User's Manual

Chapter
5
GTR 8000 Base Radio Optimization
Your Motorola Field Representative or Motorola Solution Support Center (SSC) can advise you on optimization
activities required for your system, if any. See Motorola Solution Support Center on page 211.
This chapter contains optimization procedures and recommended settings relating to GTR 8000 Base Radio.
Aligning the Internal Frequency Reference Oscillator
The transceiver option card within a base radio provides an internal 10 MHz frequency reference which can be used
as the primary or backup frequency reference source for the device. For conventional base radio operation, it also
provides the analog interfaces and wildcard I/Os.
After a base radio is installed or after the transceiver option card is replaced, align the internal frequency reference
oscillator.
Align the transceiver option card internal frequency reference oscillator to within 1 ppb (parts per billion). The
measuring equipment used to make this alignment must be accurate to within 1 ppb. This accuracy typically requires
test equipment with a double oven or a Rubidium reference oscillator.
Note: The base radio must be turned on for at least one week before the internal frequency reference
oscillator is aligned.
Align the internal frequency reference oscillator for an Oven Controlled Crystal Oscillator (OCXO) transceiver option
card:
• Upon installation of the base radio for all bands.
• Once every two years after installation for 700/800 MHz systems.
• Once every five years after installation for UHF systems.
• VHF systems do not require alignment after initial installation.
Align the internal frequency reference oscillator for a Temperature Compensated Crystal Oscillator (TCXO)
transceiver option card:
• Upon installation of the base radio for UHF.
•
Every year after installation for UHF.
The internal frequency reference oscillator can be aligned using two methods: manual alignment or auto alignment.
See “Base Radio Service Help → Service Screens → Alignment Screens” in the CSS Online Help for the alignment
procedures.
GTR 8000 Base Radio Time and Frequency Inputs
Various external time and frequency inputs can be provided to the base radio for normal operation or for Internal
Frequency Reference Oscillator alignment. The following table provides a list of acceptable input signal types and
levels for each input port.
6871024P71-A | November 2013 |
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Applicant: Motorola Solutions
Equipment Type: ABZ89FC5810B / 109AB-5810B
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