User's Manual

Mutually-Exclusive Features
The VRS IS NOT compatible with the following mobile radio features:
o W3 Control Head is not supported with VRS
o VSELP signaling type
o 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.
o Scan
o Over-the-Air Rekeying (OTAR) Rekey Request
o Message (from the Control Head)-Trunking or Conventional
o Status (from the Control Head)-Trunking or Conventional
o Emergency Call-Trunking or Conventional-Emergency Call and VRS are
mutually exclusive. Even if the mobile is programmed for Alarm and Call,
when the Alarm case is exited, the mobile will not transition into
Emergency Call while the VRS is activated. Likewise, if the mobile is in
Emergency Call, the VRS cannot be activated. NOTE:When an
Emergency Alarm is received, the dispatcher may elevate that talkgroup to
Emergency status.
o Reprogram Request-Trunking
o Repeater Access Control-Conventional
o Mobile Single Tone-Conventional
o Seven-Tone Modat-Conventional
o Motorcycle
o Consolette (Digital Remote and Tone Remote)
The following mobile radio features may be received but may not be initiated
or responded to while VRS is enabled.
o Private Conversation -Trunking
o Call Alert-Trunking or Conventional
o Telephone Interconnect-Trunking or Conventional
o Voice Selective Call-Conventional
2. VRS Operation
General
The VRS is a crossband repeater that repeats either UHF or VHF portable transmissions
though a VHF, UHF, or 800MHz ASTRO mobile. The repeater cannot be operated with a
mobile radio operating in the same band as the VRS unit. In multiple-VRS sites, the VRS
uses a priority algorithm to prevent other VRS units from repeating. In this mode, only
the highest priority VRS will serve multiple portable users. This prevents interference
problems associated with multiple VRS units in proximity to one another.
Control Unit
The VRS may be enabled/disabled from the ASTRO mobile radio's remote-mounted W4,
W5, W7, or W9 control head (see Figure 1). The VRS button may occupy any of the