8G093X01 R5
VR Programming Guide
August 2022 Page 51 of 144
APX Series ‘DVRS Enabled’ PSUs
If Group Services support is required, the “Group Text Messaging Service” in the corresponding
conventional system screen must be set to ‘Full Decode’ to enable the Group Text Feature. To
enable the Group Alias Update feature, the PSU must have the ‘OTA Radio Alias Type’ set to
‘Decode Only’ in the corresponding conventional personality screen. ‘Selective Squelch’ needs to
be programmed (instead of the default ‘Normal Squelch’) if the PSU User want to receive only
Group Services for its selected Talkgoup.
If the APX ‘DVRS Enabled’ PSU needs to support say 10 TGs via the VR, then the PSU may be
programmed with a single Conventional Personality, which is using a Conventional System of
‘DVRS’ type. The Conventional Personality’s Frequency Option table will contain 10 entries, which
are strapped to desired TG IDs. The actual TG IDs are specified in the designated Astro Talkgroup
List, which is then linked to the Conventional Personality (‘Astro Talkgroup’ tab). The PSU
behavior, when switched to a VR channel, is specified by programming the desired features in
the corresponding Conventional System ‘DVRS’ Tab. Each Frequency option of the Conventional
Personality (using desired TG ID and a ‘DVRS’ type Conventional System) is then assigned to a
PSU mode in the Zone Channel Assignment listing. Alternatively, the PSU can be programmed
with just one (or a few TG IDs) and TG translation can be enabled in the VR so that the PSU TG
ID is always translated to the ID of the TG selected on the MSU Control Head.
Programming of Generic P25 PSU for Digital VR Mode
The programming of a Generic P25 PSU requires matched VR – PSU programming of:
• VR Tx and Rx Frequencies
• Tx and Rx NACs
In addition, the programmed PSU ASTRO Unit ID and selected TG ID must be valid and allowed
on the P25 system.
Programming of the P25 PSU (Generic P25 or ‘DVRS Enabled’) for operation on
Conventional P25 MSU System
Both PSU types must have the Tx and Rx NACs matched with those programmed in the VR. If
the P25 conventional system is not using dedicated TG IDs then all system radios transmit with
the default TG ID = 1.
When the XTS PSU is programmed as ‘DVRS Enabled’, and ‘Talkgroup’ is checked in the given
conventional personality, the PSU transmits with default TG ID = 2. When the system radios are
operating on a conventional P25 system, which is not using Talkgroups, all radios still transmit
with default TG ID = 1. Therefore, the ‘DVRS Enabled’ PSU programming may need to be
changed to TG ID=1 to match the rest of the system radios so that communications can be heard
between ‘DVRS Enabled’ PSUs and system PSUs. The Generic P25 PSU transmits with default
TG ID = 1 so it matches the rest of the system radios and its programming does not need to be
changed.
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