Motorola ASTRO Digital Spectra - Waveform W7: Receive Audio; Waveform W8: Transmit Audio

6881076C25-E September 5, 2008
Troubleshooting Waveforms: ASTRO Digital Spectra Waveforms 6-5
Waveform W7: Receive Audio
Waveform W8: Transmit Audio
103 Acquisitions
Tek stopped:
T
2
Ch2
1
3
4
M 200us Ch1 2.20 V
W7: Receive audio: Receiving
1KHz tone @ 3KHz deviation, -60dBm. Volume set to rated audio
.
Trace 1 - IRQB @ DSP (8KHz)
Trace 2 - SD0 @ C412 on Command Board
Trace 3 - SPKR_LOW Out of U450
Trace 4 - SPKR_HI Out of U450
Ch1 Freq
7.9118kH
z
Low sign
al
amplitude
5.00V
10.00V
500mV
10.00V
Ch1
Ch3
Note 3: Actual level is dependent upon volume setting.
MAEPF-26077-O
Ch4
3
T
T
T
507 Acquisitions
Tek stopped:
T
1
Ch4
T
2
3
4
M 200us Ch1 1.5 V
W8: Transmit Audio. 1KHz Tone
which provides 3KHz deviation.
Trace 1 - IRQB @ DSP (8KHz)
Trace 2 - MODIN
Trace 3 - MIC @ node P502/R415
Trace 4 - MAI @ U406
Ch1 Freq
7.9872kH
z
Low sign
al
amplitud
e
5.00V
300mV
MAEPF-26078-O
500mV
100mV
Ch1
Ch3
Ch2
T
T