Chapter 5: Gtr 8000 Base Radio Optimization; Aligning The Internal Frequency Reference Oscillator - Motorola ASTRO 25 GTR 8000 Manual

MN003286A01-E

Chapter 5: GTR 8000 Base Radio Optimization

Chapter 5
GTR 8000 Base Radio Optimization
Your Motorola Solutions Field Representative or Motorola Solutions Support Center (SSC) can advise
you on optimization activities required for your system, if any. See
on page 219.
This chapter contains optimization procedures and recommended settings relating to GTR 8000 Base
Radio.
5.1

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.
NOTICE: 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.
156
Motorola Solutions Support Center