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Uniden PC787W TX ALIGNMENT PROCEDURE | Radioaficion Ham Radio

Uniden PC787W TX ALIGNMENT PROCEDURE

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Uniden PC787W ALIGNMENT PROCEDURE

ALIGNMENT OF TRANSMITTER

REQUIRED EQUIPMENT AND JIG

  • DC POWER SUPPLY 1 16V; >3A
  • DC CURRENT METER 1
  • RF COMMUNICATION TEST SET 1 8920B 60W
  • OSCILLOSCOPE 2 >50MHz
  • AF OSCILLATOR AF ATTENUATOR AC VOLTMETER MIC/PTT JIG SWR JIG
  • 10:1 RF Probe

EQUIPMENT / JIG CONNECTION DIAGRAM(ARIGN. PROCEDURE REF.DIAGRAM FORM4 CAN BE USED)

Uniden PC787W ALIGNMENT PROCEDURE

1. ALIGNMENT PROCEDURE

Connect PTT/MIC JIG PTT OFF/RX MODE to MIC JACK

FRONT PANEL setting

Uniden PC787W ALIGNMENT PROCEDURE

STEP CH

TEST CONDITION

ADJ.

PROCEDURE

1

19

POWER ON, CH set to CB/19



2

19

PTT SW ON (MIC NO INPUT)

L211

L210

Connect RF probe to TP203

Adjust L211and L210 to maximum on oscilloscope reading. Repeat two times of above.

3

19

PTT SW ON (MIC NO INPUT)

L209

Connect RF probe to TP201

Adjust L209 to maximum on oscilloscope reading.

4

19

PTT SW ON (MIC NO INPUT)

L204 L204

ADJUST RF TX POWER to MAXIMUM

ADJUST RF TX POWER to 3.65W ±0.05*1 CHECK DC current; less than 1.5 A CHECK TX FREQ.;27.185MHz +/- 300Hz

5

19

METER_SW set to S/RF

PTT SW ON

MIC INPUT : NO SIGNAL

RT201

ADJUST METER TO "4" position

6

19

PTT SW ON

MIC GAIN : set to MAX MIC INPUT : 1kHz / 1mV


CHECK AM MODULATION : 50% or more

*1 Adjust L204 to the CW direction from the maximum power position

Uniden PC787W ALIGNMENT PROCEDURE

ADJUSTMENT POINTS

Uniden PC787W ALIGNMENT PROCEDURE

Related Pages:

PC787W ALIGNMENT OF RECEIVER

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