Safety 1st TR233 Especificações descarregar pdf (Página 64)

4.5.4 UHF Receiver Front End Alignment

Step

Result

Measured by

Result

Measured at

Adjust

Result Notes

Switch on power

and select channel

Lowest freq. channel.

Antenna

socket SK402

RF sig. gen.

output..

50uV pd level

and freq. for

channel 1.

Modulate generator

with 1 kHz at 60% of

max. dev.

CRO,

5mV ac per div.

10uSec per div.

10x probe.

PIN 2 of

U401

R554

Maximum level

on CRO.

Typ. 180mV p-p.

Sets tracking offset

adjustment.

4 Select ch. 3 Highest freq. channel.

5 RF sig. gen. output.

Freq. of channel

CRO

5mV ac per div

10uSec per div.

10x probe.

PIN 2 of

U401

R557

Maximum level

on CRC.

Typ. 200mV p-p.

Sets tracking gain

adjustment.

7 REPEAT STEPS 1 TO 6 TO ELIMINATE SLIGHT INTERACTION BETWEEN R554 AND R557.

8 Select ch. 3 Highest freq. channel

RF sig. gen.

output.

1 mV pd level,

and freq. of

channel 3.

AF level

meter.

Speaker

output at

S K202.

Volume

control.

300mW in

4ohm.

AF level

meter.

Speaker

output at

SK202.

L404

Max. AF

level.

Re-adjust volume

for 300mW output

when L404 is peaked

Distortion

meter.

Speaker

output at

SK202.

L404 Less than 3%

Slight re-adjustment

of L4'04 may be

necessary

RF sig. gen.

output.

0.31 uV pd

level.

14 SINAD meter

Speaker

output at

SK202.

Greater

than 12dB

SINAD.

Verifies alignment

Section 4 Page 6

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Safety 1st TR233 Especificações Página 64

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