Identifying Your Dvrs Model; Frequency Band Of Operation; Cross-Band; Figure 1 Cross-Band Full Duplex & Simplex Capable Dvrs - Conceptual Diagram - Futurecom DVRS User Manual

Identifying Your DVRS Model

Frequency Band of Operation

Depending on the frequency band of operation of the APX Series Mobile Subscriber Unit
(MSU) and DVR, the DVRS models are classified as follows:
•
In-Band – when the MSU and DVR operate in the same frequency band.
•
Cross-Band – when the MSU and DVR operate in two different frequency
bands.

Cross-Band

Cross-Band DVRS models do not include any filters on the MSU side since the MSU
and DVR are not intended to simultaneously operate in the same frequency band. In
single band MSU configurations the MSU and DVR operate in different frequency bands.
In dual band MSU configuration either the MSU & DVR operate in 3 different frequency
bands or one of the MSU frequency bands is locked out when DVR operation is enabled
as shown on Figure 1.
Figure 1 Cross-Band Full Duplex & Simplex Capable DVRS - Conceptual Diagram
The Cross-Band DVRS typically includes a duplexer which can accommodate full duplex
and simplex DVR operation as shown on Figure 1. The cross-band duplexer however
has a limited pass-band window and is tuned to the DVR frequencies provided on the
purchase order.
APX8500 may require interface kit. Please refer to the DVR/VRX1000 Ordering Guide.
As an option, a cross-band DVRS can be configured for simplex only operation as
shown on Figure 2. In this case the DVRS does not utilize any filters.
January 2019
8A083X30 Rev.11
APX Series P25 Interface
DVRS User's Guide
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