Motorola M3097 Service Manual download pdf (Page 50)

Motorola Confidential Proprietary

Test ProceduresService Manual

39

RX TEST

SINAD

dB

V

AC Level

8 22.25 24

0.6336

RF Gen Freq

MHz

879.990000

Amplitude

-116.0

dBm

-116.0

RF Out

Atten Hold

Output Port

RF Out

/ Dupl

On / Off

AF Gen1

Freq

1 . 0000

kHz

AF Gen1 To

FM

kHz

8.00

AF Gen2 Freq

1 . 0000

kHz

AF Gen2 To

FM

OFF

Filter 1

C message

Filter 2

15

kHz LPF

Ext

Load R

8 . 00

To Screen

RF GEN

RF ANL

AF ANL

SCOPE

SPEC ANL

ENCODER

DECODER

RADIO INT

More

RX Sensitivity Test (SINAD)

Communications Analyzer Setup:

• Select RX button from the Screen Con

trol panel

• Set RX frequency to 879.990 MHz

• Set Amplitude to -116 dBm

• Set AF gen1 to 1 kHz frequency at

8 kHz deviation, using FM modula

tion (PLEASE NOTE: this is for AMPS

only; NAMPS uses much lower devia

tion)

• Set AF Filter 1 set to C message fil

tering

• Set AF Filter 2 to 15 kHz

Test Mode Commands:

11333# Loads synthesizer to chan

nel 333

08# Unmute receive audio path

58# Turn on compandor

474# Set volume control to level 4

356# Set RX audio path to Ext. Au

dio Path

Sinad measured on the communica-

tions analyzer must be between

13dB - 35dB.

Duplex SINAD can be measured with the

same setup by entering 122# and the 05#

test command, which turns on the trans-

mitter at power step 2. Narrow band

SINAD can be measured by entering

571# and setting the FM Deviation to

3kHz. Refer to the RX troubleshooting

section for radios not within the pass

specifications.

Figure 22. RX Test Screen

RX Sensitivity Test (SINAD)

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 132 133

Comments to this Manuals

No comments