Motorola VRS750, Service Manual

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3
VRS Features
The VRS operates with the ASTRO mobile radio and contains the
following integrated features:
• Automatic, multiple-unit, priority-resolution algorithm.
• Portable priority interrupt (PPI) function.
• Conventional/trunked operation.
• Remote switch enable/disable capability for control charger
interface.
• Remote activation of emergency alarm feature.
• In-car monitor operation.
• VRS mobile access tones.
• Mobile radio transmitter steering of up to eight modes via Private-
Line
®
(PL) code transmission from the portable radio.
• TX PL generator.
• Base repeater operation for two-frequency, simplex, fixed-repeater
systems.
• Mobile audio repeat.
• Over-the-air interoperability with VRS-EP units.
All VRS features can be programmed in the field using ASTRO Spectra
mobile CPS. For more information, refer to “VRS750 Programming,”
in Chapter 2.
IMPORTANT NOTE: All ASTRO Spectra VRS systems with the
same VRS RF transmit/receive frequency
need to be CPS programmed identically
to ensure proper operation. Failure to do
so could result in erratic system operation.
The VRS does not have to be installed in the system for
programming—only the mobile radio is programmed. If the VRS is not
connected after programming the mobile system, an error message
“ERR 12/10” will be displayed on the control head.
Mutually-Exclusive
Features
The VRS IS NOT compatible with the following mobile radio features:
• W3 Control Head is not supported with VRS
• Flush-mounted control heads
• VSELP signaling type
• Data—VRS and data are not compatible on the same channel and
cannot be used simultaneously. VRS should never be activated on
a channel that has packet data enabled, and VRS mode steering
channels should not have packet data enabled.
• Scan
• Over-the-Air Rekeying (OTAR) Rekey Request