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Service Manual
TX Frequency Error Test
Figure 24. TX Test Screen
TX Frequency
MHZ
834.9900
Tx Power
dBm
27.49
Input Port
Tune Mode
RF In / Ant
Auto / Manual
Tune Freq
If Filter
230 KHz
834.990000
MHz
Ext TX Key
Tx Pwr Zero
On / Off
Zero
Test Mode Commands:
11333#
Loads synthesizer to channel
333
122#
Set power level to step 2
05#
Turn on transmit carrier
The frequency error measured on
the communications analyzer must
be less than
± 0.5 ppm
TX TEST
FM Deviation
dB
11.58
AF Freq
1.00000
AF Gen 1 Freq
AF Anl In
FM Demod
1.0000
KHz
Filter 1
AF Gen 1 Lvl
50 Hz HPF
6.00
Filter 2
V
15 KHz LPF
De-Emphasis
750 us / Off
Detector
Pk +- Max
.
Motorola Confidential Proprietary
Communications Analyzer Setup:
KHz
• Select TX button from the Screen
Control panel
KHz
• PWR is measured in dBm
• Set Frequency Measurement to auto
or manual (display will show TX Freq.
To Screen
Error)
RF GEN
RF ANL
AF ANL
• Set TX frequency to 834.990 MHz
SCOPE
SPEC ANL
• Set IF filter to 230 kHz
ENCODER
DECODER
RADIO INT
• Set AF Filter 1 to 50 Hz
• Set AF Filter 2 to 15 kHz
More
• Set AF gen1 for 1 kHz frequency at
6V level (output will go to the audio
port)
Test Procedures
TX Frequency Error Test
41
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