9-4 GENERAL OPERATION
The display screen is divided into three major
zones, The Display Zone, the RF Zone, and the
Audio Zone. The top portion of display zone
displays the status and selections for the current
test sequence. The bottom portion of the Display
Zone displays the data about the radio under test.
The RF Zone is used for the selection of trunking
frequency bands, for control and voice channels,
and port selections. The Audio Zone is modified
during Astro testing to allow setting the loudness
of the radio under test, as well as the deviation
settings for a fixed 1 kHz tone and/or an external
(microphone or BNC) input.
A status thermometer is displayed in the Display
Zone during the performance of the test. Ap-
pendix I identifies all of the signaling events
identified in the status thermometer display.
9-4.1 Access to Standard System Test Screens
During Trunking Testing
The analyzer must remain in the main trunking
test screen during the initial call processing se-
quence. Once this has been completed and the
radio under test is on the voice channel, other
standard system screens may be entered from the
"Meter:" position of the Display zone. Simply
press the more softkey to cycle through the
available menus and make the selection accord-
ingly. To end the test, it is necessary to return to
the trunking test screen from which the test was
initiated.
9-4.2 Spectrum Analyzer Dispersion Limit
While in Tr
unked Test Mode
While the trunked test mode is active, the
spectrum analyzer maximum dispersion is limited
to 1 MHz per division. To use the higher
dispersion selections of 2, 5 and 10 MHz per
division, it is necessary to set the "mode:" field of
the Display zone to STANDARD.
9-4.3 Remote Operation
All R2600 Series Communications System
Ana-
lyzers are equipped with a standard RS-232 inter-
face. Optionally, the R2670 is equipped with an
IEEE 488 (HP-IB / GPIB) interface. Either of
these interfaces may be used to remotely control
the analyzer using a set of commands, queries,
and responses that are defined in the General
Dynamics Communications System Analyzer
Programming Reference Manual (68-
P80309F55). Tabbed sections for Motorola
Analog Trunking and Astro Trunking define
trunking-specific commands and queries.
138
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