Safety 1st TR233 Specifications download pdf (Page 66)

4.5.5 VHF Receiver Front End Alignment (Continued)

Step

Result

Measured by

Result

Measured at

Adjust Result Notes

RF sig. gen.

output.

0.31 uV pd

level.

SINAD

meter

Speaker

output at

SK202.

Greater

than 12dB

SINAD.

Verifies alignment

4.5.6 Mute Maximum Alignment

Step

Result

Measured by

Result

Measured at

Adjust

Result Notes

Switch on power

select channel 2.

Mid freq. channel.

Antenna

socket SK402

RF sig. gen.

output.

Freq. of ch. 2,

1 mV pd level

Modulate generator

with 1

kHz at 60% of

max dev.

AF level

meter.

Speaker

output SK202

Volume

control.

300mW in 4ohm.

4 Sinad meter

Speaker

output SK202

RF sig. gen.

output level

a) 23dB SINAD

b) 19 +/- 1dB

SINAD

a) for 20/25/30 kHz

channel spacing

b) for 12.5kHz

channel spacing

Record sig. gen. level.

Switch off RF

sig. gen. output.

Speaker

output SK202

Mute control

fully clock-wise.

AF should mute

If AF does not mute,

adjust R455

Switch on RF

sig. gen.

Same output

level as in step 4.

Ensure AF is

muted.

If AF does not mute,

adjust R455 slightly

clockwise to achieve

result.

AF level

meter.

Speaker

output SK202

R455 slowly

counter-clockwise.

AF output Adjust R455 carefully

appears.

AF level

meter.

Speaker

output SK202

RF sig. gen.

output off.

AF should mute

If AF does not mute

R455 has incorrect

adjustment.

Repeat steps 4 to 8.

AF level

meter.

Speaker

output SK202

RF sig. gen.

output on.

AF should If AF does not

unmute. carefully re-adjust

R455

Section 4 Page 8

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Safety 1st TR233 Specifications Page 66

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