter.
Note : Do not adjust T1022 more than 45 degrees
rotation.
Noise Blanker Circuit Adjustment
ˆ
Set the VFO-A frequency to 14.200 MHz in the
CW mode.
ˆ
Set the following controls as indicated:
[ANT 1-2] button: ANT 1
[IPO] button: AMP1
[ATT] button: OFF
[µ-TUNE] button: THRU
[R.FLT] button: AUTO
[AGC] button: AUTO
[NB] button: ON (for short-duration pulse noise)
[RF GAIN] knob: Fully clockwise
ˆ
Connect the Digital DC voltmeter (high-Z) to
TP1059 on the MAIN Unit.
ˆ
Connect the RF Signal Generator to the “ANT 1”
jack, then set the output level to 30 dBµ at 14.200
MHz.
ˆ
Adjust T1029 and T1023 on the MAIN Unit for
minimum deflection on the DC voltmeter.
ˆ
Turn the NB to “OFF” by pressing the [NB] but-
ton.
Scope Circuit Adjustment
ˆ
Set the VFO-A frequency to 14.200 MHz in the
CW mode.
ˆ
Set the following controls as indicated:
[ANT 1-2] button: ANT 1
[IPO] button: AMP1
[ATT] button: OFF
[µ-TUNE] button: THRU
[R.FLT] button: AUTO
[AGC] button: AUTO
[RF GAIN] knob: Fully clockwise
ˆ
Disconnect the coaxial cable from J1028 on the
MAIN Unit, then connect the RF millivoltmeter
to J1028.
ˆ
Connect the RF Signal Generator to the “ANT 1”
jack, then set the output level to 80 dBµ at 14.200
MHz.
ˆ
Adjust T1019 on the MAIN Unit for maximum
deflection on the RF millivoltmeter.
ˆ
Disconnect the RF millivoltmeter from J1028, then
re-connect the coaxial cable to J1028.