Yaesu VR-120D Technical Supplement

8
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 "OFF."
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.
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.
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. "LOW W "
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. "ST W " will
appears on the display. Sounds a beep.
Frequency VCV Voltage
0.500 MHz 0.15V ~ 0.55V
116.455 MHz 6.30V ~ 8.60V
116.550 MHz 0.12V ~ 0.60V
1299.950 MHz 5.40V ~ 6.60V
AF Dummy Load
8-Ohms, 1W
Frequency Counter
RF Sinal Generator
SINAD Meter
Regulated
6.0V PSU

Yaesu VR-120D Specifications

General

Brand	Yaesu
Model	VR-120D
Category	Receiver
Language	English