AutoTune for Motorola APX Series Radios User Guide
6
4.2. Reference Frequency
RF Control Port
Frequency
Modulation Attenuation
Monitor
RF IN/OUT Test Frequency FM
30 dB
Table 4-3. Analyzer Configuration for Reference Frequency
4.2.1. Alignment
The radio is placed into Test Mode at the highest TX Test Frequency and commanded
to transmit. Using a best linear fit algorithm, two frequency error measurements are
taken at two different radio softpot values. These frequency error measurements are
used to calculate the softpot value which minimizes frequency error. After programming
this new softpot value into the radio, the radio softpot is fine tuned until minimum
frequency error is detected. The frequency error is compared against test limits and the
final results written to the log file.
Name
Description
Result
Pass or Fail. Frequency Error within Max Limit, Min Limit
Frequency
Test Frequency
Freq Error
Measured frequency error after alignment
Min Limit
Minimum Limit (inclusive) for frequency error
Max Limit
Maximum Limit (inclusive) for frequency error
Old Softpot Original radio softpot setting
New Softpot Radio softpot after alignment
Table 4-4. Reference Frequency alignment results
4.2.2. Test
The radio is placed into Test Mode at the highest TX Test Frequency and commanded
to transmit. The frequency error is measured by the analyzer and compared to test
limits. The final results are written to the log file.
Name
Description
Result
Pass or Fail. Frequency Error within Max Limit, Min Limit
Frequency
Test Frequency
Freq Error
Measured frequency error
Max Limit
Maximum Limit (inclusive) for frequency error
Min Limit
Minimum Limit (inclusive) for frequency error
Softpot
Radio softpot which yields Freq Error
Table 4-5. Reference Frequency test results
