MLS MLSH041 Manual de instalación descargar pdf (Pagina 24)

LBI-38425A ALIGNMENT AND TROUBLESHOOTING PROCEDURES

5.3.2 Alignment Procedure

STEP

TEST

POINT

TUNING

CONTROL

METER

READING PROCEDURE

1 TP501 9.0 ± 0.2 VDC Connect the DC Voltmeter to TP501.

2 TP504 L511 See Procedure Connect RF signal probe from the

frequency counter to TP504. Check

for a reading of 81.745 MHz ±200

Hz.

3 TP503 L513 See Procedure Set the signal generator on the receive

frequency with ±3 kHz deviation and

1 kHz modulation.

Set the RF signal level to 1000

microvolts.

Connect the audio level meter (use a

high impedance meter) to TP503.

Adjust the L513 until audio output

level becomes maximum.

4 J701-1

-6

See Procedure Move P551 from J551-1 & 2 to J551-

2 & 3 in receiver unit.

Terminate J701-1 & -6 with a 4 ohm,

6 watt resistor.

Connect the Audio Level Meter and

Distortion Analyzer input across the

resistor.

Adjust the volume control for 4 W

output (4.0 Vrms) using Audio Level

Meter.

5 J701-1 L501

L503

See Procedure Set the output signal level of RF

signal generator so as to obtain 12 dB

SINAD at audio output.

Adjust coils L501 and L503 to obtain

maximum 12 dB SINAD sensitivity.

Return P551 to J551-1, 2.

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MLS MLSH041 Manual de instalación Pagina 24

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