Test Setup - Yaesu VR-120D Technical Supplement

Alignment

Test Setup

Set up the test equipment as shown below for
receiver alignment.
PLL Reference Frequency Adjustment
r Disable the Battery Save;
m Press the [ SCN ] key while press and holding
the [ FUNC ] key.
m Rotate the DIAL knob to select the display to
" ."
SAVE
m Rotate the DIAL knob while press and holding
the [ FUNC ] key to change the display to "
m Press the [ V/M ] key to disable the battery saver
and exit to normal operation.
r Connect the Frequency Counter to TP1, and set
the receiver to 100.050 MHz, NFM mode.
r Adjust C305, if necessary, so the counter
frequency is within ±200 Hz of 348.500 MHz.
RF Voltage
r Connect the DC voltmeter to TP2, and confirm
DC voltmeter reading 3.05~3.25V.
8
RF Sinal Generator
Frequency Counter
Regulated
6.0V PSU
SINAD Meter
AF Dummy Load
8-Ohms, 1W
."
OFF
VCO VCV
r Connect the DC voltmeter to TP3, and referring
to table below, tune the VR-120D to each
frequency listed.
Then confirm that the correct voltage is present.
Frequency
0.500 MHz
116.455 MHz
116.550 MHz
1299.950 MHz
FM Discriminator Adjustment
r Connect the AF Milivoltmeter and 8-ohm resistor
to the SP jack, and connect the RF Signal
generator (SSG) to ANT jack.
r Set the receiver to 100.020 MHz, NFM mode.
r Tune the SSG to 100.200 MHz with ±3.5 kHz
deviation ±1 kHz tone modulation, and set the
output level to 60 dBµ.
r Adjust L229 for maximum indication on the AF
Milivoltmeter.
SQL Level/S-Meter Adjustment
Preparation
r Set the receiver to 1250.375 MHz, NFM mode,
then disable the OFF-timer function and set the
ATT to OFF.
r Press and hold the [ SCAN ] key for 2 seconds,
the rotate the DIAL knob to select the display to
" ."
SL
r Press and hold the [ SCAN ] key for 2 second while
press and holding the [ FUNC ] key. "
will appears on the display. Sounds a beep.
r Tune the receiver to 123.125 MHz.
r Press and hold the [ SCAN ] key for 2 seconds,
the rotate the DIAL knob to select the display to
" ."
SS
r Press and hold the SCAN key for 2 second while
press and holding the [ FUNC ] key. "
appears on the display. Sounds a beep.
VCV Voltage
0.15V ~ 0.55V
6.30V ~ 8.60V
0.12V ~ 0.60V
5.40V ~ 6.60V
"
LOW W
" will
ST W