Uniden PRO520E (UT-317A)
Documentation Project

CBTricks.com

ALIGIMENT OF PLL PORTION

Test Equipment Required

a.

Oscilloscope (0-50MHz)

b.

DC Power Supply (13.8V)

c.

DC Voltmeter (by maximum, 100K ohm/V)

Adjustment Location Layout

Alignment Procedure

STEP

PRESET TO

ADJUSTMENT

REMARKS

1

TX Mode
Ch 40
No Modulation

L702

Connect DC Voltmeter to TP1 (Lead of R77).
Adjust for approx. 4.5V on DC Voltmeter

2

RX Mode
CH 40
No Modulation

L701

Sane as step 1.

* Note  MIC Signal Line of Dummy MIC requires electrolytic condenser due to MIC Jack J502's No. 1 pin added DC Voltage.


TEST EQUIPMENT CONNECTION

ALIGNMENT OF RECEIVER PORTION

Test Equipment Required

a.

RF Signal Generator (27 MHz Band, 1000 Hz,
30% Modulation & Output Impedance 50 ohm)

b.

AF VTVM

c.

Oscilloscope (0 50MHz)

d.

Dummy Load (8 ohm, 5 watts, resistive (General Output Power))

e.

DC Power Supply (13.8 V)

f.

DC Voltmeter

 

Alignment Procedure

STEP

PRESET TO

ADJUSIMENT

REMARKS

1

RX Mode 
CH19
VOL MAX
SQL MIN
ANL OFF
RF Gain MAX
CH9 OFF
PA OFF

L1, L2,
L3 L11

Connect RF SSG to ANT Connector (J501) and set it 27.185MHz. Connect AF VTVM to EXT. SPK. Jack (J3). Adjust coils for maximum reading on AF VTVM.

2

Same as above.

VR4

Set the SSG Attenuator to 0.25uV and adjust the output power to normal position. If the output power is less than normal, keep resistance value of VR4 at minimum (CW) and keep it at maximum (CCW) if over normal to the contrary.

3

Same as Step 1 except
SQL: MAX

VR1
(Squelch)

Set the RF Signal Generator to 1000uV output level. Adjust VR1 for 2V on AF VTVM.

4

Same as step 1
No Modulation

VR3

Set the RF Signal Generator to 1000uV output level. Adjust VR3 so that 4th digit of LED meter of the unit just illuminates.

 

TEST EQUIPMENT CONNECTION


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we cannot guarantee that the instructions will work on every radio presented.