Alinco DJ-560T Service Manual page 11

■ UHF
Adjustment
Item
point(s)
VCO Voltage L5
(U-VCO Board)
L2
(U-VCO Board)
Basic TC4
(RF Board)
Frequency
*Hi Power
Output Power
VR1
(RF Board)
*Low Power
Verification only
Deviation VR3
(RF Board)
Verification only
Signal to Verification only
Noise Ratio
VR8
DTMF
Deviation (IF Board)
VR7
Subaudible
Tone Deviation (IF Board)
(T , TW)
1,750Hz VR7
Tone Deviation (IF Board)
(E)
Transmitting Verification only
Range
Detection Coil L2
(IF Board)
Front End TC5, TC6, TC7,
L3, L4, L5
(RF Board)
S meter VR2
(IF Board)
Total Distortion Verification only
Total Signal to Verification only
Noise Ratio
Maximum Verification only
Output Power
Squelch Verification only
Receiving
Verification only
Range
Transmitting
Spurious
. . . .
1. Transmit at 430.00MHz(E) or 440.00MHz(T, TW) on Low power, then adjust L5 on U-VCO board
so that the voltage of TP1 on U-VCO board is 0.6 — 1.0V(E) or 0.9 — 1.1 V(T TW).
2. Receive at 430.00MHz(E) or 440.00MHz(T, TW), then adjust L2 on U-VCO board so that the
voltage of TP1 is 0.2 - 0.3V(E) or 1.0V(T, TW).
Select UHF as the main band and transmit at 434.95MHz(E) or 444.95MHz(T, TW), then adjust
TC4 on RF board so that the frequency is 434.95MHz + 50Hz(E) or 444.95MHz + 50Hz(T, TW).
Transmit at 434.95MHz(E) or 444.95MHz(T, TW), then adjust VR1 on RF board so that the output
power is 3.2W.
Verify that RF meter is full.
Transmit at 434.95MHz(E) or 444.95MHz(T TW) on Low Power, then verify the output power is
0.1 - 1W .
Verify that 5 in the RF meter lights up.
Transmit at 434.95MHz(E) or 444.95MHz(T, TW) and enter the microphone input of -26dBm/1kHz,
then adjust VR3 on RF board so that the deviation is 4.2kHz.
Enter the microphone input of -45dBm/1kHz, then verify the deviation is 3.5kHz± 0.5kHz.
Enter the microphone input of 3.5kHz/dev/1kHz, then verify that transmit signal noise is 35dB or
over.
Turn off the modulation output of the signal generator and transmitting at 434.95MHz(E) or
444.95MHz(T, TW) and press the key pad 1, then adjust VR8 on IF board so that the deviation
3.1kHz.
Turn off the modulation output of the signal generator and transmit a tone of 88.5Hz, then adjust
VR7 on IF board so that the deviation is 800Hz.
Turn off the modulation output of the signal generator and at 434.95MHz, press the tone burst
switch on Switch board to transmit, then adjust VR7 on IF board so that the deviation is 3.5kHz.
On Hi power, transmit at the following frequencies and verify the output power as follows;
2.3W or over at 428.00MHz
2.3W or over at 440.00MHz
0.1W or over at: 465.00MHz
At 435.03MHz(E) or 445.03MHz(T, TW), enter +66dB^/1kHz/3.5kHzDev of signal generator, then
adjust L2 on IF board so that the detection output power is at its maximum.
At 435.03MHz(E) or 445.03MHz(T, TW), adjust TC5, TC6, TC7, L3, L4, and L5 on RF board so that
12dB SINAD sensitivity is at its maximum.
At 435.03MHz(E) or 445.03MHz(T, TW), enter a signal of + 13dB of signal generator, then adjust
VR2 on IF board so that FULL in the S meter starts lighting.
At 435.03MHz(E) or 445.03MHz(T, TW), enter a signal of +66dB^/1kHz/3.5kHzDev of signal
generator, then verify that the distortion ratio is 5% or less at OdBm.
At 435.03MHz(E) or 445.03MHz(T, TW), enter a signal of + 66dB^1kHz/3.5kHzDev of signal
generator, then verify that the S/N is 35dB or over.
At 435.03MHz(E) or 445.03MHz(T, TW), enter a signal of +.66dB^1kHz/3.5kHzDev of signal
generator, then verify that the output power is 4dBm(190mW) or over.
1. Turn off the output power of signal generator and rotating squelch knob of UHF, verify that the
noise disappears at the position between 8:30 and 12 o'clock of the knob.
2. Turn the squelch knob until the noise just disappears, then verify that squelch will open at
435.03MHz(E) or 445.03MHz(T, TW) and -10dB of signal generator.
3. Rotate squelch knob fully clockwise, then changing the output power of signal generator, verify
that the squelch will open at -6dB ±4dB .
Enter a signal of + 66dB/i/1kHz/3.5kHzDev of signal generator, then verify that the unit can receive
at 428.00MHz and 469.99MHz.
At 434.95MHz, 429.95MHz, and 439.95MHz(E) or 444.95MHz, 439.95MHz, and
449.95MHz(T, TW), verify that the transmitting spurious is -60dB c or under on Hi power and
- 50dBc or under on Low power.
Adjustment method
10
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