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2. UHF Unit
ITEM
ADJUSTMENT
POINT (S)
ADJUSTMENT METHOD
VCO VOLTAGE
© L4
(VCO BOX)
At 445.00MHz (T) or 435.00MHz (E), adjust L4 so that the voltage of
TP2 on E substrate is 4.0V (T) or 3.2V (E).
POWER
OUTPUT
© VR1 (HI)
© VR3 (MID)
© VR4 (LO)
On "HI" position, turn VR1 for 35W output at 444.95MHz (T) at
434.95MHz (E).
Verify the lighting of the entire RF meter.
On "MID" position, turn VR3 for 8W output at 444.95MHz (T) or
434.95MHz (E).
On "LO" position, turn VR4 for 4W output at 444.95MHz (T) or
434.95MHz (E).
DEVIATION
© VR2
Enter the AF level of OdBm, then pressing the PTT button, adjust VR2 so
that you obtain 4.8kHz/Dev at 444.95MHz (T) or 434.95MHz (E) and
AF 1kHz.
MIC GAIN
© VR1
Enter the AF level of -46dBm, then pressing the PTT button, adjust VR1
so that you obtain 4.0kHz/Dev at 444.95MHz (T) or 434.95MHz (E) and
AF 1kHz.
SUBAUDIBLE
TONE DEVIATION
(DR-590T)
© VR2
Pressing the tone button at 444.95MHz, verify 0.6-0.8kHz/ Dev at tone
frequency of 88.5Hz.
Adjust VR2.
1750Hz TONE
DEVIATION
(DR-590E)
© VR2
Pressing the tone button, verify that the tone frequency is 1750Hz and
the deviation is 3.5kHz ±0.2kHz.
Adjust VR2.
HELICAL FILTER
© TCI, TC2
LI, L2
Connect the output of a tracking generator to the antena and spectrum analyzer
to TP1 the adjust TCI, 2 and LI, 2 so that the sensitivity is at its peak between
440 and 450MHz at maximum gain. (570E: 430-440MFIz)
DESCRIMINATOR
© L3, L5
At 445.03MHz (T) or 435.03MHz (E) and 60
tiBju
input, adjust L3, L5 so
that the distortion is minimum at 50mW.
SQUELCH
© VR1
At 445.03MHz (T) or 435.03MHz (E) and cut the SG output power.
Adjust squelch knob point by VR1.
S-METER
© VR5
At 445.03MHz (T) or 435.03MHz (E) and 3-dB^ [EMF], adjust VR5 so
that 2 in the S-meter begins to light.
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