Motorola ASTRO SPECTRA Service Manual

February 3, 2003 6881076C20-E
6-10 Radio Alignment Procedure: ASTRO Digital Spectra and Digital Spectra Plus Tuner Software
6.2.8 Bit Error Rate (BER) Performance Check
This check tests the Bit Error Rate (BER) of the radio’s receiver at a desired frequency.
Required equipment and software: R-2670 system analyzer, with P25 option; IBM PC-compatible
computer, RSS
In Generate mode, the R-2670 system analyzer modulates the RF carrier with a 1011Hz tone test
pattern to test the Unit Under Test (UUT) receiver. The test pattern received by the UUT is compared
in the UUT with a stored version of the test pattern to compute a BER.
1. Connect the RF Input port of the UUT to the RF IN/OUT port of the analyzer.
2. Set up the R-2670 as follows:
- Place the cursor in the RF Zone, and configure the analyzer as follows:
RF control: Generate
Preset: B/W: NB
Freq: Desired test frequency; for example, 851.0625MHz
Output Level: -50.0 dBm
Gen RF Out: RF I/O
- Place the cursor on the Mode field in the Display Zone.
- Select PROJECT 25 STD.
- Set the METER field to RF DISPLAY.
- Place the cursor on the CODE field in the Audio Zone.
- Select the 1011 Hz PAT softkey.
This generates a 1011Hz tone test pattern. If this pattern is received correctly by the UUT,
the measured BER should be zero.
- Set the deviation in the Audio Zone as PROJ25Dev: 2.83 kHz ~.
3. Using the RSS, configure the UUT as follows:
- In the RSS Main Menu, press F2 to select SERVICE: Alignment.
-Press F5 to select Performance Testing.
-Press F2 to select Bit Error Rate.
- Enter the desired test frequency in the Rx Frequency (MHz) field; for example,
851.0625MHz.
- Set the Modulation Type to 12.5 kHz/C4FM.
- Set the BER Integration Time (sec) to not less than 7.200.
-Press F6 (Start/Stop) to begin the test.
4. Monitor the radio’s received BER (%) results on the computer.
5. Reduce the analyzer output level to achieve a standard Bit Error Rate of 5%. The analyzer
RF output level should be within the SINAD specification of the UUT.
6.3 ASTRO Digital Spectra and Digital Spectra Plus Tuner Software
A personal computer (PC) and Tuner Software are required to align the radio. Please refer to the
CPS Programming Installation Guide (Motorola part number 6881095C44) for installation and setup
procedures for the software. To perform the alignment procedures, the radio must be connected to
the computer and to a universal test set, as shown in the following figure.

Motorola ASTRO SPECTRA Specifications

General

Frequency Range	136-174 MHz, 403-470 MHz
Number of Channels	Up to 255
Channel Spacing	12.5 kHz, 20 kHz, 25 kHz
Modulation	FM
Operating Temperature	-22°F to +140°F (-30°C to +60°C)