RECEIVER ADJUSTMENT (Continued)

The following adjustment must be performed on the normal mode after “SENSITIVITY ADJUSTMENT” in SECTION 5-3.

ADJUSTMENT

ADJUSTMENT CONDITION

MEASUREMENT

VALUE

ADJUSTMENT

 

 

 

 

 

 

UNIT

LOCATION

 

 

 

 

 

 

 

 

 

S-METER

1

• Displayed frequency :

Top

 

 

Push and hold

(50 MHz band)

 

51.000 MHz

[EUR], [UK], [ITA]

panel

 

 

the [SQL] key

 

 

52.000 MHz

 

 

 

 

 

 

 

[AUS], [SEA], [USA-1]

 

 

 

 

 

 

• Connect the SSG to the antenna

 

 

 

 

 

 

connector and set as:

 

 

 

 

 

 

Level

: 1 µV*

 

 

 

 

 

 

 

(– 107 dBm)

 

 

 

 

 

 

Modulation

: 1 kHz

 

 

 

 

 

 

Deviation

: ± 3.5 kHz

 

 

 

 

Connect a terminator to the [SP] jack.

Receiving

2

• Set an SSG output level for the

 

0.56 µV – 1.8 µV

Verify

 

 

S-meter to S3.

 

(-112dBm-102 dBm)

 

 

 

• Receiving

 

 

 

 

 

 

 

 

 

3

• Increase an SSG output level.

Front S-meter

Full scale

Verify

 

 

• Receiving

panel

 

 

 

 

 

 

 

 

(WFM band) 4

• Displayed frequency :

Top

 

Push and hold

 

 

92.000

MHz [SEA], [USA-1]

panel

 

the [SQL] key

 

 

98.000

MHz

 

 

 

 

 

[EUR], [UK],[ITA], [AUS]

 

 

 

Connect the SSG to the antenna connector and set as:

Level

: 2 µV*

 

(– 101 dBm)

Modulation

: 1 kHz

Deviation

: ± 52.5 kHz

Connect a terminator to the [SP] jack.

Receiving

5

• Increase an SSG output level.

Front S-meter

Full scale

Verify

 

 

• Receiving

 

panel

 

 

 

 

 

 

 

 

(144 MHz band) 6

• Displayed frequency :

Top

 

Push and hold

 

 

145.000

MHz [EUR], [UK]

panel

 

the [SQL] key

 

 

146.000

MHz

 

 

 

 

 

[ITA], [AUS], [SEA], [USA-1]

 

 

 

Connect the SSG to the antenna connector and set as:

Level

: 0.5 µV*

 

(– 113 dBm)

Modulation

: 1 kHz

Deviation

: ± 3.5 kHz

Connect a terminator to the [SP] jack.

Receiving

7

• Set an SSG output level for the

SSG

Output level

0.28 µV – 0.89 µV

Verify

 

S-meter to S3.

 

 

(-118dBm-108 dBm)

 

 

• Receiving

 

 

 

 

 

 

 

 

 

 

8

• Increase an SSG output level.

Front

S-meter

Full scale

Verify

 

• Receiving

panel

 

 

 

*This output level of the standard signal generator (SSG) is indicated as SSG’s open circuit.

5 - 6

Page 20
Image 20
Motorola IC-T81A, IC-T81E service manual Meter, Ssg, Top Push and hold MHz band, 101 dBm, 113 dBm