K66VR- 5000̲Alignment.doc
2/3
Yaesu Musen Co．，Ltd.,
Alignment Preparation & Precautions
Correct alignment requires that the ambient temperature be the same as that of the
receiver and test equipment, and that this temperature be held constant between 20
and 30 C (68 86F). When the receiver is brought into the shop from hot or cold air it
should be allowed some time for thermal equalization with the environment before
alignment. If possible, alignments should be made with oscillator shields and circuit
boards firmly affixed in place. Also, the test equipment must be thoroughly warmed up
before beginning.
Note: Signal levels in dB referred to in this procedure are based on 0 dBu = 0.5
uV(closed circuit).
PLL
Set up the test equipment as shown for alignment.
Maintain the supply voltage at 13.8V DC for all steps.
PLL VCV (Main VCO)
1) Connect the positive lead of the DC voltmeter to the test point TP2011(VCV) on the
RF Unit, as indicated in the figure, and the negative lead to chassis ground.
2) Set the receiver to the 312.900 MHz, and adjust coil L2076 on the Unit for 7 V on
the voltmeter.
3) Next tune to 1.000 MHz and confirm about 1.0 V on the voltmeter.
4) Set the receiver to the 621.900 MHz, and adjust coil L2098 on the Unit for 7 V on
the voltmeter.
5) Next tune to 313.000 MHz and confirm about 1.0 V on the voltmeter.
PLL VCV (Sub VCO)
1) Connect the positive lead of the DC voltmeter to the test point TP2010(VCV) on the
RF Unit, as indicated in the figure, and the negative lead to chassis ground.
2) Set the receiver to the 2599.900 MHz, and adjust coil L2053 on the Unit for 6.5 V on
the voltmeter.
3) Next tune to 4.900 MHz and confirm about 2.0 V on the voltmeter.
PLL Reference Frequency
The frequency counter connected to J2010, and while tuned to 1.000 MHz, and
adjust TC2001 on the RF Unit, if necessary, so the counter frequency is within 100 Hz
of 568.245 MHz.
Receiver
Set up the test equipment as shown below for receiver alignment.
Interstage Transformers
1) While tuned to 101.000 MHz ,and the RF signal generator turned to the same
frequency, set the generator for
±
3.5 kHz deviation with 1kHz tone modulation,and
set the output level for 10 dBuV at the antenna jack.
2) Adjust CV3001 & CV3002 on the IF Unit for optimum SINAD,reducing the signal
