Battery Equalization; Astro Simulcast Alignment (Trunked Operation); Astro/Analog Simulcast Alignment (Conventional Operation); Carrier Squelch Alignment - Motorola ASTRO 25 GTR 8000 Manual

MN003286A01-E
Chapter 5: GTR 8000 Base Radio Optimization
5.2

Battery Equalization

Battery Equalization configures the power supply to set the proper charge and capacity for the storage
batteries connected to the base radio. Sites equipped with storage batteries that provide power in case
of primary power failure require that the battery cells be equalized periodically.
See "Base Radio Service Help → Service Screens → Alignment Screens" in the CSS Online Help
for the alignment procedures.
NOTICE: Some batteries do not require equalization. See the battery manufacturer
recommendations.
5.3

ASTRO Simulcast Alignment (Trunked Operation)

ASTRO ® 25 Simulcast Alignment is used to enter a Launch Time Offset value (range 0.0 to 1000.0
usec), store the value in the base radio, and initiate a simulcast test pattern.
See "Base Radio Service Help → Service Screens → Alignment Screens" in the CSS Online Help for
the alignment procedures.
5.4

ASTRO/Analog Simulcast Alignment (Conventional Operation)

In an ASTRO ® 25 simulcast subsystem, all station transmitters are synchronized to a 1 pulse per
second (1PPS) signal from a Global Navigation Satellite System (GNSS) receiver. The 1PPS signal
provides a common time reference for each of the transmitters. The ASTRO
arriving at the station transmitter includes timestamps that specify the transmit offset delay for the voice
and data transmissions.
The ASTRO ® /Analog Alignment screen allows adjustment of the overlap coverage areas, and to
specify a launch time offset value, with a 0.1 μs resolution. This value is added to the arriving launch
time value to provide an adjusted launch time. The specified ASTRO
delay value applies only to ASTRO
offset value is 0 (zero), causing no adjustment to the launch time specified by the arriving timestamp
value.
For Analog Simulcast, the Transmit Offset Delay merely delays the Analog Simulcast Audio to provide
the adjustment in the overlap coverage areas.
See "Base Radio Service Help → Service Screens → Alignment Screens" in the CSS Online Help
for the alignment procedures.
5.5

Carrier Squelch Alignment

A Carrier Squelch (CSQ) Alignment is typically performed at an RF level which corresponds to 12 dB
SINAD, or an RF level which corresponds to 20 dB quieting, or any other RF level selected.
The CSQ Alignment screen facilitates the measurement of 12 dB SINAD for the base radio under
testing by allowing the Rx Qualifiers to be set to Open. When the Rx Qualifiers are set to Open, receive
audio is gated to the WL2 wireline port or to the speaker, regardless of the RF input level. The
preferred SINAD measurement port is the WL2 wireline port; however, the speaker can also be used.
158
® 25 simulcast subsystems and is considered optional. The default
® 25 signaling information
®
25 simulcast transmit offset